$CMA
Comerica Inc Stock $cma

$cma Overview Financials Valuation SEC Filings Company Website

2014 Q4 Form 10-K Financial Statement

#000002841216000196 Filed on February 26, 2016

Income Statement

Concept	2014 Q4	2014 Q3	2014 Q2
Revenue	$438.0M	$436.0M	$441.0M
YoY Change	-3.95%	-0.68%	-0.45%
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	$31.00M	$31.00M	$32.00M
YoY Change	3.33%	3.33%	0.0%
% of Gross Profit
Operating Expenses
YoY Change
Operating Profit
YoY Change
Interest Expense	$23.00M	$22.00M	$25.00M
YoY Change	-11.54%	-18.52%	-13.79%
% of Operating Profit
Other Income/Expense, Net
YoY Change
Pretax Income	$219.0M	$227.0M	$221.0M
YoY Change	5.29%	12.94%	6.76%
Income Tax	$70.00M	$73.00M	$70.00M
% Of Pretax Income	31.96%	32.16%	31.67%
Net Earnings	$149.0M	$154.0M	$151.0M
YoY Change	27.35%	4.76%	5.59%
Net Earnings / Revenue	34.02%	35.32%	34.24%
Basic Earnings Per Share	$0.83	$0.85	$0.83
Diluted Earnings Per Share	$0.80	$0.82	$0.80
COMMON SHARES
Basic Shares Outstanding	179.7M shares	179.0M shares	179.0M shares
Diluted Shares Outstanding		185.0M shares	186.0M shares

Balance Sheet

Concept	2014 Q4	2014 Q3	2014 Q2
SHORT-TERM ASSETS
Cash & Short-Term Investments
YoY Change
Cash & Equivalents	$6.071B	$7.787B	$3.894B
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	$532.0M	$524.0M	$562.0M
YoY Change	-10.44%	-13.25%	-6.95%
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	$69.19B	$68.89B	$65.33B
YoY Change	6.07%	6.52%	3.78%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable
YoY Change
Accrued Expenses	$1.507B	$1.002B	$990.0M
YoY Change	52.84%	0.1%	-5.62%
Deferred Revenue
YoY Change
Short-Term Debt	$116.0M	$202.0M	$176.0M
YoY Change	-54.15%	-10.62%	34.35%
Long-Term Debt Due
YoY Change
Total Short-Term Liabilities	$1.507B	$1.002B	$990.0M
YoY Change	52.84%	0.1%	-5.62%
LONG-TERM LIABILITIES
Long-Term Debt	$2.675B	$2.669B	$2.620B
YoY Change	-24.5%	-25.13%	-27.24%
Other Long-Term Liabilities
YoY Change
Total Long-Term Liabilities	$2.675B	$2.669B	$2.620B
YoY Change	-24.5%	-25.13%	-27.24%
TOTAL LIABILITIES
Total Short-Term Liabilities	$1.507B	$1.002B	$990.0M
Total Long-Term Liabilities	$2.675B	$2.669B	$2.620B
Total Liabilities	$61.78B	$61.45B	$57.96B
YoY Change	6.39%	6.5%	3.43%
SHAREHOLDERS EQUITY
Retained Earnings	$6.744B	$6.631B	$6.520B
YoY Change	6.74%	6.28%	6.41%
Common Stock	$3.329B	$3.324B	$3.316B
YoY Change	0.27%	0.36%	0.45%
Preferred Stock
YoY Change
Treasury Stock (at cost)	$2.259B	$2.205B	$2.163B
YoY Change	7.73%	8.04%	9.3%
Treasury Stock Shares	49.15M shares	47.99M shares	47.19M shares
Shareholders Equity	$7.402B	$7.433B	$7.369B
YoY Change
Total Liabilities & Shareholders Equity	$69.19B	$68.89B	$65.33B
YoY Change	6.07%	6.52%	3.78%

Cashflow Statement

Concept	2014 Q4	2014 Q3	2014 Q2
OPERATING ACTIVITIES
Net Income	$149.0M	$154.0M	$151.0M
YoY Change	27.35%	4.76%	5.59%
Depreciation, Depletion And Amortization	$31.00M	$31.00M	$32.00M
YoY Change	3.33%	3.33%	0.0%
Cash From Operating Activities	$74.00M	$219.0M	$132.0M
YoY Change	-82.63%	42.21%	-4500.0%
INVESTING ACTIVITIES
Capital Expenditures	-$32.00M	-$7.000M	-$15.00M
YoY Change	0.0%	-75.0%	-34.78%
Acquisitions
YoY Change
Other Investing Activities	-$1.384B	$197.0M	-$1.374B
YoY Change	15.53%	-86.22%	-2150.75%
Cash From Investing Activities	-$1.416B	$190.0M	-$1.389B
YoY Change	15.12%	-86.45%	-3256.82%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net
YoY Change
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	-374.0M	3.484B	-469.0M
YoY Change	-323.95%	116.8%	-72.62%
NET CHANGE
Cash From Operating Activities	74.00M	219.0M	132.0M
Cash From Investing Activities	-1.416B	190.0M	-1.389B
Cash From Financing Activities	-374.0M	3.484B	-469.0M
Net Change In Cash	-1.716B	3.893B	-1.726B
YoY Change	169.39%	23.08%	3.23%
FREE CASH FLOW
Cash From Operating Activities	$74.00M	$219.0M	$132.0M
Capital Expenditures	-$32.00M	-$7.000M	-$15.00M
Free Cash Flow	$106.0M	$226.0M	$147.0M
YoY Change	-76.86%	24.18%	635.0%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
CY2013	cma	Accretion Of Discount On Receivables Acquired In Transfer AccretionOfDiscountOnReceivablesAcquiredInTransfer	49000000	USD
CY2014	cma	Accretion Of Discount On Receivables Acquired In Transfer AccretionOfDiscountOnReceivablesAcquiredInTransfer	34000000	USD
CY2015	cma	Accretion Of Discount On Receivables Acquired In Transfer AccretionOfDiscountOnReceivablesAcquiredInTransfer	7000000	USD
CY2015	cma	Adjustment To Paid In Capital Warrant Repurchased And Retired AdjustmentToPaidInCapitalWarrantRepurchasedAndRetired	10000000	USD
CY2015Q4	cma	Allowance For Credit Losses Threshold For Individual Evaluation Nonaccrual Loans AllowanceForCreditLossesThresholdForIndividualEvaluationNonaccrualLoans	2000000	USD
CY2014Q4	cma	Allowance For Off Balance Sheet Credit Losses AllowanceForOffBalanceSheetCreditLosses	41000000	USD
CY2015Q4	cma	Allowance For Off Balance Sheet Credit Losses AllowanceForOffBalanceSheetCreditLosses	45000000	USD
CY2015	cma	Annual Contribution For Profit Sharing Plan To Individual Account Of Each Eligible Employee Maximum AnnualContributionForProfitSharingPlanToIndividualAccountOfEachEligibleEmployeeMaximum	0.08
CY2015	cma	Annual Contribution For Profit Sharing Plan To Individual Account Of Each Eligible Employee Minimum AnnualContributionForProfitSharingPlanToIndividualAccountOfEachEligibleEmployeeMinimum	0.03
CY2015	cma	Ars Portfolio Redeemed Or Sold Since Acquisition Above Or At Cost Percentage ArsPortfolioRedeemedOrSoldSinceAcquisitionAboveOrAtCostPercentage	0.91
CY2015	cma	Ars Portfolio Redeemed Or Sold Since Acquisition Percentage ArsPortfolioRedeemedOrSoldSinceAcquisitionPercentage	0.94
CY2013	cma	Average Balance During Period Deposits AverageBalanceDuringPeriodDeposits	51711000000	USD
CY2014	cma	Average Balance During Period Deposits AverageBalanceDuringPeriodDeposits	54784000000	USD
CY2015	cma	Average Balance During Period Deposits AverageBalanceDuringPeriodDeposits	58326000000	USD
CY2013	cma	Average Balance During Period Loans And Leases Receivable Net Of Deferred Income AverageBalanceDuringPeriodLoansAndLeasesReceivableNetOfDeferredIncome	44412000000	USD
CY2014	cma	Average Balance During Period Loans And Leases Receivable Net Of Deferred Income AverageBalanceDuringPeriodLoansAndLeasesReceivableNetOfDeferredIncome	46588000000	USD
CY2015	cma	Average Balance During Period Loans And Leases Receivable Net Of Deferred Income AverageBalanceDuringPeriodLoansAndLeasesReceivableNetOfDeferredIncome	48628000000	USD
CY2014	cma	Average Reserve Requirement AverageReserveRequirement	430000000	USD
CY2015	cma	Average Reserve Requirement AverageReserveRequirement	473000000	USD
CY2014Q4	cma	Carrying Value Of Standby And Commercial Letters Of Credit CarryingValueOfStandbyAndCommercialLettersOfCredit	55000000	USD
CY2015Q4	cma	Carrying Value Of Standby And Commercial Letters Of Credit CarryingValueOfStandbyAndCommercialLettersOfCredit	49000000	USD
CY2014Q4	cma	Carrying Value Of Standby And Commercial Letters Of Credit Included In Allowance For Credit Losses On Lending Related Commitments CarryingValueOfStandbyAndCommercialLettersOfCreditIncludedInAllowanceForCreditLossesOnLendingRelatedCommitments	11000000	USD
CY2015Q4	cma	Carrying Value Of Standby And Commercial Letters Of Credit Included In Allowance For Credit Losses On Lending Related Commitments CarryingValueOfStandbyAndCommercialLettersOfCreditIncludedInAllowanceForCreditLossesOnLendingRelatedCommitments	12000000	USD
CY2014Q4	cma	Carrying Value Of Standby And Commercial Letters Of Credit Included In Deferred Fees CarryingValueOfStandbyAndCommercialLettersOfCreditIncludedInDeferredFees	44000000	USD
CY2015Q4	cma	Carrying Value Of Standby And Commercial Letters Of Credit Included In Deferred Fees CarryingValueOfStandbyAndCommercialLettersOfCreditIncludedInDeferredFees	37000000	USD
CY2014Q4	cma	Carrying Value Of Unused Commitments To Extend Credit CarryingValueOfUnusedCommitmentsToExtendCredit	30000000	USD
CY2015Q4	cma	Carrying Value Of Unused Commitments To Extend Credit CarryingValueOfUnusedCommitmentsToExtendCredit	33000000	USD
CY2015Q4	cma	Cash Collateral Posted For Derivatives In Liability Position CashCollateralPostedForDerivativesInLiabilityPosition	3000000	USD
CY2013	cma	Cash Dividends Paid To Parent Company By Bank Subsidiaries CashDividendsPaidToParentCompanyByBankSubsidiaries	480000000	USD
CY2014	cma	Cash Dividends Paid To Parent Company By Bank Subsidiaries CashDividendsPaidToParentCompanyByBankSubsidiaries	380000000	USD
CY2015	cma	Cash Dividends Paid To Parent Company By Bank Subsidiaries CashDividendsPaidToParentCompanyByBankSubsidiaries	437000000	USD
CY2013	cma	Commercial Lending Fees CommercialLendingFees	99000000	USD
CY2014	cma	Commercial Lending Fees CommercialLendingFees	98000000	USD
CY2015	cma	Commercial Lending Fees CommercialLendingFees	99000000	USD
CY2014Q4	cma	Deferred Tax Assets Deferred Loan Orgination Fees And Costs DeferredTaxAssetsDeferredLoanOrginationFeesAndCosts	28000000	USD
CY2015Q4	cma	Deferred Tax Assets Deferred Loan Orgination Fees And Costs DeferredTaxAssetsDeferredLoanOrginationFeesAndCosts	24000000	USD
CY2014Q4	cma	Deferred Tax Assets Loan Purchase Accounting Adjustments DeferredTaxAssetsLoanPurchaseAccountingAdjustments	5000000	USD
CY2015Q4	cma	Deferred Tax Assets Loan Purchase Accounting Adjustments DeferredTaxAssetsLoanPurchaseAccountingAdjustments	2000000	USD
CY2014Q4	cma	Deferred Tax Liabilities Tax Deferred Income Compensationand Benefits Pensions DeferredTaxLiabilitiesTaxDeferredIncomeCompensationandBenefitsPensions	38000000	USD
CY2015Q4	cma	Deferred Tax Liabilities Tax Deferred Income Compensationand Benefits Pensions DeferredTaxLiabilitiesTaxDeferredIncomeCompensationandBenefitsPensions	32000000	USD
CY2014Q4	cma	Deferred Tax Liabilities Unrealized Gains On Held For Sale Securities DeferredTaxLiabilitiesUnrealizedGainsOnHeldForSaleSecurities	21000000	USD
CY2015Q4	cma	Deferred Tax Liabilities Unrealized Gains On Held For Sale Securities DeferredTaxLiabilitiesUnrealizedGainsOnHeldForSaleSecurities	5000000	USD
CY2015	cma	Defined Benefit Plan Actuarial Gain Loss Amortization Adjustment Allowable Percentage DefinedBenefitPlanActuarialGainLossAmortizationAdjustmentAllowablePercentage	0.10
CY2015	cma	Defined Benefit Plan Investment Gain Loss Amortization Adjustment Allowable Percentage DefinedBenefitPlanInvestmentGainLossAmortizationAdjustmentAllowablePercentage	0.10
CY2015	cma	Defined Benefit Plan Market Related Value Plan Assets Amortization Period DefinedBenefitPlanMarketRelatedValuePlanAssetsAmortizationPeriod	P5Y
CY2015	cma	Defined Contribution Plan Total Qualified Earnings Matching Cash Contributions By Employer Percent DefinedContributionPlanTotalQualifiedEarningsMatchingCashContributionsByEmployerPercent	1.00
CY2015	cma	Delinquency Status Unpaid Scheduled Monthly Payment DelinquencyStatusUnpaidScheduledMonthlyPayment	P30D
CY2014Q4	cma	Deposits Customer Certificates Deposits DepositsCustomerCertificatesDeposits	4421000000	USD
CY2015Q4	cma	Deposits Customer Certificates Deposits DepositsCustomerCertificatesDeposits	3552000000	USD
CY2015Q4	cma	Derivative Assets Cash Collateral DerivativeAssetsCashCollateral	354000000	USD
CY2014Q4	cma	Domestic Time Deposits250000or More DomesticTimeDeposits250000orMore	2000000000	USD
CY2015Q4	cma	Domestic Time Deposits250000or More DomesticTimeDeposits250000orMore	1400000000	USD
CY2013	cma	Effective Income Tax Rate Reconciliation Interest On Income Tax Liabilities EffectiveIncomeTaxRateReconciliationInterestOnIncomeTaxLiabilities	-0.001
CY2014	cma	Effective Income Tax Rate Reconciliation Interest On Income Tax Liabilities EffectiveIncomeTaxRateReconciliationInterestOnIncomeTaxLiabilities	-0.003
CY2015	cma	Effective Income Tax Rate Reconciliation Interest On Income Tax Liabilities EffectiveIncomeTaxRateReconciliationInterestOnIncomeTaxLiabilities	0.001
CY2013	cma	Effective Income Tax Rate Reconciliation Lease Termination Transactions Amount EffectiveIncomeTaxRateReconciliationLeaseTerminationTransactionsAmount	0	USD
CY2014	cma	Effective Income Tax Rate Reconciliation Lease Termination Transactions Amount EffectiveIncomeTaxRateReconciliationLeaseTerminationTransactionsAmount	0	USD
CY2015	cma	Effective Income Tax Rate Reconciliation Lease Termination Transactions Amount EffectiveIncomeTaxRateReconciliationLeaseTerminationTransactionsAmount	-5000000	USD
CY2013	cma	Effective Income Tax Rate Reconciliation Lease Termination Transactions Percent EffectiveIncomeTaxRateReconciliationLeaseTerminationTransactionsPercent	0.000
CY2014	cma	Effective Income Tax Rate Reconciliation Lease Termination Transactions Percent EffectiveIncomeTaxRateReconciliationLeaseTerminationTransactionsPercent	0.000
CY2015	cma	Effective Income Tax Rate Reconciliation Lease Termination Transactions Percent EffectiveIncomeTaxRateReconciliationLeaseTerminationTransactionsPercent	-0.007
CY2013	cma	Efficiency Ratio EfficiencyRatio	0.6732
CY2014	cma	Efficiency Ratio EfficiencyRatio	0.6431
CY2015	cma	Efficiency Ratio EfficiencyRatio	0.6710
CY2015Q4	cma	Equity Method Investment Minimum Ownership Percentage To Qualify EquityMethodInvestmentMinimumOwnershipPercentageToQualify	0.20
CY2013	cma	Income Loss From Continuing Operations Before Income Taxes IncomeLossFromContinuingOperationsBeforeIncomeTaxes	786000000	USD
CY2014	cma	Income Loss From Continuing Operations Before Income Taxes IncomeLossFromContinuingOperationsBeforeIncomeTaxes	870000000	USD
CY2015	cma	Income Loss From Continuing Operations Before Income Taxes IncomeLossFromContinuingOperationsBeforeIncomeTaxes	750000000	USD
CY2013	cma	Income Tax Reconciliation Interest On Income Tax Liabilities IncomeTaxReconciliationInterestOnIncomeTaxLiabilities	-1000000	USD
CY2014	cma	Income Tax Reconciliation Interest On Income Tax Liabilities IncomeTaxReconciliationInterestOnIncomeTaxLiabilities	-3000000	USD
CY2015	cma	Income Tax Reconciliation Interest On Income Tax Liabilities IncomeTaxReconciliationInterestOnIncomeTaxLiabilities	1000000	USD
CY2013	cma	Interest And Dividend Income Securities Afs And Htm InterestAndDividendIncomeSecuritiesAFSAndHTM	214000000	USD
CY2014	cma	Interest And Dividend Income Securities Afs And Htm InterestAndDividendIncomeSecuritiesAFSAndHTM	211000000	USD
CY2015	cma	Interest And Dividend Income Securities Afs And Htm InterestAndDividendIncomeSecuritiesAFSAndHTM	216000000	USD
CY2013	cma	Lease Residual Transferred To Other Assets LeaseResidualTransferredToOtherAssets	0	USD
CY2014	cma	Lease Residual Transferred To Other Assets LeaseResidualTransferredToOtherAssets	0	USD
CY2015	cma	Lease Residual Transferred To Other Assets LeaseResidualTransferredToOtherAssets	16000000	USD
CY2014Q4	cma	Leases Receivable Commercial Lease Financing Net Of Deferred Income LeasesReceivableCommercialLeaseFinancingNetOfDeferredIncome	805000000	USD
CY2015Q4	cma	Leases Receivable Commercial Lease Financing Net Of Deferred Income LeasesReceivableCommercialLeaseFinancingNetOfDeferredIncome	724000000	USD
CY2013	cma	Letter Of Credit Fees LetterOfCreditFees	64000000	USD
CY2014	cma	Letter Of Credit Fees LetterOfCreditFees	57000000	USD
CY2015	cma	Letter Of Credit Fees LetterOfCreditFees	53000000	USD
CY2015Q4	cma	Liabilities Secured By Pledged Securities LiabilitiesSecuredByPledgedSecurities	1200000000	USD
CY2014Q4	cma	Loans And Leases Receivable Consumer Loans Net Of Deferred Income LoansAndLeasesReceivableConsumerLoansNetOfDeferredIncome	2382000000	USD
CY2015Q4	cma	Loans And Leases Receivable Consumer Loans Net Of Deferred Income LoansAndLeasesReceivableConsumerLoansNetOfDeferredIncome	2485000000	USD
CY2014Q4	cma	Loans And Leases Receivable Consumer Mortgage Net Of Deferred Income LoansAndLeasesReceivableConsumerMortgageNetOfDeferredIncome	1831000000	USD
CY2015Q4	cma	Loans And Leases Receivable Consumer Mortgage Net Of Deferred Income LoansAndLeasesReceivableConsumerMortgageNetOfDeferredIncome	1870000000	USD
CY2014Q4	cma	Loans And Leases Receivable Foreign Net Of Deferred Income Other LoansAndLeasesReceivableForeignNetOfDeferredIncomeOther	1496000000	USD
CY2015Q4	cma	Loans And Leases Receivable Foreign Net Of Deferred Income Other LoansAndLeasesReceivableForeignNetOfDeferredIncomeOther	1368000000	USD
CY2014Q4	cma	Loans Receivable Commercial Financial And Agricultural Net Of Deferred Income LoansReceivableCommercialFinancialAndAgriculturalNetOfDeferredIncome	31520000000	USD
CY2015Q4	cma	Loans Receivable Commercial Financial And Agricultural Net Of Deferred Income LoansReceivableCommercialFinancialAndAgriculturalNetOfDeferredIncome	31659000000	USD
CY2014Q4	cma	Loans Receivable Commercial Mortgage Net Of Deferred Income LoansReceivableCommercialMortgageNetOfDeferredIncome	8604000000	USD
CY2015Q4	cma	Loans Receivable Commercial Mortgage Net Of Deferred Income LoansReceivableCommercialMortgageNetOfDeferredIncome	8977000000	USD
CY2015	cma	Longest Expiration Year Letters Of Credit LongestExpirationYearLettersOfCredit	2022
CY2013	cma	Net Credit Related Charge Offs NetCreditRelatedChargeOffs	73000000	USD
CY2014	cma	Net Credit Related Charge Offs NetCreditRelatedChargeOffs	25000000	USD
CY2015	cma	Net Credit Related Charge Offs NetCreditRelatedChargeOffs	100000000	USD
CY2013	cma	Net Increase In Fixed Assets NetIncreaseInFixedAssets	102000000	USD
CY2014	cma	Net Increase In Fixed Assets NetIncreaseInFixedAssets	70000000	USD
CY2015	cma	Net Increase In Fixed Assets NetIncreaseInFixedAssets	119000000	USD
CY2014Q1	cma	Non Interest Income Excluding Net Securities Gains NonInterestIncomeExcludingNetSecuritiesGains	207000000	USD
CY2014Q2	cma	Non Interest Income Excluding Net Securities Gains NonInterestIncomeExcludingNetSecuritiesGains	220000000	USD
CY2014Q3	cma	Non Interest Income Excluding Net Securities Gains NonInterestIncomeExcludingNetSecuritiesGains	216000000	USD
CY2014Q4	cma	Non Interest Income Excluding Net Securities Gains NonInterestIncomeExcludingNetSecuritiesGains	225000000	USD
CY2015Q1	cma	Non Interest Income Excluding Net Securities Gains NonInterestIncomeExcludingNetSecuritiesGains	257000000	USD
CY2015Q2	cma	Non Interest Income Excluding Net Securities Gains NonInterestIncomeExcludingNetSecuritiesGains	261000000	USD
CY2015Q3	cma	Non Interest Income Excluding Net Securities Gains NonInterestIncomeExcludingNetSecuritiesGains	264000000	USD
CY2015Q4	cma	Non Interest Income Excluding Net Securities Gains NonInterestIncomeExcludingNetSecuritiesGains	270000000	USD
CY2015	cma	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Amortization Of Unrealized Losses On Afs Securities Transferred To Htm Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForAmortizationOfUnrealizedLossesOnAFSSecuritiesTransferredToHTMBeforeTax	-8000000	USD
CY2013	cma	Other Comprehensive Income Loss Reclassification Adjustment Pension And Other Postretirement Benefit Plans Recognized In Net Periodic Defined Benefit Cost Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentPensionAndOtherPostretirementBenefitPlansRecognizedInNetPeriodicDefinedBenefitCostBeforeTax	91000000	USD
CY2014	cma	Other Comprehensive Income Loss Reclassification Adjustment Pension And Other Postretirement Benefit Plans Recognized In Net Periodic Defined Benefit Cost Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentPensionAndOtherPostretirementBenefitPlansRecognizedInNetPeriodicDefinedBenefitCostBeforeTax	42000000	USD
CY2014Q4	cma	Notional Amount Of Derivative Credit Risk Participation Agreements NotionalAmountOfDerivativeCreditRiskParticipationAgreements	598000000	USD
CY2015Q4	cma	Notional Amount Of Derivative Credit Risk Participation Agreements NotionalAmountOfDerivativeCreditRiskParticipationAgreements	559000000	USD
CY2015	cma	Number Of Geographic Markets NumberOfGeographicMarkets	3	markets
CY2015	cma	Number Of Major Business Segments NumberOfMajorBusinessSegments	3	segments
CY2013	cma	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Amortization Of Unrealized Losses On Afs Securities Transferred To Htm Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForAmortizationOfUnrealizedLossesOnAFSSecuritiesTransferredToHTMBeforeTax	0	USD
CY2014	cma	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Amortization Of Unrealized Losses On Afs Securities Transferred To Htm Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForAmortizationOfUnrealizedLossesOnAFSSecuritiesTransferredToHTMBeforeTax	0	USD
CY2015	cma	Other Comprehensive Income Loss Reclassification Adjustment Pension And Other Postretirement Benefit Plans Recognized In Net Periodic Defined Benefit Cost Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentPensionAndOtherPostretirementBenefitPlansRecognizedInNetPeriodicDefinedBenefitCostBeforeTax	71000000	USD
CY2013	cma	Other Comprehensive Income Loss Reclassification Adjustment Pension And Other Postretirement Benefit Plans Recognized In Net Periodic Defined Benefit Cost Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentPensionAndOtherPostretirementBenefitPlansRecognizedInNetPeriodicDefinedBenefitCostNetOfTax	57000000	USD
CY2014	cma	Other Comprehensive Income Loss Reclassification Adjustment Pension And Other Postretirement Benefit Plans Recognized In Net Periodic Defined Benefit Cost Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentPensionAndOtherPostretirementBenefitPlansRecognizedInNetPeriodicDefinedBenefitCostNetOfTax	27000000	USD
CY2015	cma	Other Comprehensive Income Loss Reclassification Adjustment Pension And Other Postretirement Benefit Plans Recognized In Net Periodic Defined Benefit Cost Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentPensionAndOtherPostretirementBenefitPlansRecognizedInNetPeriodicDefinedBenefitCostNetOfTax	46000000	USD
CY2013	cma	Other Comprehensive Income Loss Reclassification Adjustment Pension And Other Postretirement Benefit Plans Recognized In Net Periodic Defined Benefit Cost Tax OtherComprehensiveIncomeLossReclassificationAdjustmentPensionAndOtherPostretirementBenefitPlansRecognizedInNetPeriodicDefinedBenefitCostTax	34000000	USD
CY2014	cma	Other Comprehensive Income Loss Reclassification Adjustment Pension And Other Postretirement Benefit Plans Recognized In Net Periodic Defined Benefit Cost Tax OtherComprehensiveIncomeLossReclassificationAdjustmentPensionAndOtherPostretirementBenefitPlansRecognizedInNetPeriodicDefinedBenefitCostTax	15000000	USD
CY2015	cma	Other Comprehensive Income Loss Reclassification Adjustment Pension And Other Postretirement Benefit Plans Recognized In Net Periodic Defined Benefit Cost Tax OtherComprehensiveIncomeLossReclassificationAdjustmentPensionAndOtherPostretirementBenefitPlansRecognizedInNetPeriodicDefinedBenefitCostTax	25000000	USD
CY2013	cma	Other Comprehensive Income Loss Reclassification From Aoci For Amortization Of Yield Adjustment Tax OtherComprehensiveIncomeLossReclassificationFromAOCIForAmortizationOfYieldAdjustmentTax	0	USD
CY2014	cma	Other Comprehensive Income Loss Reclassification From Aoci For Amortization Of Yield Adjustment Tax OtherComprehensiveIncomeLossReclassificationFromAOCIForAmortizationOfYieldAdjustmentTax	0	USD
CY2015	cma	Other Comprehensive Income Loss Reclassification From Aoci For Amortization Of Yield Adjustment Tax OtherComprehensiveIncomeLossReclassificationFromAOCIForAmortizationOfYieldAdjustmentTax	-3000000	USD
CY2013	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	0	USD
CY2014	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	0	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
CY2013	cma	Outside Processing Fee Expense OutsideProcessingFeeExpense	119000000	USD
CY2014	cma	Outside Processing Fee Expense OutsideProcessingFeeExpense	122000000	USD
CY2015	cma	Outside Processing Fee Expense OutsideProcessingFeeExpense	332000000	USD
CY2013	cma	Profit Sharing Plan Costs Recognized ProfitSharingPlanCostsRecognized	7000000	USD
CY2014	cma	Profit Sharing Plan Costs Recognized ProfitSharingPlanCostsRecognized	10000000	USD
CY2015	cma	Profit Sharing Plan Costs Recognized ProfitSharingPlanCostsRecognized	10000000	USD
CY2014Q4	cma	Real Estate Construction Loans Net Of Deferred Income RealEstateConstructionLoansNetOfDeferredIncome	1955000000	USD
CY2015Q4	cma	Real Estate Construction Loans Net Of Deferred Income RealEstateConstructionLoansNetOfDeferredIncome	2001000000	USD
CY2014Q4	cma	Reduced Rate Loans ReducedRateLoans	17000000	USD
CY2015Q4	cma	Reduced Rate Loans ReducedRateLoans	12000000	USD
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CY2014	cma	Return On Average Assets ReturnOnAverageAssets	0.0089
CY2015	cma	Return On Average Assets ReturnOnAverageAssets	0.0074
CY2014Q4	cma	Risk Participations Covering Standby And Commercial Letters Of Credit RiskParticipationsCoveringStandbyAndCommercialLettersOfCredit	316000000	USD
CY2015Q4	cma	Risk Participations Covering Standby And Commercial Letters Of Credit RiskParticipationsCoveringStandbyAndCommercialLettersOfCredit	287000000	USD
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CY2014	cma	Segment Reporting Average Assets SegmentReportingAverageAssets	66336000000	USD
CY2015	cma	Segment Reporting Average Assets SegmentReportingAverageAssets	70247000000	USD
CY2013	cma	Segment Reporting Information Interest Income Expense Net Fte SegmentReportingInformationInterestIncomeExpenseNetFte	1675000000	USD
CY2014	cma	Segment Reporting Information Interest Income Expense Net Fte SegmentReportingInformationInterestIncomeExpenseNetFte	1659000000	USD
CY2015	cma	Segment Reporting Information Interest Income Expense Net Fte SegmentReportingInformationInterestIncomeExpenseNetFte	1693000000	USD
CY2013	cma	Segment Reporting Information Tax Expense Fte SegmentReportingInformationTaxExpenseFte	248000000	USD
CY2014	cma	Segment Reporting Information Tax Expense Fte SegmentReportingInformationTaxExpenseFte	281000000	USD
CY2015	cma	Segment Reporting Information Tax Expense Fte SegmentReportingInformationTaxExpenseFte	233000000	USD
CY2015	cma	Share Repurchases Authorized In Capital Plan ShareRepurchasesAuthorizedInCapitalPlan	393000000	USD
CY2015Q4	cma	Share Repurchases Repurchasedper Capital Plan ShareRepurchasesRepurchasedperCapitalPlan	242000000	USD
CY2013	cma	Software Expenses SoftwareExpenses	90000000	USD
CY2014	cma	Software Expenses SoftwareExpenses	95000000	USD
CY2015	cma	Software Expenses SoftwareExpenses	99000000	USD
CY2015	cma	Stock Issued During Period Value Warrants Exercised StockIssuedDuringPeriodValueWarrantsExercised	0	USD
CY2014Q4	cma	Total Automotive Exposure TotalAutomotiveExposure	10171000000	USD
CY2015Q4	cma	Total Automotive Exposure TotalAutomotiveExposure	10661000000	USD
CY2014Q4	cma	Total Automotive Loans TotalAutomotiveLoans	7667000000	USD
CY2015Q4	cma	Total Automotive Loans TotalAutomotiveLoans	7839000000	USD
CY2014Q4	cma	Total Internally Classified Watch List Letters Of Credit TotalInternallyClassifiedWatchListLettersOfCredit	79000000	USD
CY2015Q4	cma	Total Internally Classified Watch List Letters Of Credit TotalInternallyClassifiedWatchListLettersOfCredit	110000000	USD
CY2014Q4	cma	Total Nonperforming Assets TotalNonperformingAssets	300000000	USD
CY2015Q4	cma	Total Nonperforming Assets TotalNonperformingAssets	391000000	USD
CY2014Q4	cma	Total Nonperforming Loans TotalNonperformingLoans	290000000	USD
CY2015Q4	cma	Total Nonperforming Loans TotalNonperformingLoans	379000000	USD
CY2013	cma	Transfer Of Available For Sale Securities To Held To Maturity Securities TransferOfAvailableForSaleSecuritiesToHeldToMaturitySecurities	0	USD
CY2014	cma	Transfer Of Available For Sale Securities To Held To Maturity Securities TransferOfAvailableForSaleSecuritiesToHeldToMaturitySecurities	1958000000	USD
CY2015	cma	Transfer Of Available For Sale Securities To Held To Maturity Securities TransferOfAvailableForSaleSecuritiesToHeldToMaturitySecurities	0	USD
CY2014	cma	Unrealized Losseson Availableforsale Securities Transferredto Heldtomaturity UnrealizedLossesonAvailableforsaleSecuritiesTransferredtoHeldtomaturity	23000000	USD
CY2015	cma	Unrealized Losseson Availableforsale Securities Transferredto Heldtomaturity UnrealizedLossesonAvailableforsaleSecuritiesTransferredtoHeldtomaturity	15000000	USD
CY2014Q4	cma	Watch List Letters Of Credit As Percentage Of Total Letters Of Credit WatchListLettersOfCreditAsPercentageOfTotalLettersOfCredit	0.020
CY2015Q4	cma	Watch List Letters Of Credit As Percentage Of Total Letters Of Credit WatchListLettersOfCreditAsPercentageOfTotalLettersOfCredit	0.027
CY2015	dei	Amendment Flag AmendmentFlag	false
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CY2015	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	FY
CY2015	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2015
CY2015	dei	Document Period End Date DocumentPeriodEndDate	2015-12-31
CY2015	dei	Document Type DocumentType	10-K
CY2015	dei	Entity Central Index Key EntityCentralIndexKey	0000028412
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CY2015	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
CY2015	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
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CY2015	dei	Entity Registrant Name EntityRegistrantName	Comerica INC /NEW/
CY2015	dei	Entity Voluntary Filers EntityVoluntaryFilers	No
CY2015	dei	Entity Well Known Seasoned Issuer EntityWellKnownSeasonedIssuer	Yes
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CY2015Q4	invest	Derivative Notional Amount DerivativeNotionalAmount	20764000000	USD
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CY2014Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	872000000	USD
CY2015Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	889000000	USD
CY2012Q4	us-gaap	Accumulated Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	150000000	USD
CY2013Q4	us-gaap	Accumulated Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	-68000000	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
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CY2014Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-412000000	USD
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CY2015Q4	us-gaap	Additional Collateral Aggregate Fair Value AdditionalCollateralAggregateFairValue	1000000	USD
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CY2015Q4	us-gaap	Additional Paid In Capital Common Stock AdditionalPaidInCapitalCommonStock	2173000000	USD
CY2013	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	35000000	USD
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CY2015	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	38000000	USD
CY2013	us-gaap	Advertising Expense AdvertisingExpense	21000000	USD
CY2014	us-gaap	Advertising Expense AdvertisingExpense	23000000	USD
CY2015	us-gaap	Advertising Expense AdvertisingExpense	24000000	USD
CY2013	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	35000000	USD
CY2014	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	38000000	USD
CY2015	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	38000000	USD
CY2014Q4	us-gaap	Assets Assets	69186000000	USD
CY2015Q4	us-gaap	Assets Assets	71877000000	USD
CY2015Q4	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	10292000000	USD
CY2014Q4	us-gaap	Available For Sale Securities AvailableForSaleSecurities	8116000000	USD
CY2015Q4	us-gaap	Available For Sale Securities AvailableForSaleSecurities	10519000000	USD
CY2014Q4	us-gaap	Available For Sale Securities Accumulated Gross Unrealized Gain Before Tax AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax	123000000	USD
CY2015Q4	us-gaap	Available For Sale Securities Accumulated Gross Unrealized Gain Before Tax AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax	79000000	USD
CY2014Q4	us-gaap	Available For Sale Securities Accumulated Gross Unrealized Loss Before Tax AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax	42000000	USD
CY2015Q4	us-gaap	Available For Sale Securities Accumulated Gross Unrealized Loss Before Tax AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax	51000000	USD
CY2014Q4	us-gaap	Available For Sale Securities Amortized Cost AvailableForSaleSecuritiesAmortizedCost	8035000000	USD
CY2015Q4	us-gaap	Available For Sale Securities Amortized Cost AvailableForSaleSecuritiesAmortizedCost	10491000000	USD
CY2014Q4	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position12 Months Or Longer Accumulated Loss AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss	73000000	USD
CY2015Q4	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position12 Months Or Longer Accumulated Loss AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss	51000000	USD
CY2014Q4	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Accumulated Loss AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLoss	76000000	USD
CY2015Q4	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Accumulated Loss AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLoss	79000000	USD
CY2014Q4	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Fair Value AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue	4171000000	USD
CY2015Q4	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Fair Value AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue	6930000000	USD
CY2014Q4	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Less Than12 Months Accumulated Loss AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss	3000000	USD
CY2015Q4	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Less Than12 Months Accumulated Loss AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss	28000000	USD
CY2014Q4	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Less Than Twelve Months Fair Value AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue	924000000	USD
CY2015Q4	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Less Than Twelve Months Fair Value AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue	4944000000	USD
CY2014Q4	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or Longer Fair Value AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue	3247000000	USD
CY2015Q4	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or Longer Fair Value AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue	1986000000	USD
CY2015Q4	us-gaap	Available For Sale Securities Debt Maturities After Five Through Ten Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost	1268000000	USD
CY2015Q4	us-gaap	Available For Sale Securities Debt Maturities After Five Through Ten Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue	1308000000	USD
CY2015Q4	us-gaap	Available For Sale Securities Debt Maturities After One Through Five Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost	2857000000	USD
CY2015Q4	us-gaap	Available For Sale Securities Debt Maturities After One Through Five Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue	2851000000	USD
CY2015Q4	us-gaap	Available For Sale Securities Debt Maturities After Ten Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost	6157000000	USD
CY2015Q4	us-gaap	Available For Sale Securities Debt Maturities After Ten Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue	6149000000	USD
CY2015Q4	us-gaap	Available For Sale Securities Debt Maturities Within One Year Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost	10000000	USD
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CY2015Q4	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	10318000000	USD
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CY2015	us-gaap	Available For Sale Securities Gross Realized Gains AvailableForSaleSecuritiesGrossRealizedGains	0	USD
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CY2015Q4	us-gaap	Available For Sale Securities Pledged As Collateral AvailableForSaleSecuritiesPledgedAsCollateral	2400000000	USD
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CY2013	us-gaap	Brokerage Commissions Revenue BrokerageCommissionsRevenue	17000000	USD
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CY2015	us-gaap	Brokerage Commissions Revenue BrokerageCommissionsRevenue	17000000	USD
CY2014Q4	us-gaap	Buildings And Improvements Gross BuildingsAndImprovementsGross	808000000	USD
CY2015Q4	us-gaap	Buildings And Improvements Gross BuildingsAndImprovementsGross	862000000	USD
CY2014Q4	us-gaap	Capital Required To Be Well Capitalized To Risk Weighted Assets CapitalRequiredToBeWellCapitalizedToRiskWeightedAssets	0.10
CY2015Q4	us-gaap	Capital Required To Be Well Capitalized To Risk Weighted Assets CapitalRequiredToBeWellCapitalizedToRiskWeightedAssets	0.10
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CY2013Q4	us-gaap	Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Allowance For Loan Losses CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAllowanceForLoanLosses	0	USD
CY2014Q4	us-gaap	Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Allowance For Loan Losses CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAllowanceForLoanLosses	0	USD
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CY2015	us-gaap	Change In Unrealized Gain Loss On Fair Value Hedging Instruments1 ChangeInUnrealizedGainLossOnFairValueHedgingInstruments1	70000000	USD
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CY2014Q4	us-gaap	Common Stock Value CommonStockValue	1141000000	USD
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CY2013	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	563000000	USD
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CY2015Q4	us-gaap	Debt Instrument Carrying Amount DebtInstrumentCarryingAmount	2941000000	USD
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CY2014Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	0	USD
CY2015Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	3000000	USD
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CY2015Q4	us-gaap	Deferred Tax Liabilities Leasing Arrangements DeferredTaxLiabilitiesLeasingArrangements	183000000	USD
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CY2015Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	7000000	USD
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CY2015	us-gaap	Defined Benefit Plan Effect Of One Percentage Point Increase On Service And Interest Cost Components DefinedBenefitPlanEffectOfOnePercentagePointIncreaseOnServiceAndInterestCostComponents	0	USD
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CY2015Q4	us-gaap	Defined Benefit Plan Fair Value Of Plan Assets DefinedBenefitPlanFairValueOfPlanAssets	2347000000	USD
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CY2015Q4	us-gaap	Derivative Asset Collateral Obligation To Return Cash Offset DerivativeAssetCollateralObligationToReturnCashOffset	291000000	USD
CY2014Q4	us-gaap	Derivative Asset Fair Value Gross Liability DerivativeAssetFairValueGrossLiability	133000000	USD
CY2015Q4	us-gaap	Derivative Asset Fair Value Gross Liability DerivativeAssetFairValueGrossLiability	127000000	USD
CY2015Q4	us-gaap	Derivative Asset Fair Value Of Collateral DerivativeAssetFairValueOfCollateral	139000000	USD
CY2014Q4	us-gaap	Derivative Assets DerivativeAssets	499000000	USD
CY2015Q4	us-gaap	Derivative Assets DerivativeAssets	400000000	USD
CY2014Q4	us-gaap	Derivative Collateral Obligation To Return Securities DerivativeCollateralObligationToReturnSecurities	239000000	USD
CY2015Q4	us-gaap	Derivative Collateral Obligation To Return Securities DerivativeCollateralObligationToReturnSecurities	137000000	USD
CY2014Q4	us-gaap	Derivative Collateral Right To Reclaim Securities DerivativeCollateralRightToReclaimSecurities	2000000	USD
CY2015Q4	us-gaap	Derivative Collateral Right To Reclaim Securities DerivativeCollateralRightToReclaimSecurities	3000000	USD
CY2014Q4	us-gaap	Derivative Credit Risk Valuation Adjustment Derivative Assets DerivativeCreditRiskValuationAdjustmentDerivativeAssets	2000000	USD
CY2015Q4	us-gaap	Derivative Credit Risk Valuation Adjustment Derivative Assets DerivativeCreditRiskValuationAdjustmentDerivativeAssets	5000000	USD
CY2014Q4	us-gaap	Derivative Fair Value Of Derivative Asset DerivativeFairValueOfDerivativeAsset	894000000	USD
CY2015Q4	us-gaap	Derivative Fair Value Of Derivative Asset DerivativeFairValueOfDerivativeAsset	818000000	USD
CY2014Q4	us-gaap	Derivative Fair Value Of Derivative Asset Amount Offset Against Collateral DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCollateral	260000000	USD
CY2015Q4	us-gaap	Derivative Fair Value Of Derivative Asset Amount Offset Against Collateral DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCollateral	263000000	USD
CY2014Q4	us-gaap	Derivative Fair Value Of Derivative Liability DerivativeFairValueOfDerivativeLiability	661000000	USD
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CY2014Q4	us-gaap	Derivative Fair Value Of Derivative Liability Amount Offset Against Collateral DerivativeFairValueOfDerivativeLiabilityAmountOffsetAgainstCollateral	526000000	USD
CY2015Q4	us-gaap	Derivative Fair Value Of Derivative Liability Amount Offset Against Collateral DerivativeFairValueOfDerivativeLiabilityAmountOffsetAgainstCollateral	477000000	USD
CY2014Q4	us-gaap	Derivative Liabilities DerivativeLiabilities	528000000	USD
CY2015Q4	us-gaap	Derivative Liabilities DerivativeLiabilities	480000000	USD
CY2014Q4	us-gaap	Derivative Liability Collateral Right To Reclaim Cash Offset DerivativeLiabilityCollateralRightToReclaimCashOffset	0	USD
CY2015Q4	us-gaap	Derivative Liability Collateral Right To Reclaim Cash Offset DerivativeLiabilityCollateralRightToReclaimCashOffset	3000000	USD
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CY2015Q4	us-gaap	Derivative Liability Fair Value Gross Asset DerivativeLiabilityFairValueGrossAsset	127000000	USD
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CY2015	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	148000000	USD
CY2013	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.92
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CY2014Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.85
CY2014Q4	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.83
CY2014	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	3.28
CY2015	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.93
CY2013	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.85
CY2015Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.75
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CY2015Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.76
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CY2014Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.82
CY2014Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.80
CY2014	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	3.16
CY2015Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.73
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CY2015	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.84
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CY2014	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	-0.001
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CY2013	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0.014
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CY2015	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0.013
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CY2014	us-gaap	Effective Income Tax Rate Reconciliation Tax Credits Other EffectiveIncomeTaxRateReconciliationTaxCreditsOther	0.028
CY2015	us-gaap	Effective Income Tax Rate Reconciliation Tax Credits Other EffectiveIncomeTaxRateReconciliationTaxCreditsOther	0.029
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CY2014	us-gaap	Effective Income Tax Rate Reconciliation Tax Exempt Income EffectiveIncomeTaxRateReconciliationTaxExemptIncome	0.017
CY2015	us-gaap	Effective Income Tax Rate Reconciliation Tax Exempt Income EffectiveIncomeTaxRateReconciliationTaxExemptIncome	0.020
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CY2013	us-gaap	Excess Tax Benefit From Share Based Compensation Financing Activities ExcessTaxBenefitFromShareBasedCompensationFinancingActivities	3000000	USD
CY2014	us-gaap	Excess Tax Benefit From Share Based Compensation Financing Activities ExcessTaxBenefitFromShareBasedCompensationFinancingActivities	7000000	USD
CY2015	us-gaap	Excess Tax Benefit From Share Based Compensation Financing Activities ExcessTaxBenefitFromShareBasedCompensationFinancingActivities	3000000	USD
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CY2015Q4	us-gaap	Fair Value Investments Entities That Calculate Net Asset Value Per Share Unfunded Committments FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerShareUnfundedCommittments	4000000	USD
CY2013	us-gaap	Federal Deposit Insurance Corporation Premium Expense FederalDepositInsuranceCorporationPremiumExpense	33000000	USD
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CY2015	us-gaap	Federal Deposit Insurance Corporation Premium Expense FederalDepositInsuranceCorporationPremiumExpense	37000000	USD
CY2015Q4	us-gaap	Federal Home Loan Bank Advances General Debt Obligations Disclosures Amount Of Available Unused Funds FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresAmountOfAvailableUnusedFunds	6000000000	USD
CY2014Q4	us-gaap	Federal Home Loan Bank Stock FederalHomeLoanBankStock	7000000	USD
CY2015Q4	us-gaap	Federal Home Loan Bank Stock FederalHomeLoanBankStock	7000000	USD
CY2014Q4	us-gaap	Federal Reserve Bank Stock FederalReserveBankStock	85000000	USD
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CY2015	us-gaap	Fees And Commissions Fiduciary And Trust Activities FeesAndCommissionsFiduciaryAndTrustActivities	187000000	USD
CY2013Q1	us-gaap	Financing Receivable Allowance For Credit Losses Effect Of Change In Method FinancingReceivableAllowanceForCreditLossesEffectOfChangeInMethod	40000000	USD
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CY2014Q4	us-gaap	Financing Receivable Recorded Investment Current FinancingReceivableRecordedInvestmentCurrent	48152000000	USD
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CY2014Q4	us-gaap	Financing Receivable Recorded Investment Past Due FinancingReceivableRecordedInvestmentPastDue	168000000	USD
CY2015Q4	us-gaap	Financing Receivable Recorded Investment Past Due FinancingReceivableRecordedInvestmentPastDue	146000000	USD
CY2014Q4	us-gaap	Foreclosed Assets ForeclosedAssets	10000000	USD
CY2015Q4	us-gaap	Foreclosed Assets ForeclosedAssets	12000000	USD
CY2013	us-gaap	Foreign Currency Transaction Gain Loss Before Tax ForeignCurrencyTransactionGainLossBeforeTax	36000000	USD
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CY2014Q4	us-gaap	Furniture And Fixtures Gross FurnitureAndFixturesGross	508000000	USD
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CY2014	us-gaap	Gain Loss On Foreign Currency Derivative Instruments Not Designated As Hedging Instruments GainLossOnForeignCurrencyDerivativeInstrumentsNotDesignatedAsHedgingInstruments	1000000	USD
CY2015	us-gaap	Gain Loss On Foreign Currency Derivative Instruments Not Designated As Hedging Instruments GainLossOnForeignCurrencyDerivativeInstrumentsNotDesignatedAsHedgingInstruments	1000000	USD
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CY2014	us-gaap	Gain Loss On Sale Of Securities Net GainLossOnSaleOfSecuritiesNet	0	USD
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CY2015Q3	us-gaap	Gain Loss On Sale Of Securities Net GainLossOnSaleOfSecuritiesNet	0	USD
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CY2015	us-gaap	Gain Loss On Sale Of Securities Net GainLossOnSaleOfSecuritiesNet	-2000000	USD
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CY2015	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	0	USD
CY2013Q4	us-gaap	Goodwill Goodwill	635000000	USD
CY2014Q4	us-gaap	Goodwill Goodwill	635000000	USD
CY2015Q4	us-gaap	Goodwill Goodwill	635000000	USD
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CY2014Q4	us-gaap	Impaired Financing Receivable With No Related Allowance Recorded Investment ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment	53000000	USD
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CY2014Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	73000000	USD
CY2014Q4	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	70000000	USD
CY2014	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	277000000	USD
CY2015Q1	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	61000000	USD
CY2015Q2	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	64000000	USD
CY2015Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	63000000	USD
CY2015Q4	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	41000000	USD
CY2015	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	229000000	USD
CY2013	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	275000000	USD
CY2014	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	305000000	USD
CY2015	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	262000000	USD
CY2013	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	-2000000	USD
CY2014	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	-1000000	USD
CY2015	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	-2000000	USD
CY2013	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	11000000	USD
CY2014	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	13000000	USD
CY2015	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	10000000	USD
CY2013	us-gaap	Income Tax Reconciliation Tax Contingencies Other IncomeTaxReconciliationTaxContingenciesOther	-2000000	USD
CY2014	us-gaap	Income Tax Reconciliation Tax Contingencies Other IncomeTaxReconciliationTaxContingenciesOther	2000000	USD
CY2015	us-gaap	Income Tax Reconciliation Tax Contingencies Other IncomeTaxReconciliationTaxContingenciesOther	0	USD
CY2013	us-gaap	Income Tax Reconciliation Tax Credits Other IncomeTaxReconciliationTaxCreditsOther	21000000	USD
CY2014	us-gaap	Income Tax Reconciliation Tax Credits Other IncomeTaxReconciliationTaxCreditsOther	24000000	USD
CY2015	us-gaap	Income Tax Reconciliation Tax Credits Other IncomeTaxReconciliationTaxCreditsOther	22000000	USD
CY2013	us-gaap	Income Tax Reconciliation Tax Exempt Income IncomeTaxReconciliationTaxExemptIncome	15000000	USD
CY2014	us-gaap	Income Tax Reconciliation Tax Exempt Income IncomeTaxReconciliationTaxExemptIncome	15000000	USD
CY2015	us-gaap	Income Tax Reconciliation Tax Exempt Income IncomeTaxReconciliationTaxExemptIncome	15000000	USD
CY2013	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	115000000	USD
CY2014	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	218000000	USD
CY2015	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	88000000	USD
CY2013	us-gaap	Increase Decrease In Accrued Liabilities IncreaseDecreaseInAccruedLiabilities	38000000	USD
CY2014	us-gaap	Increase Decrease In Accrued Liabilities IncreaseDecreaseInAccruedLiabilities	-14000000	USD
CY2015	us-gaap	Increase Decrease In Accrued Liabilities IncreaseDecreaseInAccruedLiabilities	-35000000	USD
CY2013	us-gaap	Increase Decrease In Deposits IncreaseDecreaseInDeposits	1229000000	USD
CY2014	us-gaap	Increase Decrease In Deposits IncreaseDecreaseInDeposits	4013000000	USD
CY2015	us-gaap	Increase Decrease In Deposits IncreaseDecreaseInDeposits	2529000000	USD
CY2013	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	-7000000	USD
CY2014	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	4000000	USD
CY2015	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	12000000	USD
CY2013	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	2000000	USD
CY2014	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	243000000	USD
CY2015	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	-105000000	USD
CY2013	us-gaap	Increase Decrease In Trading Securities IncreaseDecreaseInTradingSecurities	-6000000	USD
CY2014	us-gaap	Increase Decrease In Trading Securities IncreaseDecreaseInTradingSecurities	-13000000	USD
CY2015	us-gaap	Increase Decrease In Trading Securities IncreaseDecreaseInTradingSecurities	0	USD
CY2013	us-gaap	Incremental Common Shares Attributable To Call Options And Warrants IncrementalCommonSharesAttributableToCallOptionsAndWarrants	3000000	shares
CY2014	us-gaap	Incremental Common Shares Attributable To Call Options And Warrants IncrementalCommonSharesAttributableToCallOptionsAndWarrants	4000000	shares
CY2015	us-gaap	Incremental Common Shares Attributable To Call Options And Warrants IncrementalCommonSharesAttributableToCallOptionsAndWarrants	3000000	shares
CY2013	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	1000000	shares
CY2014	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	2000000	shares
CY2015	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	2000000	shares
CY2014	us-gaap	Ineffectiveness On Interest Rate Fair Value Hedges Is Immaterial IneffectivenessOnInterestRateFairValueHedgesIsImmaterial	an insignificant amount
CY2013	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	1784000000	USD
CY2014Q1	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	435000000	USD
CY2014Q2	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	441000000	USD
CY2014Q3	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	436000000	USD
CY2014Q4	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	438000000	USD
CY2014	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	1750000000	USD
CY2015Q1	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	435000000	USD
CY2015Q2	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	444000000	USD
CY2015Q3	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	448000000	USD
CY2015Q4	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	457000000	USD
CY2015	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	1784000000	USD
CY2013	us-gaap	Interest And Fee Income Loans And Leases Held In Portfolio InterestAndFeeIncomeLoansAndLeasesHeldInPortfolio	1556000000	USD
CY2014	us-gaap	Interest And Fee Income Loans And Leases Held In Portfolio InterestAndFeeIncomeLoansAndLeasesHeldInPortfolio	1525000000	USD
CY2015	us-gaap	Interest And Fee Income Loans And Leases Held In Portfolio InterestAndFeeIncomeLoansAndLeasesHeldInPortfolio	1551000000	USD
CY2014Q4	us-gaap	Interest Bearing Deposit Liabilities InterestBearingDepositLiabilities	30262000000	USD
CY2015Q4	us-gaap	Interest Bearing Deposit Liabilities InterestBearingDepositLiabilities	29014000000	USD
CY2014Q4	us-gaap	Interest Bearing Deposits In Banks InterestBearingDepositsInBanks	5045000000	USD
CY2015Q4	us-gaap	Interest Bearing Deposits In Banks InterestBearingDepositsInBanks	4990000000	USD
CY2014Q4	us-gaap	Interest Bearing Foreign Deposit Time Deposits InterestBearingForeignDepositTimeDeposits	135000000	USD
CY2015Q4	us-gaap	Interest Bearing Foreign Deposit Time Deposits InterestBearingForeignDepositTimeDeposits	32000000	USD
CY2013	us-gaap	Interest Expense InterestExpense	112000000	USD
CY2014Q1	us-gaap	Interest Expense InterestExpense	25000000	USD
CY2014Q2	us-gaap	Interest Expense InterestExpense	25000000	USD
CY2014Q3	us-gaap	Interest Expense InterestExpense	22000000	USD
CY2014Q4	us-gaap	Interest Expense InterestExpense	23000000	USD
CY2014	us-gaap	Interest Expense InterestExpense	95000000	USD
CY2015Q1	us-gaap	Interest Expense InterestExpense	22000000	USD
CY2015Q2	us-gaap	Interest Expense InterestExpense	23000000	USD
CY2015Q3	us-gaap	Interest Expense InterestExpense	26000000	USD
CY2015Q4	us-gaap	Interest Expense InterestExpense	24000000	USD
CY2015	us-gaap	Interest Expense InterestExpense	95000000	USD
CY2013	us-gaap	Interest Expense Deposits InterestExpenseDeposits	55000000	USD
CY2014	us-gaap	Interest Expense Deposits InterestExpenseDeposits	45000000	USD
CY2015	us-gaap	Interest Expense Deposits InterestExpenseDeposits	43000000	USD
CY2013	us-gaap	Interest Expense Long Term Debt InterestExpenseLongTermDebt	57000000	USD
CY2014	us-gaap	Interest Expense Long Term Debt InterestExpenseLongTermDebt	50000000	USD
CY2015	us-gaap	Interest Expense Long Term Debt InterestExpenseLongTermDebt	52000000	USD
CY2013	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	1626000000	USD
CY2014	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	1628000000	USD
CY2015	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	1542000000	USD
CY2013	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	1672000000	USD
CY2014Q1	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	410000000	USD
CY2014Q2	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	416000000	USD
CY2014Q3	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	414000000	USD
CY2014Q4	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	415000000	USD
CY2014	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	1655000000	USD
CY2015Q1	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	413000000	USD
CY2015Q2	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	421000000	USD
CY2015Q3	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	422000000	USD
CY2015Q4	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	433000000	USD
CY2015	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	1689000000	USD
CY2013	us-gaap	Interest Paid InterestPaid	114000000	USD
CY2014	us-gaap	Interest Paid InterestPaid	101000000	USD
CY2015	us-gaap	Interest Paid InterestPaid	94000000	USD
CY2013	us-gaap	Labor And Related Expense LaborAndRelatedExpense	1009000000	USD
CY2014	us-gaap	Labor And Related Expense LaborAndRelatedExpense	980000000	USD
CY2015	us-gaap	Labor And Related Expense LaborAndRelatedExpense	1009000000	USD
CY2014Q4	us-gaap	Land Land	88000000	USD
CY2015Q4	us-gaap	Land Land	87000000	USD
CY2013	us-gaap	Lease And Rental Expense LeaseAndRentalExpense	78000000	USD
CY2014	us-gaap	Lease And Rental Expense LeaseAndRentalExpense	89000000	USD
CY2015	us-gaap	Lease And Rental Expense LeaseAndRentalExpense	79000000	USD
CY2013	us-gaap	Legal Fees LegalFees	24000000	USD
CY2014	us-gaap	Legal Fees LegalFees	24000000	USD
CY2015	us-gaap	Legal Fees LegalFees	21000000	USD
CY2014Q4	us-gaap	Letters Of Credit Outstanding Amount LettersOfCreditOutstandingAmount	4000000000	USD
CY2015Q4	us-gaap	Letters Of Credit Outstanding Amount LettersOfCreditOutstandingAmount	4000000000	USD
CY2014Q4	us-gaap	Liabilities Liabilities	61784000000	USD
CY2015Q4	us-gaap	Liabilities Liabilities	64317000000	USD
CY2014Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	69186000000	USD
CY2015Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	71877000000	USD
CY2015Q4	us-gaap	Line Of Credit Facility Current Borrowing Capacity LineOfCreditFacilityCurrentBorrowingCapacity	18000000000	USD
CY2014Q4	us-gaap	Loans And Leases Receivable Allowance LoansAndLeasesReceivableAllowance	594000000	USD
CY2015Q4	us-gaap	Loans And Leases Receivable Allowance LoansAndLeasesReceivableAllowance	634000000	USD
CY2014Q4	us-gaap	Loans And Leases Receivable Deferred Income LoansAndLeasesReceivableDeferredIncome	267000000	USD
CY2015Q4	us-gaap	Loans And Leases Receivable Deferred Income LoansAndLeasesReceivableDeferredIncome	226000000	USD
CY2014Q4	us-gaap	Loans And Leases Receivable Impaired Commitment To Lend LoansAndLeasesReceivableImpairedCommitmentToLend	3000000	USD
CY2015Q4	us-gaap	Loans And Leases Receivable Impaired Commitment To Lend LoansAndLeasesReceivableImpairedCommitmentToLend	6000000	USD
CY2014Q4	us-gaap	Loans And Leases Receivable Impaired Nonperforming Nonaccrual Of Interest LoansAndLeasesReceivableImpairedNonperformingNonaccrualOfInterest	273000000	USD
CY2015Q4	us-gaap	Loans And Leases Receivable Impaired Nonperforming Nonaccrual Of Interest LoansAndLeasesReceivableImpairedNonperformingNonaccrualOfInterest	367000000	USD
CY2014Q4	us-gaap	Loans And Leases Receivable Net Of Deferred Income LoansAndLeasesReceivableNetOfDeferredIncome	48593000000	USD
CY2015Q4	us-gaap	Loans And Leases Receivable Net Of Deferred Income LoansAndLeasesReceivableNetOfDeferredIncome	49084000000	USD
CY2014Q4	us-gaap	Loans And Leases Receivable Net Reported Amount LoansAndLeasesReceivableNetReportedAmount	47999000000	USD
CY2015Q4	us-gaap	Loans And Leases Receivable Net Reported Amount LoansAndLeasesReceivableNetReportedAmount	48450000000	USD
CY2014Q4	us-gaap	Loans And Leases Receivable Related Parties LoansAndLeasesReceivableRelatedParties	79000000	USD
CY2015Q4	us-gaap	Loans And Leases Receivable Related Parties LoansAndLeasesReceivableRelatedParties	121000000	USD
CY2015	us-gaap	Loans And Leases Receivable Related Parties Additions LoansAndLeasesReceivableRelatedPartiesAdditions	453000000	USD
CY2015	us-gaap	Loans And Leases Receivable Related Parties Collections LoansAndLeasesReceivableRelatedPartiesCollections	411000000	USD
CY2014Q4	us-gaap	Long Term Debt LongTermDebt	2675000000	USD
CY2015Q4	us-gaap	Long Term Debt LongTermDebt	3058000000	USD
CY2015Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal After Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive	750000000	USD
CY2015Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Next Twelve Months LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths	650000000	USD
CY2015Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive	682000000	USD
CY2015Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Four LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour	357000000	USD
CY2015Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Three LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree	2000000	USD
CY2015Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Two LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo	500000000	USD
CY2013	us-gaap	Loss Contingency Loss In Period LossContingencyLossInPeriod	52000000	USD
CY2014	us-gaap	Loss Contingency Loss In Period LossContingencyLossInPeriod	4000000	USD
CY2015	us-gaap	Loss Contingency Loss In Period LossContingencyLossInPeriod	-32000000	USD
CY2014	us-gaap	Loss On Contract Termination LossOnContractTermination	10000000	USD
CY2015Q4	us-gaap	Mortgage Loans In Process Of Foreclosure Amount MortgageLoansInProcessOfForeclosureAmount	1000000	USD
CY2013	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-93000000	USD
CY2014	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	2724000000	USD
CY2015	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	2469000000	USD
CY2013	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	1174000000	USD
CY2014	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-3743000000	USD
CY2015	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-3255000000	USD
CY2013	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	836000000	USD
CY2014	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	639000000	USD
CY2015	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	862000000	USD
CY2013	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	533000000	USD
CY2014Q1	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	137000000	USD
CY2014Q2	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	149000000	USD
CY2014Q3	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	152000000	USD
CY2014Q4	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	148000000	USD
CY2014	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	586000000	USD
CY2015Q1	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	132000000	USD
CY2015Q2	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	134000000	USD
CY2015Q3	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	134000000	USD
CY2015Q4	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	115000000	USD
CY2015	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	515000000	USD
CY2014Q4	us-gaap	Noninterest Bearing Deposit Liabilities NoninterestBearingDepositLiabilities	27224000000	USD
CY2015Q4	us-gaap	Noninterest Bearing Deposit Liabilities NoninterestBearingDepositLiabilities	30839000000	USD
CY2013	us-gaap	Noninterest Expense NoninterestExpense	1722000000	USD
CY2014Q1	us-gaap	Noninterest Expense NoninterestExpense	406000000	USD
CY2014Q2	us-gaap	Noninterest Expense NoninterestExpense	404000000	USD
CY2014Q3	us-gaap	Noninterest Expense NoninterestExpense	397000000	USD
CY2014Q4	us-gaap	Noninterest Expense NoninterestExpense	419000000	USD
CY2014	us-gaap	Noninterest Expense NoninterestExpense	1626000000	USD
CY2015Q1	us-gaap	Noninterest Expense NoninterestExpense	459000000	USD
CY2015Q2	us-gaap	Noninterest Expense NoninterestExpense	436000000	USD
CY2015Q3	us-gaap	Noninterest Expense NoninterestExpense	461000000	USD
CY2015Q4	us-gaap	Noninterest Expense NoninterestExpense	486000000	USD
CY2015	us-gaap	Noninterest Expense NoninterestExpense	1842000000	USD
CY2013	us-gaap	Noninterest Income NoninterestIncome	882000000	USD
CY2014	us-gaap	Noninterest Income NoninterestIncome	868000000	USD
CY2015	us-gaap	Noninterest Income NoninterestIncome	1050000000	USD
CY2013	us-gaap	Noninterest Income Other Operating Income NoninterestIncomeOtherOperatingIncome	156000000	USD
CY2014	us-gaap	Noninterest Income Other Operating Income NoninterestIncomeOtherOperatingIncome	130000000	USD
CY2015	us-gaap	Noninterest Income Other Operating Income NoninterestIncomeOtherOperatingIncome	103000000	USD
CY2015	us-gaap	Number Of Reporting Units NumberOfReportingUnits	3
CY2013	us-gaap	Occupancy Net OccupancyNet	160000000	USD
CY2014	us-gaap	Occupancy Net OccupancyNet	171000000	USD
CY2015	us-gaap	Occupancy Net OccupancyNet	159000000	USD
CY2015Q4	us-gaap	Operating Leases Future Minimum Payments Due OperatingLeasesFutureMinimumPaymentsDue	456000000	USD
CY2015Q4	us-gaap	Operating Leases Future Minimum Payments Due Current OperatingLeasesFutureMinimumPaymentsDueCurrent	73000000	USD
CY2015Q4	us-gaap	Operating Leases Future Minimum Payments Due In Five Years OperatingLeasesFutureMinimumPaymentsDueInFiveYears	44000000	USD
CY2015Q4	us-gaap	Operating Leases Future Minimum Payments Due In Four Years OperatingLeasesFutureMinimumPaymentsDueInFourYears	53000000	USD
CY2015Q4	us-gaap	Operating Leases Future Minimum Payments Due In Three Years OperatingLeasesFutureMinimumPaymentsDueInThreeYears	62000000	USD
CY2015Q4	us-gaap	Operating Leases Future Minimum Payments Due In Two Years OperatingLeasesFutureMinimumPaymentsDueInTwoYears	70000000	USD
CY2015Q4	us-gaap	Operating Leases Future Minimum Payments Due Thereafter OperatingLeasesFutureMinimumPaymentsDueThereafter	154000000	USD
CY2014Q4	us-gaap	Other Assets OtherAssets	4434000000	USD
CY2015Q4	us-gaap	Other Assets OtherAssets	4117000000	USD
CY2013	us-gaap	Other Comprehensive Income Defined Benefit Plan Net Prior Service Cost Credit Arising During Period Before Tax OtherComprehensiveIncomeDefinedBenefitPlanNetPriorServiceCostCreditArisingDuringPeriodBeforeTax	0	USD
CY2014	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 Plan Net Prior Service Cost Credit Arising During Period Before Tax OtherComprehensiveIncomeDefinedBenefitPlanNetPriorServiceCostCreditArisingDuringPeriodBeforeTax	-3000000	USD
CY2013	us-gaap	Other Comprehensive Income Defined Benefit Plans Net Unamortized Gain Loss Arising During Period Net Of Tax OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax	183000000	USD
CY2014	us-gaap	Other Comprehensive Income Defined Benefit Plans Net Unamortized Gain Loss Arising During Period Net Of Tax OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax	-153000000	USD
CY2015	us-gaap	Other Comprehensive Income Defined Benefit Plans Net Unamortized Gain Loss Arising During Period Net Of Tax OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax	-35000000	USD
CY2013	us-gaap	Other Comprehensive Income Defined Benefit Plans Net Unamortized Gain Loss Arising During Period Tax OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodTax	103000000	USD
CY2014	us-gaap	Other Comprehensive Income Defined Benefit Plans Net Unamortized Gain Loss Arising During Period Tax OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodTax	-87000000	USD
CY2015	us-gaap	Other Comprehensive Income Defined Benefit Plans Net Unamortized Gain Loss Arising During Period Tax OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodTax	-19000000	USD
CY2013	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	2000000	USD
CY2014	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	3000000	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
CY2013	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Before Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeTax	-344000000	USD
CY2014	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Before Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeTax	165000000	USD
CY2015	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Before Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeTax	-45000000	USD
CY2013	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	-218000000	USD
CY2014	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	105000000	USD
CY2015	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	-28000000	USD
CY2013	us-gaap	Other Comprehensive Income Loss Before Tax OtherComprehensiveIncomeLossBeforeTax	33000000	USD
CY2014	us-gaap	Other Comprehensive Income Loss Before Tax OtherComprehensiveIncomeLossBeforeTax	-33000000	USD
CY2015	us-gaap	Other Comprehensive Income Loss Before Tax OtherComprehensiveIncomeLossBeforeTax	-28000000	USD
CY2013	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	22000000	USD
CY2014	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-21000000	USD
CY2015	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-17000000	USD
CY2013	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Before Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeTax	-377000000	USD
CY2014	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Before Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeTax	198000000	USD
CY2015	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Before Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeTax	-17000000	USD
CY2013	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	-240000000	USD
CY2014	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	126000000	USD
CY2015	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	-11000000	USD
CY2013	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Net Unamortized Gain Loss Arising During Period Before Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansNetUnamortizedGainLossArisingDuringPeriodBeforeTax	286000000	USD
CY2014	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Net Unamortized Gain Loss Arising During Period Before Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansNetUnamortizedGainLossArisingDuringPeriodBeforeTax	-240000000	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
CY2013	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax	1000000	USD
CY2014	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax	1000000	USD
CY2015	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax	-2000000	USD
CY2013	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax	1000000	USD
CY2014	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax	1000000	USD
CY2015	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax	-1000000	USD
CY2013	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax	0	USD
CY2014	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 For Sale Of Securities Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax	-1000000	USD
CY2013	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansBeforeTax	286000000	USD
CY2014	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansBeforeTax	-240000000	USD
CY2015	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansBeforeTax	-54000000	USD
CY2013	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Gain Loss Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossBeforeTax	-89000000	USD
CY2014	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Gain Loss Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossBeforeTax	-39000000	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
CY2013	us-gaap	Other Comprehensive Income Loss Tax OtherComprehensiveIncomeLossTax	11000000	USD
CY2014	us-gaap	Other Comprehensive Income Loss Tax OtherComprehensiveIncomeLossTax	-12000000	USD
CY2015	us-gaap	Other Comprehensive Income Loss Tax OtherComprehensiveIncomeLossTax	-11000000	USD
CY2013	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	-343000000	USD
CY2014	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	166000000	USD
CY2015	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	-55000000	USD
CY2013	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	-217000000	USD
CY2014	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	106000000	USD
CY2015	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	-34000000	USD
CY2013	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	-126000000	USD
CY2014	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	60000000	USD
CY2015	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	-21000000	USD
CY2013	us-gaap	Other Interest And Dividend Income OtherInterestAndDividendIncome	14000000	USD
CY2014	us-gaap	Other Interest And Dividend Income OtherInterestAndDividendIncome	14000000	USD
CY2015	us-gaap	Other Interest And Dividend Income OtherInterestAndDividendIncome	17000000	USD
CY2014Q4	us-gaap	Other Liabilities OtherLiabilities	1507000000	USD
CY2015Q4	us-gaap	Other Liabilities OtherLiabilities	1383000000	USD
CY2013	us-gaap	Other Noninterest Expense OtherNoninterestExpense	179000000	USD
CY2014	us-gaap	Other Noninterest Expense OtherNoninterestExpense	173000000	USD
CY2015	us-gaap	Other Noninterest Expense OtherNoninterestExpense	161000000	USD
CY2014Q4	us-gaap	Other Short Term Investments OtherShortTermInvestments	99000000	USD
CY2015Q4	us-gaap	Other Short Term Investments OtherShortTermInvestments	113000000	USD
CY2013	us-gaap	Payments For Proceeds From Federal Home Loan Bank Stock PaymentsForProceedsFromFederalHomeLoanBankStock	-41000000	USD
CY2014	us-gaap	Payments For Proceeds From Federal Home Loan Bank Stock PaymentsForProceedsFromFederalHomeLoanBankStock	-41000000	USD
CY2015	us-gaap	Payments For Proceeds From Federal Home Loan Bank Stock PaymentsForProceedsFromFederalHomeLoanBankStock	0	USD
CY2013	us-gaap	Payments For Proceeds From Loans And Leases PaymentsForProceedsFromLoansAndLeases	-549000000	USD
CY2014	us-gaap	Payments For Proceeds From Loans And Leases PaymentsForProceedsFromLoansAndLeases	3144000000	USD
CY2015	us-gaap	Payments For Proceeds From Loans And Leases PaymentsForProceedsFromLoansAndLeases	644000000	USD
CY2013	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	-7000000	USD
CY2014	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	-1000000	USD
CY2015	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	-5000000	USD
CY2013	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	291000000	USD
CY2014	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	260000000	USD
CY2015	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	240000000	USD
CY2013	us-gaap	Payments For Repurchase Of Warrants PaymentsForRepurchaseOfWarrants	0	USD
CY2014	us-gaap	Payments For Repurchase Of Warrants PaymentsForRepurchaseOfWarrants	0	USD
CY2015	us-gaap	Payments For Repurchase Of Warrants PaymentsForRepurchaseOfWarrants	10000000	USD
CY2013	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	123000000	USD
CY2014	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	137000000	USD
CY2015	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	147000000	USD
CY2013	us-gaap	Payments To Acquire Available For Sale Securities PaymentsToAcquireAvailableForSaleSecurities	2225000000	USD
CY2014	us-gaap	Payments To Acquire Available For Sale Securities PaymentsToAcquireAvailableForSaleSecurities	2372000000	USD
CY2015	us-gaap	Payments To Acquire Available For Sale Securities PaymentsToAcquireAvailableForSaleSecurities	4228000000	USD
CY2013	us-gaap	Payments To Acquire Held To Maturity Securities PaymentsToAcquireHeldToMaturitySecurities	0	USD
CY2014	us-gaap	Payments To Acquire Held To Maturity Securities PaymentsToAcquireHeldToMaturitySecurities	0	USD
CY2015	us-gaap	Payments To Acquire Held To Maturity Securities PaymentsToAcquireHeldToMaturitySecurities	362000000	USD
CY2013	us-gaap	Pension Expense PensionExpense	86000000	USD
CY2014	us-gaap	Pension Expense PensionExpense	39000000	USD
CY2015	us-gaap	Pension Expense PensionExpense	47000000	USD
CY2015Q4	us-gaap	Pledged Financial Instruments Not Separately Reported Loans Receivable Pledged For Federal Home Loan Bank Debt PledgedFinancialInstrumentsNotSeparatelyReportedLoansReceivablePledgedForFederalHomeLoanBankDebt	14000000000	USD
CY2015Q4	us-gaap	Pledged Financial Instruments Not Separately Reported Loans Receivable Pledged For Other Arrangements PledgedFinancialInstrumentsNotSeparatelyReportedLoansReceivablePledgedForOtherArrangements	24000000000	USD
CY2013	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	0	USD
CY2014	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	596000000	USD
CY2015	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	1016000000	USD
CY2013	us-gaap	Proceeds From Issuance Of Shares Under Incentive And Share Based Compensation Plans Including Stock Options ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions	33000000	USD
CY2014	us-gaap	Proceeds From Issuance Of Shares Under Incentive And Share Based Compensation Plans Including Stock Options ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions	49000000	USD
CY2015	us-gaap	Proceeds From Issuance Of Shares Under Incentive And Share Based Compensation Plans Including Stock Options ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions	22000000	USD
CY2013	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	2849000000	USD
CY2014	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	1781000000	USD
CY2015	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	1703000000	USD
CY2013	us-gaap	Proceeds From Maturities Prepayments And Calls Of Held To Maturity Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfHeldToMaturitySecurities	0	USD
CY2014	us-gaap	Proceeds From Maturities Prepayments And Calls Of Held To Maturity Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfHeldToMaturitySecurities	0	USD
CY2015	us-gaap	Proceeds From Maturities Prepayments And Calls Of Held To Maturity Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfHeldToMaturitySecurities	324000000	USD
CY2013	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-7000000	USD
CY2014	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-1000000	USD
CY2015	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-5000000	USD
CY2013	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	143000000	USD
CY2014	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	-137000000	USD
CY2015	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	-93000000	USD
CY2013	us-gaap	Proceeds From Sale Of Available For Sale Securities ProceedsFromSaleOfAvailableForSaleSecurities	0	USD
CY2014	us-gaap	Proceeds From Sale Of Available For Sale Securities ProceedsFromSaleOfAvailableForSaleSecurities	0	USD
CY2015	us-gaap	Proceeds From Sale Of Available For Sale Securities ProceedsFromSaleOfAvailableForSaleSecurities	54000000	USD
CY2013	us-gaap	Proceeds From Sale Of Foreclosed Assets ProceedsFromSaleOfForeclosedAssets	55000000	USD
CY2014	us-gaap	Proceeds From Sale Of Foreclosed Assets ProceedsFromSaleOfForeclosedAssets	20000000	USD
CY2015	us-gaap	Proceeds From Sale Of Foreclosed Assets ProceedsFromSaleOfForeclosedAssets	12000000	USD
CY2013	us-gaap	Profit Loss ProfitLoss	541000000	USD
CY2014Q1	us-gaap	Profit Loss ProfitLoss	139000000	USD
CY2014Q2	us-gaap	Profit Loss ProfitLoss	151000000	USD
CY2014Q3	us-gaap	Profit Loss ProfitLoss	154000000	USD
CY2014Q4	us-gaap	Profit Loss ProfitLoss	149000000	USD
CY2014	us-gaap	Profit Loss ProfitLoss	593000000	USD
CY2015Q1	us-gaap	Profit Loss ProfitLoss	134000000	USD
CY2015Q2	us-gaap	Profit Loss ProfitLoss	135000000	USD
CY2015Q3	us-gaap	Profit Loss ProfitLoss	136000000	USD
CY2015Q4	us-gaap	Profit Loss ProfitLoss	116000000	USD
CY2015	us-gaap	Profit Loss ProfitLoss	521000000	USD
CY2014Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	1404000000	USD
CY2015Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	1439000000	USD
CY2014Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	532000000	USD
CY2015Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	550000000	USD
CY2013	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	46000000	USD
CY2014	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	27000000	USD
CY2015	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	147000000	USD
CY2013	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	46000000	USD
CY2014Q1	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	9000000	USD
CY2014Q2	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	11000000	USD
CY2014Q3	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	5000000	USD
CY2014Q4	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	2000000	USD
CY2014	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	27000000	USD
CY2015Q1	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	14000000	USD
CY2015Q2	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	47000000	USD
CY2015Q3	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	26000000	USD
CY2015Q4	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	60000000	USD
CY2015Q4	us-gaap	Tier One Risk Based Capital Required To Be Well Capitalized To Risk Weighted Assets TierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets	0.06
CY2015Q4	us-gaap	Time Deposit Maturities After Year Five TimeDepositMaturitiesAfterYearFive	23000000	USD
CY2015Q4	us-gaap	Time Deposit Maturities Year Five TimeDepositMaturitiesYearFive	51000000	USD
CY2015Q4	us-gaap	Time Deposit Maturities Year Four TimeDepositMaturitiesYearFour	83000000	USD
CY2015Q4	us-gaap	Time Deposit Maturities Year One TimeDepositMaturitiesYearOne	2792000000	USD
CY2015Q4	us-gaap	Time Deposit Maturities Year Three TimeDepositMaturitiesYearThree	132000000	USD
CY2015Q4	us-gaap	Time Deposit Maturities Year Two TimeDepositMaturitiesYearTwo	503000000	USD
CY2015	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	147000000	USD
CY2013	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	1080000000	USD
CY2014	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	1406000000	USD
CY2015	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	606000000	USD
CY2014Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	6744000000	USD
CY2015Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	7084000000	USD
CY2013	us-gaap	Share Based Compensation ShareBasedCompensation	35000000	USD
CY2014	us-gaap	Share Based Compensation ShareBasedCompensation	38000000	USD
CY2015	us-gaap	Share Based Compensation ShareBasedCompensation	38000000	USD
CY2013	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Dividend Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate	0.0300
CY2014	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 Dividend Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate	0.0300
CY2013	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Volatility Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate	0.34
CY2014	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Volatility Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate	0.31
CY2015	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Volatility Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate	0.33
CY2013	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Risk Free Interest Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate	0.0194
CY2014	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Risk Free Interest Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate	0.0295
CY2015	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Risk Free Interest Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate	0.0183
CY2015Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Authorized ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized	19400000	shares
CY2015Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Available For Grant ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant	9800000	shares
CY2013	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Total Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue	14000000	USD
CY2014	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Total Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue	23000000	USD
CY2015	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Total Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue	12000000	USD
CY2013	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue	9.07
CY2014	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue	13.21
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
CY2013	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Fair Value Assumptions Expected Term1 SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1	P6Y4M24D
CY2014	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Fair Value Assumptions Expected Term1 SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1	P5Y9M18D
CY2015	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Fair Value Assumptions Expected Term1 SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1	P6Y10M24D
CY2014Q4	us-gaap	Short Term Borrowings ShortTermBorrowings	116000000	USD
CY2015Q4	us-gaap	Short Term Borrowings ShortTermBorrowings	23000000	USD
CY2015Q4	us-gaap	Statutory Accounting Practices Statutory Amount Available For Dividend Payments With Regulatory Approval StatutoryAccountingPracticesStatutoryAmountAvailableForDividendPaymentsWithRegulatoryApproval	398000000	USD
CY2013	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	30000000	USD
CY2014	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	45000000	USD
CY2015	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	14000000	USD
CY2012Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	6939000000	USD
CY2013Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	7150000000	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
CY2013	us-gaap	Stockholders Equity Other StockholdersEquityOther	0	USD
CY2014	us-gaap	Stockholders Equity Other StockholdersEquityOther	0	USD
CY2015	us-gaap	Subsequent Event Description SubsequentEventDescription	Subsequent to December 31, 2015, oil and gas prices dropped significantly. The allowance for loan losses allocation for energy and energy-related loans was based upon energy prices and conditions in existence at the balance sheet date.
CY2014Q4	us-gaap	Tier One Risk Based Capital Required To Be Well Capitalized To Risk Weighted Assets TierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets	0.06
CY2015Q4	us-gaap	Time Deposits TimeDeposits	3584000000	USD
CY2013	us-gaap	Transfer Of Portfolio Loans And Leases To Held For Sale1 TransferOfPortfolioLoansAndLeasesToHeldForSale1	0	USD
CY2014	us-gaap	Transfer Of Portfolio Loans And Leases To Held For Sale1 TransferOfPortfolioLoansAndLeasesToHeldForSale1	0	USD
CY2015	us-gaap	Transfer Of Portfolio Loans And Leases To Held For Sale1 TransferOfPortfolioLoansAndLeasesToHeldForSale1	28000000	USD
CY2013	us-gaap	Transfer To Other Real Estate TransferToOtherRealEstate	14000000	USD
CY2014	us-gaap	Transfer To Other Real Estate TransferToOtherRealEstate	16000000	USD
CY2015	us-gaap	Transfer To Other Real Estate TransferToOtherRealEstate	12000000	USD
CY2014Q4	us-gaap	Treasury Stock Shares TreasuryStockShares	49146225	shares
CY2015Q4	us-gaap	Treasury Stock Shares TreasuryStockShares	52457113	shares
CY2014Q4	us-gaap	Treasury Stock Value TreasuryStockValue	2259000000	USD
CY2015Q4	us-gaap	Treasury Stock Value TreasuryStockValue	2409000000	USD
CY2013	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	291000000	USD
CY2014	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	260000000	USD
CY2015	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	240000000	USD
CY2015Q4	us-gaap	Unamortized Debt Issuance Expense UnamortizedDebtIssuanceExpense	8000000	USD
CY2013	us-gaap	Undistributed Earnings Loss Allocated To Participating Securities Diluted UndistributedEarningsLossAllocatedToParticipatingSecuritiesDiluted	8000000	USD
CY2014Q1	us-gaap	Undistributed Earnings Loss Allocated To Participating Securities Diluted UndistributedEarningsLossAllocatedToParticipatingSecuritiesDiluted	2000000	USD
CY2014Q2	us-gaap	Undistributed Earnings Loss Allocated To Participating Securities Diluted UndistributedEarningsLossAllocatedToParticipatingSecuritiesDiluted	2000000	USD
CY2014Q3	us-gaap	Undistributed Earnings Loss Allocated To Participating Securities Diluted UndistributedEarningsLossAllocatedToParticipatingSecuritiesDiluted	2000000	USD
CY2014Q4	us-gaap	Undistributed Earnings Loss Allocated To Participating Securities Diluted UndistributedEarningsLossAllocatedToParticipatingSecuritiesDiluted	1000000	USD
CY2014	us-gaap	Undistributed Earnings Loss Allocated To Participating Securities Diluted UndistributedEarningsLossAllocatedToParticipatingSecuritiesDiluted	7000000	USD
CY2015Q1	us-gaap	Undistributed Earnings Loss Allocated To Participating Securities Diluted UndistributedEarningsLossAllocatedToParticipatingSecuritiesDiluted	2000000	USD
CY2015Q2	us-gaap	Undistributed Earnings Loss Allocated To Participating Securities Diluted UndistributedEarningsLossAllocatedToParticipatingSecuritiesDiluted	1000000	USD
CY2015Q3	us-gaap	Undistributed Earnings Loss Allocated To Participating Securities Diluted UndistributedEarningsLossAllocatedToParticipatingSecuritiesDiluted	2000000	USD
CY2015Q4	us-gaap	Undistributed Earnings Loss Allocated To Participating Securities Diluted UndistributedEarningsLossAllocatedToParticipatingSecuritiesDiluted	1000000	USD
CY2015	us-gaap	Undistributed Earnings Loss Allocated To Participating Securities Diluted UndistributedEarningsLossAllocatedToParticipatingSecuritiesDiluted	6000000	USD
CY2012Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	42000000	USD
CY2013Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	11000000	USD
CY2014Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	14000000	USD
CY2015Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	22000000	USD
CY2013	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	31000000	USD
CY2014	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	0	USD
CY2015	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	0	USD
CY2014Q4	us-gaap	Unrecognized Tax Benefits Income Tax Penalties And Interest Accrued UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued	2000000	USD
CY2015Q4	us-gaap	Unrecognized Tax Benefits Income Tax Penalties And Interest Accrued UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued	3000000	USD
CY2013	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	0	USD
CY2014	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	3000000	USD
CY2015	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	8000000	USD
CY2014Q4	us-gaap	Unrecognized Tax Benefits That Would Impact Effective Tax Rate UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate	2000000	USD
CY2015Q4	us-gaap	Unrecognized Tax Benefits That Would Impact Effective Tax Rate UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate	4000000	USD
CY2013	us-gaap	Variable Interest Entity Financial Or Other Support Amount VariableInterestEntityFinancialOrOtherSupportAmount	0	USD
CY2014	us-gaap	Variable Interest Entity Financial Or Other Support Amount VariableInterestEntityFinancialOrOtherSupportAmount	0	USD
CY2015	us-gaap	Variable Interest Entity Financial Or Other Support Amount VariableInterestEntityFinancialOrOtherSupportAmount	0	USD
CY2015Q4	us-gaap	Variable Interest Entity Nonconsolidated Carrying Amount Liabilities VariableInterestEntityNonconsolidatedCarryingAmountLiabilities	143000000	USD
CY2013	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	187000000	shares
CY2014	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	185000000	shares
CY2015	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	181000000	shares
CY2013	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	183000000	shares
CY2014	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	179000000	shares
CY2015	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	176000000	shares
CY2015	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

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$CMA
Comerica Inc Stock $cma

2014 Q4 Form 10-K Financial Statement

#000002841216000196 Filed on February 26, 2016

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$CMA Comerica Inc Stock $cma

2014 Q4 Form 10-K Financial Statement

#000002841216000196 Filed on February 26, 2016

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$CMA
Comerica Inc Stock $cma