$CMA
Comerica Inc Stock $cma

$cma Overview Financials Valuation SEC Filings Company Website

2016 Q4 Form 10-K Financial Statement

#000002841218000065 Filed on February 15, 2018

Income Statement

Concept	2016 Q4	2016 Q3	2016 Q2
Revenue	$484.0M	$480.0M	$473.0M
YoY Change	5.91%	7.14%	6.53%
Cost Of Revenue
YoY Change
Gross Profit
YoY Change
Gross Profit Margin
Selling, General & Admin
YoY Change
% of Gross Profit
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$30.00M	$32.00M	$29.00M
YoY Change	7.14%	6.67%	-3.33%
% of Gross Profit
Operating Expenses
YoY Change
Operating Profit
YoY Change
Interest Expense	$29.00M	$30.00M	$28.00M
YoY Change	20.83%	15.38%	21.74%
% of Operating Profit
Other Income/Expense, Net
YoY Change
Pretax Income	$226.0M	$213.0M	$146.0M
YoY Change	43.95%	7.04%	-26.63%
Income Tax	$62.00M	$64.00M	$42.00M
% Of Pretax Income	27.43%	30.05%	28.77%
Net Earnings	$164.0M	$149.0M	$104.0M
YoY Change	41.38%	9.56%	-22.96%
Net Earnings / Revenue	33.88%	31.04%	21.99%
Basic Earnings Per Share	$0.95	$0.87	$0.60
Diluted Earnings Per Share	$0.92	$0.84	$0.58
COMMON SHARES
Basic Shares Outstanding	172.3M shares	171.0M shares	173.0M shares
Diluted Shares Outstanding		176.0M shares	177.0M shares

Balance Sheet

Concept	2016 Q4	2016 Q3	2016 Q2
SHORT-TERM ASSETS
Cash & Short-Term Investments
YoY Change
Cash & Equivalents	$7.218B	$8.040B	$4.110B
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	$501.0M	$528.0M	$544.0M
YoY Change	-8.91%	-2.4%	0.55%
Goodwill	$635.0M
YoY Change	0.0%
Intangibles
YoY Change
Long-Term Investments
YoY Change
Other Assets
YoY Change
Total Long-Term Assets
YoY Change
TOTAL ASSETS
Total Short-Term Assets
Total Long-Term Assets
Total Assets	$72.98B	$74.12B	$71.28B
YoY Change	1.53%	4.38%	1.91%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable
YoY Change
Accrued Expenses	$1.012B	$1.234B	$1.279B
YoY Change	-26.83%	-12.67%	1.11%
Deferred Revenue
YoY Change
Short-Term Debt	$25.00M	$12.00M	$12.00M
YoY Change	8.7%	-88.99%	-78.57%
Long-Term Debt Due
YoY Change
Total Short-Term Liabilities	$1.012B	$1.234B	$1.279B
YoY Change	-26.83%	-12.67%	1.11%
LONG-TERM LIABILITIES
Long-Term Debt	$2.360B	$3.090B	$3.121B
YoY Change	-22.83%	-0.32%	9.86%
Other Long-Term Liabilities
YoY Change
Total Long-Term Liabilities	$2.360B	$3.090B	$3.121B
YoY Change	-22.83%	-0.32%	9.86%
TOTAL LIABILITIES
Total Short-Term Liabilities	$1.012B	$1.234B	$1.279B
Total Long-Term Liabilities	$2.360B	$3.090B	$3.121B
Total Liabilities	$65.18B	$66.40B	$63.59B
YoY Change	1.34%	4.74%	1.86%
SHAREHOLDERS EQUITY
Retained Earnings	$7.331B	$7.262B	$7.157B
YoY Change	3.49%	3.64%	3.6%
Common Stock	$3.276B	$3.315B	$3.306B
YoY Change	-1.15%	0.27%	0.21%
Preferred Stock
YoY Change
Treasury Stock (at cost)	$2.428B	$2.558B	$2.474B
YoY Change	0.79%	9.04%	8.13%
Treasury Stock Shares	52.85M shares	56.10M shares	54.25M shares
Shareholders Equity	$7.796B	$7.727B	$7.694B
YoY Change
Total Liabilities & Shareholders Equity	$72.98B	$74.12B	$71.28B
YoY Change	1.53%	4.38%	1.91%

Cashflow Statement

Concept	2016 Q4	2016 Q3	2016 Q2
OPERATING ACTIVITIES
Net Income	$164.0M	$149.0M	$104.0M
YoY Change	41.38%	9.56%	-22.96%
Depreciation, Depletion And Amortization	$30.00M	$32.00M	$29.00M
YoY Change	7.14%	6.67%	-3.33%
Cash From Operating Activities	$89.00M	$153.0M	-$1.000M
YoY Change	-55.28%	-43.12%	-101.79%
INVESTING ACTIVITIES
Capital Expenditures	-$24.00M	-$17.00M	-$27.00M
YoY Change	-41.46%	-29.17%	-6.9%
Acquisitions
YoY Change
Other Investing Activities	$77.00M	$1.090B	-$1.095B
YoY Change	-103.51%	156.47%	22.48%
Cash From Investing Activities	$53.00M	$1.073B	-$1.122B
YoY Change	-102.37%	167.58%	21.56%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net
YoY Change
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	-964.0M	2.704B	2.231B
YoY Change	-198.37%	378.58%	156.44%
NET CHANGE
Cash From Operating Activities	89.00M	153.0M	-1.000M
Cash From Investing Activities	53.00M	1.073B	-1.122B
Cash From Financing Activities	-964.0M	2.704B	2.231B
Net Change In Cash	-822.0M	3.930B	1.108B
YoY Change	-21.94%	218.22%	36833.33%
FREE CASH FLOW
Cash From Operating Activities	$89.00M	$153.0M	-$1.000M
Capital Expenditures	-$24.00M	-$17.00M	-$27.00M
Free Cash Flow	$113.0M	$170.0M	$26.00M
YoY Change	-52.92%	-41.98%	-69.41%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
CY2015	cma	Accretion Of Discount On Receivables Acquired In Transfer AccretionOfDiscountOnReceivablesAcquiredInTransfer	7000000	USD
CY2016	cma	Accretion Of Discount On Receivables Acquired In Transfer AccretionOfDiscountOnReceivablesAcquiredInTransfer	4000000	USD
CY2017	cma	Accretion Of Discount On Receivables Acquired In Transfer AccretionOfDiscountOnReceivablesAcquiredInTransfer	3000000	USD
CY2015	cma	Adjustment To Paid In Capital Warrant Repurchased And Retired AdjustmentToPaidInCapitalWarrantRepurchasedAndRetired	-10000000	USD
CY2017Q4	cma	Allowance For Credit Losses Threshold For Individual Evaluation Nonaccrual Loans AllowanceForCreditLossesThresholdForIndividualEvaluationNonaccrualLoans	2000000	USD
CY2016Q4	cma	Allowance For Off Balance Sheet Credit Losses AllowanceForOffBalanceSheetCreditLosses	41000000	USD
CY2017Q4	cma	Allowance For Off Balance Sheet Credit Losses AllowanceForOffBalanceSheetCreditLosses	42000000	USD
CY2017	cma	Annual Contribution For Profit Sharing Plan To Individual Account Of Each Eligible Employee Maximum AnnualContributionForProfitSharingPlanToIndividualAccountOfEachEligibleEmployeeMaximum	0.08
CY2017	cma	Annual Contribution For Profit Sharing Plan To Individual Account Of Each Eligible Employee Minimum AnnualContributionForProfitSharingPlanToIndividualAccountOfEachEligibleEmployeeMinimum	0.03
CY2016Q4	cma	Assets Fair Value Disclosure Excluding Assets Valuedat Nav AssetsFairValueDisclosureExcludingAssetsValuedatNAV	2033000000	USD
CY2017Q4	cma	Assets Fair Value Disclosure Excluding Assets Valuedat Nav AssetsFairValueDisclosureExcludingAssetsValuedatNAV	2288000000	USD
CY2015	cma	Average Balance During Period Deposits AverageBalanceDuringPeriodDeposits	58326000000	USD
CY2016	cma	Average Balance During Period Deposits AverageBalanceDuringPeriodDeposits	57741000000	USD
CY2017	cma	Average Balance During Period Deposits AverageBalanceDuringPeriodDeposits	57258000000	USD
CY2015	cma	Average Balance During Period Loans And Leases Receivable Net Of Deferred Income AverageBalanceDuringPeriodLoansAndLeasesReceivableNetOfDeferredIncome	48628000000	USD
CY2016	cma	Average Balance During Period Loans And Leases Receivable Net Of Deferred Income AverageBalanceDuringPeriodLoansAndLeasesReceivableNetOfDeferredIncome	48996000000	USD
CY2017	cma	Average Balance During Period Loans And Leases Receivable Net Of Deferred Income AverageBalanceDuringPeriodLoansAndLeasesReceivableNetOfDeferredIncome	48558000000	USD
CY2016	cma	Average Reserve Requirement AverageReserveRequirement	518000000	USD
CY2017	cma	Average Reserve Requirement AverageReserveRequirement	572000000	USD
CY2016Q4	cma	Carrying Value Of Standby And Commercial Letters Of Credit CarryingValueOfStandbyAndCommercialLettersOfCredit	44000000	USD
CY2017Q4	cma	Carrying Value Of Standby And Commercial Letters Of Credit CarryingValueOfStandbyAndCommercialLettersOfCredit	40000000	USD
CY2016Q4	cma	Carrying Value Of Standby And Commercial Letters Of Credit Included In Allowance For Credit Losses On Lending Related Commitments CarryingValueOfStandbyAndCommercialLettersOfCreditIncludedInAllowanceForCreditLossesOnLendingRelatedCommitments	12000000	USD
CY2017Q4	cma	Carrying Value Of Standby And Commercial Letters Of Credit Included In Allowance For Credit Losses On Lending Related Commitments CarryingValueOfStandbyAndCommercialLettersOfCreditIncludedInAllowanceForCreditLossesOnLendingRelatedCommitments	15000000	USD
CY2016Q4	cma	Carrying Value Of Standby And Commercial Letters Of Credit Included In Deferred Fees CarryingValueOfStandbyAndCommercialLettersOfCreditIncludedInDeferredFees	32000000	USD
CY2017Q4	cma	Carrying Value Of Standby And Commercial Letters Of Credit Included In Deferred Fees CarryingValueOfStandbyAndCommercialLettersOfCreditIncludedInDeferredFees	25000000	USD
CY2016Q4	cma	Carrying Value Of Unused Commitments To Extend Credit CarryingValueOfUnusedCommitmentsToExtendCredit	29000000	USD
CY2017Q4	cma	Carrying Value Of Unused Commitments To Extend Credit CarryingValueOfUnusedCommitmentsToExtendCredit	27000000	USD
CY2017Q4	cma	Cash Collateral Posted For Derivatives In Liability Position CashCollateralPostedForDerivativesInLiabilityPosition	40000000	USD
CY2015	cma	Cash Dividends Paid To Parent Company By Bank Subsidiaries CashDividendsPaidToParentCompanyByBankSubsidiaries	437000000	USD
CY2016	cma	Cash Dividends Paid To Parent Company By Bank Subsidiaries CashDividendsPaidToParentCompanyByBankSubsidiaries	545000000	USD
CY2017	cma	Cash Dividends Paid To Parent Company By Bank Subsidiaries CashDividendsPaidToParentCompanyByBankSubsidiaries	907000000	USD
CY2015	cma	Commercial Lending Fees CommercialLendingFees	99000000	USD
CY2016	cma	Commercial Lending Fees CommercialLendingFees	89000000	USD
CY2017	cma	Commercial Lending Fees CommercialLendingFees	85000000	USD
CY2015	cma	Deferred Tax Adjustmentfor Tax Cutad Job Act Percentage DeferredTaxAdjustmentforTaxCutadJobActPercentage	0.000
CY2016	cma	Deferred Tax Adjustmentfor Tax Cutad Job Act Percentage DeferredTaxAdjustmentforTaxCutadJobActPercentage	0.000
CY2017	cma	Deferred Tax Adjustmentfor Tax Cutad Job Act Percentage DeferredTaxAdjustmentforTaxCutadJobActPercentage	0.087
CY2016Q4	cma	Deferred Tax Assets Deferred Loan Orgination Fees And Costs DeferredTaxAssetsDeferredLoanOrginationFeesAndCosts	20000000	USD
CY2017Q4	cma	Deferred Tax Assets Deferred Loan Orgination Fees And Costs DeferredTaxAssetsDeferredLoanOrginationFeesAndCosts	6000000	USD
CY2016Q4	cma	Deferred Tax Liabilities Tax Deferred Income Compensationand Benefits Pensions DeferredTaxLiabilitiesTaxDeferredIncomeCompensationandBenefitsPensions	82000000	USD
CY2017Q4	cma	Deferred Tax Liabilities Tax Deferred Income Compensationand Benefits Pensions DeferredTaxLiabilitiesTaxDeferredIncomeCompensationandBenefitsPensions	72000000	USD
CY2015	cma	Deferredtaxadjustmentfor Tax Cutand Jobact DeferredtaxadjustmentforTaxCutandJobact	0	USD
CY2016	cma	Deferredtaxadjustmentfor Tax Cutand Jobact DeferredtaxadjustmentforTaxCutandJobact	0	USD
CY2017	cma	Deferredtaxadjustmentfor Tax Cutand Jobact DeferredtaxadjustmentforTaxCutandJobact	107000000	USD
CY2017	cma	Defined Benefit Plan Actuarial Gain Loss Amortization Adjustment Allowable Percentage DefinedBenefitPlanActuarialGainLossAmortizationAdjustmentAllowablePercentage	0.10
CY2017	cma	Defined Benefit Plan Investment Gain Loss Amortization Adjustment Allowable Percentage DefinedBenefitPlanInvestmentGainLossAmortizationAdjustmentAllowablePercentage	0.10
CY2017	cma	Defined Benefit Plan Market Related Value Plan Assets Amortization Period DefinedBenefitPlanMarketRelatedValuePlanAssetsAmortizationPeriod	P5Y
CY2017	cma	Defined Contribution Plan Total Qualified Earnings Matching Cash Contributions By Employer Percent DefinedContributionPlanTotalQualifiedEarningsMatchingCashContributionsByEmployerPercent	1.00
CY2017	cma	Delinquency Status Unpaid Scheduled Monthly Payment DelinquencyStatusUnpaidScheduledMonthlyPayment	P30D
CY2016Q4	cma	Deposits Customer Certificates Deposits DepositsCustomerCertificatesDeposits	2806000000	USD
CY2017Q4	cma	Deposits Customer Certificates Deposits DepositsCustomerCertificatesDeposits	2165000000	USD
CY2017Q4	cma	Derivative Assets Cash Collateral DerivativeAssetsCashCollateral	1000000	USD
CY2016Q4	cma	Domestic Time Deposits250000or More DomesticTimeDeposits250000orMore	882000000	USD
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CY2015	cma	Effective Income Tax Rate Reconciliation Interest On Income Tax Liabilities EffectiveIncomeTaxRateReconciliationInterestOnIncomeTaxLiabilities	0.001
CY2016	cma	Effective Income Tax Rate Reconciliation Interest On Income Tax Liabilities EffectiveIncomeTaxRateReconciliationInterestOnIncomeTaxLiabilities	0.005
CY2017	cma	Effective Income Tax Rate Reconciliation Interest On Income Tax Liabilities EffectiveIncomeTaxRateReconciliationInterestOnIncomeTaxLiabilities	0.003
CY2015	cma	Effective Income Tax Rate Reconciliation Lease Termination Transactions Amount EffectiveIncomeTaxRateReconciliationLeaseTerminationTransactionsAmount	-5000000	USD
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CY2017	cma	Effective Income Tax Rate Reconciliation Lease Termination Transactions Amount EffectiveIncomeTaxRateReconciliationLeaseTerminationTransactionsAmount	-2000000	USD
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CY2015	cma	Efficiency Ratio EfficiencyRatio	0.6693
CY2016	cma	Efficiency Ratio EfficiencyRatio	0.6753
CY2017	cma	Efficiency Ratio EfficiencyRatio	0.5857
CY2015	cma	Gain Losson Saleof Securities Net Excluding Derivative GainLossonSaleofSecuritiesNetExcludingDerivative	-2000000	USD
CY2016	cma	Gain Losson Saleof Securities Net Excluding Derivative GainLossonSaleofSecuritiesNetExcludingDerivative	0	USD
CY2017	cma	Gain Losson Saleof Securities Net Excluding Derivative GainLossonSaleofSecuritiesNetExcludingDerivative	0	USD
CY2015	cma	Income Loss From Continuing Operations Before Income Taxes IncomeLossFromContinuingOperationsBeforeIncomeTaxes	750000000	USD
CY2016	cma	Income Loss From Continuing Operations Before Income Taxes IncomeLossFromContinuingOperationsBeforeIncomeTaxes	670000000	USD
CY2017	cma	Income Loss From Continuing Operations Before Income Taxes IncomeLossFromContinuingOperationsBeforeIncomeTaxes	1234000000	USD
CY2015	cma	Income Tax Effects Allocated Directlyto Equity Employee Stock Options Percentage IncomeTaxEffectsAllocatedDirectlytoEquityEmployeeStockOptionsPercentage	0.000
CY2016	cma	Income Tax Effects Allocated Directlyto Equity Employee Stock Options Percentage IncomeTaxEffectsAllocatedDirectlytoEquityEmployeeStockOptionsPercentage	0.000
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CY2015	cma	Income Tax Reconciliation Interest On Income Tax Liabilities IncomeTaxReconciliationInterestOnIncomeTaxLiabilities	1000000	USD
CY2016	cma	Income Tax Reconciliation Interest On Income Tax Liabilities IncomeTaxReconciliationInterestOnIncomeTaxLiabilities	3000000	USD
CY2017	cma	Income Tax Reconciliation Interest On Income Tax Liabilities IncomeTaxReconciliationInterestOnIncomeTaxLiabilities	4000000	USD
CY2015	cma	Interest And Dividend Income Securities Afs And Htm InterestAndDividendIncomeSecuritiesAFSAndHTM	216000000	USD
CY2016	cma	Interest And Dividend Income Securities Afs And Htm InterestAndDividendIncomeSecuritiesAFSAndHTM	247000000	USD
CY2017	cma	Interest And Dividend Income Securities Afs And Htm InterestAndDividendIncomeSecuritiesAFSAndHTM	250000000	USD
CY2015	cma	Lease Residual Transferredto Other Assets LeaseResidualTransferredtoOtherAssets	16000000	USD
CY2016	cma	Lease Residual Transferredto Other Assets LeaseResidualTransferredtoOtherAssets	0	USD
CY2017	cma	Lease Residual Transferredto Other Assets LeaseResidualTransferredtoOtherAssets	0	USD
CY2016Q4	cma	Leases Receivable Commercial Lease Financing Net Of Deferred Income LeasesReceivableCommercialLeaseFinancingNetOfDeferredIncome	572000000	USD
CY2017Q4	cma	Leases Receivable Commercial Lease Financing Net Of Deferred Income LeasesReceivableCommercialLeaseFinancingNetOfDeferredIncome	468000000	USD
CY2015	cma	Letter Of Credit Fees LetterOfCreditFees	53000000	USD
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CY2017Q4	cma	Liabilities Secured By Pledged Securities LiabilitiesSecuredByPledgedSecurities	500000000	USD
CY2016Q4	cma	Loans And Leases Receivable Consumer Loans Net Of Deferred Income LoansAndLeasesReceivableConsumerLoansNetOfDeferredIncome	2522000000	USD
CY2017Q4	cma	Loans And Leases Receivable Consumer Loans Net Of Deferred Income LoansAndLeasesReceivableConsumerLoansNetOfDeferredIncome	2554000000	USD
CY2016Q4	cma	Loans And Leases Receivable Consumer Mortgage Net Of Deferred Income LoansAndLeasesReceivableConsumerMortgageNetOfDeferredIncome	1942000000	USD
CY2017Q4	cma	Loans And Leases Receivable Consumer Mortgage Net Of Deferred Income LoansAndLeasesReceivableConsumerMortgageNetOfDeferredIncome	1988000000	USD
CY2016Q4	cma	Loans And Leases Receivable Foreign Net Of Deferred Income Other LoansAndLeasesReceivableForeignNetOfDeferredIncomeOther	1258000000	USD
CY2017Q4	cma	Loans And Leases Receivable Foreign Net Of Deferred Income Other LoansAndLeasesReceivableForeignNetOfDeferredIncomeOther	983000000	USD
CY2016Q4	cma	Loans Receivable Commercial Financial And Agricultural Net Of Deferred Income LoansReceivableCommercialFinancialAndAgriculturalNetOfDeferredIncome	30994000000	USD
CY2017Q4	cma	Loans Receivable Commercial Financial And Agricultural Net Of Deferred Income LoansReceivableCommercialFinancialAndAgriculturalNetOfDeferredIncome	31060000000	USD
CY2016Q4	cma	Loans Receivable Commercial Mortgage Net Of Deferred Income LoansReceivableCommercialMortgageNetOfDeferredIncome	8931000000	USD
CY2017Q4	cma	Loans Receivable Commercial Mortgage Net Of Deferred Income LoansReceivableCommercialMortgageNetOfDeferredIncome	9159000000	USD
CY2017	cma	Longest Expiration Year Letters Of Credit LongestExpirationYearLettersOfCredit	2023
CY2015	cma	Net Credit Related Charge Offs NetCreditRelatedChargeOffs	101000000	USD
CY2016	cma	Net Credit Related Charge Offs NetCreditRelatedChargeOffs	157000000	USD
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CY2016	cma	Net Increase In Fixed Assets NetIncreaseInFixedAssets	95000000	USD
CY2017	cma	Net Increase In Fixed Assets NetIncreaseInFixedAssets	69000000	USD
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CY2016Q4	cma	Non Interest Income Excluding Net Securities Gains NonInterestIncomeExcludingNetSecuritiesGains	269000000	USD
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CY2017Q4	cma	Non Interest Income Excluding Net Securities Gains NonInterestIncomeExcludingNetSecuritiesGains	285000000	USD
CY2016Q4	cma	Notional Amount Of Derivative Credit Risk Participation Agreements NotionalAmountOfDerivativeCreditRiskParticipationAgreements	458000000	USD
CY2017Q4	cma	Notional Amount Of Derivative Credit Risk Participation Agreements NotionalAmountOfDerivativeCreditRiskParticipationAgreements	549000000	USD
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CY2017	cma	Other Comprehensive Income Loss Reclassification Adjustment Pension And Other Postretirement Benefit Plans Recognized In Net Periodic Defined Benefit Cost Tax OtherComprehensiveIncomeLossReclassificationAdjustmentPensionAndOtherPostretirementBenefitPlansRecognizedInNetPeriodicDefinedBenefitCostTax	8000000	USD
CY2015	cma	Other Comprehensive Income Loss Reclassification From Aoci For Amortization Of Yield Adjustment Tax OtherComprehensiveIncomeLossReclassificationFromAOCIForAmortizationOfYieldAdjustmentTax	-3000000	USD
CY2016	cma	Other Comprehensive Income Loss Reclassification From Aoci For Amortization Of Yield Adjustment Tax OtherComprehensiveIncomeLossReclassificationFromAOCIForAmortizationOfYieldAdjustmentTax	-1000000	USD
CY2017	cma	Other Comprehensive Income Loss Reclassification From Aoci For Amortization Of Yield Adjustment Tax OtherComprehensiveIncomeLossReclassificationFromAOCIForAmortizationOfYieldAdjustmentTax	-1000000	USD
CY2015	cma	Other Comprehensiveincome Loss Reclassification Adjustment From Aoci For Amortization Of Unrealized Gains Losses On Securities Transferred From Available For Sale To Held To Maturity Net Of Tax OtherComprehensiveincomeLossReclassificationAdjustmentFromAOCIForAmortizationOfUnrealizedGainsLossesOnSecuritiesTransferredFromAvailableForSaleToHeldToMaturityNetOfTax	-5000000	USD
CY2016	cma	Other Comprehensiveincome Loss Reclassification Adjustment From Aoci For Amortization Of Unrealized Gains Losses On Securities Transferred From Available For Sale To Held To Maturity Net Of Tax OtherComprehensiveincomeLossReclassificationAdjustmentFromAOCIForAmortizationOfUnrealizedGainsLossesOnSecuritiesTransferredFromAvailableForSaleToHeldToMaturityNetOfTax	-2000000	USD
CY2017	cma	Other Comprehensiveincome Loss Reclassification Adjustment From Aoci For Amortization Of Unrealized Gains Losses On Securities Transferred From Available For Sale To Held To Maturity Net Of Tax OtherComprehensiveincomeLossReclassificationAdjustmentFromAOCIForAmortizationOfUnrealizedGainsLossesOnSecuritiesTransferredFromAvailableForSaleToHeldToMaturityNetOfTax	-2000000	USD
CY2015	cma	Outside Processing Fee Expense OutsideProcessingFeeExpense	318000000	USD
CY2016	cma	Outside Processing Fee Expense OutsideProcessingFeeExpense	336000000	USD
CY2017	cma	Outside Processing Fee Expense OutsideProcessingFeeExpense	366000000	USD
CY2015	cma	Profit Sharing Plan Costs Recognized ProfitSharingPlanCostsRecognized	10000000	USD
CY2016	cma	Profit Sharing Plan Costs Recognized ProfitSharingPlanCostsRecognized	10000000	USD
CY2017	cma	Profit Sharing Plan Costs Recognized ProfitSharingPlanCostsRecognized	0	USD
CY2016Q4	cma	Real Estate Construction Loans Net Of Deferred Income RealEstateConstructionLoansNetOfDeferredIncome	2869000000	USD
CY2017Q4	cma	Real Estate Construction Loans Net Of Deferred Income RealEstateConstructionLoansNetOfDeferredIncome	2961000000	USD
CY2015	cma	Reclassificationof Certain Tax Effectsfrom Accumulated Other Comprehensive Income ReclassificationofCertainTaxEffectsfromAccumulatedOtherComprehensiveIncome	0	USD
CY2016	cma	Reclassificationof Certain Tax Effectsfrom Accumulated Other Comprehensive Income ReclassificationofCertainTaxEffectsfromAccumulatedOtherComprehensiveIncome	0	USD
CY2017	cma	Reclassificationof Certain Tax Effectsfrom Accumulated Other Comprehensive Income ReclassificationofCertainTaxEffectsfromAccumulatedOtherComprehensiveIncome	-16000000	USD
CY2017	cma	Reclassificationof Certain Tax Effectsfrom Accumulated Other Comprehensive Income Total ReclassificationofCertainTaxEffectsfromAccumulatedOtherComprehensiveIncomeTotal	0	USD
CY2015	cma	Reclassificationof Certain Tax Effectsfrom Accumulated Other Comprehensive Incomefor Benefit Plans ReclassificationofCertainTaxEffectsfromAccumulatedOtherComprehensiveIncomeforBenefitPlans	0	USD
CY2016	cma	Reclassificationof Certain Tax Effectsfrom Accumulated Other Comprehensive Incomefor Benefit Plans ReclassificationofCertainTaxEffectsfromAccumulatedOtherComprehensiveIncomeforBenefitPlans	0	USD
CY2017	cma	Reclassificationof Certain Tax Effectsfrom Accumulated Other Comprehensive Incomefor Benefit Plans ReclassificationofCertainTaxEffectsfromAccumulatedOtherComprehensiveIncomeforBenefitPlans	-71000000	USD
CY2016Q4	cma	Reduced Rate Loans ReducedRateLoans	8000000	USD
CY2017Q4	cma	Reduced Rate Loans ReducedRateLoans	8000000	USD
CY2017	cma	Restructuring And Related Cost Expected Numberof Banking Center Consolidations RestructuringAndRelatedCostExpectedNumberofBankingCenterConsolidations	38
CY2015	cma	Return On Average Assets ReturnOnAverageAssets	0.0074
CY2016	cma	Return On Average Assets ReturnOnAverageAssets	0.0067
CY2017	cma	Return On Average Assets ReturnOnAverageAssets	0.0104
CY2016Q4	cma	Risk Participations Covering Standby And Commercial Letters Of Credit RiskParticipationsCoveringStandbyAndCommercialLettersOfCredit	255000000	USD
CY2017Q4	cma	Risk Participations Covering Standby And Commercial Letters Of Credit RiskParticipationsCoveringStandbyAndCommercialLettersOfCredit	127000000	USD
CY2015	cma	Segment Reporting Average Assets SegmentReportingAverageAssets	70247000000	USD
CY2016	cma	Segment Reporting Average Assets SegmentReportingAverageAssets	71743000000	USD
CY2017	cma	Segment Reporting Average Assets SegmentReportingAverageAssets	71452000000	USD
CY2017	cma	Share Repurchases Authorized In Capital Plan ShareRepurchasesAuthorizedInCapitalPlan	605000000	USD
CY2017Q4	cma	Share Repurchases Repurchasedper Capital Plan ShareRepurchasesRepurchasedperCapitalPlan	531000000	USD
CY2015	cma	Software Expenses SoftwareExpenses	99000000	USD
CY2016	cma	Software Expenses SoftwareExpenses	119000000	USD
CY2017	cma	Software Expenses SoftwareExpenses	126000000	USD
CY2015	cma	Stock Issued During Period Value Warrants Exercised StockIssuedDuringPeriodValueWarrantsExercised	0	USD
CY2016	cma	Stock Issued During Period Value Warrants Exercised StockIssuedDuringPeriodValueWarrantsExercised	0	USD
CY2017	cma	Stock Issued During Period Value Warrants Exercised StockIssuedDuringPeriodValueWarrantsExercised	0	USD
CY2016Q4	cma	Total Automotive Exposure TotalAutomotiveExposure	11264000000	USD
CY2017Q4	cma	Total Automotive Exposure TotalAutomotiveExposure	11844000000	USD
CY2016Q4	cma	Total Automotive Loans TotalAutomotiveLoans	8449000000	USD
CY2017Q4	cma	Total Automotive Loans TotalAutomotiveLoans	8936000000	USD
CY2016Q4	cma	Total Internally Classified Watch List Letters Of Credit TotalInternallyClassifiedWatchListLettersOfCredit	135000000	USD
CY2017Q4	cma	Total Internally Classified Watch List Letters Of Credit TotalInternallyClassifiedWatchListLettersOfCredit	88000000	USD
CY2016Q4	cma	Total Nonperforming Assets TotalNonperformingAssets	607000000	USD
CY2017Q4	cma	Total Nonperforming Assets TotalNonperformingAssets	415000000	USD
CY2016Q4	cma	Total Nonperforming Loans TotalNonperformingLoans	590000000	USD
CY2017Q4	cma	Total Nonperforming Loans TotalNonperformingLoans	410000000	USD
CY2016	cma	Unrealized Losseson Availableforsale Securities Transferredto Heldtomaturity UnrealizedLossesonAvailableforsaleSecuritiesTransferredtoHeldtomaturity	12000000	USD
CY2017	cma	Unrealized Losseson Availableforsale Securities Transferredto Heldtomaturity UnrealizedLossesonAvailableforsaleSecuritiesTransferredtoHeldtomaturity	9000000	USD
CY2015	cma	Unrecognized Tax Benefits Decrease Resultingfrom Other Tax Position Changes UnrecognizedTaxBenefitsDecreaseResultingfromOtherTaxPositionChanges	0	USD
CY2016	cma	Unrecognized Tax Benefits Decrease Resultingfrom Other Tax Position Changes UnrecognizedTaxBenefitsDecreaseResultingfromOtherTaxPositionChanges	0	USD
CY2017	cma	Unrecognized Tax Benefits Decrease Resultingfrom Other Tax Position Changes UnrecognizedTaxBenefitsDecreaseResultingfromOtherTaxPositionChanges	-1000000	USD
CY2016Q4	cma	Watch List Letters Of Credit As Percentage Of Total Letters Of Credit WatchListLettersOfCreditAsPercentageOfTotalLettersOfCredit	0.037
CY2017Q4	cma	Watch List Letters Of Credit As Percentage Of Total Letters Of Credit WatchListLettersOfCreditAsPercentageOfTotalLettersOfCredit	0.027
CY2017	dei	Amendment Flag AmendmentFlag	false
CY2017	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
CY2017	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	FY
CY2017	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2017
CY2017	dei	Document Period End Date DocumentPeriodEndDate	2017-12-31
CY2017	dei	Document Type DocumentType	10-K
CY2017	dei	Entity Central Index Key EntityCentralIndexKey	0000028412
CY2018Q1	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	172813294	shares
CY2017	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
CY2017	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
CY2017Q2	dei	Entity Public Float EntityPublicFloat	12665000000	USD
CY2017	dei	Entity Registrant Name EntityRegistrantName	Comerica INC /NEW/
CY2017	dei	Entity Voluntary Filers EntityVoluntaryFilers	No
CY2017	dei	Entity Well Known Seasoned Issuer EntityWellKnownSeasonedIssuer	Yes
CY2016Q4	invest	Derivative Notional Amount DerivativeNotionalAmount	20051000000	USD
CY2017Q4	invest	Derivative Notional Amount DerivativeNotionalAmount	20545000000	USD
CY2015	us-gaap	Accretion Amortization Of Discounts And Premiums Investments AccretionAmortizationOfDiscountsAndPremiumsInvestments	-13000000	USD
CY2016	us-gaap	Accretion Amortization Of Discounts And Premiums Investments AccretionAmortizationOfDiscountsAndPremiumsInvestments	-8000000	USD
CY2017	us-gaap	Accretion Amortization Of Discounts And Premiums Investments AccretionAmortizationOfDiscountsAndPremiumsInvestments	-6000000	USD
CY2016Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	915000000	USD
CY2017Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	916000000	USD
CY2014Q4	us-gaap	Accumulated Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	37000000	USD
CY2015Q4	us-gaap	Accumulated Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	9000000	USD
CY2016Q4	us-gaap	Accumulated Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	-33000000	USD
CY2017Q4	us-gaap	Accumulated Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	-101000000	USD
CY2014Q4	us-gaap	Accumulated Other Comprehensive Income Loss Defined Benefit Pension And Other Postretirement Plans Net Of Tax AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax	-449000000	USD
CY2015Q4	us-gaap	Accumulated Other Comprehensive Income Loss Defined Benefit Pension And Other Postretirement Plans Net Of Tax AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax	-438000000	USD
CY2016Q4	us-gaap	Accumulated Other Comprehensive Income Loss Defined Benefit Pension And Other Postretirement Plans Net Of Tax AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax	-350000000	USD
CY2017Q4	us-gaap	Accumulated Other Comprehensive Income Loss Defined Benefit Pension And Other Postretirement Plans Net Of Tax AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax	-350000000	USD
CY2015Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-429000000	USD
CY2016Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-383000000	USD
CY2017Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-451000000	USD
CY2016Q4	us-gaap	Additional Paid In Capital Common Stock AdditionalPaidInCapitalCommonStock	2135000000	USD
CY2017Q4	us-gaap	Additional Paid In Capital Common Stock AdditionalPaidInCapitalCommonStock	2122000000	USD
CY2015	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	38000000	USD
CY2016	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	34000000	USD
CY2017	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	39000000	USD
CY2015	us-gaap	Advertising Expense AdvertisingExpense	24000000	USD
CY2016	us-gaap	Advertising Expense AdvertisingExpense	21000000	USD
CY2017	us-gaap	Advertising Expense AdvertisingExpense	28000000	USD
CY2015	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	38000000	USD
CY2016	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	34000000	USD
CY2017	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	39000000	USD
CY2016Q4	us-gaap	Assets Assets	72978000000	USD
CY2017Q4	us-gaap	Assets Assets	71567000000	USD
CY2017Q4	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	10978000000	USD
CY2016Q4	us-gaap	Available For Sale Securities AvailableForSaleSecurities	10787000000	USD
CY2017Q4	us-gaap	Available For Sale Securities AvailableForSaleSecurities	10938000000	USD
CY2016Q4	us-gaap	Available For Sale Securities Accumulated Gross Unrealized Gain Before Tax AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax	57000000	USD
CY2017Q4	us-gaap	Available For Sale Securities Accumulated Gross Unrealized Gain Before Tax AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax	23000000	USD
CY2016Q4	us-gaap	Available For Sale Securities Accumulated Gross Unrealized Loss Before Tax AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax	99000000	USD
CY2017Q4	us-gaap	Available For Sale Securities Accumulated Gross Unrealized Loss Before Tax AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax	146000000	USD
CY2016Q4	us-gaap	Available For Sale Securities Amortized Cost AvailableForSaleSecuritiesAmortizedCost	10829000000	USD
CY2017Q4	us-gaap	Available For Sale Securities Amortized Cost AvailableForSaleSecuritiesAmortizedCost	11061000000	USD
CY2016Q4	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position12 Months Or Longer Accumulated Loss AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss	32000000	USD
CY2017Q4	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position12 Months Or Longer Accumulated Loss AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss	127000000	USD
CY2016Q4	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Accumulated Loss AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLoss	120000000	USD
CY2017Q4	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Accumulated Loss AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLoss	175000000	USD
CY2016Q4	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Fair Value AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue	6750000000	USD
CY2017Q4	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Fair Value AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue	10624000000	USD
CY2016Q4	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Less Than12 Months Accumulated Loss AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss	88000000	USD
CY2017Q4	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Less Than12 Months Accumulated Loss AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss	48000000	USD
CY2016Q4	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Less Than Twelve Months Fair Value AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue	5555000000	USD
CY2017Q4	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Less Than Twelve Months Fair Value AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue	6572000000	USD
CY2016Q4	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or Longer Fair Value AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue	1195000000	USD
CY2017Q4	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or Longer Fair Value AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue	4052000000	USD
CY2017Q4	us-gaap	Available For Sale Securities Debt Maturities After Five Through Ten Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost	1690000000	USD
CY2017Q4	us-gaap	Available For Sale Securities Debt Maturities After Five Through Ten Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue	1697000000	USD
CY2017Q4	us-gaap	Available For Sale Securities Debt Maturities After One Through Five Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost	2956000000	USD
CY2017Q4	us-gaap	Available For Sale Securities Debt Maturities After One Through Five Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue	2939000000	USD
CY2017Q4	us-gaap	Available For Sale Securities Debt Maturities After Ten Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost	6332000000	USD
CY2017Q4	us-gaap	Available For Sale Securities Debt Maturities After Ten Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue	6220000000	USD
CY2017Q4	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	10856000000	USD
CY2015	us-gaap	Available For Sale Securities Gross Realized Gains AvailableForSaleSecuritiesGrossRealizedGains	0	USD
CY2016	us-gaap	Available For Sale Securities Gross Realized Gains AvailableForSaleSecuritiesGrossRealizedGains	0	USD
CY2017	us-gaap	Available For Sale Securities Gross Realized Gains AvailableForSaleSecuritiesGrossRealizedGains	2000000	USD
CY2015	us-gaap	Available For Sale Securities Gross Realized Losses AvailableForSaleSecuritiesGrossRealizedLosses	2000000	USD
CY2016	us-gaap	Available For Sale Securities Gross Realized Losses AvailableForSaleSecuritiesGrossRealizedLosses	5000000	USD
CY2017	us-gaap	Available For Sale Securities Gross Realized Losses AvailableForSaleSecuritiesGrossRealizedLosses	5000000	USD
CY2017Q4	us-gaap	Available For Sale Securities Pledged As Collateral AvailableForSaleSecuritiesPledgedAsCollateral	800000000	USD
CY2017Q4	us-gaap	Availableforsale Securities In Unrealized Loss Positions Qualitative Disclosure Number Of Positions1 AvailableforsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions1	354
CY2017	us-gaap	Average Term Of Credit Risk Derivatives1 AverageTermOfCreditRiskDerivatives1	P2Y6M18D
CY2015	us-gaap	Bank Owned Life Insurance Income BankOwnedLifeInsuranceIncome	40000000	USD
CY2016	us-gaap	Bank Owned Life Insurance Income BankOwnedLifeInsuranceIncome	42000000	USD
CY2017	us-gaap	Bank Owned Life Insurance Income BankOwnedLifeInsuranceIncome	43000000	USD
CY2015	us-gaap	Brokerage Commissions Revenue BrokerageCommissionsRevenue	17000000	USD
CY2016	us-gaap	Brokerage Commissions Revenue BrokerageCommissionsRevenue	19000000	USD
CY2017	us-gaap	Brokerage Commissions Revenue BrokerageCommissionsRevenue	23000000	USD
CY2016Q4	us-gaap	Buildings And Improvements Gross BuildingsAndImprovementsGross	831000000	USD
CY2017Q4	us-gaap	Buildings And Improvements Gross BuildingsAndImprovementsGross	813000000	USD
CY2016Q4	us-gaap	Capital Required To Be Well Capitalized To Risk Weighted Assets CapitalRequiredToBeWellCapitalizedToRiskWeightedAssets	0.10
CY2017Q4	us-gaap	Capital Required To Be Well Capitalized To Risk Weighted Assets CapitalRequiredToBeWellCapitalizedToRiskWeightedAssets	0.10
CY2014Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	6071000000	USD
CY2015Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	6147000000	USD
CY2016Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	7218000000	USD
CY2017Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	5845000000	USD
CY2015	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	76000000	USD
CY2016	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	1071000000	USD
CY2017	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	-1373000000	USD
CY2016Q4	us-gaap	Cash And Due From Banks CashAndDueFromBanks	1249000000	USD
CY2017Q4	us-gaap	Cash And Due From Banks CashAndDueFromBanks	1438000000	USD
CY2016	us-gaap	Change In Unrealized Gain Loss On Fair Value Hedging Instruments1 ChangeInUnrealizedGainLossOnFairValueHedgingInstruments1	60000000	USD
CY2017	us-gaap	Change In Unrealized Gain Loss On Fair Value Hedging Instruments1 ChangeInUnrealizedGainLossOnFairValueHedgingInstruments1	32000000	USD
CY2015	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.83
CY2016	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.89
CY2017	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	1.09
CY2016Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	5
CY2017Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	5
CY2016Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	325000000	shares
CY2017Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	325000000	shares
CY2016Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	228164824	shares
CY2017Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	228164824	shares
CY2016Q4	us-gaap	Common Stock Value CommonStockValue	1141000000	USD
CY2017Q4	us-gaap	Common Stock Value CommonStockValue	1141000000	USD
CY2015	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	504000000	USD
CY2016Q1	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	161000000	USD
CY2016Q2	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	137000000	USD
CY2016Q3	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	152000000	USD
CY2016Q4	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	73000000	USD
CY2016	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	523000000	USD
CY2017Q1	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	206000000	USD
CY2017Q2	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	221000000	USD
CY2017Q3	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	228000000	USD
CY2017Q4	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	107000000	USD
CY2017	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	762000000	USD
CY2016Q4	us-gaap	Credit Derivative Maximum Exposure Undiscounted CreditDerivativeMaximumExposureUndiscounted	3000000	USD
CY2017Q4	us-gaap	Credit Derivative Maximum Exposure Undiscounted CreditDerivativeMaximumExposureUndiscounted	0	USD
CY2015	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	275000000	USD
CY2016	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	224000000	USD
CY2017	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	371000000	USD
CY2015	us-gaap	Current Foreign Tax Expense Benefit CurrentForeignTaxExpenseBenefit	5000000	USD
CY2016	us-gaap	Current Foreign Tax Expense Benefit CurrentForeignTaxExpenseBenefit	5000000	USD
CY2017	us-gaap	Current Foreign Tax Expense Benefit CurrentForeignTaxExpenseBenefit	5000000	USD
CY2015	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	300000000	USD
CY2016	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	244000000	USD
CY2017	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	412000000	USD
CY2015	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	20000000	USD
CY2016	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	15000000	USD
CY2017	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	36000000	USD
CY2017Q4	us-gaap	Debt Instrument Carrying Amount DebtInstrumentCarryingAmount	4575000000	USD
CY2017Q4	us-gaap	Decrease In Unrecognized Tax Benefits Is Reasonably Possible DecreaseInUnrecognizedTaxBenefitsIsReasonablyPossible	1000000	USD
CY2015	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	-68000000	USD
CY2016	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	-49000000	USD
CY2017	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	-26000000	USD
CY2015	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-71000000	USD
CY2016	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-51000000	USD
CY2017	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	79000000	USD
CY2016Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	243000000	USD
CY2017Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	149000000	USD
CY2015	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	-3000000	USD
CY2016	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	-2000000	USD
CY2017	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	-2000000	USD
CY2016Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	463000000	USD
CY2017Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	293000000	USD
CY2016Q4	us-gaap	Deferred Tax Assets Liabilities Net DeferredTaxAssetsLiabilitiesNet	217000000	USD
CY2017Q4	us-gaap	Deferred Tax Assets Liabilities Net DeferredTaxAssetsLiabilitiesNet	141000000	USD
CY2016Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	460000000	USD
CY2017Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	290000000	USD
CY2017Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards State And Local DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal	4000000	USD
CY2016Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	76000000	USD
CY2017Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	57000000	USD
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CY2017Q4	us-gaap	Deferred Tax Assets Unrealized Losses On Availablefor Sale Securities Gross DeferredTaxAssetsUnrealizedLossesOnAvailableforSaleSecuritiesGross	31000000	USD
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CY2017Q4	us-gaap	Defined Benefit Plan Expected Amortization Of Prior Service Cost Credit Next Fiscal Year DefinedBenefitPlanExpectedAmortizationOfPriorServiceCostCreditNextFiscalYear	27000000	USD
CY2017Q4	us-gaap	Defined Benefit Plan Expected Future Employer Contributions Next Fiscal Year DefinedBenefitPlanExpectedFutureEmployerContributionsNextFiscalYear	0	USD
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CY2017Q4	us-gaap	Defined Benefit Plan Fair Value Of Plan Assets DefinedBenefitPlanFairValueOfPlanAssets	2743000000	USD
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CY2017	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	21000000	USD
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CY2017Q4	us-gaap	Deposits Money Market Deposits And Negotiable Order Of Withdrawal Now DepositsMoneyMarketDepositsAndNegotiableOrderOfWithdrawalNOW	21500000000	USD
CY2016Q4	us-gaap	Deposits Savings Deposits DepositsSavingsDeposits	2064000000	USD
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CY2017	us-gaap	Depreciation And Amortization DepreciationAndAmortization	121000000	USD
CY2016Q4	us-gaap	Derivative Asset Collateral Obligation To Return Cash Offset DerivativeAssetCollateralObligationToReturnCashOffset	47000000	USD
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CY2017Q4	us-gaap	Derivative Asset Fair Value Gross Liability DerivativeAssetFairValueGrossLiability	49000000	USD
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CY2017Q4	us-gaap	Derivative Assets DerivativeAssets	142000000	USD
CY2016Q4	us-gaap	Derivative Collateral Obligation To Return Securities DerivativeCollateralObligationToReturnSecurities	19000000	USD
CY2017Q4	us-gaap	Derivative Collateral Obligation To Return Securities DerivativeCollateralObligationToReturnSecurities	3000000	USD
CY2016Q4	us-gaap	Derivative Collateral Right To Reclaim Securities DerivativeCollateralRightToReclaimSecurities	8000000	USD
CY2017Q4	us-gaap	Derivative Collateral Right To Reclaim Securities DerivativeCollateralRightToReclaimSecurities	24000000	USD
CY2016Q4	us-gaap	Derivative Credit Risk Valuation Adjustment Derivative Assets DerivativeCreditRiskValuationAdjustmentDerivativeAssets	5000000	USD
CY2017Q4	us-gaap	Derivative Credit Risk Valuation Adjustment Derivative Assets DerivativeCreditRiskValuationAdjustmentDerivativeAssets	4000000	USD
CY2016Q4	us-gaap	Derivative Fair Value Of Derivative Asset DerivativeFairValueOfDerivativeAsset	407000000	USD
CY2017Q4	us-gaap	Derivative Fair Value Of Derivative Asset DerivativeFairValueOfDerivativeAsset	192000000	USD
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CY2017Q4	us-gaap	Derivative Fair Value Of Derivative Asset Amount Offset Against Collateral DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCollateral	139000000	USD
CY2016Q4	us-gaap	Derivative Fair Value Of Derivative Liability DerivativeFairValueOfDerivativeLiability	254000000	USD
CY2017Q4	us-gaap	Derivative Fair Value Of Derivative Liability DerivativeFairValueOfDerivativeLiability	190000000	USD
CY2016Q4	us-gaap	Derivative Fair Value Of Derivative Liability Amount Offset Against Collateral DerivativeFairValueOfDerivativeLiabilityAmountOffsetAgainstCollateral	117000000	USD
CY2017Q4	us-gaap	Derivative Fair Value Of Derivative Liability Amount Offset Against Collateral DerivativeFairValueOfDerivativeLiabilityAmountOffsetAgainstCollateral	78000000	USD
CY2016Q4	us-gaap	Derivative Liabilities DerivativeLiabilities	125000000	USD
CY2017Q4	us-gaap	Derivative Liabilities DerivativeLiabilities	102000000	USD
CY2016Q4	us-gaap	Derivative Liability Collateral Right To Reclaim Cash Offset DerivativeLiabilityCollateralRightToReclaimCashOffset	45000000	USD
CY2017Q4	us-gaap	Derivative Liability Collateral Right To Reclaim Cash Offset DerivativeLiabilityCollateralRightToReclaimCashOffset	39000000	USD
CY2016Q4	us-gaap	Derivative Liability Fair Value Gross Asset DerivativeLiabilityFairValueGrossAsset	84000000	USD
CY2017Q4	us-gaap	Derivative Liability Fair Value Gross Asset DerivativeLiabilityFairValueGrossAsset	49000000	USD
CY2017Q4	us-gaap	Derivative Liability Fair Value Of Collateral DerivativeLiabilityFairValueOfCollateral	25000000	USD
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CY2017	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	193000000	USD
CY2015	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.93
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CY2016	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.74
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CY2017Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.29
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CY2017	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	4.23
CY2015	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.84
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CY2016Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.58
CY2016Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.84
CY2016Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.92
CY2016	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.68
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CY2017Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.26
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CY2017	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	4.14
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CY2017	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.398
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CY2017	us-gaap	Effective Income Tax Rate Reconciliation Tax Credits Other EffectiveIncomeTaxRateReconciliationTaxCreditsOther	0.017
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CY2017	us-gaap	Effective Income Tax Rate Reconciliation Tax Exempt Income EffectiveIncomeTaxRateReconciliationTaxExemptIncome	0.013
CY2017Q4	us-gaap	Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized	40000000	USD
CY2017	us-gaap	Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized Period For Recognition1 EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1	P2Y9M18D
CY2015	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	14000000	USD
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CY2017	us-gaap	Equipment Expense EquipmentExpense	45000000	USD
CY2017Q4	us-gaap	Fair Value Investments Entities That Calculate Net Asset Value Per Share Unfunded Committments FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerShareUnfundedCommittments	1000000	USD
CY2015	us-gaap	Federal Deposit Insurance Corporation Premium Expense FederalDepositInsuranceCorporationPremiumExpense	37000000	USD
CY2016	us-gaap	Federal Deposit Insurance Corporation Premium Expense FederalDepositInsuranceCorporationPremiumExpense	54000000	USD
CY2017	us-gaap	Federal Deposit Insurance Corporation Premium Expense FederalDepositInsuranceCorporationPremiumExpense	51000000	USD
CY2016Q4	us-gaap	Federal Home Loan Bank Stock FederalHomeLoanBankStock	122000000	USD
CY2017Q4	us-gaap	Federal Home Loan Bank Stock FederalHomeLoanBankStock	122000000	USD
CY2016Q4	us-gaap	Federal Reserve Bank Stock FederalReserveBankStock	85000000	USD
CY2017Q4	us-gaap	Federal Reserve Bank Stock FederalReserveBankStock	85000000	USD
CY2015	us-gaap	Fees And Commissions Credit And Debit Cards FeesAndCommissionsCreditAndDebitCards	276000000	USD
CY2016	us-gaap	Fees And Commissions Credit And Debit Cards FeesAndCommissionsCreditAndDebitCards	303000000	USD
CY2017	us-gaap	Fees And Commissions Credit And Debit Cards FeesAndCommissionsCreditAndDebitCards	333000000	USD
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CY2017	us-gaap	Fees And Commissions Fiduciary And Trust Activities FeesAndCommissionsFiduciaryAndTrustActivities	198000000	USD
CY2016	us-gaap	Financing Receivable Modifications Post Modification Recorded Investment2 FinancingReceivableModificationsPostModificationRecordedInvestment2	201000000	USD
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CY2016Q4	us-gaap	Financing Receivable Recorded Investment Current FinancingReceivableRecordedInvestmentCurrent	48358000000	USD
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CY2016Q4	us-gaap	Financing Receivable Recorded Investment Past Due FinancingReceivableRecordedInvestmentPastDue	148000000	USD
CY2017Q4	us-gaap	Financing Receivable Recorded Investment Past Due FinancingReceivableRecordedInvestmentPastDue	337000000	USD
CY2016Q4	us-gaap	Foreclosed Assets ForeclosedAssets	17000000	USD
CY2017Q4	us-gaap	Foreclosed Assets ForeclosedAssets	5000000	USD
CY2015	us-gaap	Foreign Currency Transaction Gain Loss Before Tax ForeignCurrencyTransactionGainLossBeforeTax	40000000	USD
CY2016	us-gaap	Foreign Currency Transaction Gain Loss Before Tax ForeignCurrencyTransactionGainLossBeforeTax	42000000	USD
CY2017	us-gaap	Foreign Currency Transaction Gain Loss Before Tax ForeignCurrencyTransactionGainLossBeforeTax	45000000	USD
CY2016Q4	us-gaap	Furniture And Fixtures Gross FurnitureAndFixturesGross	499000000	USD
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CY2016	us-gaap	Gain Loss On Foreign Currency Derivative Instruments Not Designated As Hedging Instruments GainLossOnForeignCurrencyDerivativeInstrumentsNotDesignatedAsHedgingInstruments	1000000	USD
CY2017	us-gaap	Gain Loss On Foreign Currency Derivative Instruments Not Designated As Hedging Instruments GainLossOnForeignCurrencyDerivativeInstrumentsNotDesignatedAsHedgingInstruments	0	USD
CY2016	us-gaap	Gain Loss On Foreign Currency Fair Value Hedge Derivatives GainLossOnForeignCurrencyFairValueHedgeDerivatives	0	USD
CY2017	us-gaap	Gain Loss On Foreign Currency Fair Value Hedge Derivatives GainLossOnForeignCurrencyFairValueHedgeDerivatives	0	USD
CY2016	us-gaap	Gain Loss On Interest Rate Fair Value Hedge Ineffectiveness GainLossOnInterestRateFairValueHedgeIneffectiveness	-2000000	USD
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CY2017	us-gaap	Gain Loss On Sale Of Other Assets GainLossOnSaleOfOtherAssets	3000000	USD
CY2015	us-gaap	Gain Loss On Sale Of Securities Net GainLossOnSaleOfSecuritiesNet	-2000000	USD
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CY2016	us-gaap	Gain Loss On Sale Of Securities Net GainLossOnSaleOfSecuritiesNet	-5000000	USD
CY2017Q1	us-gaap	Gain Loss On Sale Of Securities Net GainLossOnSaleOfSecuritiesNet	0	USD
CY2017Q2	us-gaap	Gain Loss On Sale Of Securities Net GainLossOnSaleOfSecuritiesNet	-2000000	USD
CY2017Q3	us-gaap	Gain Loss On Sale Of Securities Net GainLossOnSaleOfSecuritiesNet	-1000000	USD
CY2017Q4	us-gaap	Gain Loss On Sale Of Securities Net GainLossOnSaleOfSecuritiesNet	0	USD
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CY2016Q4	us-gaap	Goodwill Goodwill	635000000	USD
CY2017Q4	us-gaap	Goodwill Goodwill	635000000	USD
CY2016Q4	us-gaap	Held To Maturity Securities HeldToMaturitySecurities	1582000000	USD
CY2017Q4	us-gaap	Held To Maturity Securities HeldToMaturitySecurities	1266000000	USD
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CY2017Q4	us-gaap	Held To Maturity Securities Debt Maturities After One Through Five Years Fair Value HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue	0	USD
CY2017Q4	us-gaap	Held To Maturity Securities Debt Maturities After One Through Five Years Net Carrying Amount HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsNetCarryingAmount	0	USD
CY2017Q4	us-gaap	Held To Maturity Securities Debt Maturities After Ten Years Fair Value HeldToMaturitySecuritiesDebtMaturitiesAfterTenYearsFairValue	1229000000	USD
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CY2017Q4	us-gaap	Held To Maturity Securities Fair Value HeldToMaturitySecuritiesFairValue	1246000000	USD
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CY2017Q4	us-gaap	Impaired Financing Receivable Recorded Investment ImpairedFinancingReceivableRecordedInvestment	477000000	USD
CY2016Q4	us-gaap	Impaired Financing Receivable Related Allowance ImpairedFinancingReceivableRelatedAllowance	89000000	USD
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CY2016Q4	us-gaap	Impaired Financing Receivable With No Related Allowance Recorded Investment ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment	131000000	USD
CY2017Q4	us-gaap	Impaired Financing Receivable With No Related Allowance Recorded Investment ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment	173000000	USD
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CY2015	us-gaap	Income Tax Effects Allocated Directly To Equity Employee Stock Options IncomeTaxEffectsAllocatedDirectlyToEquityEmployeeStockOptions	0	USD
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CY2016Q2	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	42000000	USD
CY2016Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	64000000	USD
CY2016Q4	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	62000000	USD
CY2016	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	193000000	USD
CY2017Q1	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	66000000	USD
CY2017Q2	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	99000000	USD
CY2017Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	108000000	USD
CY2017Q4	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	218000000	USD
CY2017	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	491000000	USD
CY2015	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	262000000	USD
CY2016	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	235000000	USD
CY2017	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	432000000	USD
CY2015	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	-2000000	USD
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CY2017	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	0	USD
CY2015	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	10000000	USD
CY2016	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	8000000	USD
CY2017	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	22000000	USD
CY2015	us-gaap	Income Tax Reconciliation Tax Credits Other IncomeTaxReconciliationTaxCreditsOther	22000000	USD
CY2016	us-gaap	Income Tax Reconciliation Tax Credits Other IncomeTaxReconciliationTaxCreditsOther	22000000	USD
CY2017	us-gaap	Income Tax Reconciliation Tax Credits Other IncomeTaxReconciliationTaxCreditsOther	21000000	USD
CY2015	us-gaap	Income Tax Reconciliation Tax Exempt Income IncomeTaxReconciliationTaxExemptIncome	15000000	USD
CY2016	us-gaap	Income Tax Reconciliation Tax Exempt Income IncomeTaxReconciliationTaxExemptIncome	15000000	USD
CY2017	us-gaap	Income Tax Reconciliation Tax Exempt Income IncomeTaxReconciliationTaxExemptIncome	16000000	USD
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CY2016	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	151000000	USD
CY2017	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	336000000	USD
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CY2017	us-gaap	Incremental Common Shares Attributable To Call Options And Warrants IncrementalCommonSharesAttributableToCallOptionsAndWarrants	1000000	shares
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CY2016	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	2000000	shares
CY2017	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	3000000	shares
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CY2016Q3	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	480000000	USD
CY2016Q4	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	484000000	USD
CY2016	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	1909000000	USD
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CY2017Q4	us-gaap	Interest Bearing Deposit Liabilities InterestBearingDepositLiabilities	25832000000	USD
CY2016Q4	us-gaap	Interest Bearing Deposits In Banks InterestBearingDepositsInBanks	5969000000	USD
CY2017Q4	us-gaap	Interest Bearing Deposits In Banks InterestBearingDepositsInBanks	4407000000	USD
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CY2017Q4	us-gaap	Interest Bearing Foreign Deposit Time Deposits InterestBearingForeignDepositTimeDeposits	15000000	USD
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CY2016Q1	us-gaap	Interest Expense InterestExpense	25000000	USD
CY2016Q2	us-gaap	Interest Expense InterestExpense	28000000	USD
CY2016Q3	us-gaap	Interest Expense InterestExpense	30000000	USD
CY2016Q4	us-gaap	Interest Expense InterestExpense	29000000	USD
CY2016	us-gaap	Interest Expense InterestExpense	112000000	USD
CY2017Q1	us-gaap	Interest Expense InterestExpense	26000000	USD
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CY2017Q3	us-gaap	Interest Expense InterestExpense	33000000	USD
CY2017Q4	us-gaap	Interest Expense InterestExpense	33000000	USD
CY2017	us-gaap	Interest Expense InterestExpense	121000000	USD
CY2015	us-gaap	Interest Expense Deposits InterestExpenseDeposits	43000000	USD
CY2016	us-gaap	Interest Expense Deposits InterestExpenseDeposits	40000000	USD
CY2017	us-gaap	Interest Expense Deposits InterestExpenseDeposits	42000000	USD
CY2015	us-gaap	Interest Expense Long Term Debt InterestExpenseLongTermDebt	52000000	USD
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CY2016	us-gaap	Interest Expense Short Term Borrowings InterestExpenseShortTermBorrowings	0	USD
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CY2016	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	1797000000	USD
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CY2016	us-gaap	Interest Paid InterestPaid	111000000	USD
CY2017	us-gaap	Interest Paid InterestPaid	122000000	USD
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CY2017	us-gaap	Lease And Rental Expense LeaseAndRentalExpense	78000000	USD
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CY2017	us-gaap	Legal Fees LegalFees	15000000	USD
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CY2017Q4	us-gaap	Letters Of Credit Outstanding Amount LettersOfCreditOutstandingAmount	3300000000	USD
CY2016Q4	us-gaap	Liabilities Liabilities	65182000000	USD
CY2017Q4	us-gaap	Liabilities Liabilities	63604000000	USD
CY2016Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	72978000000	USD
CY2017Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	71567000000	USD
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CY2016Q4	us-gaap	Loans And Leases Receivable Allowance LoansAndLeasesReceivableAllowance	730000000	USD
CY2017Q4	us-gaap	Loans And Leases Receivable Allowance LoansAndLeasesReceivableAllowance	712000000	USD
CY2016Q4	us-gaap	Loans And Leases Receivable Deferred Income LoansAndLeasesReceivableDeferredIncome	147000000	USD
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CY2016Q4	us-gaap	Loans And Leases Receivable Net Of Deferred Income LoansAndLeasesReceivableNetOfDeferredIncome	49088000000	USD
CY2017Q4	us-gaap	Loans And Leases Receivable Net Of Deferred Income LoansAndLeasesReceivableNetOfDeferredIncome	49173000000	USD
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CY2017Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Next Twelve Months LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths	0	USD
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CY2017Q4	us-gaap	Mortgage Loans In Process Of Foreclosure Amount MortgageLoansInProcessOfForeclosureAmount	0	USD
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CY2016	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-270000000	USD
CY2017	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-138000000	USD
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CY2017	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	1103000000	USD
CY2015	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	515000000	USD
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CY2016	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	473000000	USD
CY2017Q1	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	200000000	USD
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CY2017Q4	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	112000000	USD
CY2017	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	738000000	USD
CY2016Q4	us-gaap	Noninterest Bearing Deposit Liabilities NoninterestBearingDepositLiabilities	31540000000	USD
CY2017Q4	us-gaap	Noninterest Bearing Deposit Liabilities NoninterestBearingDepositLiabilities	32071000000	USD
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CY2016Q1	us-gaap	Noninterest Expense NoninterestExpense	458000000	USD
CY2016Q2	us-gaap	Noninterest Expense NoninterestExpense	518000000	USD
CY2016Q3	us-gaap	Noninterest Expense NoninterestExpense	493000000	USD
CY2016Q4	us-gaap	Noninterest Expense NoninterestExpense	461000000	USD
CY2016	us-gaap	Noninterest Expense NoninterestExpense	1930000000	USD
CY2017Q1	us-gaap	Noninterest Expense NoninterestExpense	457000000	USD
CY2017Q2	us-gaap	Noninterest Expense NoninterestExpense	457000000	USD
CY2017Q3	us-gaap	Noninterest Expense NoninterestExpense	463000000	USD
CY2017Q4	us-gaap	Noninterest Expense NoninterestExpense	483000000	USD
CY2017	us-gaap	Noninterest Expense NoninterestExpense	1860000000	USD
CY2015	us-gaap	Noninterest Income NoninterestIncome	1035000000	USD
CY2016	us-gaap	Noninterest Income NoninterestIncome	1051000000	USD
CY2017	us-gaap	Noninterest Income NoninterestIncome	1107000000	USD
CY2015	us-gaap	Noninterest Income Other Operating Income NoninterestIncomeOtherOperatingIncome	102000000	USD
CY2016	us-gaap	Noninterest Income Other Operating Income NoninterestIncomeOtherOperatingIncome	102000000	USD
CY2017	us-gaap	Noninterest Income Other Operating Income NoninterestIncomeOtherOperatingIncome	111000000	USD
CY2017	us-gaap	Number Of Reporting Units NumberOfReportingUnits	3
CY2015	us-gaap	Occupancy Net OccupancyNet	159000000	USD
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CY2017	us-gaap	Occupancy Net OccupancyNet	154000000	USD
CY2017Q4	us-gaap	Operating Leases Future Minimum Payments Due OperatingLeasesFutureMinimumPaymentsDue	391000000	USD
CY2017Q4	us-gaap	Operating Leases Future Minimum Payments Due Current OperatingLeasesFutureMinimumPaymentsDueCurrent	68000000	USD
CY2017Q4	us-gaap	Operating Leases Future Minimum Payments Due In Five Years OperatingLeasesFutureMinimumPaymentsDueInFiveYears	32000000	USD
CY2017Q4	us-gaap	Operating Leases Future Minimum Payments Due In Four Years OperatingLeasesFutureMinimumPaymentsDueInFourYears	43000000	USD
CY2017Q4	us-gaap	Operating Leases Future Minimum Payments Due In Three Years OperatingLeasesFutureMinimumPaymentsDueInThreeYears	52000000	USD
CY2017Q4	us-gaap	Operating Leases Future Minimum Payments Due In Two Years OperatingLeasesFutureMinimumPaymentsDueInTwoYears	61000000	USD
CY2017Q4	us-gaap	Operating Leases Future Minimum Payments Due Thereafter OperatingLeasesFutureMinimumPaymentsDueThereafter	135000000	USD
CY2016Q4	us-gaap	Other Assets OtherAssets	4440000000	USD
CY2017Q4	us-gaap	Other Assets OtherAssets	4495000000	USD
CY2015	us-gaap	Other Comprehensive Income Defined Benefit Plan Net Prior Service Cost Credit Arising During Period Before Tax OtherComprehensiveIncomeDefinedBenefitPlanNetPriorServiceCostCreditArisingDuringPeriodBeforeTax	-3000000	USD
CY2016	us-gaap	Other Comprehensive Income Defined Benefit Plan Net Prior Service Cost Credit Arising During Period Before Tax OtherComprehensiveIncomeDefinedBenefitPlanNetPriorServiceCostCreditArisingDuringPeriodBeforeTax	-234000000	USD
CY2017	us-gaap	Other Comprehensive Income Defined Benefit Plan Net Prior Service Cost Credit Arising During Period Before Tax OtherComprehensiveIncomeDefinedBenefitPlanNetPriorServiceCostCreditArisingDuringPeriodBeforeTax	0	USD
CY2015	us-gaap	Other Comprehensive Income Defined Benefit Plans Net Unamortized Gain Loss Arising During Period Net Of Tax OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax	-35000000	USD
CY2016	us-gaap	Other Comprehensive Income Defined Benefit Plans Net Unamortized Gain Loss Arising During Period Net Of Tax OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax	63000000	USD
CY2017	us-gaap	Other Comprehensive Income Defined Benefit Plans Net Unamortized Gain Loss Arising During Period Net Of Tax OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax	55000000	USD
CY2015	us-gaap	Other Comprehensive Income Defined Benefit Plans Net Unamortized Gain Loss Arising During Period Tax OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodTax	-19000000	USD
CY2016	us-gaap	Other Comprehensive Income Defined Benefit Plans Net Unamortized Gain Loss Arising During Period Tax OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodTax	37000000	USD
CY2017	us-gaap	Other Comprehensive Income Defined Benefit Plans Net Unamortized Gain Loss Arising During Period Tax OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodTax	17000000	USD
CY2015	us-gaap	Other Comprehensive Income Loss Amortization Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Prior Service Cost Credit Before Tax OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditBeforeTax	1000000	USD
CY2016	us-gaap	Other Comprehensive Income Loss Amortization Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Prior Service Cost Credit Before Tax OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditBeforeTax	-7000000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Amortization Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Prior Service Cost Credit Before Tax OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditBeforeTax	-27000000	USD
CY2015	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Before Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeTax	-45000000	USD
CY2016	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Before Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeTax	-67000000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Before Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeTax	-78000000	USD
CY2015	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	-28000000	USD
CY2016	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	-42000000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	-52000000	USD
CY2015	us-gaap	Other Comprehensive Income Loss Before Tax OtherComprehensiveIncomeLossBeforeTax	-28000000	USD
CY2016	us-gaap	Other Comprehensive Income Loss Before Tax OtherComprehensiveIncomeLossBeforeTax	72000000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Before Tax OtherComprehensiveIncomeLossBeforeTax	18000000	USD
CY2015	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-17000000	USD
CY2016	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	46000000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	19000000	USD
CY2015	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Before Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeTax	-17000000	USD
CY2016	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Before Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeTax	-139000000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Before Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeTax	-96000000	USD
CY2015	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	-11000000	USD
CY2016	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	-88000000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	-71000000	USD
CY2015	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Net Unamortized Gain Loss Arising During Period Before Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansNetUnamortizedGainLossArisingDuringPeriodBeforeTax	-57000000	USD
CY2016	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Net Unamortized Gain Loss Arising During Period Before Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansNetUnamortizedGainLossArisingDuringPeriodBeforeTax	-134000000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Net Unamortized Gain Loss Arising During Period Before Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansNetUnamortizedGainLossArisingDuringPeriodBeforeTax	72000000	USD
CY2015	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax	-2000000	USD
CY2016	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax	0	USD
CY2017	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax	0	USD
CY2015	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax	-1000000	USD
CY2016	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax	0	USD
CY2017	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax	0	USD
CY2015	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax	-1000000	USD
CY2016	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax	0	USD
CY2017	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax	0	USD
CY2015	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansBeforeTax	-54000000	USD
CY2016	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansBeforeTax	100000000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansBeforeTax	72000000	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	-70000000	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	-46000000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Gain Loss Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossBeforeTax	-51000000	USD
CY2015	us-gaap	Other Comprehensive Income Loss Tax OtherComprehensiveIncomeLossTax	-11000000	USD
CY2016	us-gaap	Other Comprehensive Income Loss Tax OtherComprehensiveIncomeLossTax	26000000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Tax OtherComprehensiveIncomeLossTax	-1000000	USD
CY2015	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	-55000000	USD
CY2016	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	-70000000	USD
CY2017	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	-81000000	USD
CY2015	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	-34000000	USD
CY2016	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	-44000000	USD
CY2017	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	-54000000	USD
CY2015	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	-21000000	USD
CY2016	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	-26000000	USD
CY2017	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	-27000000	USD
CY2015	us-gaap	Other Interest And Dividend Income OtherInterestAndDividendIncome	17000000	USD
CY2016	us-gaap	Other Interest And Dividend Income OtherInterestAndDividendIncome	27000000	USD
CY2017	us-gaap	Other Interest And Dividend Income OtherInterestAndDividendIncome	60000000	USD
CY2016Q4	us-gaap	Other Liabilities OtherLiabilities	1012000000	USD
CY2017Q4	us-gaap	Other Liabilities OtherLiabilities	1069000000	USD
CY2015	us-gaap	Other Noninterest Expense OtherNoninterestExpense	160000000	USD
CY2016	us-gaap	Other Noninterest Expense OtherNoninterestExpense	135000000	USD
CY2017	us-gaap	Other Noninterest Expense OtherNoninterestExpense	135000000	USD
CY2016Q4	us-gaap	Other Short Term Investments OtherShortTermInvestments	92000000	USD
CY2017Q4	us-gaap	Other Short Term Investments OtherShortTermInvestments	96000000	USD
CY2015	us-gaap	Payments For Proceeds From Loans And Leases PaymentsForProceedsFromLoansAndLeases	644000000	USD
CY2016	us-gaap	Payments For Proceeds From Loans And Leases PaymentsForProceedsFromLoansAndLeases	136000000	USD
CY2017	us-gaap	Payments For Proceeds From Loans And Leases PaymentsForProceedsFromLoansAndLeases	175000000	USD
CY2015	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	-5000000	USD
CY2016	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	0	USD
CY2017	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	-3000000	USD
CY2015	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	240000000	USD
CY2016	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	315000000	USD
CY2017	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	552000000	USD
CY2015	us-gaap	Payments For Repurchase Of Warrants PaymentsForRepurchaseOfWarrants	10000000	USD
CY2016	us-gaap	Payments For Repurchase Of Warrants PaymentsForRepurchaseOfWarrants	0	USD
CY2017	us-gaap	Payments For Repurchase Of Warrants PaymentsForRepurchaseOfWarrants	0	USD
CY2016	us-gaap	Payments For Restructuring PaymentsForRestructuring	72000000	USD
CY2017	us-gaap	Payments For Restructuring PaymentsForRestructuring	43000000	USD
CY2015	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	147000000	USD
CY2016	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	152000000	USD
CY2017	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	180000000	USD
CY2015	us-gaap	Payments To Acquire Available For Sale Securities PaymentsToAcquireAvailableForSaleSecurities	4228000000	USD
CY2016	us-gaap	Payments To Acquire Available For Sale Securities PaymentsToAcquireAvailableForSaleSecurities	2045000000	USD
CY2017	us-gaap	Payments To Acquire Available For Sale Securities PaymentsToAcquireAvailableForSaleSecurities	3112000000	USD
CY2015	us-gaap	Payments To Acquire Federal Home Loan Bank Stock PaymentsToAcquireFederalHomeLoanBankStock	0	USD
CY2016	us-gaap	Payments To Acquire Federal Home Loan Bank Stock PaymentsToAcquireFederalHomeLoanBankStock	115000000	USD
CY2017	us-gaap	Payments To Acquire Federal Home Loan Bank Stock PaymentsToAcquireFederalHomeLoanBankStock	42000000	USD
CY2015	us-gaap	Payments To Acquire Held To Maturity Securities PaymentsToAcquireHeldToMaturitySecurities	362000000	USD
CY2016	us-gaap	Payments To Acquire Held To Maturity Securities PaymentsToAcquireHeldToMaturitySecurities	0	USD
CY2017	us-gaap	Payments To Acquire Held To Maturity Securities PaymentsToAcquireHeldToMaturitySecurities	0	USD
CY2015	us-gaap	Pension Expense PensionExpense	47000000	USD
CY2016	us-gaap	Pension Expense PensionExpense	6000000	USD
CY2017	us-gaap	Pension Expense PensionExpense	-18000000	USD
CY2017Q4	us-gaap	Pledged Financial Instruments Not Separately Reported Loans Receivable Pledged For Other Arrangements PledgedFinancialInstrumentsNotSeparatelyReportedLoansReceivablePledgedForOtherArrangements	21000000000	USD
CY2015	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	1016000000	USD
CY2016	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	2800000000	USD
CY2016	us-gaap	Proceeds From Issuance Of Shares Under Incentive And Share Based Compensation Plans Including Stock Options ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions	152000000	USD
CY2017	us-gaap	Proceeds From Issuance Of Shares Under Incentive And Share Based Compensation Plans Including Stock Options ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions	110000000	USD
CY2015	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	1757000000	USD
CY2017	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	0	USD
CY2015	us-gaap	Proceeds From Issuance Of Shares Under Incentive And Share Based Compensation Plans Including Stock Options ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions	22000000	USD
CY2016	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	1699000000	USD
CY2017	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	1615000000	USD
CY2015	us-gaap	Proceeds From Maturities Prepayments And Calls Of Held To Maturity Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfHeldToMaturitySecurities	324000000	USD
CY2016	us-gaap	Proceeds From Maturities Prepayments And Calls Of Held To Maturity Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfHeldToMaturitySecurities	402000000	USD
CY2017	us-gaap	Proceeds From Maturities Prepayments And Calls Of Held To Maturity Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfHeldToMaturitySecurities	319000000	USD
CY2015	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-5000000	USD
CY2016	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	0	USD
CY2017	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-5000000	USD
CY2015	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	-93000000	USD
CY2016	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	2000000	USD
CY2017	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	-15000000	USD
CY2015	us-gaap	Proceeds From Sale Of Available For Sale Securities ProceedsFromSaleOfAvailableForSaleSecurities	0	USD
CY2016	us-gaap	Proceeds From Sale Of Available For Sale Securities ProceedsFromSaleOfAvailableForSaleSecurities	0	USD
CY2017	us-gaap	Proceeds From Sale Of Available For Sale Securities ProceedsFromSaleOfAvailableForSaleSecurities	1259000000	USD
CY2015	us-gaap	Proceeds From Sale Of Federal Home Loan Bank Stock ProceedsFromSaleOfFederalHomeLoanBankStock	0	USD
CY2016	us-gaap	Proceeds From Sale Of Federal Home Loan Bank Stock ProceedsFromSaleOfFederalHomeLoanBankStock	0	USD
CY2017	us-gaap	Proceeds From Sale Of Federal Home Loan Bank Stock ProceedsFromSaleOfFederalHomeLoanBankStock	42000000	USD
CY2015	us-gaap	Proceeds From Sale Of Foreclosed Assets ProceedsFromSaleOfForeclosedAssets	12000000	USD
CY2016	us-gaap	Proceeds From Sale Of Foreclosed Assets ProceedsFromSaleOfForeclosedAssets	20000000	USD
CY2017	us-gaap	Proceeds From Sale Of Foreclosed Assets ProceedsFromSaleOfForeclosedAssets	22000000	USD
CY2015	us-gaap	Profit Loss ProfitLoss	521000000	USD
CY2016Q1	us-gaap	Profit Loss ProfitLoss	60000000	USD
CY2016Q2	us-gaap	Profit Loss ProfitLoss	104000000	USD
CY2016Q3	us-gaap	Profit Loss ProfitLoss	149000000	USD
CY2016Q4	us-gaap	Profit Loss ProfitLoss	164000000	USD
CY2016	us-gaap	Profit Loss ProfitLoss	477000000	USD
CY2017Q1	us-gaap	Profit Loss ProfitLoss	202000000	USD
CY2017Q2	us-gaap	Profit Loss ProfitLoss	203000000	USD
CY2017Q3	us-gaap	Profit Loss ProfitLoss	226000000	USD
CY2017Q4	us-gaap	Profit Loss ProfitLoss	112000000	USD
CY2017	us-gaap	Profit Loss ProfitLoss	743000000	USD
CY2016Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	1416000000	USD
CY2017Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	1382000000	USD
CY2016Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	501000000	USD
CY2017Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	466000000	USD
CY2015	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	147000000	USD
CY2016	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	248000000	USD
CY2017	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	74000000	USD
CY2015	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	147000000	USD
CY2016Q1	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	148000000	USD
CY2016Q2	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	49000000	USD
CY2016Q3	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	16000000	USD
CY2016Q4	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	35000000	USD
CY2016	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	248000000	USD
CY2017Q1	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	16000000	USD
CY2017Q2	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	17000000	USD
CY2017Q3	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	24000000	USD
CY2017Q4	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	17000000	USD
CY2017	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	74000000	USD
CY2015	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	606000000	USD
CY2016	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	650000000	USD
CY2017	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	500000000	USD
CY2015	us-gaap	Repayments Of Other Debt RepaymentsOfOtherDebt	0	USD
CY2016	us-gaap	Repayments Of Other Debt RepaymentsOfOtherDebt	0	USD
CY2017	us-gaap	Repayments Of Other Debt RepaymentsOfOtherDebt	16000000	USD
CY2017	us-gaap	Restructuring And Related Activities Completion Date RestructuringAndRelatedActivitiesCompletionDate	2018-12-31
CY2017Q4	us-gaap	Restructuring And Related Cost Cost Incurred To Date1 RestructuringAndRelatedCostCostIncurredToDate1	138000000	USD
CY2015	us-gaap	Restructuring Charges RestructuringCharges	0	USD
CY2016	us-gaap	Restructuring Charges RestructuringCharges	93000000	USD
CY2017	us-gaap	Restructuring Charges RestructuringCharges	45000000	USD
CY2015Q4	us-gaap	Restructuring Reserve RestructuringReserve	0	USD
CY2016Q4	us-gaap	Restructuring Reserve RestructuringReserve	18000000	USD
CY2017Q4	us-gaap	Restructuring Reserve RestructuringReserve	15000000	USD
CY2016	us-gaap	Restructuring Reserve Settled Without Cash2 RestructuringReserveSettledWithoutCash2	3000000	USD
CY2017	us-gaap	Restructuring Reserve Settled Without Cash2 RestructuringReserveSettledWithoutCash2	5000000	USD
CY2016Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	7331000000	USD
CY2017Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	7887000000	USD
CY2015	us-gaap	Share Based Compensation ShareBasedCompensation	38000000	USD
CY2016	us-gaap	Share Based Compensation ShareBasedCompensation	34000000	USD
CY2017	us-gaap	Share Based Compensation ShareBasedCompensation	39000000	USD
CY2015	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Dividend Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate	0.0300
CY2016	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Dividend Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate	0.0300
CY2017	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Dividend Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate	0.0300
CY2015	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Volatility Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate	0.33
CY2016	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Volatility Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate	0.38
CY2017	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Volatility Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate	0.34
CY2015	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Risk Free Interest Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate	0.0183
CY2016	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Risk Free Interest Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate	0.0201
CY2017	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Risk Free Interest Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate	0.0247
CY2017Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Authorized ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized	19400000	shares
CY2017Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Available For Grant ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant	9500000	shares
CY2015	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Total Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue	12000000	USD
CY2016	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Total Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue	46000000	USD
CY2017	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Total Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue	104000000	USD
CY2015	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue	11.31
CY2016	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue	9.94
CY2017	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue	19.61
CY2015	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Fair Value Assumptions Expected Term1 SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1	P6Y10M24D
CY2016	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Fair Value Assumptions Expected Term1 SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1	P6Y10M24D
CY2017	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Fair Value Assumptions Expected Term1 SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1	P7Y
CY2016Q4	us-gaap	Short Term Borrowings ShortTermBorrowings	25000000	USD
CY2017Q4	us-gaap	Short Term Borrowings ShortTermBorrowings	10000000	USD
CY2017Q4	us-gaap	Statutory Accounting Practices Statutory Amount Available For Dividend Payments With Regulatory Approval StatutoryAccountingPracticesStatutoryAmountAvailableForDividendPaymentsWithRegulatoryApproval	7000000	USD
CY2015	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	14000000	USD
CY2016	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	143000000	USD
CY2017	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	102000000	USD
CY2014Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	7402000000	USD
CY2015Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	7560000000	USD
CY2016Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	7796000000	USD
CY2017Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	7963000000	USD
CY2017	us-gaap	Stockholders Equity Other StockholdersEquityOther	0	USD
CY2016Q4	us-gaap	Tier One Risk Based Capital Required To Be Well Capitalized To Risk Weighted Assets TierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets	0.06
CY2017Q4	us-gaap	Tier One Risk Based Capital Required To Be Well Capitalized To Risk Weighted Assets TierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets	0.06
CY2017Q4	us-gaap	Time Deposit Maturities After Year Five TimeDepositMaturitiesAfterYearFive	15000000	USD
CY2017Q4	us-gaap	Time Deposit Maturities Year Five TimeDepositMaturitiesYearFive	16000000	USD
CY2017Q4	us-gaap	Time Deposit Maturities Year Four TimeDepositMaturitiesYearFour	28000000	USD
CY2017Q4	us-gaap	Time Deposit Maturities Year One TimeDepositMaturitiesYearOne	1855000000	USD
CY2017Q4	us-gaap	Time Deposit Maturities Year Three TimeDepositMaturitiesYearThree	66000000	USD
CY2017Q4	us-gaap	Time Deposit Maturities Year Two TimeDepositMaturitiesYearTwo	200000000	USD
CY2017Q4	us-gaap	Time Deposits TimeDeposits	2180000000	USD
CY2015	us-gaap	Transfer Of Loans Held For Sale To Portfolio Loans1 TransferOfLoansHeldForSaleToPortfolioLoans1	0	USD
CY2016	us-gaap	Transfer Of Loans Held For Sale To Portfolio Loans1 TransferOfLoansHeldForSaleToPortfolioLoans1	17000000	USD
CY2017	us-gaap	Transfer Of Loans Held For Sale To Portfolio Loans1 TransferOfLoansHeldForSaleToPortfolioLoans1	0	USD
CY2015	us-gaap	Transfer Of Portfolio Loans And Leases To Held For Sale1 TransferOfPortfolioLoansAndLeasesToHeldForSale1	28000000	USD
CY2016	us-gaap	Transfer Of Portfolio Loans And Leases To Held For Sale1 TransferOfPortfolioLoansAndLeasesToHeldForSale1	0	USD
CY2017	us-gaap	Transfer Of Portfolio Loans And Leases To Held For Sale1 TransferOfPortfolioLoansAndLeasesToHeldForSale1	0	USD
CY2015	us-gaap	Transfer To Other Real Estate TransferToOtherRealEstate	12000000	USD
CY2016	us-gaap	Transfer To Other Real Estate TransferToOtherRealEstate	21000000	USD
CY2017	us-gaap	Transfer To Other Real Estate TransferToOtherRealEstate	8000000	USD
CY2016Q4	us-gaap	Treasury Stock Shares TreasuryStockShares	52851156	shares
CY2017Q4	us-gaap	Treasury Stock Shares TreasuryStockShares	55306483	shares
CY2016Q4	us-gaap	Treasury Stock Value TreasuryStockValue	2428000000	USD
CY2017Q4	us-gaap	Treasury Stock Value TreasuryStockValue	2736000000	USD
CY2015	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	240000000	USD
CY2016	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	310000000	USD
CY2017	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	544000000	USD
CY2016Q4	us-gaap	Unamortized Debt Issuance Expense UnamortizedDebtIssuanceExpense	7000000	USD
CY2017Q4	us-gaap	Unamortized Debt Issuance Expense UnamortizedDebtIssuanceExpense	5000000	USD
CY2015	us-gaap	Undistributed Earnings Loss Allocated To Participating Securities Diluted UndistributedEarningsLossAllocatedToParticipatingSecuritiesDiluted	6000000	USD
CY2016Q1	us-gaap	Undistributed Earnings Loss Allocated To Participating Securities Diluted UndistributedEarningsLossAllocatedToParticipatingSecuritiesDiluted	1000000	USD
CY2016Q2	us-gaap	Undistributed Earnings Loss Allocated To Participating Securities Diluted UndistributedEarningsLossAllocatedToParticipatingSecuritiesDiluted	1000000	USD
CY2016Q3	us-gaap	Undistributed Earnings Loss Allocated To Participating Securities Diluted UndistributedEarningsLossAllocatedToParticipatingSecuritiesDiluted	1000000	USD
CY2016Q4	us-gaap	Undistributed Earnings Loss Allocated To Participating Securities Diluted UndistributedEarningsLossAllocatedToParticipatingSecuritiesDiluted	1000000	USD
CY2016	us-gaap	Undistributed Earnings Loss Allocated To Participating Securities Diluted UndistributedEarningsLossAllocatedToParticipatingSecuritiesDiluted	4000000	USD
CY2016Q4	us-gaap	Unrecognized Tax Benefits Income Tax Penalties And Interest Accrued UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued	7000000	USD
CY2017Q1	us-gaap	Undistributed Earnings Loss Allocated To Participating Securities Diluted UndistributedEarningsLossAllocatedToParticipatingSecuritiesDiluted	2000000	USD
CY2017Q2	us-gaap	Undistributed Earnings Loss Allocated To Participating Securities Diluted UndistributedEarningsLossAllocatedToParticipatingSecuritiesDiluted	1000000	USD
CY2017Q3	us-gaap	Undistributed Earnings Loss Allocated To Participating Securities Diluted UndistributedEarningsLossAllocatedToParticipatingSecuritiesDiluted	2000000	USD
CY2017Q4	us-gaap	Undistributed Earnings Loss Allocated To Participating Securities Diluted UndistributedEarningsLossAllocatedToParticipatingSecuritiesDiluted	0	USD
CY2017	us-gaap	Undistributed Earnings Loss Allocated To Participating Securities Diluted UndistributedEarningsLossAllocatedToParticipatingSecuritiesDiluted	5000000	USD
CY2014Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	14000000	USD
CY2015Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	22000000	USD
CY2016Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	15000000	USD
CY2017Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	10000000	USD
CY2015	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	0	USD
CY2016	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	7000000	USD
CY2017	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	8000000	USD
CY2017Q4	us-gaap	Unrecognized Tax Benefits Income Tax Penalties And Interest Accrued UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued	10000000	USD
CY2015	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	8000000	USD
CY2016	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	0	USD
CY2017	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	4000000	USD
CY2016Q4	us-gaap	Unrecognized Tax Benefits That Would Impact Effective Tax Rate UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate	4000000	USD
CY2017Q4	us-gaap	Unrecognized Tax Benefits That Would Impact Effective Tax Rate UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate	8000000	USD
CY2015	us-gaap	Variable Interest Entity Financial Or Other Support Amount VariableInterestEntityFinancialOrOtherSupportAmount	0	USD
CY2016	us-gaap	Variable Interest Entity Financial Or Other Support Amount VariableInterestEntityFinancialOrOtherSupportAmount	0	USD
CY2017	us-gaap	Variable Interest Entity Financial Or Other Support Amount VariableInterestEntityFinancialOrOtherSupportAmount	0	USD
CY2017Q4	us-gaap	Variable Interest Entity Nonconsolidated Carrying Amount Liabilities VariableInterestEntityNonconsolidatedCarryingAmountLiabilities	165000000	USD
CY2015	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	181000000	shares
CY2016	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	177000000	shares
CY2017	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	178000000	shares
CY2015	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	176000000	shares
CY2016	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	172000000	shares
CY2017	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	174000000	shares
CY2017	us-gaap	Guarantees Indemnifications And Warranties Policies GuaranteesIndemnificationsAndWarrantiesPolicies	<div style="font-family:Times New Roman;font-size:10pt;"><div style="line-height:120%;padding-top:8px;text-align:justify;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-weight:bold;">Financial Guarantees</font></div><div style="line-height:120%;padding-top:8px;text-align:justify;text-indent:49px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Certain guarantee contracts or indemnification agreements that contingently require the Corporation, as guarantor, to make payments to the guaranteed party are initially measured at fair value and included in “accrued expenses and other liabilities” on the consolidated balance sheets. The subsequent accounting for the liability depends on the nature of the underlying guarantee. The release from risk is accounted for under a particular guarantee when the guarantee expires or is settled, or by a systematic and rational amortization method.</font></div></div>

Files In Submission

Name	View Source	Status
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0000028412-18-000065-index.html	Edgar Link	pending
0000028412-18-000065.txt	Edgar Link	pending
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cma-20171231.xml	Edgar Link	completed
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$CMA
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2016 Q4 Form 10-K Financial Statement

#000002841218000065 Filed on February 15, 2018

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$CMA Comerica Inc Stock $cma

2016 Q4 Form 10-K Financial Statement

#000002841218000065 Filed on February 15, 2018

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$CMA
Comerica Inc Stock $cma