$ALLY
Ally Financial Inc. Stock $ally

$ally Overview Financials Valuation SEC Filings Company Website

2017 Q4 Form 10-K Financial Statement

#000004072918000035 Filed on February 21, 2018

Income Statement

Concept	2017 Q4	2017	2016 Q4
Revenue	$1.473B	$5.765B	$1.368B
YoY Change	7.68%	6.03%	2.17%
Cost Of Revenue		$332.0M
YoY Change		-2.92%
Gross Profit		$5.433B
YoY Change		6.63%
Gross Profit Margin		94.24%
Selling, General & Admin
YoY Change
% of Gross Profit
Research & Development		$284.0M
YoY Change		3.65%
% of Gross Profit		5.23%
Depreciation & Amortization	$425.0M	$1.859B	$575.0M
YoY Change	-26.09%	-21.96%	-14.31%
% of Gross Profit		34.22%
Operating Expenses		$284.0M
YoY Change		3.65%
Operating Profit		$5.149B
YoY Change		6.8%
Interest Expense		$2.857B
YoY Change		8.67%
% of Operating Profit		55.49%
Other Income/Expense, Net	$379.0M	$1.544B	$392.0M
YoY Change	-3.32%	0.92%	10.11%
Pretax Income	$410.0M	$1.507B	$380.0M
YoY Change	7.89%	-4.68%	-11.83%
Income Tax	$231.0M	$581.0M	$134.0M
% Of Pretax Income	56.34%	38.55%	35.26%
Net Earnings	$181.0M	$929.0M	$248.0M
YoY Change	-27.02%	-12.93%	-5.7%
Net Earnings / Revenue	12.29%	16.11%	18.13%
Basic Earnings Per Share	$0.41	$2.05	$0.53
Diluted Earnings Per Share	$0.41	$2.04	$0.52
COMMON SHARES
Basic Shares Outstanding	442.2M shares	453.7M shares	471.6M shares
Diluted Shares Outstanding		455.4M shares

Balance Sheet

Concept	2017 Q4	2017	2016 Q4
SHORT-TERM ASSETS
Cash & Short-Term Investments
YoY Change
Cash & Equivalents	$4.252B		$5.934B
Short-Term Investments
Other Short-Term Assets
YoY Change
Inventory
Prepaid Expenses
Receivables
Other Receivables
Total Short-Term Assets
YoY Change
LONG-TERM ASSETS
Property, Plant & Equipment	$456.0M	$9.197B	$376.0M
YoY Change	21.28%	-22.36%	60.0%
Goodwill	$240.0M		$240.0M
YoY Change	0.0%		788.89%
Intangibles
YoY Change
Long-Term Investments	$220.0M	$220.0M
YoY Change
Other Assets	$461.0M	$461.0M	$994.0M
YoY Change	-53.62%	-53.62%	-27.39%
Total Long-Term Assets
YoY Change
TOTAL ASSETS
Total Short-Term Assets
Total Long-Term Assets
Total Assets	$167.1B	$167.1B	$163.7B
YoY Change	2.09%	2.09%	3.25%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$1.121B	$1.121B	$1.000B
YoY Change	12.1%	12.1%	34.95%
Accrued Expenses	$437.0M	$437.0M	$447.0M
YoY Change	-2.24%	-2.24%	-40.08%
Deferred Revenue
YoY Change
Short-Term Debt	$11.41B	$4.063B	$12.67B
YoY Change	-9.94%	-15.32%	56.44%
Long-Term Debt Due	$11.04B		$14.55B
YoY Change	-24.16%		29.29%
Total Short-Term Liabilities	$1.558B	$1.558B	$1.447B
YoY Change	7.67%	7.67%	-2.69%
LONG-TERM LIABILITIES
Long-Term Debt	$33.19B	$44.23B	$39.26B
YoY Change	-15.46%	-18.29%	-28.16%
Other Long-Term Liabilities	$3.201B	$3.201B	$3.141B
YoY Change	1.91%	1.91%	10.52%
Total Long-Term Liabilities	$33.19B	$47.43B	$39.26B
YoY Change	-15.46%	-17.19%	-28.16%
TOTAL LIABILITIES
Total Short-Term Liabilities	$1.558B	$1.558B	$1.447B
Total Long-Term Liabilities	$33.19B	$47.43B	$39.26B
Total Liabilities	$153.7B	$153.7B	$150.4B
YoY Change	2.16%	2.16%	3.63%
SHAREHOLDERS EQUITY
Retained Earnings	-$6.406B		-$7.151B
YoY Change	-10.42%		-11.82%
Common Stock
YoY Change
Preferred Stock
YoY Change
Treasury Stock (at cost)	$1.110B		$357.0M
YoY Change	210.92%		2131.25%
Treasury Stock Shares	52.83M shares		18.71M shares
Shareholders Equity	$13.49B	$13.49B	$13.32B
YoY Change
Total Liabilities & Shareholders Equity	$167.1B	$167.1B	$163.7B
YoY Change	2.09%	2.09%	3.25%

Cashflow Statement

Concept	2017 Q4	2017	2016 Q4
OPERATING ACTIVITIES
Net Income	$181.0M	$929.0M	$248.0M
YoY Change	-27.02%	-12.93%	-5.7%
Depreciation, Depletion And Amortization	$425.0M	$1.859B	$575.0M
YoY Change	-26.09%	-21.96%	-14.31%
Cash From Operating Activities	$706.0M	$4.079B	$978.0M
YoY Change	-27.81%	-10.69%	-14.29%
INVESTING ACTIVITIES
Capital Expenditures	-$1.208B	-$4.052B	-$914.0M
YoY Change	32.17%	23.76%	-27.58%
Acquisitions		$0.00
YoY Change
Other Investing Activities	-$3.357B	$219.0M	-$5.375B
YoY Change	-37.54%	-28.43%	212.14%
Cash From Investing Activities	-$4.565B	-$8.727B	-$6.289B
YoY Change	-27.41%	-3.78%	110.76%
FINANCING ACTIVITIES
Cash Dividend Paid		$184.0M
YoY Change		70.37%
Common Stock Issuance & Retirement, Net		$753.0M
YoY Change		120.82%
Debt Paid & Issued, Net		$27.91B
YoY Change		5.66%
Cash From Financing Activities	3.250B	$2.033B	6.571B
YoY Change	-50.54%	-44.6%	139.73%
NET CHANGE
Cash From Operating Activities	706.0M	$4.079B	978.0M
Cash From Investing Activities	-4.565B	-$8.727B	-6.289B
Cash From Financing Activities	3.250B	$2.033B	6.571B
Net Change In Cash	-609.0M	-$2.612B	1.260B
YoY Change	-148.33%	213.94%	40.31%
FREE CASH FLOW
Cash From Operating Activities	$706.0M	$4.079B	$978.0M
Capital Expenditures	-$1.208B	-$4.052B	-$914.0M
Free Cash Flow	$1.914B	$8.131B	$1.892B
YoY Change	1.16%	3.7%	-21.27%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
CY2017Q4	ally	Allyhastherighttodeferpaymentsofinterestforaperiodnotexceedingconsecutivequartersof Allyhastherighttodeferpaymentsofinterestforaperiodnotexceedingconsecutivequartersof	20
CY2017Q4	ally	Assets Greater Than50 Billion AssetsGreaterThan50Billion	50000000000	USD
CY2017Q4	ally	Cash And Securities Collateral Placed With Counterparties CashAndSecuritiesCollateralPlacedWithCounterparties	29000000	USD
CY2016Q4	ally	Assets Of Nonconsolidated Variable Interest Entities AssetsOfNonconsolidatedVariableInterestEntities	2899000000	USD
CY2017Q4	ally	Assets Of Nonconsolidated Variable Interest Entities AssetsOfNonconsolidatedVariableInterestEntities	1964000000	USD
CY2016Q4	ally	Available For Sale Equity Investment In Any One Industry Did Not Exceed Percentage AvailableForSaleEquityInvestmentInAnyOneIndustryDidNotExceedPercentage	0.14
CY2017Q4	ally	Available For Sale Equity Investment In Any One Industry Did Not Exceed Percentage AvailableForSaleEquityInvestmentInAnyOneIndustryDidNotExceedPercentage	0.14
CY2015	ally	Availableforsale Securities Gross Realized Gain Loss Excluding Otti Including Disc Ops AvailableforsaleSecuritiesGrossRealizedGainLossExcludingOttiIncludingDiscOps	-155000000	USD
CY2016	ally	Availableforsale Securities Gross Realized Gain Loss Excluding Otti Including Disc Ops AvailableforsaleSecuritiesGrossRealizedGainLossExcludingOttiIncludingDiscOps	-185000000	USD
CY2017	ally	Availableforsale Securities Gross Realized Gain Loss Excluding Otti Including Disc Ops AvailableforsaleSecuritiesGrossRealizedGainLossExcludingOttiIncludingDiscOps	-102000000	USD
CY2016Q2	ally	Business Acquisition Cash Paid BusinessAcquisitionCashPaid	298000000	USD
CY2016Q3	ally	Business Acquisition Cash Paid BusinessAcquisitionCashPaid	28000000	USD
CY2015	ally	Capital Contributions From Parent CapitalContributionsFromParent	0	USD
CY2016	ally	Capital Contributions From Parent CapitalContributionsFromParent	0	USD
CY2017	ally	Capital Contributions From Parent CapitalContributionsFromParent	0	USD
CY2017Q4	ally	Capital Loss Carryforwards Valuation Allowance CapitalLossCarryforwardsValuationAllowance	2000000	USD
CY2016Q4	ally	Carryingvalueofassetsfor Vi Esforwhichwehavecontinuinginvolvement CarryingvalueofassetsforVIEsforwhichwehavecontinuinginvolvement	37631000000	USD
CY2017Q4	ally	Carryingvalueofassetsfor Vi Esforwhichwehavecontinuinginvolvement CarryingvalueofassetsforVIEsforwhichwehavecontinuinginvolvement	30776000000	USD
CY2016Q4	ally	Carryingvalueofliabilitiesfor Vi Esforwhichwehavecontinuinginvolvement CarryingvalueofliabilitiesforVIEsforwhichwehavecontinuinginvolvement	13490000000	USD
CY2017Q4	ally	Carryingvalueofliabilitiesfor Vi Esforwhichwehavecontinuinginvolvement CarryingvalueofliabilitiesforVIEsforwhichwehavecontinuinginvolvement	10483000000	USD
CY2016Q4	ally	Cash And Securities Collateral Placed With Counterparties CashAndSecuritiesCollateralPlacedWithCounterparties	167000000	USD
CY2016Q4	ally	Cash Collateral Placedwith Counterparties Excluding Cash Collateral Associatedwith Repurchase Agreements CashCollateralPlacedwithCounterpartiesExcludingCashCollateralAssociatedwithRepurchaseAgreements	122000000	USD
CY2017Q4	ally	Cash Collateral Placedwith Counterparties Excluding Cash Collateral Associatedwith Repurchase Agreements CashCollateralPlacedwithCounterpartiesExcludingCashCollateralAssociatedwithRepurchaseAgreements	20000000	USD
CY2016Q4	ally	Cash Collateral Received From Counterparties CashCollateralReceivedFromCounterparties	10000000	USD
CY2017Q4	ally	Cash Collateral Received From Counterparties CashCollateralReceivedFromCounterparties	17000000	USD
CY2016Q4	ally	Cash Collateral Receivedfrom Counterparties Excluding Collateral Associatedwith Repurchase Agreements CashCollateralReceivedfromCounterpartiesExcludingCollateralAssociatedwithRepurchaseAgreements	10000000	USD
CY2017Q4	ally	Cash Collateral Receivedfrom Counterparties Excluding Collateral Associatedwith Repurchase Agreements CashCollateralReceivedfromCounterpartiesExcludingCollateralAssociatedwithRepurchaseAgreements	17000000	USD
CY2016Q4	ally	Cash Reserve Deposits Held For Securitization Trusts CashReserveDepositsHeldForSecuritizationTrusts	184000000	USD
CY2017Q4	ally	Cash Reserve Deposits Held For Securitization Trusts CashReserveDepositsHeldForSecuritizationTrusts	111000000	USD
CY2016Q4	ally	Commercial Concentration Risk CommercialConcentrationRisk	1.000
CY2017Q4	ally	Commercial Concentration Risk CommercialConcentrationRisk	1.000
CY2016Q4	ally	Commercial Criticized Finance Receivablesand Loans CommercialCriticizedFinanceReceivablesandLoans	1.000	USD
CY2017Q4	ally	Commercial Criticized Finance Receivablesand Loans CommercialCriticizedFinanceReceivablesandLoans	1.000	USD
CY2016Q4	ally	Commitmentstoprovidecapitaltoinvestees Commitmentstoprovidecapitaltoinvestees	206000000	USD
CY2017Q4	ally	Commitmentstoprovidecapitaltoinvestees Commitmentstoprovidecapitaltoinvestees	283000000	USD
CY2016Q4	ally	Commitmenttofundremainingunusedbalancesonhomeequitylinesofcredit Commitmenttofundremainingunusedbalancesonhomeequitylinesofcredit	356000000	USD
CY2017Q4	ally	Commitmenttofundremainingunusedbalancesonhomeequitylinesofcredit Commitmenttofundremainingunusedbalancesonhomeequitylinesofcredit	318000000	USD
CY2017Q4	ally	Common Equity Tier1 Capital Requiredfor Capital Adequacyto Riskweighted Assets CommonEquityTier1CapitalRequiredforCapitalAdequacytoRiskweightedAssets	0.045
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CY2016Q4	ally	Dealer Deposits DealerDeposits	167000000	USD
CY2017Q4	ally	Dealer Deposits DealerDeposits	12000000	USD
CY2016Q4	ally	Debt Payable To Bank Subsidiaries DebtPayableToBankSubsidiaries	0	USD
CY2017Q4	ally	Debt Payable To Bank Subsidiaries DebtPayableToBankSubsidiaries	0	USD
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CY2017Q4	ally	Debt Payable To Nonbank Subsidiaries DebtPayableToNonbankSubsidiaries	0	USD
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CY2017Q4	ally	Demand Notes DemandNotes	3171000000	USD
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CY2017	ally	Depreciation Expense On Operating Lease Assets DepreciationExpenseOnOperatingLeaseAssets	1368000000	USD
CY2016Q4	ally	Derivative Instrument Converting Fixed Rated Debtinto Variable Rate Debt DerivativeInstrumentConvertingFixedRatedDebtintoVariableRateDebt	2100000000	USD
CY2017Q4	ally	Derivative Instrument Converting Fixed Rated Debtinto Variable Rate Debt DerivativeInstrumentConvertingFixedRatedDebtintoVariableRateDebt	3800000000	USD
CY2016Q4	ally	Derivative Instrument Converting Variable Ratedebtinto Fixed Rate DerivativeInstrumentConvertingVariableRatedebtintoFixedRate	132000000	USD
CY2017Q4	ally	Derivative Instrument Converting Variable Ratedebtinto Fixed Rate DerivativeInstrumentConvertingVariableRatedebtintoFixedRate	3400000000	USD
CY2015	ally	Disposals Of Operating Lease Assets DisposalsOfOperatingLeaseAssets	5546000000	USD
CY2016	ally	Disposals Of Operating Lease Assets DisposalsOfOperatingLeaseAssets	6304000000	USD
CY2017	ally	Disposals Of Operating Lease Assets DisposalsOfOperatingLeaseAssets	5567000000	USD
CY2015	ally	Dividends From Non Bank Subsidiary DividendsFromNonBankSubsidiary	0	USD
CY2016	ally	Dividends From Non Bank Subsidiary DividendsFromNonBankSubsidiary	0	USD
CY2017	ally	Dividends From Non Bank Subsidiary DividendsFromNonBankSubsidiary	0	USD
CY2015	ally	Dividends Paid And Returns Of Contributed Capital Intercompany DividendsPaidAndReturnsOfContributedCapitalIntercompany	0	USD
CY2016	ally	Dividends Paid And Returns Of Contributed Capital Intercompany DividendsPaidAndReturnsOfContributedCapitalIntercompany	0	USD
CY2017	ally	Dividends Paid And Returns Of Contributed Capital Intercompany DividendsPaidAndReturnsOfContributedCapitalIntercompany	0	USD
CY2015	ally	Dividendsfrom Bank Subsidiary DividendsfromBankSubsidiary	0	USD
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CY2015	ally	Effective Income Tax Rate Reconciliation Changein Unrecognized Tax Benefits EffectiveIncomeTaxRateReconciliationChangeinUnrecognizedTaxBenefits	-5000000	USD
CY2016	ally	Effective Income Tax Rate Reconciliation Changein Unrecognized Tax Benefits EffectiveIncomeTaxRateReconciliationChangeinUnrecognizedTaxBenefits	-161000000	USD
CY2017	ally	Effective Income Tax Rate Reconciliation Changein Unrecognized Tax Benefits EffectiveIncomeTaxRateReconciliationChangeinUnrecognizedTaxBenefits	1000000	USD
CY2016Q2	ally	Frb Approved Capital Action Dividends FRBApprovedCapitalActionDividends	0.08
CY2017Q2	ally	Frb Approved Capital Action Dividends FRBApprovedCapitalActionDividends	0.12
CY2016Q4	ally	Frb Required Reserve Balance FRBRequiredReserveBalance	149000000	USD
CY2017Q4	ally	Frb Required Reserve Balance FRBRequiredReserveBalance	370000000	USD
CY2016	ally	Financing Receivable Significant Salesand Transfers FinancingReceivableSignificantSalesandTransfers	4311000000	USD
CY2017	ally	Financing Receivable Significant Salesand Transfers FinancingReceivableSignificantSalesandTransfers	1348000000	USD
CY2017Q4	ally	Fromandincluding February152016tobutexcluding February152040distributionswillbepayableatanannualrateequaltothreemonth Londoninterbankofferrateplus FromandincludingFebruary152016tobutexcludingFebruary152040distributionswillbepayableatanannualrateequaltothreemonthLondoninterbankofferrateplus	0.0579
CY2015	ally	Gain Loss On Sales Of Loans Net Including Discontinued Operations GainLossOnSalesOfLoansNetIncludingDiscontinuedOperations	45000000	USD
CY2016	ally	Gain Loss On Sales Of Loans Net Including Discontinued Operations GainLossOnSalesOfLoansNetIncludingDiscontinuedOperations	11000000	USD
CY2017	ally	Gain Loss On Sales Of Loans Net Including Discontinued Operations GainLossOnSalesOfLoansNetIncludingDiscontinuedOperations	68000000	USD
CY2015	ally	Gross Remarketing Gains Losses GrossRemarketingGainsLosses	351000000	USD
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CY2017	ally	Gross Remarketing Gains Losses GrossRemarketingGainsLosses	124000000	USD
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CY2016Q4	ally	Heldto Maturity Debt Securities Yield HeldtoMaturityDebtSecuritiesYield	0.029
CY2016Q4	ally	Heldto Maturity Securities Due After Ten Years Yield HeldtoMaturitySecuritiesDueAfterTenYearsYield	0.029
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CY2015	ally	Lease And Loan Administration LeaseAndLoanAdministration	126000000	USD
CY2017	ally	Maximumrangefor Ps Uawardspayableuponvest MaximumrangeforPSUawardspayableuponvest	1.50
CY2016	ally	Lease And Loan Administration LeaseAndLoanAdministration	136000000	USD
CY2017	ally	Lease And Loan Administration LeaseAndLoanAdministration	159000000	USD
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CY2016Q4	ally	Identifiable Assets IdentifiableAssets	163488000000	USD
CY2017Q4	ally	Identifiable Assets IdentifiableAssets	166908000000	USD
CY2017Q4	ally	Increase Decreasein Dividends Payable IncreaseDecreaseinDividendsPayable	0.50
CY2017Q4	ally	Increase Decreasein Dividends Payablepershare IncreaseDecreaseinDividendsPayablepershare	0.01
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CY2015	ally	Increase Decreasein Nonmarketableequitysecurities IncreaseDecreaseinNonmarketableequitysecurities	147000000	USD
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CY2017	ally	Increase Decreasein Nonmarketableequitysecurities IncreaseDecreaseinNonmarketableequitysecurities	187000000	USD
CY2017Q4	ally	Increasedecreaseinsharerepurchaseprogram Increasedecreaseinsharerepurchaseprogram	0.09
CY2017Q4	ally	Increasein Minimum Capital Conservation Buffer IncreaseinMinimumCapitalConservationBuffer	0.03
CY2015	ally	Interest And Dividends Exempt From Us Federal Income Tax InterestAndDividendsExemptFromUSFederalIncomeTax	18000000	USD
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CY2017	ally	Interest And Dividends Exempt From Us Federal Income Tax InterestAndDividendsExemptFromUSFederalIncomeTax	22000000	USD
CY2016Q4	ally	Investment In Bank Subsidiaries InvestmentInBankSubsidiaries	0	USD
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CY2016Q4	ally	Investment In Nonbank Subsidiaries InvestmentInNonbankSubsidiaries	0	USD
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CY2016Q4	ally	Loans And Leases Receivable From Bank Subsidiary LoansAndLeasesReceivableFromBankSubsidiary	0	USD
CY2016Q4	ally	Loans And Leases Receivable From Nonbank Subsidiary LoansAndLeasesReceivableFromNonbankSubsidiary	0	USD
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CY2016Q4	ally	Mortgageloanoriginationcommitments Mortgageloanoriginationcommitments	0	USD
CY2017Q4	ally	Mortgageloanoriginationcommitments Mortgageloanoriginationcommitments	95000000	USD
CY2015	ally	Net Change In Debt Intercompany NetChangeInDebtIntercompany	0	USD
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CY2017	ally	Net Change In Debt Intercompany NetChangeInDebtIntercompany	0	USD
CY2017Q4	ally	Net Deferred Tax Assets Capital Loss Carryforwards NetDeferredTaxAssetsCapitalLossCarryforwards	0	USD
CY2017Q4	ally	Net Deferred Tax Assets Operating Loss Carryforwards NetDeferredTaxAssetsOperatingLossCarryforwards	302000000	USD
CY2017Q4	ally	Net Deferred Tax Assets Other Non Attribute NetDeferredTaxAssetsOtherNonAttribute	-986000000	USD
CY2017Q4	ally	Net Deferred Tax Assets Stateand Local Tax Carryforwards NetDeferredTaxAssetsStateandLocalTaxCarryforwards	420000000	USD
CY2017Q4	ally	Net Deferred Tax Assets Tax Credit Carryforwards NetDeferredTaxAssetsTaxCreditCarryforwards	1019000000	USD
CY2015	ally	Net Financing Revenue NetFinancingRevenue	3719000000	USD
CY2016Q1	ally	Net Financing Revenue NetFinancingRevenue	951000000	USD
CY2016Q2	ally	Net Financing Revenue NetFinancingRevenue	984000000	USD
CY2016Q3	ally	Net Financing Revenue NetFinancingRevenue	996000000	USD
CY2016Q4	ally	Net Financing Revenue NetFinancingRevenue	976000000	USD
CY2016	ally	Net Financing Revenue NetFinancingRevenue	3907000000	USD
CY2017Q1	ally	Net Financing Revenue NetFinancingRevenue	979000000	USD
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CY2017Q3	ally	Net Financing Revenue NetFinancingRevenue	1081000000	USD
CY2017Q4	ally	Net Financing Revenue NetFinancingRevenue	1094000000	USD
CY2017	ally	Net Financing Revenue NetFinancingRevenue	4221000000	USD
CY2016Q4	ally	Noncashcollateralreceived Noncashcollateralreceived	6000000	USD
CY2017Q4	ally	Noncashcollateralreceived Noncashcollateralreceived	2000000	USD
CY2016Q4	ally	Nonderivative Cash Collateral Placedwith Counterparties Associatedwiththe Repurchase Agreements NonderivativeCashCollateralPlacedwithCounterpartiesAssociatedwiththeRepurchaseAgreements	45000000	USD
CY2017Q4	ally	Nonderivative Cash Collateral Placedwith Counterparties Associatedwiththe Repurchase Agreements NonderivativeCashCollateralPlacedwithCounterpartiesAssociatedwiththeRepurchaseAgreements	10000000	USD
CY2017Q4	ally	Nonderivative Cash Collateralreceivedfromcounterpartiesassociatedwith Repurchase Agreements NonderivativeCashCollateralreceivedfromcounterpartiesassociatedwithRepurchaseAgreements	1000000	USD
CY2016Q4	ally	Nonmarketableequitysecurities Nonmarketableequitysecurities	1046000000	USD
CY2017Q4	ally	Nonmarketableequitysecurities Nonmarketableequitysecurities	1233000000	USD
CY2015	ally	Originationsandrepaymentsofloansheldforinvestmentandother Originationsandrepaymentsofloansheldforinvestmentandother	9344000000	USD
CY2016	ally	Originationsandrepaymentsofloansheldforinvestmentandother Originationsandrepaymentsofloansheldforinvestmentandother	8826000000	USD
CY2017	ally	Originationsandrepaymentsofloansheldforinvestmentandother Originationsandrepaymentsofloansheldforinvestmentandother	1063000000	USD
CY2015	ally	Other Comprehensive Income Loss Foreign Currency Transactionand Translation Adjustmentbefore Taxandreclassificationadjustments OtherComprehensiveIncomeLossForeignCurrencyTransactionandTranslationAdjustmentbeforeTaxandreclassificationadjustments	-39000000	USD
CY2016	ally	Other Comprehensive Income Loss Foreign Currency Transactionand Translation Adjustmentbefore Taxandreclassificationadjustments OtherComprehensiveIncomeLossForeignCurrencyTransactionandTranslationAdjustmentbeforeTaxandreclassificationadjustments	5000000	USD
CY2015	ally	Other Comprehensive Income Loss Foreign Currency Transactionand Translation Gain Loss Arising During Periodbeforereclassificationadjustments Netof Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionandTranslationGainLossArisingDuringPeriodbeforereclassificationadjustmentsNetofTax	-26000000	USD
CY2016	ally	Other Comprehensive Income Loss Foreign Currency Transactionand Translation Gain Loss Arising During Periodbeforereclassificationadjustments Netof Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionandTranslationGainLossArisingDuringPeriodbeforereclassificationadjustmentsNetofTax	3000000	USD
CY2017	ally	Other Comprehensive Income Loss Foreign Currency Transactionand Translation Gain Loss Arising During Periodbeforereclassificationadjustments Netof Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionandTranslationGainLossArisingDuringPeriodbeforereclassificationadjustmentsNetofTax	8000000	USD
CY2015	ally	Other Comprehensive Income Loss Foreign Currency Translation Adjustmentbeforereclassificationadjustments Tax OtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentbeforereclassificationadjustmentsTax	-13000000	USD
CY2016	ally	Other Comprehensive Income Loss Foreign Currency Translation Adjustmentbeforereclassificationadjustments Tax OtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentbeforereclassificationadjustmentsTax	2000000	USD
CY2015	ally	Other Comprehensive Income Loss Foreign Currency Translation Adjustmentsand Net Investment Hedges Netof Tax OtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentsandNetInvestmentHedgesNetofTax	-27000000	USD
CY2016	ally	Other Comprehensive Income Loss Foreign Currency Translation Adjustmentsand Net Investment Hedges Netof Tax OtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentsandNetInvestmentHedgesNetofTax	5000000	USD
CY2017	ally	Other Comprehensive Income Loss Foreign Currency Translation Adjustmentsand Net Investment Hedges Netof Tax OtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentsandNetInvestmentHedgesNetofTax	2000000	USD
CY2015	ally	Other Comprehensive Income Loss Net Investment Hedges Netof Tax OtherComprehensiveIncomeLossNetInvestmentHedgesNetofTax	21000000	USD
CY2016	ally	Other Comprehensive Income Loss Net Investment Hedges Netof Tax OtherComprehensiveIncomeLossNetInvestmentHedgesNetofTax	1000000	USD
CY2017	ally	Other Comprehensive Income Loss Net Investment Hedges Netof Tax OtherComprehensiveIncomeLossNetInvestmentHedgesNetofTax	-6000000	USD
CY2015	ally	Other Comprehensive Income Loss Net Investment Hedges Tax OtherComprehensiveIncomeLossNetInvestmentHedgesTax	12000000	USD
CY2015	ally	Other Comprehensive Income Loss Net Investment Hedgesbefore Tax OtherComprehensiveIncomeLossNetInvestmentHedgesbeforeTax	33000000	USD
CY2015	ally	Other Comprehensive Income Loss Reclassification Adjustment For Net Investment Hedges Included In Net Income Discontinued Operation Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentForNetInvestmentHedgesIncludedInNetIncomeDiscontinuedOperationBeforeTax	-4000000	USD
CY2015	ally	Other Comprehensive Income Loss Reclassification Adjustment For Net Investment Hedges Included In Net Income Discontinued Operation Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentForNetInvestmentHedgesIncludedInNetIncomeDiscontinuedOperationNetOfTax	-3000000	USD
CY2016	ally	Other Comprehensive Income Loss Reclassification Adjustment For Net Investment Hedges Included In Net Income Discontinued Operation Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentForNetInvestmentHedgesIncludedInNetIncomeDiscontinuedOperationNetOfTax	0	USD
CY2017	ally	Other Comprehensive Income Loss Reclassification Adjustment For Net Investment Hedges Included In Net Income Discontinued Operation Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentForNetInvestmentHedgesIncludedInNetIncomeDiscontinuedOperationNetOfTax	0	USD
CY2015	ally	Other Comprehensive Income Loss Reclassification Adjustment For Net Investment Hedges Included In Net Income Discontinued Operation Tax OtherComprehensiveIncomeLossReclassificationAdjustmentForNetInvestmentHedgesIncludedInNetIncomeDiscontinuedOperationTax	-1000000	USD
CY2015	ally	Other Comprehensive Income Unrealized Gain Loss On Net Investment Hedges Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedGainLossOnNetInvestmentHedgesArisingDuringPeriodBeforeTax	29000000	USD
CY2016	ally	Other Comprehensive Income Unrealized Gain Loss On Net Investment Hedges Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedGainLossOnNetInvestmentHedgesArisingDuringPeriodBeforeTax	1000000	USD
CY2017	ally	Other Comprehensive Income Unrealized Gain Loss On Net Investment Hedges Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedGainLossOnNetInvestmentHedgesArisingDuringPeriodBeforeTax	-10000000	USD
CY2015	ally	Other Comprehensive Income Unrealized Gain Loss On Net Investment Hedges Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedGainLossOnNetInvestmentHedgesArisingDuringPeriodNetOfTax	18000000	USD
CY2016	ally	Other Comprehensive Income Unrealized Gain Loss On Net Investment Hedges Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedGainLossOnNetInvestmentHedgesArisingDuringPeriodNetOfTax	1000000	USD
CY2017	ally	Other Comprehensive Income Unrealized Gain Loss On Net Investment Hedges Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedGainLossOnNetInvestmentHedgesArisingDuringPeriodNetOfTax	-6000000	USD
CY2015	ally	Other Comprehensive Income Unrealized Gain Loss On Net Investment Hedges Arising During Period Tax OtherComprehensiveIncomeUnrealizedGainLossOnNetInvestmentHedgesArisingDuringPeriodTax	11000000	USD
CY2016	ally	Other Comprehensive Income Unrealized Gain Loss On Net Investment Hedges Arising During Period Tax OtherComprehensiveIncomeUnrealizedGainLossOnNetInvestmentHedgesArisingDuringPeriodTax	0	USD
CY2017	ally	Other Comprehensive Income Unrealized Gain Loss On Net Investment Hedges Arising During Period Tax OtherComprehensiveIncomeUnrealizedGainLossOnNetInvestmentHedgesArisingDuringPeriodTax	-4000000	USD
CY2017Q4	ally	Other Non Attribute Valuation Allowance OtherNonAttributeValuationAllowance	3000000	USD
CY2017Q2	ally	Payables To Bank Subsidiaries PayablesToBankSubsidiaries	0	USD
CY2016Q4	ally	Payables To Nonbank Subsidiaries PayablesToNonbankSubsidiaries	0	USD
CY2017Q4	ally	Payables To Nonbank Subsidiaries PayablesToNonbankSubsidiaries	0	USD
CY2017Q4	ally	Percentofprincipledebtplusaccruedandunpaidinterestistheredemptionpriceif Allyredeemsthe Series2 Trup Sonorafter February152016. PercentofprincipledebtplusaccruedandunpaidinterestistheredemptionpriceifAllyredeemstheSeries2TRUPSonorafterFebruary152016.	1.00
CY2016Q4	ally	Restricted Cash Collections For Securitization Trust RestrictedCashCollectionsForSecuritizationTrust	1694000000	USD
CY2017Q4	ally	Restricted Cash Collections For Securitization Trust RestrictedCashCollectionsForSecuritizationTrust	812000000	USD
CY2015	ally	Restricted Stock Unitsand Performance Share Units RestrictedStockUnitsandPerformanceShareUnits	49000000	USD
CY2016Q4	ally	Pledged Assets Investment In Operating Leases PledgedAssetsInvestmentInOperatingLeases	2040000000	USD
CY2017Q4	ally	Pledged Assets Investment In Operating Leases PledgedAssetsInvestmentInOperatingLeases	457000000	USD
CY2016Q4	ally	Pledged Assets Mortgage Assets Held For Investment PledgedAssetsMortgageAssetsHeldForInvestment	10954000000	USD
CY2017Q4	ally	Pledged Assets Mortgage Assets Held For Investment PledgedAssetsMortgageAssetsHeldForInvestment	13579000000	USD
CY2015	ally	Preferred Stock Redemption PreferredStockRedemption	234000000	USD
CY2016Q4	ally	Premiums Receivable And Other Insurance Assets PremiumsReceivableAndOtherInsuranceAssets	1905000000	USD
CY2017Q4	ally	Premiums Receivable And Other Insurance Assets PremiumsReceivableAndOtherInsuranceAssets	2047000000	USD
CY2015	ally	Proceeds From Sales And Repayments Of Mortgage Loans Held For Investment Originally Designated As Held For Sale ProceedsFromSalesAndRepaymentsOfMortgageLoansHeldForInvestmentOriginallyDesignatedAsHeldForSale	68000000	USD
CY2016	ally	Proceeds From Sales And Repayments Of Mortgage Loans Held For Investment Originally Designated As Held For Sale ProceedsFromSalesAndRepaymentsOfMortgageLoansHeldForInvestmentOriginallyDesignatedAsHeldForSale	40000000	USD
CY2017	ally	Proceeds From Sales And Repayments Of Mortgage Loans Held For Investment Originally Designated As Held For Sale ProceedsFromSalesAndRepaymentsOfMortgageLoansHeldForInvestmentOriginallyDesignatedAsHeldForSale	36000000	USD
CY2015	ally	Provision For Loan Losses Expensed Including Discontinued Operations ProvisionForLoanLossesExpensedIncludingDiscontinuedOperations	707000000	USD
CY2016	ally	Provision For Loan Losses Expensed Including Discontinued Operations ProvisionForLoanLossesExpensedIncludingDiscontinuedOperations	917000000	USD
CY2017	ally	Provision For Loan Losses Expensed Including Discontinued Operations ProvisionForLoanLossesExpensedIncludingDiscontinuedOperations	1148000000	USD
CY2015	ally	Purchases Of Operating Lease Assets PurchasesOfOperatingLeaseAssets	4685000000	USD
CY2016	ally	Purchases Of Operating Lease Assets PurchasesOfOperatingLeaseAssets	3274000000	USD
CY2017	ally	Purchases Of Operating Lease Assets PurchasesOfOperatingLeaseAssets	4052000000	USD
CY2015	ally	Remarketing Fees RemarketingFees	101000000	USD
CY2016	ally	Remarketing Fees RemarketingFees	103000000	USD
CY2017	ally	Remarketing Fees RemarketingFees	104000000	USD
CY2016	ally	Restricted Stock Unitsand Performance Share Units RestrictedStockUnitsandPerformanceShareUnits	54000000	USD
CY2017	ally	Restricted Stock Unitsand Performance Share Units RestrictedStockUnitsandPerformanceShareUnits	60000000	USD
CY2015	ally	Returns Of Contributed Capital ReturnsOfContributedCapital	0	USD
CY2016	ally	Returns Of Contributed Capital ReturnsOfContributedCapital	0	USD
CY2017	ally	Returns Of Contributed Capital ReturnsOfContributedCapital	0	USD
CY2016Q4	ally	Securities Collateral Placedwith Counterparties SecuritiesCollateralPlacedwithCounterparties	72000000	USD
CY2017Q4	ally	Securities Collateral Placedwith Counterparties SecuritiesCollateralPlacedwithCounterparties	97000000	USD
CY2017Q4	ally	Shortduration Insurance Cotnracts Liabilityfor Unpaid Claimsand Allocated Claim Adjustment Expense Separately Presented ShortdurationInsuranceCotnractsLiabilityforUnpaidClaimsandAllocatedClaimAdjustmentExpenseSeparatelyPresented	2065000000	USD
CY2016Q4	ally	Standbylettersofcreditandotherguarantees Standbylettersofcreditandotherguarantees	8000000	USD
CY2017Q4	ally	Standbylettersofcreditandotherguarantees Standbylettersofcreditandotherguarantees	8000000	USD
CY2017Q4	ally	Stateand Local Tax Carryforwards Valuation Allowance StateandLocalTaxCarryforwardsValuationAllowance	137000000	USD
CY2015	ally	Stock Redemptionand Repurchase Premium StockRedemptionandRepurchasePremium	2364000000	USD
CY2015	ally	Stock Repurchaseand Redemption Premium StockRepurchaseandRedemptionPremium	2364000000	USD
CY2016Q4	ally	Total Finance Receivables And Loans From Bank Subsidiary TotalFinanceReceivablesAndLoansFromBankSubsidiary	0	USD
CY2017Q4	ally	Total Finance Receivables And Loans From Bank Subsidiary TotalFinanceReceivablesAndLoansFromBankSubsidiary	0	USD
CY2016Q4	ally	Total Finance Receivables And Loans From Nonbank Subsidiary TotalFinanceReceivablesAndLoansFromNonbankSubsidiary	0	USD
CY2017Q4	ally	Total Finance Receivables And Loans From Nonbank Subsidiary TotalFinanceReceivablesAndLoansFromNonbankSubsidiary	0	USD
CY2015	ally	Total Financing Revenue And Other Interest Income TotalFinancingRevenueAndOtherInterestIncome	8397000000	USD
CY2016	ally	Total Financing Revenue And Other Interest Income TotalFinancingRevenueAndOtherInterestIncome	8305000000	USD
CY2017	ally	Total Financing Revenue And Other Interest Income TotalFinancingRevenueAndOtherInterestIncome	8322000000	USD
CY2016Q4	ally	Total Primary Serviced Assets TotalPrimaryServicedAssets	121480000000	USD
CY2017Q4	ally	Total Primary Serviced Assets TotalPrimaryServicedAssets	116878000000	USD
CY2017	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
CY2018Q1	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	434771498	shares
CY2017	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	FY
CY2017	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2017
CY2017Q4	us-gaap	Accumulated Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	-173000000	USD
CY2015	ally	Undistributed Income Of Bank Subsidiaries UndistributedIncomeOfBankSubsidiaries	0	USD
CY2016	ally	Undistributed Income Of Bank Subsidiaries UndistributedIncomeOfBankSubsidiaries	0	USD
CY2017	ally	Undistributed Income Of Bank Subsidiaries UndistributedIncomeOfBankSubsidiaries	0	USD
CY2015	ally	Undistributed Income Of Nonbank Subsidiaries UndistributedIncomeOfNonbankSubsidiaries	0	USD
CY2016	ally	Undistributed Income Of Nonbank Subsidiaries UndistributedIncomeOfNonbankSubsidiaries	0	USD
CY2017	ally	Undistributed Income Of Nonbank Subsidiaries UndistributedIncomeOfNonbankSubsidiaries	0	USD
CY2016Q4	ally	Unusedrevolvingcreditlinecommitmentsandother Unusedrevolvingcreditlinecommitmentsandother	1995000000	USD
CY2017Q4	ally	Unusedrevolvingcreditlinecommitmentsandother Unusedrevolvingcreditlinecommitmentsandother	2341000000	USD
CY2016Q4	ally	Variable Interest Entity Debt VariableInterestEntityDebt	13300000000	USD
CY2017Q4	ally	Variable Interest Entity Debt VariableInterestEntityDebt	10200000000	USD
CY2015	ally	Vehicle Remarketing And Repossession VehicleRemarketingAndRepossession	78000000	USD
CY2016	ally	Vehicle Remarketing And Repossession VehicleRemarketingAndRepossession	95000000	USD
CY2017	ally	Vehicle Remarketing And Repossession VehicleRemarketingAndRepossession	110000000	USD
CY2016Q4	ally	Warehouseandconstructionlendingcommitments Warehouseandconstructionlendingcommitments	164000000	USD
CY2017Q4	ally	Warehouseandconstructionlendingcommitments Warehouseandconstructionlendingcommitments	144000000	USD
CY2017	dei	Amendment Flag AmendmentFlag	false
CY2017	dei	Document Period End Date DocumentPeriodEndDate	2017-12-31
CY2017	dei	Document Type DocumentType	10-K
CY2017	dei	Entity Central Index Key EntityCentralIndexKey	0000040729
CY2017	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
CY2017	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
CY2017Q2	dei	Entity Public Float EntityPublicFloat	9452901086	USD
CY2017	dei	Entity Registrant Name EntityRegistrantName	Ally Financial Inc.
CY2017	dei	Entity Voluntary Filers EntityVoluntaryFilers	No
CY2017	dei	Entity Well Known Seasoned Issuer EntityWellKnownSeasonedIssuer	Yes
CY2016Q4	invest	Derivative Notional Amount DerivativeNotionalAmount	34166000000	USD
CY2017Q4	invest	Derivative Notional Amount DerivativeNotionalAmount	23762000000	USD
CY2016Q4	us-gaap	Accounts And Other Receivables Net Current AccountsAndOtherReceivablesNetCurrent	100000000	USD
CY2017Q4	us-gaap	Accounts And Other Receivables Net Current AccountsAndOtherReceivablesNetCurrent	116000000	USD
CY2016Q4	us-gaap	Accounts Payable And Accrued Liabilities Current And Noncurrent AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrent	1737000000	USD
CY2017Q4	us-gaap	Accounts Payable And Accrued Liabilities Current And Noncurrent AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrent	1780000000	USD
CY2016Q4	us-gaap	Accounts Payable Current And Noncurrent AccountsPayableCurrentAndNoncurrent	649000000	USD
CY2017Q4	us-gaap	Accounts Payable Current And Noncurrent AccountsPayableCurrentAndNoncurrent	746000000	USD
CY2016Q4	us-gaap	Accrued Employee Benefits Current And Noncurrent AccruedEmployeeBenefitsCurrentAndNoncurrent	232000000	USD
CY2017Q4	us-gaap	Accrued Employee Benefits Current And Noncurrent AccruedEmployeeBenefitsCurrentAndNoncurrent	248000000	USD
CY2016Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	525000000	USD
CY2017Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	608000000	USD
CY2014Q4	us-gaap	Accumulated Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	-21000000	USD
CY2015Q4	us-gaap	Accumulated Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	-159000000	USD
CY2016Q4	us-gaap	Accumulated Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	-273000000	USD
CY2017Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-235000000	USD
CY2016	us-gaap	Allowance For Loan And Lease Losses Adjustments Net AllowanceForLoanAndLeaseLossesAdjustmentsNet	-26000000	USD
CY2015	us-gaap	Adjustments To Additional Paid In Capital Tax Effect From Share Based Compensation AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation	62000000	USD
CY2016	us-gaap	Adjustments To Additional Paid In Capital Tax Effect From Share Based Compensation AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation	66000000	USD
CY2017	us-gaap	Adjustments To Additional Paid In Capital Tax Effect From Share Based Compensation AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation	79000000	USD
CY2014Q4	us-gaap	Accumulated Other Comprehensive Income Loss Cumulative Changes In Net Gain Loss From Cash Flow Hedges Effect Net Of Tax AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax	7000000	USD
CY2015Q4	us-gaap	Accumulated Other Comprehensive Income Loss Cumulative Changes In Net Gain Loss From Cash Flow Hedges Effect Net Of Tax AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax	8000000	USD
CY2016Q4	us-gaap	Accumulated Other Comprehensive Income Loss Cumulative Changes In Net Gain Loss From Cash Flow Hedges Effect Net Of Tax AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax	8000000	USD
CY2017Q4	us-gaap	Accumulated Other Comprehensive Income Loss Cumulative Changes In Net Gain Loss From Cash Flow Hedges Effect Net Of Tax AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax	11000000	USD
CY2014Q4	us-gaap	Accumulated Other Comprehensive Income Loss Defined Benefit Pension And Other Postretirement Plans Net Of Tax AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax	88000000	USD
CY2015Q4	us-gaap	Accumulated Other Comprehensive Income Loss Defined Benefit Pension And Other Postretirement Plans Net Of Tax AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax	89000000	USD
CY2016Q4	us-gaap	Accumulated Other Comprehensive Income Loss Defined Benefit Pension And Other Postretirement Plans Net Of Tax AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax	90000000	USD
CY2017Q4	us-gaap	Accumulated Other Comprehensive Income Loss Defined Benefit Pension And Other Postretirement Plans Net Of Tax AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax	89000000	USD
CY2014Q4	us-gaap	Accumulated Other Comprehensive Income Loss Foreign Currency Translation Adjustment Net Of Tax AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax	36000000	USD
CY2015Q4	us-gaap	Accumulated Other Comprehensive Income Loss Foreign Currency Translation Adjustment Net Of Tax AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax	9000000	USD
CY2016Q4	us-gaap	Accumulated Other Comprehensive Income Loss Foreign Currency Translation Adjustment Net Of Tax AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax	14000000	USD
CY2017Q4	us-gaap	Accumulated Other Comprehensive Income Loss Foreign Currency Translation Adjustment Net Of Tax AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax	16000000	USD
CY2014Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-66000000	USD
CY2015Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-231000000	USD
CY2016Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-341000000	USD
CY2016	us-gaap	Allowance For Loan And Lease Loss Recovery Of Bad Debts AllowanceForLoanAndLeaseLossRecoveryOfBadDebts	341000000	USD
CY2017	us-gaap	Allowance For Loan And Lease Loss Recovery Of Bad Debts AllowanceForLoanAndLeaseLossRecoveryOfBadDebts	382000000	USD
CY2017	us-gaap	Allowance For Loan And Lease Losses Adjustments Net AllowanceForLoanAndLeaseLossesAdjustmentsNet	-6000000	USD
CY2016	us-gaap	Allowance For Loan And Lease Losses Write Offs AllowanceForLoanAndLeaseLossesWriteOffs	1142000000	USD
CY2017	us-gaap	Allowance For Loan And Lease Losses Write Offs AllowanceForLoanAndLeaseLossesWriteOffs	1392000000	USD
CY2016	us-gaap	Allowance For Loan And Lease Losses Writeoffs Net AllowanceForLoanAndLeaseLossesWriteoffsNet	801000000	USD
CY2017	us-gaap	Allowance For Loan And Lease Losses Writeoffs Net AllowanceForLoanAndLeaseLossesWriteoffsNet	1010000000	USD
CY2016	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	6000000	USD
CY2017	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	10000000	USD
CY2015Q4	us-gaap	Assets Assets	158581000000	USD
CY2016Q4	us-gaap	Assets Assets	163728000000	USD
CY2017Q4	us-gaap	Assets Assets	167148000000	USD
CY2016Q4	us-gaap	Available For Sale Securities AvailableForSaleSecurities	18926000000	USD
CY2017Q4	us-gaap	Available For Sale Securities AvailableForSaleSecurities	22821000000	USD
CY2016Q4	us-gaap	Available For Sale Securities Amortized Cost AvailableForSaleSecuritiesAmortizedCost	19293000000	USD
CY2017Q4	us-gaap	Available For Sale Securities Amortized Cost AvailableForSaleSecuritiesAmortizedCost	23052000000	USD
CY2016	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position12 Months Or Longer Aggregate Losses AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLosses	118000000	USD
CY2017	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position12 Months Or Longer Aggregate Losses AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLosses	263000000	USD
CY2016	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Less Than12 Months Aggregate Losses AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAggregateLosses	317000000	USD
CY2017	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Less Than12 Months Aggregate Losses AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAggregateLosses	50000000	USD
CY2016Q4	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Less Than Twelve Months Fair Value AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue	12356000000	USD
CY2017Q4	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Less Than Twelve Months Fair Value AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue	6667000000	USD
CY2016Q4	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or Longer Fair Value AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue	2038000000	USD
CY2017Q4	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or Longer Fair Value AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue	8358000000	USD
CY2015	us-gaap	Available For Sale Securities Gross Realized Gain Loss Net AvailableForSaleSecuritiesGrossRealizedGainLossNet	155000000	USD
CY2016	us-gaap	Available For Sale Securities Gross Realized Gain Loss Net AvailableForSaleSecuritiesGrossRealizedGainLossNet	185000000	USD
CY2017	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	539000000	USD
CY2015	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	548000000	USD
CY2016	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	-832000000	USD
CY2017	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	-2612000000	USD
CY2016Q4	us-gaap	Cash And Due From Banks CashAndDueFromBanks	1547000000	USD
CY2017	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.40
CY2017	us-gaap	Available For Sale Securities Gross Realized Gain Loss Net AvailableForSaleSecuritiesGrossRealizedGainLossNet	102000000	USD
CY2015	us-gaap	Available For Sale Securities Gross Realized Gains AvailableForSaleSecuritiesGrossRealizedGains	184000000	USD
CY2016	us-gaap	Available For Sale Securities Gross Realized Gains AvailableForSaleSecuritiesGrossRealizedGains	187000000	USD
CY2017	us-gaap	Available For Sale Securities Gross Realized Gains AvailableForSaleSecuritiesGrossRealizedGains	106000000	USD
CY2015	us-gaap	Available For Sale Securities Gross Realized Losses AvailableForSaleSecuritiesGrossRealizedLosses	15000000	USD
CY2016	us-gaap	Available For Sale Securities Gross Realized Losses AvailableForSaleSecuritiesGrossRealizedLosses	2000000	USD
CY2017	us-gaap	Available For Sale Securities Gross Realized Losses AvailableForSaleSecuritiesGrossRealizedLosses	4000000	USD
CY2016	us-gaap	Available For Sale Securities Gross Unrealized Gains AvailableForSaleSecuritiesGrossUnrealizedGains	68000000	USD
CY2017	us-gaap	Available For Sale Securities Gross Unrealized Gains AvailableForSaleSecuritiesGrossUnrealizedGains	82000000	USD
CY2016	us-gaap	Available For Sale Securities Gross Unrealized Loss AvailableForSaleSecuritiesGrossUnrealizedLoss	435000000	USD
CY2017	us-gaap	Available For Sale Securities Gross Unrealized Loss AvailableForSaleSecuritiesGrossUnrealizedLoss	313000000	USD
CY2015	us-gaap	Availableforsale Securities Gross Realized Gain Loss Excluding Other Than Temporary Impairments AvailableforsaleSecuritiesGrossRealizedGainLossExcludingOtherThanTemporaryImpairments	155000000	USD
CY2016	us-gaap	Availableforsale Securities Gross Realized Gain Loss Excluding Other Than Temporary Impairments AvailableforsaleSecuritiesGrossRealizedGainLossExcludingOtherThanTemporaryImpairments	185000000	USD
CY2017	us-gaap	Availableforsale Securities Gross Realized Gain Loss Excluding Other Than Temporary Impairments AvailableforsaleSecuritiesGrossRealizedGainLossExcludingOtherThanTemporaryImpairments	102000000	USD
CY2017Q4	us-gaap	Capital Required For Capital Adequacy To Risk Weighted Assets CapitalRequiredForCapitalAdequacyToRiskWeightedAssets	0.08
CY2016Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	5934000000	USD
CY2017Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	4252000000	USD
CY2017Q4	us-gaap	Cash And Due From Banks CashAndDueFromBanks	844000000	USD
CY2014Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	8165000000	USD
CY2015Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	8713000000	USD
CY2016Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	7881000000	USD
CY2017Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	5269000000	USD
CY2015	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	548000000	USD
CY2016	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	-832000000	USD
CY2017	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	-2612000000	USD
CY2016	us-gaap	Cash Dividends Paid To Parent Company CashDividendsPaidToParentCompany	0	USD
CY2017	us-gaap	Cash Dividends Paid To Parent Company CashDividendsPaidToParentCompany	3300000000	USD
CY2017Q3	us-gaap	Cash Dividends Paid To Parent Company By Consolidated Subsidiaries CashDividendsPaidToParentCompanyByConsolidatedSubsidiaries	2900000000	USD
CY2017Q4	us-gaap	Cash Dividends Paid To Parent Company By Consolidated Subsidiaries CashDividendsPaidToParentCompanyByConsolidatedSubsidiaries	400000000	USD
CY2016Q4	us-gaap	Cash Equivalents At Carrying Value CashEquivalentsAtCarryingValue	291000000	USD
CY2017Q4	us-gaap	Cash Equivalents At Carrying Value CashEquivalentsAtCarryingValue	10000000	USD
CY2015	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.00
CY2016Q1	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.00
CY2016Q2	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.00
CY2016Q3	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.08
CY2016Q4	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.08
CY2016	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.16
CY2017Q1	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.08
CY2017Q2	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.08
CY2017Q3	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.12
CY2017Q4	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.12
CY2016Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.01
CY2015	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	487000000	USD
CY2016	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	453000000	USD
CY2016	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	957000000	USD
CY2017	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	1035000000	USD
CY2015	us-gaap	Contractually Specified Servicing Fees Late Fees And Ancillary Fees Earned In Exchange For Servicing Financial Assets ContractuallySpecifiedServicingFeesLateFeesAndAncillaryFeesEarnedInExchangeForServicingFinancialAssets	45000000	USD
CY2017Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.01
CY2016Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	1100000000	shares
CY2017Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	1100000000	shares
CY2014Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	480136039	shares
CY2015Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	482790696	shares
CY2016Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	485707644	shares
CY2017Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	489883553	shares
CY2015Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	481980111	shares
CY2016Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	467000306	shares
CY2017Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	437053936	shares
CY2016Q4	us-gaap	Common Stocks Including Additional Paid In Capital Net Of Discount CommonStocksIncludingAdditionalPaidInCapitalNetOfDiscount	21166000000	USD
CY2017Q4	us-gaap	Common Stocks Including Additional Paid In Capital Net Of Discount CommonStocksIncludingAdditionalPaidInCapitalNetOfDiscount	21245000000	USD
CY2015	us-gaap	Communications And Information Technology CommunicationsAndInformationTechnology	267000000	USD
CY2016	us-gaap	Communications And Information Technology CommunicationsAndInformationTechnology	274000000	USD
CY2017	us-gaap	Communications And Information Technology CommunicationsAndInformationTechnology	284000000	USD
CY2015	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	1124000000	USD
CY2016	us-gaap	Contractually Specified Servicing Fees Late Fees And Ancillary Fees Earned In Exchange For Servicing Financial Assets ContractuallySpecifiedServicingFeesLateFeesAndAncillaryFeesEarnedInExchangeForServicingFinancialAssets	64000000	USD
CY2017	us-gaap	Contractually Specified Servicing Fees Late Fees And Ancillary Fees Earned In Exchange For Servicing Financial Assets ContractuallySpecifiedServicingFeesLateFeesAndAncillaryFeesEarnedInExchangeForServicingFinancialAssets	51000000	USD
CY2015	us-gaap	Cumulative Translation Adjustment Net Of Tax Period Increase Decrease CumulativeTranslationAdjustmentNetOfTaxPeriodIncreaseDecrease	59000000	USD
CY2016	us-gaap	Cumulative Translation Adjustment Net Of Tax Period Increase Decrease CumulativeTranslationAdjustmentNetOfTaxPeriodIncreaseDecrease	4000000	USD
CY2017	us-gaap	Cumulative Translation Adjustment Net Of Tax Period Increase Decrease CumulativeTranslationAdjustmentNetOfTaxPeriodIncreaseDecrease	12000000	USD
CY2015	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	0	USD
CY2016	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	0	USD
CY2017	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	-17000000	USD
CY2015	us-gaap	Current Foreign Tax Expense Benefit CurrentForeignTaxExpenseBenefit	6000000	USD
CY2016	us-gaap	Current Foreign Tax Expense Benefit CurrentForeignTaxExpenseBenefit	8000000	USD
CY2017	us-gaap	Current Foreign Tax Expense Benefit CurrentForeignTaxExpenseBenefit	6000000	USD
CY2015	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	9000000	USD
CY2016	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	17000000	USD
CY2017	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	42000000	USD
CY2015	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	3000000	USD
CY2016	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	9000000	USD
CY2017	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	53000000	USD
CY2016Q4	us-gaap	Customer Securities For Which Entity Has Right To Sell Or Repledge Fair Value CustomerSecuritiesForWhichEntityHasRightToSellOrRepledgeFairValue	6000000	USD
CY2017Q4	us-gaap	Customer Securities For Which Entity Has Right To Sell Or Repledge Fair Value CustomerSecuritiesForWhichEntityHasRightToSellOrRepledgeFairValue	2000000	USD
CY2017Q4	us-gaap	Debt Instrument Interest Rate Stated Percentage DebtInstrumentInterestRateStatedPercentage	0.0813
CY2015	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	454000000	USD
CY2016	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	423000000	USD
CY2017	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	566000000	USD
CY2015	us-gaap	Deferred Foreign Income Tax Expense Benefit DeferredForeignIncomeTaxExpenseBenefit	1000000	USD
CY2016	us-gaap	Deferred Foreign Income Tax Expense Benefit DeferredForeignIncomeTaxExpenseBenefit	0	USD
CY2017	us-gaap	Deferred Foreign Income Tax Expense Benefit DeferredForeignIncomeTaxExpenseBenefit	0	USD
CY2016Q4	us-gaap	Deferred Policy Acquisition Costs DeferredPolicyAcquisitionCosts	1258000000	USD
CY2017Q4	us-gaap	Deferred Policy Acquisition Costs DeferredPolicyAcquisitionCosts	1329000000	USD
CY2016Q4	us-gaap	Deferred Revenue DeferredRevenue	56000000	USD
CY2017Q4	us-gaap	Deferred Revenue DeferredRevenue	32000000	USD
CY2015	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	32000000	USD
CY2016	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	30000000	USD
CY2017	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	-27000000	USD
CY2017Q4	us-gaap	Deferred Tax Assets Capital Loss Carryforwards DeferredTaxAssetsCapitalLossCarryforwards	2000000	USD
CY2016Q4	us-gaap	Deferred Tax Assets Liabilities Net DeferredTaxAssetsLiabilitiesNet	994000000	USD
CY2017Q4	us-gaap	Deferred Tax Assets Liabilities Net DeferredTaxAssetsLiabilitiesNet	461000000	USD
CY2017Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	302000000	USD
CY2017Q4	us-gaap	Deferred Tax Assets Tax Credit Carryforwards DeferredTaxAssetsTaxCreditCarryforwards	2002000000	USD
CY2017Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	1123000000	USD
CY2016Q4	us-gaap	Delinquent Amount At End Of Period On Loans Managed And Securitized DelinquentAmountAtEndOfPeriodOnLoansManagedAndSecuritized	19000000	USD
CY2017Q4	us-gaap	Delinquent Amount At End Of Period On Loans Managed And Securitized DelinquentAmountAtEndOfPeriodOnLoansManagedAndSecuritized	20000000	USD
CY2016Q4	us-gaap	Deposit Assets DepositAssets	14000000	USD
CY2017Q4	us-gaap	Deposit Assets DepositAssets	12000000	USD
CY2016Q4	us-gaap	Deposits Deposits	79022000000	USD
CY2017Q4	us-gaap	Deposits Deposits	93256000000	USD
CY2016Q4	us-gaap	Deposits Savings Deposits DepositsSavingsDeposits	46976000000	USD
CY2017Q4	us-gaap	Deposits Savings Deposits DepositsSavingsDeposits	49267000000	USD
CY2015	us-gaap	Depreciation Amortization And Accretion Net DepreciationAmortizationAndAccretionNet	2801000000	USD
CY2016	us-gaap	Depreciation Amortization And Accretion Net DepreciationAmortizationAndAccretionNet	2382000000	USD
CY2017	us-gaap	Depreciation Amortization And Accretion Net DepreciationAmortizationAndAccretionNet	1859000000	USD
CY2015	us-gaap	Depreciation Nonproduction DepreciationNonproduction	82000000	USD
CY2016	us-gaap	Depreciation Nonproduction DepreciationNonproduction	84000000	USD
CY2017	us-gaap	Depreciation Nonproduction DepreciationNonproduction	89000000	USD
CY2016Q4	us-gaap	Derivative Amount Of Hedged Item DerivativeAmountOfHedgedItem	315000000	USD
CY2017Q4	us-gaap	Derivative Amount Of Hedged Item DerivativeAmountOfHedgedItem	208000000	USD
CY2016Q4	us-gaap	Derivative Fair Value Of Derivative Asset DerivativeFairValueOfDerivativeAsset	95000000	USD
CY2017Q4	us-gaap	Derivative Fair Value Of Derivative Asset DerivativeFairValueOfDerivativeAsset	39000000	USD
CY2016Q4	us-gaap	Derivative Fair Value Of Derivative Liability DerivativeFairValueOfDerivativeLiability	95000000	USD
CY2017Q4	us-gaap	Derivative Fair Value Of Derivative Liability DerivativeFairValueOfDerivativeLiability	41000000	USD
CY2015	us-gaap	Discontinued Operation Gain Loss From Disposal Of Discontinued Operation Before Income Tax DiscontinuedOperationGainLossFromDisposalOfDiscontinuedOperationBeforeIncomeTax	452000000	USD
CY2016	us-gaap	Discontinued Operation Gain Loss From Disposal Of Discontinued Operation Before Income Tax DiscontinuedOperationGainLossFromDisposalOfDiscontinuedOperationBeforeIncomeTax	0	USD
CY2017	us-gaap	Discontinued Operation Gain Loss From Disposal Of Discontinued Operation Before Income Tax DiscontinuedOperationGainLossFromDisposalOfDiscontinuedOperationBeforeIncomeTax	0	USD
CY2015	us-gaap	Dividend Income Operating DividendIncomeOperating	23000000	USD
CY2016	us-gaap	Dividend Income Operating DividendIncomeOperating	17000000	USD
CY2017	us-gaap	Dividend Income Operating DividendIncomeOperating	12000000	USD
CY2016	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	78000000	USD
CY2017	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	184000000	USD
CY2017Q4	us-gaap	Dividends Payable Amount Per Share DividendsPayableAmountPerShare	0.13
CY2018Q1	us-gaap	Dividends Payable Amount Per Share DividendsPayableAmountPerShare	0.13
CY2015	us-gaap	Dividends Preferred Stock Cash DividendsPreferredStockCash	2571000000	USD
CY2016	us-gaap	Dividends Preferred Stock Cash DividendsPreferredStockCash	30000000	USD
CY2017	us-gaap	Dividends Preferred Stock Cash DividendsPreferredStockCash	0	USD
CY2015	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-2.66
CY2017	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.04
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CY2016Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.71
CY2016Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.43
CY2016Q4	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.53
CY2016	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.15
CY2017Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.46
CY2017Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.55
CY2017Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.63
CY2017Q4	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.41
CY2017	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.05
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CY2016Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.49
CY2016Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.71
CY2016Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.43
CY2016Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.52
CY2016	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.15
CY2017Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.46
CY2017Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.55
CY2017Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.63
CY2017Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.41
CY2015	us-gaap	Effect Of Exchange Rate On Cash And Cash Equivalents EffectOfExchangeRateOnCashAndCashEquivalents	-4000000	USD
CY2016	us-gaap	Effect Of Exchange Rate On Cash And Cash Equivalents EffectOfExchangeRateOnCashAndCashEquivalents	1000000	USD
CY2017	us-gaap	Effect Of Exchange Rate On Cash And Cash Equivalents EffectOfExchangeRateOnCashAndCashEquivalents	3000000	USD
CY2015	us-gaap	Equity Method Investment Realized Gain Loss On Disposal EquityMethodInvestmentRealizedGainLossOnDisposal	400000000	USD
CY2016	us-gaap	Fair Value Assets Measured On Recurring Basis Change In Unrealized Gain Loss FairValueAssetsMeasuredOnRecurringBasisChangeInUnrealizedGainLoss	0	USD
CY2017	us-gaap	Fair Value Assets Measured On Recurring Basis Change In Unrealized Gain Loss FairValueAssetsMeasuredOnRecurringBasisChangeInUnrealizedGainLoss	1000000	USD
CY2016	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Gain Loss Included In Earnings1 FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1	4000000	USD
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CY2016	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Gain Loss Included In Other Comprehensive Income Loss FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss	0	USD
CY2017	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Gain Loss Included In Other Comprehensive Income Loss FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss	0	USD
CY2016	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Issues FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetIssues	0	USD
CY2017	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Issues FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetIssues	0	USD
CY2016	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Purchases FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases	0	USD
CY2017	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Purchases FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases	137000000	USD
CY2016	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Sales FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales	-9000000	USD
CY2017	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Sales FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales	118000000	USD
CY2016	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Settlements FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements	24000000	USD
CY2017	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Settlements FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements	33000000	USD
CY2015Q4	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Value FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue	40000000	USD
CY2016Q4	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Value FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue	29000000	USD
CY2017Q4	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Value FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue	19000000	USD
CY2015	us-gaap	Federal Deposit Insurance Corporation Premium Expense FederalDepositInsuranceCorporationPremiumExpense	79000000	USD
CY2016	us-gaap	Federal Deposit Insurance Corporation Premium Expense FederalDepositInsuranceCorporationPremiumExpense	94000000	USD
CY2017	us-gaap	Federal Deposit Insurance Corporation Premium Expense FederalDepositInsuranceCorporationPremiumExpense	113000000	USD
CY2016Q4	us-gaap	Federal Home Loan Bank Advances Maturities Summary Due Within One Year Of Balance Sheet Date FederalHomeLoanBankAdvancesMaturitiesSummaryDueWithinOneYearOfBalanceSheetDate	7875000000	USD
CY2017Q4	us-gaap	Federal Home Loan Bank Advances Maturities Summary Due Within One Year Of Balance Sheet Date FederalHomeLoanBankAdvancesMaturitiesSummaryDueWithinOneYearOfBalanceSheetDate	7350000000	USD
CY2016Q4	us-gaap	Federal Home Loan Bank Stock FederalHomeLoanBankStock	577000000	USD
CY2017Q4	us-gaap	Financing Receivable Individually Evaluated For Impairment FinancingReceivableIndividuallyEvaluatedForImpairment	733000000	USD
CY2017Q4	us-gaap	Federal Home Loan Bank Stock FederalHomeLoanBankStock	745000000	USD
CY2016Q4	us-gaap	Federal Reserve Bank Stock FederalReserveBankStock	435000000	USD
CY2017Q4	us-gaap	Federal Reserve Bank Stock FederalReserveBankStock	445000000	USD
CY2015	us-gaap	Fees And Commissions Other FeesAndCommissionsOther	90000000	USD
CY2016	us-gaap	Fees And Commissions Other FeesAndCommissionsOther	98000000	USD
CY2017	us-gaap	Fees And Commissions Other FeesAndCommissionsOther	102000000	USD
CY2016Q4	us-gaap	Financial Instruments Owned And Pledged As Collateral Amount Eligible To Be Repledged By Counterparty FinancialInstrumentsOwnedAndPledgedAsCollateralAmountEligibleToBeRepledgedByCounterparty	737000000	USD
CY2017Q4	us-gaap	Financial Instruments Owned And Pledged As Collateral Amount Eligible To Be Repledged By Counterparty FinancialInstrumentsOwnedAndPledgedAsCollateralAmountEligibleToBeRepledgedByCounterparty	1025000000	USD
CY2015Q4	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	1054000000	USD
CY2016Q4	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	1144000000	USD
CY2017Q4	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	1276000000	USD
CY2016Q4	us-gaap	Financing Receivable Allowance For Credit Losses Collectively Evaluated For Impairment FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment	1059000000	USD
CY2017Q4	us-gaap	Financing Receivable Allowance For Credit Losses Collectively Evaluated For Impairment FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment	1199000000	USD
CY2016Q4	us-gaap	Financing Receivable Allowance For Credit Losses Individually Evaluated For Impairment1 FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1	85000000	USD
CY2017Q4	us-gaap	Financing Receivable Allowance For Credit Losses Individually Evaluated For Impairment1 FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1	77000000	USD
CY2016Q4	us-gaap	Financing Receivable Collectively Evaluated For Impairment FinancingReceivableCollectivelyEvaluatedForImpairment	118205000000	USD
CY2017Q4	us-gaap	Financing Receivable Collectively Evaluated For Impairment FinancingReceivableCollectivelyEvaluatedForImpairment	122160000000	USD
CY2016Q4	us-gaap	Financing Receivable Individually Evaluated For Impairment FinancingReceivableIndividuallyEvaluatedForImpairment	739000000	USD
CY2016	us-gaap	Financing Receivable Modifications Number Of Contracts2 FinancingReceivableModificationsNumberOfContracts2	20355
CY2017	us-gaap	Financing Receivable Modifications Number Of Contracts2 FinancingReceivableModificationsNumberOfContracts2	26288
CY2016	us-gaap	Financing Receivable Modifications Post Modification Recorded Investment2 FinancingReceivableModificationsPostModificationRecordedInvestment2	321000000	USD
CY2017	us-gaap	Financing Receivable Modifications Post Modification Recorded Investment2 FinancingReceivableModificationsPostModificationRecordedInvestment2	417000000	USD
CY2016	us-gaap	Financing Receivable Modifications Pre Modification Recorded Investment2 FinancingReceivableModificationsPreModificationRecordedInvestment2	375000000	USD
CY2017	us-gaap	Financing Receivable Modifications Pre Modification Recorded Investment2 FinancingReceivableModificationsPreModificationRecordedInvestment2	465000000	USD
CY2016Q4	us-gaap	Financing Receivable Modifications Recorded Investment FinancingReceivableModificationsRecordedInvestment	663000000	USD
CY2017Q4	us-gaap	Financing Receivable Modifications Recorded Investment FinancingReceivableModificationsRecordedInvestment	712000000	USD
CY2016Q4	us-gaap	Financing Receivable Recorded Investment Current FinancingReceivableRecordedInvestmentCurrent	116185000000	USD
CY2017Q4	us-gaap	Financing Receivable Recorded Investment Current FinancingReceivableRecordedInvestmentCurrent	119926000000	USD
CY2016Q4	us-gaap	Financing Receivable Recorded Investment Nonaccrual Status FinancingReceivableRecordedInvestmentNonaccrualStatus	819000000	USD
CY2017Q4	us-gaap	Financing Receivable Recorded Investment Nonaccrual Status FinancingReceivableRecordedInvestmentNonaccrualStatus	792000000	USD
CY2016Q4	us-gaap	Financing Receivable Recorded Investment Past Due FinancingReceivableRecordedInvestmentPastDue	2759000000	USD
CY2017Q4	us-gaap	Financing Receivable Recorded Investment Past Due FinancingReceivableRecordedInvestmentPastDue	2967000000	USD
CY2016	us-gaap	Financing Receivable Significant Purchases FinancingReceivableSignificantPurchases	3768000000	USD
CY2017	us-gaap	Financing Receivable Significant Purchases FinancingReceivableSignificantPurchases	5346000000	USD
CY2015	us-gaap	Gain Loss On Derivative Instruments Net Pretax GainLossOnDerivativeInstrumentsNetPretax	-121000000	USD
CY2016	us-gaap	Gain Loss On Derivative Instruments Net Pretax GainLossOnDerivativeInstrumentsNetPretax	-8000000	USD
CY2017	us-gaap	Gain Loss On Derivative Instruments Net Pretax GainLossOnDerivativeInstrumentsNetPretax	-6000000	USD
CY2015	us-gaap	Gain Loss On Sales Of Loans Net GainLossOnSalesOfLoansNet	45000000	USD
CY2016	us-gaap	Gain Loss On Sales Of Loans Net GainLossOnSalesOfLoansNet	11000000	USD
CY2017	us-gaap	Gain Loss On Sales Of Loans Net GainLossOnSalesOfLoansNet	68000000	USD
CY2015	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	-357000000	USD
CY2016	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	-5000000	USD
CY2017	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	-7000000	USD
CY2017Q4	us-gaap	Impaired Financing Receivable Recorded Investment ImpairedFinancingReceivableRecordedInvestment	733000000	USD
CY2016Q4	us-gaap	Goodwill Goodwill	240000000	USD
CY2017Q4	us-gaap	Goodwill Goodwill	240000000	USD
CY2016Q4	us-gaap	Held To Maturity Securities HeldToMaturitySecurities	839000000	USD
CY2017Q4	us-gaap	Held To Maturity Securities HeldToMaturitySecurities	1899000000	USD
CY2016Q4	us-gaap	Held To Maturity Securities Amortized Cost Before Other Than Temporary Impairment HeldToMaturitySecuritiesAmortizedCostBeforeOtherThanTemporaryImpairment	839000000	USD
CY2016Q4	us-gaap	Held To Maturity Securities Debt Maturities After Five Through Ten Years Net Carrying Amount HeldToMaturitySecuritiesDebtMaturitiesAfterFiveThroughTenYearsNetCarryingAmount	0	USD
CY2016Q4	us-gaap	Held To Maturity Securities Debt Maturities After One Through Five Years Net Carrying Amount HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsNetCarryingAmount	0	USD
CY2016Q4	us-gaap	Held To Maturity Securities Debt Maturities After Ten Years Net Carrying Amount HeldToMaturitySecuritiesDebtMaturitiesAfterTenYearsNetCarryingAmount	839000000	USD
CY2016Q4	us-gaap	Held To Maturity Securities Debt Maturities Within One Year Net Carrying Amount HeldToMaturitySecuritiesDebtMaturitiesWithinOneYearNetCarryingAmount	0	USD
CY2016Q4	us-gaap	Held To Maturity Securities Fair Value HeldToMaturitySecuritiesFairValue	789000000	USD
CY2017Q4	us-gaap	Held To Maturity Securities Fair Value HeldToMaturitySecuritiesFairValue	1865000000	USD
CY2015	us-gaap	Impaired Financing Receivable Average Recorded Investment ImpairedFinancingReceivableAverageRecordedInvestment	654000000	USD
CY2016	us-gaap	Impaired Financing Receivable Average Recorded Investment ImpairedFinancingReceivableAverageRecordedInvestment	701000000	USD
CY2017	us-gaap	Impaired Financing Receivable Average Recorded Investment ImpairedFinancingReceivableAverageRecordedInvestment	756000000	USD
CY2015	us-gaap	Impaired Financing Receivable Interest Income Accrual Method ImpairedFinancingReceivableInterestIncomeAccrualMethod	29000000	USD
CY2016	us-gaap	Impaired Financing Receivable Interest Income Accrual Method ImpairedFinancingReceivableInterestIncomeAccrualMethod	28000000	USD
CY2017	us-gaap	Impaired Financing Receivable Interest Income Accrual Method ImpairedFinancingReceivableInterestIncomeAccrualMethod	42000000	USD
CY2016Q4	us-gaap	Impaired Financing Receivable Recorded Investment ImpairedFinancingReceivableRecordedInvestment	739000000	USD
CY2016Q4	us-gaap	Impaired Financing Receivable Related Allowance ImpairedFinancingReceivableRelatedAllowance	85000000	USD
CY2017Q4	us-gaap	Impaired Financing Receivable Related Allowance ImpairedFinancingReceivableRelatedAllowance	77000000	USD
CY2016Q4	us-gaap	Impaired Financing Receivable Unpaid Principal Balance ImpairedFinancingReceivableUnpaidPrincipalBalance	795000000	USD
CY2017Q4	us-gaap	Impaired Financing Receivable Unpaid Principal Balance ImpairedFinancingReceivableUnpaidPrincipalBalance	756000000	USD
CY2016Q4	us-gaap	Impaired Financing Receivable With No Related Allowance Recorded Investment ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment	199000000	USD
CY2017Q4	us-gaap	Impaired Financing Receivable With No Related Allowance Recorded Investment ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment	172000000	USD
CY2016Q4	us-gaap	Impaired Financing Receivable With Related Allowance Recorded Investment ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment	540000000	USD
CY2017Q4	us-gaap	Impaired Financing Receivable With Related Allowance Recorded Investment ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment	561000000	USD
CY2015	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	897000000	USD
CY2016Q1	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	247000000	USD
CY2016Q2	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	357000000	USD
CY2016Q3	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	261000000	USD
CY2016Q4	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	246000000	USD
CY2016	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	1111000000	USD
CY2017Q1	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	213000000	USD
CY2017Q2	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	254000000	USD
CY2017Q3	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	280000000	USD
CY2017Q4	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	179000000	USD
CY2017	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	926000000	USD
CY2015	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	1393000000	USD
CY2016Q1	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	397000000	USD
CY2016Q2	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	413000000	USD
CY2016Q3	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	391000000	USD
CY2016Q4	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	380000000	USD
CY2016	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	1581000000	USD
CY2015	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	-4000000	USD
CY2017Q1	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	326000000	USD
CY2017Q2	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	376000000	USD
CY2017Q3	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	395000000	USD
CY2017Q4	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	410000000	USD
CY2017	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	1507000000	USD
CY2015	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	-3.47
CY2016Q1	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	0.48
CY2016Q2	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	0.70
CY2016Q3	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	0.54
CY2016Q4	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	0.52
CY2016	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	2.25
CY2017Q1	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	0.46
CY2017Q2	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	0.55
CY2017Q3	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	0.62
CY2017Q4	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	0.40
CY2017	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	2.04
CY2015	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	-3.47
CY2016Q1	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	0.48
CY2016Q2	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	0.70
CY2016Q3	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	0.54
CY2016Q4	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	0.52
CY2016	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	2.24
CY2017Q1	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	0.46
CY2017Q2	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	0.55
CY2017Q3	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	0.62
CY2017Q4	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	0.40
CY2017	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	2.03
CY2015	us-gaap	Income Loss From Discontinued Operations Net Of Tax Attributable To Reporting Entity IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity	392000000	USD
CY2016Q1	us-gaap	Income Loss From Discontinued Operations Net Of Tax Attributable To Reporting Entity IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity	3000000	USD
CY2016Q2	us-gaap	Income Loss From Discontinued Operations Net Of Tax Attributable To Reporting Entity IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity	3000000	USD
CY2016Q3	us-gaap	Income Loss From Discontinued Operations Net Of Tax Attributable To Reporting Entity IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity	-52000000	USD
CY2016Q4	us-gaap	Income Loss From Discontinued Operations Net Of Tax Attributable To Reporting Entity IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity	2000000	USD
CY2016	us-gaap	Income Loss From Discontinued Operations Net Of Tax Attributable To Reporting Entity IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity	-44000000	USD
CY2017Q1	us-gaap	Income Loss From Discontinued Operations Net Of Tax Attributable To Reporting Entity IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity	1000000	USD
CY2017Q2	us-gaap	Income Loss From Discontinued Operations Net Of Tax Attributable To Reporting Entity IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity	-2000000	USD
CY2017Q3	us-gaap	Income Loss From Discontinued Operations Net Of Tax Attributable To Reporting Entity IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity	2000000	USD
CY2017Q4	us-gaap	Income Loss From Discontinued Operations Net Of Tax Attributable To Reporting Entity IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity	2000000	USD
CY2017	us-gaap	Income Loss From Discontinued Operations Net Of Tax Attributable To Reporting Entity IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity	3000000	USD
CY2015	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Basic Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare	0.81
CY2016	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Basic Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare	-0.09
CY2017	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Basic Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare	0.01
CY2015	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Diluted Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare	0.81
CY2016	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Diluted Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare	-0.09
CY2017	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Diluted Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare	0.01
CY2015	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	52000000	USD
CY2016	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	18000000	USD
CY2017	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	14000000	USD
CY2015	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	496000000	USD
CY2016Q1	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	150000000	USD
CY2016Q2	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	56000000	USD
CY2016Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	130000000	USD
CY2016Q4	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	134000000	USD
CY2016	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	470000000	USD
CY2017Q1	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	113000000	USD
CY2017Q2	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	122000000	USD
CY2017Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	115000000	USD
CY2017Q4	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	231000000	USD
CY2017	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	581000000	USD
CY2015	us-gaap	Income Tax Reconciliation Change In Deferred Tax Assets Valuation Allowance IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	-25000000	USD
CY2016	us-gaap	Income Tax Reconciliation Change In Deferred Tax Assets Valuation Allowance IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	51000000	USD
CY2017	us-gaap	Income Tax Reconciliation Change In Deferred Tax Assets Valuation Allowance IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	-49000000	USD
CY2015	us-gaap	Income Tax Reconciliation Equity In Earnings Losses Of Unconsolidated Subsidiary IncomeTaxReconciliationEquityInEarningsLossesOfUnconsolidatedSubsidiary	-14000000	USD
CY2016	us-gaap	Income Tax Reconciliation Equity In Earnings Losses Of Unconsolidated Subsidiary IncomeTaxReconciliationEquityInEarningsLossesOfUnconsolidatedSubsidiary	-7000000	USD
CY2017	us-gaap	Income Tax Reconciliation Equity In Earnings Losses Of Unconsolidated Subsidiary IncomeTaxReconciliationEquityInEarningsLossesOfUnconsolidatedSubsidiary	-4000000	USD
CY2015	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	488000000	USD
CY2016	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	553000000	USD
CY2017	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	527000000	USD
CY2015	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	-1000000	USD
CY2016	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	0	USD
CY2017	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	-16000000	USD
CY2015	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	38000000	USD
CY2016	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	35000000	USD
CY2017	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	7000000	USD
CY2015	us-gaap	Income Tax Reconciliation Tax Credits IncomeTaxReconciliationTaxCredits	13000000	USD
CY2016	us-gaap	Income Tax Reconciliation Tax Credits IncomeTaxReconciliationTaxCredits	15000000	USD
CY2017	us-gaap	Income Tax Reconciliation Tax Credits IncomeTaxReconciliationTaxCredits	12000000	USD
CY2015	us-gaap	Income Taxes Paid IncomeTaxesPaid	96000000	USD
CY2016	us-gaap	Income Taxes Paid IncomeTaxesPaid	19000000	USD
CY2017	us-gaap	Income Taxes Paid IncomeTaxesPaid	51000000	USD
CY2015	us-gaap	Increase Decrease In Deferred Income Taxes IncreaseDecreaseInDeferredIncomeTaxes	-565000000	USD
CY2016	us-gaap	Increase Decrease In Deferred Income Taxes IncreaseDecreaseInDeferredIncomeTaxes	-458000000	USD
CY2017	us-gaap	Increase Decrease In Deferred Income Taxes IncreaseDecreaseInDeferredIncomeTaxes	-534000000	USD
CY2015	us-gaap	Increase Decrease In Deposits IncreaseDecreaseInDeposits	8247000000	USD
CY2016	us-gaap	Increase Decrease In Deposits IncreaseDecreaseInDeposits	12508000000	USD
CY2017	us-gaap	Increase Decrease In Deposits IncreaseDecreaseInDeposits	14172000000	USD
CY2015	us-gaap	Increase Decrease In Interest Payable Net IncreaseDecreaseInInterestPayableNet	-127000000	USD
CY2016	us-gaap	Increase Decrease In Interest Payable Net IncreaseDecreaseInInterestPayableNet	1000000	USD
CY2017	us-gaap	Increase Decrease In Interest Payable Net IncreaseDecreaseInInterestPayableNet	24000000	USD
CY2015	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	-526000000	USD
CY2016	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	120000000	USD
CY2017	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	153000000	USD
CY2016	us-gaap	Insurance Services Revenue InsuranceServicesRevenue	945000000	USD
CY2015	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	3000000000	USD
CY2016	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	2990000000	USD
CY2017	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	3073000000	USD
CY2015	us-gaap	Interest Income Securities Taxable InterestIncomeSecuritiesTaxable	340000000	USD
CY2017	us-gaap	Insurance Services Revenue InsuranceServicesRevenue	973000000	USD
CY2015	us-gaap	Interest And Dividend Income Securities InterestAndDividendIncomeSecurities	381000000	USD
CY2016	us-gaap	Interest And Dividend Income Securities InterestAndDividendIncomeSecurities	418000000	USD
CY2017	us-gaap	Interest And Dividend Income Securities InterestAndDividendIncomeSecurities	599000000	USD
CY2016	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	-160000000	USD
CY2017	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	-74000000	USD
CY2015	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	-247000000	USD
CY2016	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	-206000000	USD
CY2017	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	-69000000	USD
CY2015	us-gaap	Insurance Commissions InsuranceCommissions	378000000	USD
CY2016	us-gaap	Insurance Commissions InsuranceCommissions	389000000	USD
CY2017	us-gaap	Insurance Commissions InsuranceCommissions	415000000	USD
CY2015	us-gaap	Insurance Services Revenue InsuranceServicesRevenue	940000000	USD
CY2015	us-gaap	Interest And Dividend Income Securities Available For Sale InterestAndDividendIncomeSecuritiesAvailableForSale	381000000	USD
CY2016	us-gaap	Interest And Dividend Income Securities Available For Sale InterestAndDividendIncomeSecuritiesAvailableForSale	418000000	USD
CY2017	us-gaap	Interest And Dividend Income Securities Available For Sale InterestAndDividendIncomeSecuritiesAvailableForSale	599000000	USD
CY2015	us-gaap	Interest And Fee Income Loans And Leases InterestAndFeeIncomeLoansAndLeases	4570000000	USD
CY2016	us-gaap	Interest And Fee Income Loans And Leases InterestAndFeeIncomeLoansAndLeases	5162000000	USD
CY2017	us-gaap	Interest And Fee Income Loans And Leases InterestAndFeeIncomeLoansAndLeases	5819000000	USD
CY2015	us-gaap	Interest And Fee Income Loans And Leases Held For Sale InterestAndFeeIncomeLoansAndLeasesHeldForSale	40000000	USD
CY2016	us-gaap	Interest And Fee Income Loans And Leases Held For Sale InterestAndFeeIncomeLoansAndLeasesHeldForSale	0	USD
CY2017	us-gaap	Interest And Fee Income Loans And Leases Held For Sale InterestAndFeeIncomeLoansAndLeasesHeldForSale	0	USD
CY2016Q4	us-gaap	Interest Bearing Deposit Liabilities InterestBearingDepositLiabilities	78938000000	USD
CY2017Q4	us-gaap	Interest Bearing Deposit Liabilities InterestBearingDepositLiabilities	93148000000	USD
CY2016Q4	us-gaap	Interest Bearing Deposits In Banks InterestBearingDepositsInBanks	4387000000	USD
CY2017Q4	us-gaap	Interest Bearing Deposits In Banks InterestBearingDepositsInBanks	3408000000	USD
CY2015	us-gaap	Interest Expense InterestExpense	2429000000	USD
CY2016	us-gaap	Interest Expense InterestExpense	2629000000	USD
CY2017	us-gaap	Interest Expense InterestExpense	2857000000	USD
CY2015	us-gaap	Interest Expense Deposits InterestExpenseDeposits	718000000	USD
CY2016	us-gaap	Interest Expense Deposits InterestExpenseDeposits	830000000	USD
CY2017	us-gaap	Interest Expense Deposits InterestExpenseDeposits	1077000000	USD
CY2015	us-gaap	Interest Expense Long Term Debt InterestExpenseLongTermDebt	1662000000	USD
CY2016	us-gaap	Interest Expense Long Term Debt InterestExpenseLongTermDebt	1742000000	USD
CY2017	us-gaap	Interest Expense Long Term Debt InterestExpenseLongTermDebt	1653000000	USD
CY2015	us-gaap	Interest Expense Related Party InterestExpenseRelatedParty	0	USD
CY2016	us-gaap	Interest Expense Related Party InterestExpenseRelatedParty	0	USD
CY2017	us-gaap	Interest Expense Related Party InterestExpenseRelatedParty	0	USD
CY2015	us-gaap	Interest Expense Short Term Borrowings InterestExpenseShortTermBorrowings	49000000	USD
CY2016	us-gaap	Interest Expense Short Term Borrowings InterestExpenseShortTermBorrowings	57000000	USD
CY2017	us-gaap	Interest Expense Short Term Borrowings InterestExpenseShortTermBorrowings	127000000	USD
CY2015	us-gaap	Interest Income Deposits With Financial Institutions InterestIncomeDepositsWithFinancialInstitutions	8000000	USD
CY2016	us-gaap	Interest Income Deposits With Financial Institutions InterestIncomeDepositsWithFinancialInstitutions	14000000	USD
CY2017	us-gaap	Interest Income Deposits With Financial Institutions InterestIncomeDepositsWithFinancialInstitutions	37000000	USD
CY2017	us-gaap	Labor And Related Expense LaborAndRelatedExpense	1095000000	USD
CY2017Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal After Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive	6995000000	USD
CY2017Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Next Twelve Months LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths	10981000000	USD
CY2016	us-gaap	Interest Income Securities Taxable InterestIncomeSecuritiesTaxable	375000000	USD
CY2017	us-gaap	Interest Income Securities Taxable InterestIncomeSecuritiesTaxable	534000000	USD
CY2015	us-gaap	Interest Paid InterestPaid	2632000000	USD
CY2016	us-gaap	Interest Paid InterestPaid	2647000000	USD
CY2017	us-gaap	Interest Paid InterestPaid	2829000000	USD
CY2016Q4	us-gaap	Interest Payable Current And Noncurrent InterestPayableCurrentAndNoncurrent	351000000	USD
CY2017Q4	us-gaap	Interest Payable Current And Noncurrent InterestPayableCurrentAndNoncurrent	375000000	USD
CY2016Q4	us-gaap	Interest Receivable InterestReceivable	476000000	USD
CY2017Q4	us-gaap	Interest Receivable InterestReceivable	550000000	USD
CY2015	us-gaap	Labor And Related Expense LaborAndRelatedExpense	963000000	USD
CY2016	us-gaap	Labor And Related Expense LaborAndRelatedExpense	992000000	USD
CY2015	us-gaap	Lease And Rental Expense LeaseAndRentalExpense	51000000	USD
CY2016	us-gaap	Lease And Rental Expense LeaseAndRentalExpense	51000000	USD
CY2017	us-gaap	Lease And Rental Expense LeaseAndRentalExpense	46000000	USD
CY2016Q4	us-gaap	Liabilities Liabilities	150411000000	USD
CY2017Q4	us-gaap	Liabilities Liabilities	153654000000	USD
CY2016Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	163728000000	USD
CY2017Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	167148000000	USD
CY2015Q4	us-gaap	Liability For Claims And Claims Adjustment Expense LiabilityForClaimsAndClaimsAdjustmentExpense	169000000	USD
CY2016Q4	us-gaap	Liability For Claims And Claims Adjustment Expense LiabilityForClaimsAndClaimsAdjustmentExpense	149000000	USD
CY2017Q4	us-gaap	Liability For Claims And Claims Adjustment Expense LiabilityForClaimsAndClaimsAdjustmentExpense	140000000	USD
CY2016	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Claims Paid Current Year1 LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidCurrentYear1	320000000	USD
CY2017	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Claims Paid Current Year1 LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidCurrentYear1	309000000	USD
CY2016	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Claims Paid Prior Years1 LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidPriorYears1	30000000	USD
CY2017	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Claims Paid Prior Years1 LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidPriorYears1	32000000	USD
CY2015	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Incurred Claims1 LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaims1	293000000	USD
CY2016	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Incurred Claims1 LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaims1	342000000	USD
CY2017	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Incurred Claims1 LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaims1	332000000	USD
CY2015Q4	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Net LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNet	49000000	USD
CY2016Q4	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Net LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNet	41000000	USD
CY2017Q4	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Net LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNet	32000000	USD
CY2016Q4	us-gaap	Loans And Leases Receivable Gross Carrying Amount LoansAndLeasesReceivableGrossCarryingAmount	118944000000	USD
CY2017Q4	us-gaap	Loans And Leases Receivable Gross Carrying Amount LoansAndLeasesReceivableGrossCarryingAmount	122893000000	USD
CY2016Q4	us-gaap	Loans And Leases Receivable Net Of Deferred Income LoansAndLeasesReceivableNetOfDeferredIncome	118944000000	USD
CY2017Q4	us-gaap	Loans And Leases Receivable Net Of Deferred Income LoansAndLeasesReceivableNetOfDeferredIncome	122893000000	USD
CY2016Q4	us-gaap	Loans And Leases Receivable Net Reported Amount LoansAndLeasesReceivableNetReportedAmount	117800000000	USD
CY2017Q4	us-gaap	Loans And Leases Receivable Net Reported Amount LoansAndLeasesReceivableNetReportedAmount	121617000000	USD
CY2016Q4	us-gaap	Loans Receivable Held For Sale Net Not Part Of Disposal Group LoansReceivableHeldForSaleNetNotPartOfDisposalGroup	0	USD
CY2017Q4	us-gaap	Loans Receivable Held For Sale Net Not Part Of Disposal Group LoansReceivableHeldForSaleNetNotPartOfDisposalGroup	108000000	USD
CY2016Q4	us-gaap	Long Term Debt LongTermDebt	54128000000	USD
CY2017Q4	us-gaap	Long Term Debt LongTermDebt	44226000000	USD
CY2016Q4	us-gaap	Long Term Debt Current LongTermDebtCurrent	14553000000	USD
CY2017Q4	us-gaap	Long Term Debt Current LongTermDebtCurrent	10981000000	USD
CY2017Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive	2651000000	USD
CY2017Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Four LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour	4306000000	USD
CY2017Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Three LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree	9091000000	USD
CY2017Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Two LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo	9994000000	USD
CY2016Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	39260000000	USD
CY2017Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	33037000000	USD
CY2015	us-gaap	Marketing And Advertising Expense MarketingAndAdvertisingExpense	107000000	USD
CY2016	us-gaap	Marketing And Advertising Expense MarketingAndAdvertisingExpense	112000000	USD
CY2017	us-gaap	Marketing And Advertising Expense MarketingAndAdvertisingExpense	133000000	USD
CY2015	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	5444000000	USD
CY2016	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	3670000000	USD
CY2017	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	2033000000	USD
CY2015	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-10003000000	USD
CY2016	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-9070000000	USD
CY2017	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-8727000000	USD
CY2015	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	5111000000	USD
CY2016	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	4567000000	USD
CY2017	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	4079000000	USD
CY2016	us-gaap	Net Credit Loss On Loans Managed Or Securitized Or Assetbacked Financing Arrangement NetCreditLossOnLoansManagedOrSecuritizedOrAssetbackedFinancingArrangement	11000000	USD
CY2017	us-gaap	Net Credit Loss On Loans Managed Or Securitized Or Assetbacked Financing Arrangement NetCreditLossOnLoansManagedOrSecuritizedOrAssetbackedFinancingArrangement	16000000	USD
CY2015	us-gaap	Net Income Loss NetIncomeLoss	1289000000	USD
CY2016Q1	us-gaap	Net Income Loss NetIncomeLoss	250000000	USD
CY2016Q2	us-gaap	Net Income Loss NetIncomeLoss	360000000	USD
CY2016Q3	us-gaap	Net Income Loss NetIncomeLoss	209000000	USD
CY2016Q4	us-gaap	Net Income Loss NetIncomeLoss	248000000	USD
CY2016	us-gaap	Net Income Loss NetIncomeLoss	1067000000	USD
CY2017Q1	us-gaap	Net Income Loss NetIncomeLoss	214000000	USD
CY2017Q2	us-gaap	Net Income Loss NetIncomeLoss	252000000	USD
CY2017Q3	us-gaap	Net Income Loss NetIncomeLoss	282000000	USD
CY2017Q4	us-gaap	Net Income Loss NetIncomeLoss	181000000	USD
CY2017	us-gaap	Net Income Loss NetIncomeLoss	929000000	USD
CY2015	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	-1282000000	USD
CY2016	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	1037000000	USD
CY2017	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	929000000	USD
CY2015	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	-1282000000	USD
CY2016	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	1037000000	USD
CY2017	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	929000000	USD
CY2015	us-gaap	Net Income Loss From Continuing Operations Available To Common Shareholders Basic NetIncomeLossFromContinuingOperationsAvailableToCommonShareholdersBasic	-1674000000	USD
CY2016	us-gaap	Net Income Loss From Continuing Operations Available To Common Shareholders Basic NetIncomeLossFromContinuingOperationsAvailableToCommonShareholdersBasic	1081000000	USD
CY2017	us-gaap	Net Income Loss From Continuing Operations Available To Common Shareholders Basic NetIncomeLossFromContinuingOperationsAvailableToCommonShareholdersBasic	926000000	USD
CY2015	us-gaap	Net Income Loss From Continuing Operations Available To Common Shareholders Diluted NetIncomeLossFromContinuingOperationsAvailableToCommonShareholdersDiluted	-1674000000	USD
CY2016	us-gaap	Net Income Loss From Continuing Operations Available To Common Shareholders Diluted NetIncomeLossFromContinuingOperationsAvailableToCommonShareholdersDiluted	1081000000	USD
CY2017	us-gaap	Net Income Loss From Continuing Operations Available To Common Shareholders Diluted NetIncomeLossFromContinuingOperationsAvailableToCommonShareholdersDiluted	926000000	USD
CY2015	us-gaap	Net Income Loss From Discontinued Operations Available To Common Shareholders Diluted NetIncomeLossFromDiscontinuedOperationsAvailableToCommonShareholdersDiluted	392000000	USD
CY2016	us-gaap	Net Income Loss From Discontinued Operations Available To Common Shareholders Diluted NetIncomeLossFromDiscontinuedOperationsAvailableToCommonShareholdersDiluted	-44000000	USD
CY2017	us-gaap	Net Income Loss From Discontinued Operations Available To Common Shareholders Diluted NetIncomeLossFromDiscontinuedOperationsAvailableToCommonShareholdersDiluted	3000000	USD
CY2015Q4	us-gaap	Noncurrent Assets NoncurrentAssets	16506000000	USD
CY2016Q4	us-gaap	Noncurrent Assets NoncurrentAssets	11846000000	USD
CY2017Q4	us-gaap	Noncurrent Assets NoncurrentAssets	9197000000	USD
CY2016Q4	us-gaap	Noninterest Bearing Deposit Liabilities NoninterestBearingDepositLiabilities	84000000	USD
CY2017Q4	us-gaap	Noninterest Bearing Deposit Liabilities NoninterestBearingDepositLiabilities	108000000	USD
CY2015	us-gaap	Noninterest Expense NoninterestExpense	2761000000	USD
CY2016Q1	us-gaap	Noninterest Expense NoninterestExpense	710000000	USD
CY2016Q2	us-gaap	Noninterest Expense NoninterestExpense	773000000	USD
CY2016Q3	us-gaap	Noninterest Expense NoninterestExpense	735000000	USD
CY2016Q4	us-gaap	Noninterest Expense NoninterestExpense	721000000	USD
CY2016	us-gaap	Noninterest Expense NoninterestExpense	2939000000	USD
CY2017Q1	us-gaap	Noninterest Expense NoninterestExpense	778000000	USD
CY2017Q2	us-gaap	Noninterest Expense NoninterestExpense	810000000	USD
CY2017Q3	us-gaap	Noninterest Expense NoninterestExpense	753000000	USD
CY2017Q4	us-gaap	Noninterest Expense NoninterestExpense	769000000	USD
CY2017	us-gaap	Noninterest Expense NoninterestExpense	3110000000	USD
CY2015	us-gaap	Noninterest Income Other Operating Income NoninterestIncomeOtherOperatingIncome	359000000	USD
CY2016	us-gaap	Noninterest Income Other Operating Income NoninterestIncomeOtherOperatingIncome	394000000	USD
CY2017	us-gaap	Noninterest Income Other Operating Income NoninterestIncomeOtherOperatingIncome	408000000	USD
CY2015	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	1142000000	USD
CY2016Q1	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	376000000	USD
CY2016Q2	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	374000000	USD
CY2016Q3	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	388000000	USD
CY2016Q4	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	392000000	USD
CY2016	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	1530000000	USD
CY2017Q1	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	396000000	USD
CY2017Q2	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	388000000	USD
CY2017Q3	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	381000000	USD
CY2017Q4	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	379000000	USD
CY2017	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	1544000000	USD
CY2015	us-gaap	Occupancy Net OccupancyNet	50000000	USD
CY2016	us-gaap	Occupancy Net OccupancyNet	51000000	USD
CY2017	us-gaap	Occupancy Net OccupancyNet	46000000	USD
CY2017Q4	us-gaap	Operating Leases Future Minimum Payments Due OperatingLeasesFutureMinimumPaymentsDue	489000000	USD
CY2017Q4	us-gaap	Operating Leases Future Minimum Payments Due Current OperatingLeasesFutureMinimumPaymentsDueCurrent	35000000	USD
CY2017Q4	us-gaap	Operating Leases Future Minimum Payments Due In Five Years OperatingLeasesFutureMinimumPaymentsDueInFiveYears	33000000	USD
CY2017Q4	us-gaap	Operating Leases Future Minimum Payments Due In Four Years OperatingLeasesFutureMinimumPaymentsDueInFourYears	36000000	USD
CY2017Q4	us-gaap	Operating Leases Future Minimum Payments Due In Three Years OperatingLeasesFutureMinimumPaymentsDueInThreeYears	34000000	USD
CY2017Q4	us-gaap	Operating Leases Future Minimum Payments Due In Two Years OperatingLeasesFutureMinimumPaymentsDueInTwoYears	35000000	USD
CY2017Q4	us-gaap	Operating Leases Future Minimum Payments Due Thereafter OperatingLeasesFutureMinimumPaymentsDueThereafter	316000000	USD
CY2017Q4	us-gaap	Operating Leases Future Minimum Payments Receivable OperatingLeasesFutureMinimumPaymentsReceivable	2572000000	USD
CY2017Q4	us-gaap	Operating Leases Future Minimum Payments Receivable Current OperatingLeasesFutureMinimumPaymentsReceivableCurrent	1319000000	USD
CY2017	us-gaap	Proceeds From Sale Of Loans Held For Investment ProceedsFromSaleOfLoansHeldForInvestment	1339000000	USD
CY2015	us-gaap	Proceeds From Sale Of Loans Held For Sale ProceedsFromSaleOfLoansHeldForSale	1658000000	USD
CY2016	us-gaap	Proceeds From Sale Of Loans Held For Sale ProceedsFromSaleOfLoansHeldForSale	240000000	USD
CY2017Q4	us-gaap	Operating Leases Future Minimum Payments Receivable In Four Years OperatingLeasesFutureMinimumPaymentsReceivableInFourYears	46000000	USD
CY2017Q4	us-gaap	Operating Leases Future Minimum Payments Receivable In Three Years OperatingLeasesFutureMinimumPaymentsReceivableInThreeYears	364000000	USD
CY2017Q4	us-gaap	Operating Leases Future Minimum Payments Receivable In Two Years OperatingLeasesFutureMinimumPaymentsReceivableInTwoYears	839000000	USD
CY2017Q4	us-gaap	Operating Leases Future Minimum Payments Receivable Thereafter OperatingLeasesFutureMinimumPaymentsReceivableThereafter	4000000	USD
CY2015	us-gaap	Operating Leases Income Statement Depreciation Expense On Property Subject To Or Held For Lease OperatingLeasesIncomeStatementDepreciationExpenseOnPropertySubjectToOrHeldForLease	2249000000	USD
CY2016	us-gaap	Operating Leases Income Statement Depreciation Expense On Property Subject To Or Held For Lease OperatingLeasesIncomeStatementDepreciationExpenseOnPropertySubjectToOrHeldForLease	1769000000	USD
CY2017	us-gaap	Operating Leases Income Statement Depreciation Expense On Property Subject To Or Held For Lease OperatingLeasesIncomeStatementDepreciationExpenseOnPropertySubjectToOrHeldForLease	1244000000	USD
CY2015	us-gaap	Operating Leases Income Statement Lease Revenue OperatingLeasesIncomeStatementLeaseRevenue	3398000000	USD
CY2016	us-gaap	Operating Leases Income Statement Lease Revenue OperatingLeasesIncomeStatementLeaseRevenue	2711000000	USD
CY2017	us-gaap	Operating Leases Income Statement Lease Revenue OperatingLeasesIncomeStatementLeaseRevenue	1867000000	USD
CY2017Q4	us-gaap	Operating Loss Carryforwards Valuation Allowance OperatingLossCarryforwardsValuationAllowance	0	USD
CY2016Q4	us-gaap	Other Accrued Liabilities Current And Noncurrent OtherAccruedLiabilitiesCurrentAndNoncurrent	546000000	USD
CY2017Q4	us-gaap	Other Accrued Liabilities Current And Noncurrent OtherAccruedLiabilitiesCurrentAndNoncurrent	556000000	USD
CY2016Q4	us-gaap	Other Assets OtherAssets	6854000000	USD
CY2017Q4	us-gaap	Other Assets OtherAssets	5663000000	USD
CY2016Q4	us-gaap	Other Assets Miscellaneous OtherAssetsMiscellaneous	1371000000	USD
CY2017Q4	us-gaap	Other Assets Miscellaneous OtherAssetsMiscellaneous	1522000000	USD
CY2017Q4	us-gaap	Other Commitment OtherCommitment	123000000	USD
CY2017Q4	us-gaap	Other Commitment Due In Fourth Year OtherCommitmentDueInFourthYear	2000000	USD
CY2017Q4	us-gaap	Other Commitment Due In Next Twelve Months OtherCommitmentDueInNextTwelveMonths	85000000	USD
CY2017Q4	us-gaap	Other Commitment Due In Second And Third Year OtherCommitmentDueInSecondAndThirdYear	36000000	USD
CY2015	us-gaap	Other Comprehensive Income Defined Benefit Plans Net Unamortized Gain Loss Arising During Period Tax OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodTax	0	USD
CY2016	us-gaap	Other Comprehensive Income Defined Benefit Plans Net Unamortized Gain Loss Arising During Period Tax OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodTax	-2000000	USD
CY2017	us-gaap	Other Comprehensive Income Defined Benefit Plans Net Unamortized Gain Loss Arising During Period Tax OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodTax	0	USD
CY2015	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Gain Loss Arising During Period Net Of Tax OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax	-48000000	USD
CY2016	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Gain Loss Arising During Period Net Of Tax OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax	4000000	USD
CY2017	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Gain Loss Arising During Period Net Of Tax OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax	8000000	USD
CY2015	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Before Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeTax	-220000000	USD
CY2016	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Before Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeTax	-172000000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Before Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeTax	132000000	USD
CY2015	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	-138000000	USD
CY2016	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	-114000000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	100000000	USD
CY2015	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesTax	-82000000	USD
CY2016	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesTax	-58000000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesTax	32000000	USD
CY2015	us-gaap	Other Comprehensive Income Loss Before Tax OtherComprehensiveIncomeLossBeforeTax	-267000000	USD
CY2016	us-gaap	Other Comprehensive Income Loss Before Tax OtherComprehensiveIncomeLossBeforeTax	-166000000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Before Tax OtherComprehensiveIncomeLossBeforeTax	140000000	USD
CY2015	us-gaap	Other Comprehensive Income Loss Derivatives Qualifying As Hedges Net Of Tax OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax	1000000	USD
CY2016	us-gaap	Other Comprehensive Income Loss Derivatives Qualifying As Hedges Net Of Tax OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax	0	USD
CY2017	us-gaap	Other Comprehensive Income Loss Derivatives Qualifying As Hedges Net Of Tax OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax	3000000	USD
CY2015	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Before Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentBeforeTax	-81000000	USD
CY2016	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Before Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentBeforeTax	6000000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Before Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentBeforeTax	12000000	USD
CY2016	us-gaap	Payments Of Dividends PaymentsOfDividends	108000000	USD
CY2017	us-gaap	Payments Of Dividends PaymentsOfDividends	184000000	USD
CY2015	us-gaap	Payments To Acquire Available For Sale Securities PaymentsToAcquireAvailableForSaleSecurities	12250000000	USD
CY2016	us-gaap	Payments To Acquire Available For Sale Securities PaymentsToAcquireAvailableForSaleSecurities	16031000000	USD
CY2017	us-gaap	Payments To Acquire Available For Sale Securities PaymentsToAcquireAvailableForSaleSecurities	11234000000	USD
CY2015	us-gaap	Payments To Acquire Held To Maturity Securities PaymentsToAcquireHeldToMaturitySecurities	0	USD
CY2015	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	-27000000	USD
CY2016	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	5000000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	2000000	USD
CY2015	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Reclassification Adjustment From Aoci Realized Upon Sale Or Liquidation Before Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationReclassificationAdjustmentFromAOCIRealizedUponSaleOrLiquidationBeforeTax	42000000	USD
CY2016	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Reclassification Adjustment From Aoci Realized Upon Sale Or Liquidation Before Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationReclassificationAdjustmentFromAOCIRealizedUponSaleOrLiquidationBeforeTax	-1000000	USD
CY2015	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Reclassification Adjustment From Aoci Realized Upon Sale Or Liquidation Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationReclassificationAdjustmentFromAOCIRealizedUponSaleOrLiquidationNetOfTax	22000000	USD
CY2016	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Reclassification Adjustment From Aoci Realized Upon Sale Or Liquidation Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationReclassificationAdjustmentFromAOCIRealizedUponSaleOrLiquidationNetOfTax	-1000000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Reclassification Adjustment From Aoci Realized Upon Sale Or Liquidation Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationReclassificationAdjustmentFromAOCIRealizedUponSaleOrLiquidationNetOfTax	0	USD
CY2015	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Reclassification Adjustment From Aoci Realized Upon Sale Or Liquidation Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationReclassificationAdjustmentFromAOCIRealizedUponSaleOrLiquidationTax	20000000	USD
CY2016	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Reclassification Adjustment From Aoci Realized Upon Sale Or Liquidation Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationReclassificationAdjustmentFromAOCIRealizedUponSaleOrLiquidationTax	0	USD
CY2015	us-gaap	Other Comprehensive Income Loss Foreign Currency Translation Adjustment Tax OtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentTax	-33000000	USD
CY2016	us-gaap	Other Comprehensive Income Loss Foreign Currency Translation Adjustment Tax OtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentTax	2000000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Foreign Currency Translation Adjustment Tax OtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentTax	4000000	USD
CY2015	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-165000000	USD
CY2016	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-110000000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	106000000	USD
CY2015	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-165000000	USD
CY2016	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-110000000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	106000000	USD
CY2015	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Before Reclassification Adjustments Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeReclassificationAdjustmentsNetOfTax	0	USD
CY2016	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Before Reclassification Adjustments Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeReclassificationAdjustmentsNetOfTax	3000000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Before Reclassification Adjustments Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeReclassificationAdjustmentsNetOfTax	-1000000	USD
CY2015	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Before Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeTax	1000000	USD
CY2016	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Before Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeTax	1000000	USD
CY2015	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	1000000	USD
CY2016	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	1000000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	-1000000	USD
CY2015	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Net Unamortized Gain Loss Arising During Period Before Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansNetUnamortizedGainLossArisingDuringPeriodBeforeTax	0	USD
CY2016	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Net Unamortized Gain Loss Arising During Period Before Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansNetUnamortizedGainLossArisingDuringPeriodBeforeTax	-5000000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Net Unamortized Gain Loss Arising During Period Before Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansNetUnamortizedGainLossArisingDuringPeriodBeforeTax	1000000	USD
CY2015	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax	0	USD
CY2016	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax	0	USD
CY2015	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax	155000000	USD
CY2016	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax	185000000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax	105000000	USD
CY2015	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax	99000000	USD
CY2016	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax	147000000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax	92000000	USD
CY2015	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax	56000000	USD
CY2016	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax	38000000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax	13000000	USD
CY2015	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Gain Loss Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossBeforeTax	1000000	USD
CY2016	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Gain Loss Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossBeforeTax	-4000000	USD
CY2015	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Gain Loss Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax	1000000	USD
CY2016	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Gain Loss Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax	-2000000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Gain Loss Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax	0	USD
CY2015	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansTax	0	USD
CY2016	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansTax	2000000	USD
CY2015	us-gaap	Other Comprehensive Income Loss Tax OtherComprehensiveIncomeLossTax	-102000000	USD
CY2016	us-gaap	Other Comprehensive Income Loss Tax OtherComprehensiveIncomeLossTax	-56000000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Tax OtherComprehensiveIncomeLossTax	34000000	USD
CY2015	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodBeforeTax	2000000	USD
CY2017	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodBeforeTax	5000000	USD
CY2015	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax	1000000	USD
CY2017	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax	2000000	USD
CY2015	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	-65000000	USD
CY2016	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	13000000	USD
CY2017	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	237000000	USD
CY2015	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	-39000000	USD
CY2016	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	33000000	USD
CY2017	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	192000000	USD
CY2015	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	-26000000	USD
CY2016	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	-20000000	USD
CY2017	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	45000000	USD
CY2015	us-gaap	Other Cost And Expense Operating OtherCostAndExpenseOperating	216000000	USD
CY2016	us-gaap	Other Cost And Expense Operating OtherCostAndExpenseOperating	242000000	USD
CY2017	us-gaap	Other Cost And Expense Operating OtherCostAndExpenseOperating	200000000	USD
CY2015	us-gaap	Other Income OtherIncome	71000000	USD
CY2016	us-gaap	Other Income OtherIncome	111000000	USD
CY2017	us-gaap	Other Income OtherIncome	137000000	USD
CY2015	us-gaap	Other Noninterest Expense OtherNoninterestExpense	1505000000	USD
CY2016	us-gaap	Other Noninterest Expense OtherNoninterestExpense	1605000000	USD
CY2017	us-gaap	Other Noninterest Expense OtherNoninterestExpense	1683000000	USD
CY2015	us-gaap	Other Than Temporary Impairment Losses Investments Portion Recognized In Earnings Net OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNet	14000000	USD
CY2016	us-gaap	Other Than Temporary Impairment Losses Investments Portion Recognized In Earnings Net OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNet	0	USD
CY2017	us-gaap	Other Than Temporary Impairment Losses Investments Portion Recognized In Earnings Net OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNet	0	USD
CY2016	us-gaap	Payments For Losses And Loss Adjustment Expense PaymentsForLossesAndLossAdjustmentExpense	350000000	USD
CY2017	us-gaap	Payments For Losses And Loss Adjustment Expense PaymentsForLossesAndLossAdjustmentExpense	341000000	USD
CY2015	us-gaap	Payments For Origination And Purchases Of Loans Held For Sale PaymentsForOriginationAndPurchasesOfLoansHeldForSale	1770000000	USD
CY2016	us-gaap	Payments For Origination And Purchases Of Loans Held For Sale PaymentsForOriginationAndPurchasesOfLoansHeldForSale	141000000	USD
CY2017	us-gaap	Payments For Origination And Purchases Of Loans Held For Sale PaymentsForOriginationAndPurchasesOfLoansHeldForSale	414000000	USD
CY2015	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	-3000000	USD
CY2016	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	306000000	USD
CY2017	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	219000000	USD
CY2015	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	16000000	USD
CY2016	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	341000000	USD
CY2017	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	753000000	USD
CY2015	us-gaap	Payments For Repurchase Of Redeemable Preferred Stock PaymentsForRepurchaseOfRedeemablePreferredStock	559000000	USD
CY2016	us-gaap	Payments For Repurchase Of Redeemable Preferred Stock PaymentsForRepurchaseOfRedeemablePreferredStock	696000000	USD
CY2017	us-gaap	Payments For Repurchase Of Redeemable Preferred Stock PaymentsForRepurchaseOfRedeemablePreferredStock	0	USD
CY2015	us-gaap	Payments Of Dividends PaymentsOfDividends	2571000000	USD
CY2016	us-gaap	Payments To Acquire Held To Maturity Securities PaymentsToAcquireHeldToMaturitySecurities	841000000	USD
CY2017	us-gaap	Payments To Acquire Held To Maturity Securities PaymentsToAcquireHeldToMaturitySecurities	1026000000	USD
CY2015	us-gaap	Payments To Acquire Interest In Subsidiaries And Affiliates PaymentsToAcquireInterestInSubsidiariesAndAffiliates	0	USD
CY2016	us-gaap	Payments To Acquire Interest In Subsidiaries And Affiliates PaymentsToAcquireInterestInSubsidiariesAndAffiliates	309000000	USD
CY2017	us-gaap	Payments To Acquire Interest In Subsidiaries And Affiliates PaymentsToAcquireInterestInSubsidiariesAndAffiliates	0	USD
CY2015	us-gaap	Payments To Acquire Loans Held For Investment PaymentsToAcquireLoansHeldForInvestment	4501000000	USD
CY2016	us-gaap	Payments To Acquire Loans Held For Investment PaymentsToAcquireLoansHeldForInvestment	3859000000	USD
CY2017	us-gaap	Payments To Acquire Loans Held For Investment PaymentsToAcquireLoansHeldForInvestment	5452000000	USD
CY2016Q4	us-gaap	Pledged Assets Not Separately Reported On Statement Of Financial Position PledgedAssetsNotSeparatelyReportedOnStatementOfFinancialPosition	65222000000	USD
CY2017Q4	us-gaap	Pledged Assets Not Separately Reported On Statement Of Financial Position PledgedAssetsNotSeparatelyReportedOnStatementOfFinancialPosition	58761000000	USD
CY2016Q4	us-gaap	Pledged Financial Instruments Not Separately Reported Other Debt Securities Available For Sale Or Held For Investment PledgedFinancialInstrumentsNotSeparatelyReportedOtherDebtSecuritiesAvailableForSaleOrHeldForInvestment	4895000000	USD
CY2017Q4	us-gaap	Pledged Financial Instruments Not Separately Reported Other Debt Securities Available For Sale Or Held For Investment PledgedFinancialInstrumentsNotSeparatelyReportedOtherDebtSecuritiesAvailableForSaleOrHeldForInvestment	8371000000	USD
CY2017Q4	us-gaap	Preferred Stock Liquidation Preference PreferredStockLiquidationPreference	25
CY2016Q4	us-gaap	Premiums Receivable At Carrying Value PremiumsReceivableAtCarryingValue	80000000	USD
CY2017Q4	us-gaap	Premiums Receivable At Carrying Value PremiumsReceivableAtCarryingValue	84000000	USD
CY2016Q4	us-gaap	Prepaid Reinsurance Premiums PrepaidReinsurancePremiums	439000000	USD
CY2017Q4	us-gaap	Prepaid Reinsurance Premiums PrepaidReinsurancePremiums	507000000	USD
CY2016Q4	us-gaap	Principal Amount Outstanding On Loans Managed And Securitized PrincipalAmountOutstandingOnLoansManagedAndSecuritized	5556000000	USD
CY2017Q4	us-gaap	Principal Amount Outstanding On Loans Managed And Securitized PrincipalAmountOutstandingOnLoansManagedAndSecuritized	3363000000	USD
CY2015	us-gaap	Proceeds From Contributions From Parent ProceedsFromContributionsFromParent	0	USD
CY2016	us-gaap	Proceeds From Contributions From Parent ProceedsFromContributionsFromParent	0	USD
CY2017	us-gaap	Proceeds From Contributions From Parent ProceedsFromContributionsFromParent	0	USD
CY2015	us-gaap	Proceeds From Divestiture Of Businesses ProceedsFromDivestitureOfBusinesses	1049000000	USD
CY2016	us-gaap	Proceeds From Divestiture Of Businesses ProceedsFromDivestitureOfBusinesses	0	USD
CY2017	us-gaap	Proceeds From Divestiture Of Businesses ProceedsFromDivestitureOfBusinesses	0	USD
CY2015	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	30665000000	USD
CY2016	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	14155000000	USD
CY2017	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	17969000000	USD
CY2015	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	4255000000	USD
CY2016	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	3379000000	USD
CY2017	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	2899000000	USD
CY2015	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	1028000000	USD
CY2016	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	4564000000	USD
CY2017	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	-1263000000	USD
CY2015	us-gaap	Proceeds From Sale And Maturity Of Held To Maturity Securities ProceedsFromSaleAndMaturityOfHeldToMaturitySecurities	0	USD
CY2016	us-gaap	Proceeds From Sale And Maturity Of Held To Maturity Securities ProceedsFromSaleAndMaturityOfHeldToMaturitySecurities	0	USD
CY2017	us-gaap	Proceeds From Sale And Maturity Of Held To Maturity Securities ProceedsFromSaleAndMaturityOfHeldToMaturitySecurities	68000000	USD
CY2015	us-gaap	Proceeds From Sale Of Available For Sale Securities ProceedsFromSaleOfAvailableForSaleSecurities	6874000000	USD
CY2016	us-gaap	Proceeds From Sale Of Available For Sale Securities ProceedsFromSaleOfAvailableForSaleSecurities	11036000000	USD
CY2017	us-gaap	Proceeds From Sale Of Available For Sale Securities ProceedsFromSaleOfAvailableForSaleSecurities	4633000000	USD
CY2015	us-gaap	Proceeds From Sale Of Loans And Leases Held For Investment ProceedsFromSaleOfLoansAndLeasesHeldForInvestment	3197000000	USD
CY2016	us-gaap	Proceeds From Sale Of Loans And Leases Held For Investment ProceedsFromSaleOfLoansAndLeasesHeldForInvestment	4285000000	USD
CY2017	us-gaap	Proceeds From Sale Of Loans And Leases Held For Investment ProceedsFromSaleOfLoansAndLeasesHeldForInvestment	1339000000	USD
CY2015	us-gaap	Proceeds From Sale Of Loans Held For Investment ProceedsFromSaleOfLoansHeldForInvestment	3197000000	USD
CY2016	us-gaap	Proceeds From Sale Of Loans Held For Investment ProceedsFromSaleOfLoansHeldForInvestment	4285000000	USD
CY2015	us-gaap	Sales Revenue Net SalesRevenueNet	4861000000	USD
CY2016Q1	us-gaap	Sales Revenue Net SalesRevenueNet	1327000000	USD
CY2016Q2	us-gaap	Sales Revenue Net SalesRevenueNet	1358000000	USD
CY2016Q3	us-gaap	Sales Revenue Net SalesRevenueNet	1384000000	USD
CY2017	us-gaap	Proceeds From Sale Of Loans Held For Sale ProceedsFromSaleOfLoansHeldForSale	310000000	USD
CY2015	us-gaap	Professional Fees ProfessionalFees	93000000	USD
CY2016	us-gaap	Professional Fees ProfessionalFees	103000000	USD
CY2017	us-gaap	Professional Fees ProfessionalFees	113000000	USD
CY2016Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	901000000	USD
CY2017Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	1064000000	USD
CY2016Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	376000000	USD
CY2017Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	456000000	USD
CY2016Q4	us-gaap	Property Subject To Or Available For Operating Lease Accumulated Depreciation PropertySubjectToOrAvailableForOperatingLeaseAccumulatedDepreciation	3114000000	USD
CY2017Q4	us-gaap	Property Subject To Or Available For Operating Lease Accumulated Depreciation PropertySubjectToOrAvailableForOperatingLeaseAccumulatedDepreciation	1815000000	USD
CY2016Q4	us-gaap	Property Subject To Or Available For Operating Lease Gross PropertySubjectToOrAvailableForOperatingLeaseGross	14584000000	USD
CY2017Q4	us-gaap	Property Subject To Or Available For Operating Lease Gross PropertySubjectToOrAvailableForOperatingLeaseGross	10556000000	USD
CY2016Q4	us-gaap	Property Subject To Or Available For Operating Lease Net PropertySubjectToOrAvailableForOperatingLeaseNet	11470000000	USD
CY2017Q4	us-gaap	Property Subject To Or Available For Operating Lease Net PropertySubjectToOrAvailableForOperatingLeaseNet	8741000000	USD
CY2015	us-gaap	Provision For Loan Losses Expensed ProvisionForLoanLossesExpensed	707000000	USD
CY2016Q1	us-gaap	Provision For Loan Losses Expensed ProvisionForLoanLossesExpensed	220000000	USD
CY2016Q2	us-gaap	Provision For Loan Losses Expensed ProvisionForLoanLossesExpensed	172000000	USD
CY2016Q3	us-gaap	Provision For Loan Losses Expensed ProvisionForLoanLossesExpensed	258000000	USD
CY2016Q4	us-gaap	Provision For Loan Losses Expensed ProvisionForLoanLossesExpensed	267000000	USD
CY2016	us-gaap	Provision For Loan Losses Expensed ProvisionForLoanLossesExpensed	917000000	USD
CY2017Q1	us-gaap	Provision For Loan Losses Expensed ProvisionForLoanLossesExpensed	271000000	USD
CY2017Q2	us-gaap	Provision For Loan Losses Expensed ProvisionForLoanLossesExpensed	269000000	USD
CY2017Q3	us-gaap	Provision For Loan Losses Expensed ProvisionForLoanLossesExpensed	314000000	USD
CY2017Q4	us-gaap	Provision For Loan Losses Expensed ProvisionForLoanLossesExpensed	294000000	USD
CY2017	us-gaap	Provision For Loan Losses Expensed ProvisionForLoanLossesExpensed	1148000000	USD
CY2016Q4	us-gaap	Reinsurance Receivables Incurred But Not Reported Claims ReinsuranceReceivablesIncurredButNotReportedClaims	108000000	USD
CY2017Q4	us-gaap	Reinsurance Receivables Incurred But Not Reported Claims ReinsuranceReceivablesIncurredButNotReportedClaims	108000000	USD
CY2015Q4	us-gaap	Reinsurance Recoverables On Paid And Unpaid Losses ReinsuranceRecoverablesOnPaidAndUnpaidLosses	120000000	USD
CY2016Q4	us-gaap	Reinsurance Recoverables On Paid And Unpaid Losses ReinsuranceRecoverablesOnPaidAndUnpaidLosses	108000000	USD
CY2017Q4	us-gaap	Reinsurance Recoverables On Paid And Unpaid Losses ReinsuranceRecoverablesOnPaidAndUnpaidLosses	108000000	USD
CY2016Q4	us-gaap	Reinsurance Recoverables On Paid Losses Gross ReinsuranceRecoverablesOnPaidLossesGross	20000000	USD
CY2017Q4	us-gaap	Reinsurance Recoverables On Paid Losses Gross ReinsuranceRecoverablesOnPaidLossesGross	19000000	USD
CY2015	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	31350000000	USD
CY2016	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	26412000000	USD
CY2017	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	27908000000	USD
CY2016Q4	us-gaap	Restricted Cash RestrictedCash	1947000000	USD
CY2017Q4	us-gaap	Restricted Cash RestrictedCash	1017000000	USD
CY2016Q4	us-gaap	Restricted Cash And Cash Equivalents RestrictedCashAndCashEquivalents	111000000	USD
CY2017Q4	us-gaap	Restricted Cash And Cash Equivalents RestrictedCashAndCashEquivalents	94000000	USD
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CY2015	us-gaap	Revenues Revenues	4861000000	USD
CY2016	us-gaap	Revenues Revenues	5437000000	USD
CY2017	us-gaap	Revenues Revenues	5765000000	USD
CY2017Q2	us-gaap	Sales Revenue Net SalesRevenueNet	1455000000	USD
CY2016Q4	us-gaap	Sales Revenue Net SalesRevenueNet	1368000000	USD
CY2016	us-gaap	Sales Revenue Net SalesRevenueNet	5437000000	USD
CY2017Q1	us-gaap	Sales Revenue Net SalesRevenueNet	1375000000	USD
CY2017Q3	us-gaap	Sales Revenue Net SalesRevenueNet	1462000000	USD
CY2017Q4	us-gaap	Sales Revenue Net SalesRevenueNet	1473000000	USD
CY2017	us-gaap	Sales Revenue Net SalesRevenueNet	5765000000	USD
CY2016Q4	us-gaap	Secured Debt SecuredDebt	43129000000	USD
CY2017Q4	us-gaap	Secured Debt SecuredDebt	36837000000	USD
CY2016Q4	us-gaap	Securities Sold Under Agreements To Repurchase Gross SecuritiesSoldUnderAgreementsToRepurchaseGross	1176000000	USD
CY2017Q4	us-gaap	Securities Sold Under Agreements To Repurchase Gross SecuritiesSoldUnderAgreementsToRepurchaseGross	892000000	USD
CY2015	us-gaap	Securitization Financial Asset For Which Transfer Is Accounted As Sale Gain Loss On Sale SecuritizationFinancialAssetForWhichTransferIsAccountedAsSaleGainLossOnSale	-3000000	USD
CY2016	us-gaap	Securitization Financial Asset For Which Transfer Is Accounted As Sale Gain Loss On Sale SecuritizationFinancialAssetForWhichTransferIsAccountedAsSaleGainLossOnSale	0	USD
CY2017	us-gaap	Securitization Financial Asset For Which Transfer Is Accounted As Sale Gain Loss On Sale SecuritizationFinancialAssetForWhichTransferIsAccountedAsSaleGainLossOnSale	2000000	USD
CY2017Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Available For Grant ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant	37778224	shares
CY2016Q4	us-gaap	Short Term Borrowings ShortTermBorrowings	12673000000	USD
CY2017Q4	us-gaap	Short Term Borrowings ShortTermBorrowings	11413000000	USD
CY2016Q4	us-gaap	Short Term Debt Weighted Average Interest Rate ShortTermDebtWeightedAverageInterestRate	0.010
CY2017Q4	us-gaap	Short Term Debt Weighted Average Interest Rate ShortTermDebtWeightedAverageInterestRate	0.015
CY2017Q4	us-gaap	Shortduration Insurance Contracts Historical Claims Duration Year Five ShortdurationInsuranceContractsHistoricalClaimsDurationYearFive	0.002
CY2017Q4	us-gaap	Shortduration Insurance Contracts Historical Claims Duration Year Four ShortdurationInsuranceContractsHistoricalClaimsDurationYearFour	0.003
CY2017Q4	us-gaap	Shortduration Insurance Contracts Historical Claims Duration Year One ShortdurationInsuranceContractsHistoricalClaimsDurationYearOne	0.930
CY2017Q4	us-gaap	Shortduration Insurance Contracts Historical Claims Duration Year Six ShortdurationInsuranceContractsHistoricalClaimsDurationYearSix	0.004
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CY2017Q4	us-gaap	Shortduration Insurance Contracts Historical Claims Duration Year Two ShortdurationInsuranceContractsHistoricalClaimsDurationYearTwo	0.057
CY2017Q4	us-gaap	Shortduration Insurance Contracts Incurred Claims And Allocated Claim Adjustment Expense Net ShortdurationInsuranceContractsIncurredClaimsAndAllocatedClaimAdjustmentExpenseNet	2088000000	USD
CY2016Q4	us-gaap	Shortduration Insurance Contracts Liability For Unpaid Claims And Allocated Claim Adjustment Expense Net ShortdurationInsuranceContractsLiabilityForUnpaidClaimsAndAllocatedClaimAdjustmentExpenseNet	38000000	USD
CY2017Q4	us-gaap	Shortduration Insurance Contracts Liability For Unpaid Claims And Allocated Claim Adjustment Expense Net ShortdurationInsuranceContractsLiabilityForUnpaidClaimsAndAllocatedClaimAdjustmentExpenseNet	30000000	USD
CY2017Q4	us-gaap	Shortduration Insurance Contracts Liability For Unpaid Claims And Allocated Claim Adjustment Expense Net Not Separately Presented ShortdurationInsuranceContractsLiabilityForUnpaidClaimsAndAllocatedClaimAdjustmentExpenseNetNotSeparatelyPresented	7000000	USD
CY2016Q4	us-gaap	Shortduration Insurance Contracts Liability For Unpaid Claims And Claims Adjustment Expense Accumulated Unallocated Claim Adjustment Expense ShortdurationInsuranceContractsLiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseAccumulatedUnallocatedClaimAdjustmentExpense	3000000	USD
CY2017Q4	us-gaap	Shortduration Insurance Contracts Liability For Unpaid Claims And Claims Adjustment Expense Accumulated Unallocated Claim Adjustment Expense ShortdurationInsuranceContractsLiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseAccumulatedUnallocatedClaimAdjustmentExpense	2000000	USD
CY2017Q4	us-gaap	Significant Change In Unrecognized Tax Benefits Is Reasonably Possible Amount Of Unrecorded Benefit SignificantChangeInUnrecognizedTaxBenefitsIsReasonablyPossibleAmountOfUnrecordedBenefit	15000000	USD
CY2017Q4	us-gaap	Statutory Accounting Practices Statutory Amount Available For Dividend Payments StatutoryAccountingPracticesStatutoryAmountAvailableForDividendPayments	87000000	USD
CY2015	us-gaap	Stock Issued During Period Shares New Issues StockIssuedDuringPeriodSharesNewIssues	2654657	shares
CY2016	us-gaap	Stock Issued During Period Shares New Issues StockIssuedDuringPeriodSharesNewIssues	2916948	shares
CY2017	us-gaap	Stock Issued During Period Shares New Issues StockIssuedDuringPeriodSharesNewIssues	4175909	shares
CY2016Q3	us-gaap	Stock Repurchase Program Authorized Amount1 StockRepurchaseProgramAuthorizedAmount1	700000000	USD
CY2017Q2	us-gaap	Stock Repurchase Program Authorized Amount1 StockRepurchaseProgramAuthorizedAmount1	760000000	USD
CY2015	us-gaap	Stock Repurchased During Period Value StockRepurchasedDuringPeriodValue	325000000	USD
CY2016	us-gaap	Stock Repurchased During Period Value StockRepurchasedDuringPeriodValue	696000000	USD
CY2014Q4	us-gaap	Stockholders Equity StockholdersEquity	15399000000	USD
CY2015Q4	us-gaap	Stockholders Equity StockholdersEquity	13439000000	USD
CY2016Q4	us-gaap	Stockholders Equity StockholdersEquity	13317000000	USD
CY2017Q4	us-gaap	Stockholders Equity StockholdersEquity	13494000000	USD
CY2017Q4	us-gaap	Subordinated Debt SubordinatedDebt	1400000000	USD
CY2016	us-gaap	Supplemental Information For Property Casualty Insurance Underwriters Prior Year Claims And Claims Adjustment Expense SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense	-3000000	USD
CY2017	us-gaap	Supplemental Information For Property Casualty Insurance Underwriters Prior Year Claims And Claims Adjustment Expense SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense	0	USD
CY2016Q4	us-gaap	Supplemental Information For Property Casualty Insurance Underwriters Reserves For Unpaid Claims And Claims Adjustment Expense SupplementalInformationForPropertyCasualtyInsuranceUnderwritersReservesForUnpaidClaimsAndClaimsAdjustmentExpense	345000000	USD
CY2017Q4	us-gaap	Supplemental Information For Property Casualty Insurance Underwriters Reserves For Unpaid Claims And Claims Adjustment Expense SupplementalInformationForPropertyCasualtyInsuranceUnderwritersReservesForUnpaidClaimsAndClaimsAdjustmentExpense	332000000	USD
CY2017Q4	us-gaap	Tax Credit Carryforward Valuation Allowance TaxCreditCarryforwardValuationAllowance	983000000	USD
CY2015	us-gaap	Taxes Excluding Income And Excise Taxes TaxesExcludingIncomeAndExciseTaxes	29000000	USD
CY2016	us-gaap	Taxes Excluding Income And Excise Taxes TaxesExcludingIncomeAndExciseTaxes	25000000	USD
CY2017	us-gaap	Taxes Excluding Income And Excise Taxes TaxesExcludingIncomeAndExciseTaxes	21000000	USD
CY2017Q4	us-gaap	Tier One Risk Based Capital Required For Capital Adequacy To Risk Weighted Assets TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets	0.06
CY2016Q4	us-gaap	Time Deposits TimeDeposits	31795000000	USD
CY2017Q4	us-gaap	Time Deposits TimeDeposits	43869000000	USD
CY2016Q4	us-gaap	Time Deposits100000 Or More TimeDeposits100000OrMore	12100000000	USD
CY2017Q4	us-gaap	Time Deposits100000 Or More TimeDeposits100000OrMore	18900000000	USD
CY2016Q4	us-gaap	Time Deposits At Or Above Fdic Insurance Limit TimeDepositsAtOrAboveFDICInsuranceLimit	3500000000	USD
CY2017Q4	us-gaap	Time Deposits At Or Above Fdic Insurance Limit TimeDepositsAtOrAboveFDICInsuranceLimit	5300000000	USD
CY2016Q4	us-gaap	Trading Securities TradingSecurities	0	USD
CY2015	us-gaap	Transfer Of Portfolio Loans And Leases To Held For Sale1 TransferOfPortfolioLoansAndLeasesToHeldForSale1	1311000000	USD
CY2016	us-gaap	Transfer Of Portfolio Loans And Leases To Held For Sale1 TransferOfPortfolioLoansAndLeasesToHeldForSale1	4282000000	USD
CY2017	us-gaap	Transfer Of Portfolio Loans And Leases To Held For Sale1 TransferOfPortfolioLoansAndLeasesToHeldForSale1	1339000000	USD
CY2014Q4	us-gaap	Treasury Stock Shares TreasuryStockShares	41148	shares
CY2015Q4	us-gaap	Treasury Stock Shares TreasuryStockShares	810585	shares
CY2016Q4	us-gaap	Treasury Stock Shares TreasuryStockShares	18707338	shares
CY2017Q4	us-gaap	Treasury Stock Shares TreasuryStockShares	52829617	shares
CY2015	us-gaap	Treasury Stock Shares Acquired TreasuryStockSharesAcquired	769437	shares
CY2016	us-gaap	Treasury Stock Shares Acquired TreasuryStockSharesAcquired	17896753	shares
CY2017	us-gaap	Treasury Stock Shares Acquired TreasuryStockSharesAcquired	34122279	shares
CY2016Q4	us-gaap	Treasury Stock Value TreasuryStockValue	357000000	USD
CY2017Q4	us-gaap	Treasury Stock Value TreasuryStockValue	1110000000	USD
CY2015	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	16000000	USD
CY2016	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	341000000	USD
CY2017	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	753000000	USD
CY2016Q4	us-gaap	Unearned Premiums UnearnedPremiums	2500000000	USD
CY2017Q4	us-gaap	Unearned Premiums UnearnedPremiums	2604000000	USD
CY2014Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	191000000	USD
CY2015Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	185000000	USD
CY2016Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	14000000	USD
CY2017Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	15000000	USD
CY2015	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	0	USD
CY2016	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	0	USD
CY2017	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	1000000	USD
CY2015	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	10000000	USD
CY2016	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	182000000	USD
CY2017	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	0	USD
CY2016Q4	us-gaap	Unrecognized Tax Benefits Income Tax Penalties And Interest Accrued UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued	1000000	USD
CY2017Q4	us-gaap	Unrecognized Tax Benefits Income Tax Penalties And Interest Accrued UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued	1000000	USD
CY2015	us-gaap	Unrecognized Tax Benefits Income Tax Penalties And Interest Expense UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense	1000000	USD
CY2015Q4	us-gaap	Unrecognized Tax Benefits Income Tax Penalties And Interest Accrued UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued	2000000	USD
CY2015	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	0	USD
CY2016	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	0	USD
CY2017	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	0	USD
CY2015	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	7000000	USD
CY2016	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	12000000	USD
CY2017	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	3000000	USD
CY2015	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	3000000	USD
CY2016	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	1000000	USD
CY2017	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	1000000	USD
CY2015Q4	us-gaap	Unrecognized Tax Benefits That Would Impact Effective Tax Rate UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate	177000000	USD
CY2016Q4	us-gaap	Unrecognized Tax Benefits That Would Impact Effective Tax Rate UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate	9000000	USD
CY2017Q4	us-gaap	Unrecognized Tax Benefits That Would Impact Effective Tax Rate UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate	12000000	USD
CY2016Q4	us-gaap	Variable Interest Entity Entity Maximum Loss Exposure Amount VariableInterestEntityEntityMaximumLossExposureAmount	3574000000	USD
CY2017Q4	us-gaap	Variable Interest Entity Entity Maximum Loss Exposure Amount VariableInterestEntityEntityMaximumLossExposureAmount	2791000000	USD
CY2015	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	482873000	shares
CY2016	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	482182000	shares
CY2017	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	455350000	shares
CY2015	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	482873000	shares
CY2016	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	481105000	shares
CY2017	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	453704000	shares
CY2017	us-gaap	Loss Contingency Disclosures LossContingencyDisclosures	<div style="font-family:Times New Roman;font-size:10pt;"><div style="line-height:120%;padding-top:10px;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;font-weight:bold;">Contingencies and Other Risks</font></div><div style="line-height:120%;padding-top:2px;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;font-weight:bold;">Concentration with GM and Chrysler</font></div><div style="line-height:120%;padding-top:2px;text-align:left;text-indent:24px;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;">While we are continuing to diversify our automotive finance and insurance businesses and to expand into other financial services, General Motors Company (GM) and Fiat Chrysler Automobiles US LLC (Chrysler) dealers and their retail customers continue to constitute a significant portion of our customer base. GM, Chrysler, and their captive finance companies compete forcefully with us and could take further actions that negatively impact the amount of business that we do with GM and Chrysler dealers and their customers. Further, a significant adverse change in GM’s or Chrysler’s business—including, for example, in the production or sale of GM or Chrysler vehicles, the quality or resale value of GM or Chrysler vehicles, GM’s or Chrysler’s relationships with its key suppliers, or the rate or volume of recalls of GM or Chrysler vehicles—could negatively impact our GM and Chrysler dealer and retail customer bases. Any future reductions in GM and Chrysler business that we are not able to offset could adversely affect our business and financial results.</font></div><div style="line-height:120%;padding-top:10px;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;font-weight:bold;">Legal Matters</font></div><div style="line-height:120%;padding-top:2px;text-align:left;text-indent:24px;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;">Ally and its subsidiaries, including Ally Bank, </font><font style="font-family:inherit;font-size:9pt;">are or may be subject to potential liability in connection with pending or threatened legal proceedings and other matters. These legal matters may be formal or informal and include litigation and arbitration with one or more identified claimants, certified or purported class actions with yet-to-be-identified claimants, and regulatory or other governmental information-gathering requests, examinations, investigations, and enforcement proceedings. Our legal matters exist in varying stages of adjudication, arbitration, negotiation, or investigation and span our lines of business and operations. Claims may be based in law or equity—such as those arising under contracts or in tort and those involving banking, consumer-protection, securities, tax, employment, and other laws—and some can present novel legal theories and allege substantial or indeterminate damages.</font></div><div style="line-height:120%;padding-top:10px;text-align:left;text-indent:24px;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;">We accrue for a legal matter when a loss becomes probable and the amount of loss can be reasonably estimated. Accruals are evaluated each quarter and may be adjusted, upward or downward, based on our best judgment after consultation with counsel. No assurance exists that our accruals will not need to be adjusted in the future. When a probable or reasonably possible loss on a legal matter could be material to our consolidated financial condition, results of operations, or cash flows, we provide disclosure in this note as prescribed by ASC 450, </font><font style="font-family:inherit;font-size:9pt;font-style:italic;">Contingencies</font><font style="font-family:inherit;font-size:9pt;">.</font></div><div style="line-height:120%;padding-top:10px;text-align:left;text-indent:24px;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;">The course and outcome of legal matters are inherently unpredictable. This is especially so when a matter is still in its early stages, the damages sought are indeterminate or unsupported, significant facts are unclear or disputed, novel questions of law or other meaningful legal uncertainties exist, a request to certify a proceeding as a class action is outstanding or granted, multiple parties are named, or regulatory or other governmental entities are involved. As a result, we often are unable to determine how or when threatened or pending legal matters will be resolved and what losses may be incurred. Actual losses may be higher or lower than any amounts accrued or estimated for those matters, possibly to a significant degree.</font></div><div style="line-height:120%;padding-top:10px;text-align:left;text-indent:24px;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;">Descriptions of our material legal matters follow. We do not believe, however, that an estimate of reasonably possible losses or a range of reasonably possible losses—whether in excess of any related accrual or where no accrual exists—can be made for any of these matters for some or all of the reasons identified in the preceding paragraph.</font></div><div style="line-height:120%;padding-top:10px;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-weight:bold;">Securities Litigation</font></div><div style="line-height:120%;padding-top:2px;text-align:left;text-indent:24px;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;">In October 2016, a purported class action—Bucks County Employees Retirement Fund v. Ally Financial Inc. et al.—was filed in the Circuit Court for Wayne County in the State of Michigan (Case No. 16-013616-CZ). This matter was removed to the U.S. District Court for the Eastern District of Michigan on November 18, 2016. The complaint alleges material misstatements and omissions in connection with Ally’s initial public offering in April 2014, including a failure to adequately disclose the severity of rising subprime automotive loan delinquency rates, deficient underwriting measures employed in the origination of subprime automotive loans, and aggressive tactics used with low-income borrowers. The request for relief includes an indeterminate amount of damages, fees, and costs and other remedies. In January 2017, another purported class action—National Shopmen Pension Fund v. Ally Financial Inc. et al.—was filed in the Circuit Court for Oakland County in the State of Michigan (Case No. 2017-156719-CB). This matter was removed to the U.S. District Court for the Eastern District of Michigan on January 30, 2017. In March 2017, a third purported class action—James McIntire v. Ally Financial Inc. et al.—was filed in the Circuit Court for Wayne County in the State of Michigan (Case No. 17-003811-CZ). This matter was removed to the U.S. District Court for the Eastern District of Michigan on March 15, 2017. The allegations and requested relief in the National Shopmen Pension Fund and James McIntire complaints are substantially similar to those included in the complaint filed by Bucks County Employees Retirement Fund. All three matters were remanded from the U.S. District Court for the Eastern District of Michigan to the state circuit courts on May 26, 2017, and have been consolidated for discovery in Wayne County Circuit Court as In re Ally Financial, Inc. Securities Litigation (Case No. 16-013616-CB). In November 2017, the plaintiffs filed a consolidated amended complaint, and the court entered an interim stay of the litigation. We intend to vigorously defend against each of these actions.</font></div><div style="line-height:120%;padding-top:10px;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-weight:bold;">Automotive Subprime Matters</font></div><div style="line-height:120%;padding-top:2px;text-align:left;text-indent:24px;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;">In October 2014, we received a document request from the SEC in connection with its investigation related to subprime automotive finance and related securitization activities. Separately, in December 2014, we received a subpoena from the U.S. Department of Justice requesting similar information. In May 2015 and December 2016, we received information requests from the New York Department of Financial Services requesting similar information. We responded timely to each of the requests.</font></div><div style="line-height:120%;padding-top:10px;text-align:left;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;font-weight:bold;">Other Contingencies</font></div><div style="line-height:120%;padding-top:2px;text-align:left;text-indent:24px;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;">Ally and its subsidiaries, including Ally Bank, </font><font style="font-family:inherit;font-size:9pt;">are or may be subject to potential liability under various other contingent exposures, including indemnification, tax, self-insurance, and other miscellaneous contingencies. We accrue for a contingent exposure when a loss becomes probable and the amount of loss can be reasonably estimated. Accruals are evaluated each quarter and may be adjusted, upward or downward, based on our best judgment. No assurance exists that our accruals will not need to be adjusted in the future, and actual losses may be higher or lower than any amounts accrued or estimated for those exposures, possibly to a significant degree. On the basis of information currently available, we do not believe that these other contingent exposures will be material to our consolidated financial condition, results of operations, or cash flows.</font><font style="font-family:inherit;font-size:9pt;"> Refer to Note 1 for additional information related to our policy for establishing reserves for legal and regulatory matters.</font></div></div>
CY2017	us-gaap	Premiums Receivable Note PremiumsReceivableNote	<div style="font-family:Times New Roman;font-size:10pt;"><div style="line-height:120%;padding-top:10px;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;font-weight:bold;">Premiums Receivable and Other Insurance Assets</font></div><div style="line-height:120%;padding-top:2px;text-indent:24px;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;">Premiums receivable and other insurance assets consisted of the following.</font></div><div style="line-height:120%;font-size:10pt;"><div style="padding-left:0px;text-indent:0px;line-height:normal;padding-top:10px;"><table cellpadding="0" cellspacing="0" style="font-family:Times New Roman;font-size:10pt;width:100%;border-collapse:collapse;text-align:left;"><tr><td colspan="9" rowspan="1"></td></tr><tr><td style="width:78%;" rowspan="1" colspan="1"></td><td style="width:1%;" rowspan="1" colspan="1"></td><td style="width:1%;" rowspan="1" colspan="1"></td><td style="width:8%;" rowspan="1" colspan="1"></td><td style="width:1%;" rowspan="1" colspan="1"></td><td style="width:1%;" rowspan="1" colspan="1"></td><td style="width:1%;" rowspan="1" colspan="1"></td><td style="width:8%;" rowspan="1" colspan="1"></td><td style="width:1%;" rowspan="1" colspan="1"></td></tr><tr><td style="vertical-align:bottom;border-bottom:1px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="font-size:9pt;"><font style="font-family:inherit;font-size:9pt;">December 31, </font><font style="font-family:inherit;font-size:9pt;font-style:italic;">($ in millions)</font></div></td><td style="vertical-align:bottom;border-bottom:1px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td colspan="3" style="vertical-align:bottom;border-bottom:1px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1"><div style="text-align:center;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;font-weight:bold;">2017</font></div></td><td style="vertical-align:bottom;border-bottom:1px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td colspan="3" style="vertical-align:bottom;border-bottom:1px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1"><div style="text-align:center;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;">2016</font></div></td></tr><tr><td style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-top:1px solid #000000;" rowspan="1" colspan="1"><div style="text-align:left;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;">Prepaid reinsurance premiums</font></div></td><td style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;background-color:#cceeff;" rowspan="1" colspan="1"><div style="text-align:left;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;font-weight:bold;">$</font></div></td><td style="vertical-align:bottom;background-color:#cceeff;padding-top:2px;padding-bottom:2px;" rowspan="1" colspan="1"><div style="text-align:right;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;font-weight:bold;">507</font></div></td><td style="vertical-align:bottom;background-color:#cceeff;" rowspan="1" colspan="1"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br clear="none"/></font></div></td><td style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;background-color:#cceeff;" rowspan="1" colspan="1"><div style="text-align:left;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;">$</font></div></td><td style="vertical-align:bottom;background-color:#cceeff;padding-top:2px;padding-bottom:2px;" rowspan="1" colspan="1"><div style="text-align:right;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;">439</font></div></td><td style="vertical-align:bottom;background-color:#cceeff;" rowspan="1" colspan="1"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br clear="none"/></font></div></td></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="text-align:left;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;">Reinsurance recoverable on unpaid losses</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td colspan="2" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;" rowspan="1"><div style="text-align:right;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;font-weight:bold;">108</font></div></td><td style="vertical-align:bottom;" rowspan="1" colspan="1"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br clear="none"/></font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td colspan="2" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;" rowspan="1"><div style="text-align:right;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;">108</font></div></td><td style="vertical-align:bottom;" rowspan="1" colspan="1"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br clear="none"/></font></div></td></tr><tr><td style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="text-align:left;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;">Reinsurance recoverable on paid losses</font></div></td><td style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td colspan="2" style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;" rowspan="1"><div style="text-align:right;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;font-weight:bold;">19</font></div></td><td style="vertical-align:bottom;background-color:#cceeff;" rowspan="1" colspan="1"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br clear="none"/></font></div></td><td style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td colspan="2" style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;" rowspan="1"><div style="text-align:right;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;">20</font></div></td><td style="vertical-align:bottom;background-color:#cceeff;" rowspan="1" colspan="1"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br clear="none"/></font></div></td></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="text-align:left;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;">Premiums receivable</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td colspan="2" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;" rowspan="1"><div style="text-align:right;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;font-weight:bold;">84</font></div></td><td style="vertical-align:bottom;" rowspan="1" colspan="1"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br clear="none"/></font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td colspan="2" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;" rowspan="1"><div style="text-align:right;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;">80</font></div></td><td style="vertical-align:bottom;" rowspan="1" colspan="1"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br clear="none"/></font></div></td></tr><tr><td style="vertical-align:bottom;border-bottom:1px solid #000000;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="text-align:left;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;">Deferred policy acquisition costs</font></div></td><td style="vertical-align:bottom;border-bottom:1px solid #000000;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td colspan="2" style="vertical-align:bottom;border-bottom:1px solid #000000;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;" rowspan="1"><div style="text-align:right;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;font-weight:bold;">1,329</font></div></td><td style="vertical-align:bottom;border-bottom:1px solid #000000;background-color:#cceeff;" rowspan="1" colspan="1"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br clear="none"/></font></div></td><td style="vertical-align:bottom;border-bottom:1px solid #000000;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td colspan="2" style="vertical-align:bottom;border-bottom:1px solid #000000;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;" rowspan="1"><div style="text-align:right;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;">1,258</font></div></td><td style="vertical-align:bottom;border-bottom:1px solid #000000;background-color:#cceeff;" rowspan="1" colspan="1"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br clear="none"/></font></div></td></tr><tr><td style="vertical-align:bottom;border-bottom:2px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="text-align:left;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;">Total premiums receivable and other insurance assets</font></div></td><td style="vertical-align:bottom;border-bottom:2px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td style="vertical-align:bottom;border-bottom:2px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;" rowspan="1" colspan="1"><div style="text-align:left;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;font-weight:bold;">$</font></div></td><td style="vertical-align:bottom;border-bottom:2px solid #000000;padding-top:2px;padding-bottom:2px;" rowspan="1" colspan="1"><div style="text-align:right;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;font-weight:bold;">2,047</font></div></td><td style="vertical-align:bottom;border-bottom:2px solid #000000;" rowspan="1" colspan="1"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br clear="none"/></font></div></td><td style="vertical-align:bottom;border-bottom:2px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="text-align:right;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;"><br clear="none"/></font></div></td><td style="vertical-align:bottom;border-bottom:2px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;" rowspan="1" colspan="1"><div style="text-align:left;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;">$</font></div></td><td style="vertical-align:bottom;border-bottom:2px solid #000000;padding-top:2px;padding-bottom:2px;" rowspan="1" colspan="1"><div style="text-align:right;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;">1,905</font></div></td><td style="vertical-align:bottom;border-bottom:2px solid #000000;" rowspan="1" colspan="1"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br clear="none"/></font></div></td></tr></table></div></div></div>
CY2017	us-gaap	Revenue Recognition Deferred Revenue RevenueRecognitionDeferredRevenue	<div style="font-family:Times New Roman;font-size:10pt;"><div style="line-height:120%;padding-top:2px;text-indent:24px;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;">Insurance premiums, net of premiums ceded to reinsurers, and service revenue are earned over the terms of the policies. The portion of premiums and service revenue written applicable to the unexpired terms of the policies is recorded as unearned insurance premiums or unearned service revenue. For vehicle service and maintenance contracts, premiums and service revenues are earned on a basis proportionate to the anticipated cost emergence. For other short duration contracts, premiums and service revenue are earned on a pro rata basis. For further information, refer to </font><font style="font-family:inherit;font-size:9pt;">Note 4</font><font style="font-family:inherit;font-size:9pt;">.</font></div></div>
CY2017	us-gaap	Revenue Recognition Leases Operating RevenueRecognitionLeasesOperating	<div style="font-family:Times New Roman;font-size:10pt;"><div style="line-height:120%;padding-top:2px;text-align:left;text-indent:24px;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;">Investment in operating leases, net, represents the automobiles that are underlying our automotive lease contracts and is reported at cost, less accumulated depreciation and net of impairment charges and origination fees or costs. Depreciation of vehicles is recorded on a straight-line basis to an estimated residual value over the lease term. Manufacturer support payments that we receive upfront are treated as a reduction to the cost-basis in the underlying lease asset, which has the effect of reducing depreciation expense over the life of the contract. We periodically evaluate our depreciation rate for leased vehicles based on expected residual values and adjust depreciation expense over the remaining life of the lease if deemed necessary. Income from operating lease assets that includes lease origination fees, net of lease origination costs, is recognized as operating lease revenue on a straight-line basis over the scheduled lease term.</font></div><div style="line-height:120%;padding-top:10px;text-indent:24px;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;">We have significant investments in the residual values of the assets in our operating lease portfolio. The residual values represent an estimate of the values of the assets at the end of the lease contracts. At contract inception, we determine pricing based on the projected residual value of the lease vehicle. This evaluation is primarily based on a proprietary model, which includes variables such as age, expected mileage, seasonality, segment factors, vehicle type, economic indicators, production cycle, automotive manufacturer incentives, and shifts in used vehicle supply. This internally-generated data is compared against third-party, independent data for reasonableness. Realization of the residual values is dependent on our future ability to market the vehicles under the prevailing market conditions. Over the life of the lease, we evaluate the adequacy of our estimate of the residual value and make adjustments to the depreciation rates to the extent the expected value of the vehicle at lease termination changes. In addition to estimating the residual value at lease termination, we also evaluate the current value of the operating lease asset and test for impairment to the extent necessary when there is an indication of impairment based on market considerations and portfolio characteristics. Impairment is determined to exist if fair value of the leased asset is less than carrying value and it is determined that the net carrying value is not recoverable. The net carrying value of a leased asset is not recoverable if it exceeds the sum of the undiscounted expected future cash flows expected to result from the lease payments and the estimated residual value upon eventual disposition. If our operating lease assets are considered to be impaired, the impairment is measured as the amount by which the carrying amount of the assets exceeds the fair value as estimated by discounted cash flows. No impairment was recognized in </font><font style="font-family:inherit;font-size:9pt;">2017</font><font style="font-family:inherit;font-size:9pt;">, </font><font style="font-family:inherit;font-size:9pt;">2016</font><font style="font-family:inherit;font-size:9pt;">, or </font><font style="font-family:inherit;font-size:9pt;">2015</font><font style="font-family:inherit;font-size:9pt;">. We accrue rental income on our operating leases when collection is reasonably assured. We generally discontinue the accrual of revenue on operating leases at the time an account is determined to be uncollectible, at the earliest of the time of repossession, within 60 days of bankruptcy notification and greater than 60 days past due, or greater than 120 days past due.</font></div><div style="line-height:120%;padding-top:10px;text-indent:24px;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;">When a lease vehicle is returned to us, either at the end of the lease term or through repossession, the asset is reclassified from investment in operating leases, net, to other assets and recorded at the lower-of-cost or estimated fair value, less costs to sell, on our Consolidated Balance Sheet. Any losses recognized at this time are recorded as depreciation expense. Subsequent decline in value and any gain or loss recognized at the time of sale is recognized as a remarketing gain or loss and presented as a component of depreciation expense.</font></div></div>
CY2017	us-gaap	Schedule Of Liability For Unpaid Claims And Claims Adjustment Expense ScheduleOfLiabilityForUnpaidClaimsAndClaimsAdjustmentExpense	<div style="font-family:Times New Roman;font-size:10pt;"><div style="line-height:120%;padding-top:10px;text-align:left;text-indent:24px;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;">The following table shows a rollforward of our reserves for insurance losses and loss adjustment expenses.</font></div><div style="line-height:120%;text-align:left;font-size:10pt;"><div style="padding-left:0px;text-indent:0px;line-height:normal;padding-top:10px;"><table cellpadding="0" cellspacing="0" style="font-family:Times New Roman;font-size:10pt;width:100%;border-collapse:collapse;text-align:left;"><tr><td colspan="9" rowspan="1"></td></tr><tr><td style="width:78%;" rowspan="1" colspan="1"></td><td style="width:1%;" rowspan="1" colspan="1"></td><td style="width:1%;" rowspan="1" colspan="1"></td><td style="width:8%;" rowspan="1" colspan="1"></td><td style="width:1%;" rowspan="1" colspan="1"></td><td style="width:1%;" rowspan="1" colspan="1"></td><td style="width:1%;" rowspan="1" colspan="1"></td><td style="width:8%;" rowspan="1" colspan="1"></td><td style="width:1%;" rowspan="1" colspan="1"></td></tr><tr><td style="vertical-align:bottom;border-bottom:1px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="text-align:left;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;font-style:italic;">($ in millions)</font></div></td><td style="vertical-align:bottom;border-bottom:1px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td colspan="3" style="vertical-align:bottom;border-bottom:1px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1"><div style="text-align:center;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;font-weight:bold;">2017</font></div></td><td style="vertical-align:bottom;border-bottom:1px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td colspan="3" style="vertical-align:bottom;border-bottom:1px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1"><div style="text-align:center;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;">2016</font></div></td></tr><tr><td style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="font-size:9pt;"><font style="font-family:inherit;font-size:9pt;">Total gross reserves for insurance losses and loss adjustment expenses at January 1,</font></div></td><td style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;background-color:#cceeff;border-top:1px solid #000000;" rowspan="1" colspan="1"><div style="text-align:left;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;font-weight:bold;">$</font></div></td><td style="vertical-align:bottom;background-color:#cceeff;padding-top:2px;padding-bottom:2px;border-top:1px solid #000000;" rowspan="1" colspan="1"><div style="text-align:right;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;font-weight:bold;">149</font></div></td><td style="vertical-align:bottom;background-color:#cceeff;border-top:1px solid #000000;" rowspan="1" colspan="1"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br clear="none"/></font></div></td><td style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-top:1px solid #000000;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;background-color:#cceeff;border-top:1px solid #000000;" rowspan="1" colspan="1"><div style="text-align:left;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;">$</font></div></td><td style="vertical-align:bottom;background-color:#cceeff;padding-top:2px;padding-bottom:2px;border-top:1px solid #000000;" rowspan="1" colspan="1"><div style="text-align:right;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;">169</font></div></td><td style="vertical-align:bottom;background-color:#cceeff;border-top:1px solid #000000;" rowspan="1" colspan="1"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br clear="none"/></font></div></td></tr><tr><td style="vertical-align:bottom;border-bottom:1px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="font-size:9pt;"><font style="font-family:inherit;font-size:9pt;">Less: Reinsurance recoverable</font></div></td><td style="vertical-align:bottom;border-bottom:1px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td colspan="2" style="vertical-align:bottom;border-bottom:1px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;" rowspan="1"><div style="text-align:right;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;font-weight:bold;">108</font></div></td><td style="vertical-align:bottom;border-bottom:1px solid #000000;" rowspan="1" colspan="1"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br clear="none"/></font></div></td><td style="vertical-align:bottom;border-bottom:1px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td colspan="2" style="vertical-align:bottom;border-bottom:1px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;" rowspan="1"><div style="text-align:right;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;">120</font></div></td><td style="vertical-align:bottom;border-bottom:1px solid #000000;" rowspan="1" colspan="1"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br clear="none"/></font></div></td></tr><tr><td style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="font-size:9pt;"><font style="font-family:inherit;font-size:9pt;">Net reserves for insurance losses and loss adjustment expenses at January 1,</font></div></td><td style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td colspan="2" style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;" rowspan="1"><div style="text-align:right;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;font-weight:bold;">41</font></div></td><td style="vertical-align:bottom;background-color:#cceeff;" rowspan="1" colspan="1"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br clear="none"/></font></div></td><td style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td colspan="2" style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;border-top:1px solid #000000;" rowspan="1"><div style="text-align:right;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;">49</font></div></td><td style="vertical-align:bottom;background-color:#cceeff;border-top:1px solid #000000;" rowspan="1" colspan="1"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br clear="none"/></font></div></td></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="font-size:9pt;"><font style="font-family:inherit;font-size:9pt;">Net insurance losses and loss adjustment expenses incurred related to:</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td colspan="3" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td colspan="3" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td></tr><tr><td style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="text-indent:12px;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;">Current year</font></div></td><td style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td colspan="2" style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;" rowspan="1"><div style="text-align:right;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;font-weight:bold;">332</font></div></td><td style="vertical-align:bottom;background-color:#cceeff;" rowspan="1" colspan="1"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br clear="none"/></font></div></td><td style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td colspan="2" style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;" rowspan="1"><div style="text-align:right;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;">345</font></div></td><td style="vertical-align:bottom;background-color:#cceeff;" rowspan="1" colspan="1"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br clear="none"/></font></div></td></tr><tr><td style="vertical-align:bottom;border-bottom:1px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="text-indent:12px;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;">Prior years (a)</font></div></td><td style="vertical-align:bottom;border-bottom:1px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td colspan="2" style="vertical-align:bottom;border-bottom:1px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;" rowspan="1"><div style="text-align:right;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;font-weight:bold;">—</font></div></td><td style="vertical-align:bottom;border-bottom:1px solid #000000;" rowspan="1" colspan="1"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br clear="none"/></font></div></td><td style="vertical-align:bottom;border-bottom:1px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td colspan="2" style="vertical-align:bottom;border-bottom:1px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;" rowspan="1"><div style="text-align:right;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;">(3</font></div></td><td style="vertical-align:bottom;border-bottom:1px solid #000000;padding-right:2px;padding-top:2px;padding-bottom:2px;" rowspan="1" colspan="1"><div style="text-align:left;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;">)</font></div></td></tr><tr><td style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="font-size:9pt;"><font style="font-family:inherit;font-size:9pt;">Total net insurance losses and loss adjustment expenses incurred</font></div></td><td style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td colspan="2" style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;" rowspan="1"><div style="text-align:right;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;font-weight:bold;">332</font></div></td><td style="vertical-align:bottom;background-color:#cceeff;" rowspan="1" colspan="1"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br clear="none"/></font></div></td><td style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td colspan="2" style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;border-top:1px solid #000000;" rowspan="1"><div style="text-align:right;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;">342</font></div></td><td style="vertical-align:bottom;background-color:#cceeff;border-top:1px solid #000000;" rowspan="1" colspan="1"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br clear="none"/></font></div></td></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="font-size:9pt;"><font style="font-family:inherit;font-size:9pt;">Net insurance losses and loss adjustment expenses paid or payable related to:</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td colspan="3" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td colspan="3" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td></tr><tr><td style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="text-indent:12px;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;">Current year</font></div></td><td style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td colspan="2" style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;" rowspan="1"><div style="text-align:right;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;font-weight:bold;">(309</font></div></td><td style="vertical-align:bottom;background-color:#cceeff;padding-right:2px;padding-top:2px;padding-bottom:2px;" rowspan="1" colspan="1"><div style="text-align:left;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;font-weight:bold;">)</font></div></td><td style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td colspan="2" style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;" rowspan="1"><div style="text-align:right;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;">(320</font></div></td><td style="vertical-align:bottom;background-color:#cceeff;padding-right:2px;padding-top:2px;padding-bottom:2px;" rowspan="1" colspan="1"><div style="text-align:left;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;">)</font></div></td></tr><tr><td style="vertical-align:bottom;border-bottom:1px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="text-indent:12px;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;">Prior years</font></div></td><td style="vertical-align:bottom;border-bottom:1px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td colspan="2" style="vertical-align:bottom;border-bottom:1px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;" rowspan="1"><div style="text-align:right;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;font-weight:bold;">(32</font></div></td><td style="vertical-align:bottom;border-bottom:1px solid #000000;padding-right:2px;padding-top:2px;padding-bottom:2px;" rowspan="1" colspan="1"><div style="text-align:left;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;font-weight:bold;">)</font></div></td><td style="vertical-align:bottom;border-bottom:1px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td colspan="2" style="vertical-align:bottom;border-bottom:1px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;" rowspan="1"><div style="text-align:right;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;">(30</font></div></td><td style="vertical-align:bottom;border-bottom:1px solid #000000;padding-right:2px;padding-top:2px;padding-bottom:2px;" rowspan="1" colspan="1"><div style="text-align:left;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;">)</font></div></td></tr><tr><td style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="font-size:9pt;"><font style="font-family:inherit;font-size:9pt;">Total net insurance losses and loss adjustment expenses paid or payable</font></div></td><td style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td colspan="2" style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;" rowspan="1"><div style="text-align:right;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;font-weight:bold;">(341</font></div></td><td style="vertical-align:bottom;background-color:#cceeff;padding-right:2px;padding-top:2px;padding-bottom:2px;" rowspan="1" colspan="1"><div style="text-align:left;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;font-weight:bold;">)</font></div></td><td style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td colspan="2" style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;border-top:1px solid #000000;" rowspan="1"><div style="text-align:right;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;">(350</font></div></td><td style="vertical-align:bottom;background-color:#cceeff;padding-right:2px;padding-top:2px;padding-bottom:2px;border-top:1px solid #000000;" rowspan="1" colspan="1"><div style="text-align:left;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;">)</font></div></td></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-top:1px solid #000000;" rowspan="1" colspan="1"><div style="font-size:9pt;"><font style="font-family:inherit;font-size:9pt;">Net reserves for insurance losses and loss adjustment expenses at December 31,</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-top:1px solid #000000;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td colspan="2" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;border-top:1px solid #000000;" rowspan="1"><div style="text-align:right;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;font-weight:bold;">32</font></div></td><td style="vertical-align:bottom;border-top:1px solid #000000;" rowspan="1" colspan="1"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br clear="none"/></font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-top:1px solid #000000;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td colspan="2" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;border-top:1px solid #000000;" rowspan="1"><div style="text-align:right;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;">41</font></div></td><td style="vertical-align:bottom;border-top:1px solid #000000;" rowspan="1" colspan="1"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br clear="none"/></font></div></td></tr><tr><td style="vertical-align:bottom;border-bottom:1px solid #000000;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="font-size:9pt;"><font style="font-family:inherit;font-size:9pt;">Plus: Reinsurance recoverable</font></div></td><td style="vertical-align:bottom;border-bottom:1px solid #000000;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td colspan="2" style="vertical-align:bottom;border-bottom:1px solid #000000;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;" rowspan="1"><div style="text-align:right;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;font-weight:bold;">108</font></div></td><td style="vertical-align:bottom;border-bottom:1px solid #000000;background-color:#cceeff;" rowspan="1" colspan="1"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br clear="none"/></font></div></td><td style="vertical-align:bottom;border-bottom:1px solid #000000;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td colspan="2" style="vertical-align:bottom;border-bottom:1px solid #000000;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;" rowspan="1"><div style="text-align:right;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;">108</font></div></td><td style="vertical-align:bottom;border-bottom:1px solid #000000;background-color:#cceeff;" rowspan="1" colspan="1"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br clear="none"/></font></div></td></tr><tr><td style="vertical-align:bottom;border-bottom:2px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="font-size:9pt;"><font style="font-family:inherit;font-size:9pt;">Total gross reserves for insurance losses and loss adjustment expenses at December 31,</font></div></td><td style="vertical-align:bottom;border-bottom:2px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td style="vertical-align:bottom;border-bottom:2px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;" rowspan="1" colspan="1"><div style="text-align:left;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;font-weight:bold;">$</font></div></td><td style="vertical-align:bottom;border-bottom:2px solid #000000;padding-top:2px;padding-bottom:2px;" rowspan="1" colspan="1"><div style="text-align:right;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;font-weight:bold;">140</font></div></td><td style="vertical-align:bottom;border-bottom:2px solid #000000;" rowspan="1" colspan="1"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br clear="none"/></font></div></td><td style="vertical-align:bottom;border-bottom:2px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td style="vertical-align:bottom;border-bottom:2px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;border-top:1px solid #000000;" rowspan="1" colspan="1"><div style="text-align:left;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;">$</font></div></td><td style="vertical-align:bottom;border-bottom:2px solid #000000;padding-top:2px;padding-bottom:2px;border-top:1px solid #000000;" rowspan="1" colspan="1"><div style="text-align:right;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;">149</font></div></td><td style="vertical-align:bottom;border-bottom:2px solid #000000;border-top:1px solid #000000;" rowspan="1" colspan="1"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br clear="none"/></font></div></td></tr></table></div></div><table cellpadding="0" cellspacing="0" style="font-family:Times New Roman; font-size:10pt;"><tr><td style="width:24px;" rowspan="1" colspan="1"></td><td rowspan="1" colspan="1"></td></tr><tr><td style="vertical-align:top" rowspan="1" colspan="1"><div style="line-height:120%;font-size:8pt;padding-left:0px;"><font style="font-family:inherit;font-size:8pt;">(a)</font></div></td><td style="vertical-align:top;" rowspan="1" colspan="1"><div style="line-height:120%;text-align:left;font-size:8pt;"><font style="font-family:inherit;font-size:8pt;">There have been no material adverse changes to the reserve for prior years.</font></div></td></tr></table></div>
CY2017	us-gaap	Use Of Estimates UseOfEstimates	<div style="font-family:Times New Roman;font-size:10pt;"><div style="line-height:120%;padding-top:2px;text-indent:24px;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;">The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and that affect income and expenses during the reporting period and related disclosures. In developing the estimates and assumptions, management uses all available evidence; however, actual results could differ because of uncertainties associated with estimating the amounts, timing, and likelihood of possible outcomes. Our most significant estimates pertain to the allowance for loan losses, valuations of automotive lease assets and residuals, fair value of financial instruments, legal and regulatory reserves, and the determination of the provision for income taxes.</font></div></div>

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$ALLY
Ally Financial Inc. Stock $ally

2017 Q4 Form 10-K Financial Statement

#000004072918000035 Filed on February 21, 2018

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$ALLY Ally Financial Inc. Stock $ally

2017 Q4 Form 10-K Financial Statement

#000004072918000035 Filed on February 21, 2018

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$ALLY
Ally Financial Inc. Stock $ally