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Consolidated Statements Of Cash Flows (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
OPERATING ACTIVITIES      
Net income $ 593us-gaap_ProfitLoss $ 541us-gaap_ProfitLoss $ 521us-gaap_ProfitLoss
Adjustments to reconcile net income to net cash provided by operating activities:      
Provision for credit losses 27us-gaap_ProvisionForLoanLeaseAndOtherLosses 46us-gaap_ProvisionForLoanLeaseAndOtherLosses 79us-gaap_ProvisionForLoanLeaseAndOtherLosses
Provision (benefit) for deferred income taxes 130us-gaap_DeferredIncomeTaxExpenseBenefit (20)us-gaap_DeferredIncomeTaxExpenseBenefit 158us-gaap_DeferredIncomeTaxExpenseBenefit
Depreciation and amortization 123us-gaap_DepreciationAndAmortization 122us-gaap_DepreciationAndAmortization 133us-gaap_DepreciationAndAmortization
Net periodic defined benefit cost 40us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost 88us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost 81us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost
Share-based compensation expense 38us-gaap_ShareBasedCompensation 35us-gaap_ShareBasedCompensation 37us-gaap_ShareBasedCompensation
Net amortization of securities 13us-gaap_AccretionAmortizationOfDiscountsAndPremiumsInvestments 23us-gaap_AccretionAmortizationOfDiscountsAndPremiumsInvestments 48us-gaap_AccretionAmortizationOfDiscountsAndPremiumsInvestments
Accretion of loan purchase discount (34)cma_AccretionOfDiscountOnReceivablesAcquiredInTransfer (49)cma_AccretionOfDiscountOnReceivablesAcquiredInTransfer (71)cma_AccretionOfDiscountOnReceivablesAcquiredInTransfer
Net securities losses (gains) 0us-gaap_GainLossOnSaleOfSecuritiesNet 1us-gaap_GainLossOnSaleOfSecuritiesNet (12)us-gaap_GainLossOnSaleOfSecuritiesNet
Net (gain) loss/writedown on foreclosed property (4)us-gaap_GainLossOnSaleOfOtherAssets 4us-gaap_GainLossOnSaleOfOtherAssets 0us-gaap_GainLossOnSaleOfOtherAssets
Gain on debt redemption (32)us-gaap_GainsLossesOnExtinguishmentOfDebt (1)us-gaap_GainsLossesOnExtinguishmentOfDebt 0us-gaap_GainsLossesOnExtinguishmentOfDebt
Excess tax benefits from share-based compensation arrangements (7)us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities (3)us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities (1)us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities
Net change in trading securities 13us-gaap_IncreaseDecreaseInTradingSecurities 6us-gaap_IncreaseDecreaseInTradingSecurities 1us-gaap_IncreaseDecreaseInTradingSecurities
Net change in accrued income receivable (4)us-gaap_IncreaseDecreaseInOtherOperatingAssets 7us-gaap_IncreaseDecreaseInOtherOperatingAssets 5us-gaap_IncreaseDecreaseInOtherOperatingAssets
Net change in accrued expenses payable (14)us-gaap_IncreaseDecreaseInAccruedLiabilities 38us-gaap_IncreaseDecreaseInAccruedLiabilities 35us-gaap_IncreaseDecreaseInAccruedLiabilities
Other, net (243)us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet (2)us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet (322)us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet
Net cash provided by operating activities 639us-gaap_NetCashProvidedByUsedInOperatingActivities 836us-gaap_NetCashProvidedByUsedInOperatingActivities 692us-gaap_NetCashProvidedByUsedInOperatingActivities
INVESTING ACTIVITIES      
Maturities and redemptions of investment securities 1,781us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities 2,849us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities 3,839us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities
Purchases of investment securities (2,372)us-gaap_PaymentsToAcquireAvailableForSaleSecurities (2,225)us-gaap_PaymentsToAcquireAvailableForSaleSecurities (4,032)us-gaap_PaymentsToAcquireAvailableForSaleSecurities
Net change in loans (3,144)us-gaap_PaymentsForProceedsFromLoansAndLeases 549us-gaap_PaymentsForProceedsFromLoansAndLeases (3,498)us-gaap_PaymentsForProceedsFromLoansAndLeases
Sales of Federal Home Loan Bank stock 41us-gaap_PaymentsForProceedsFromFederalHomeLoanBankStock 41us-gaap_PaymentsForProceedsFromFederalHomeLoanBankStock 3us-gaap_PaymentsForProceedsFromFederalHomeLoanBankStock
Proceeds from sales of foreclosed property 20us-gaap_ProceedsFromSaleOfForeclosedAssets 55us-gaap_ProceedsFromSaleOfForeclosedAssets 82us-gaap_ProceedsFromSaleOfForeclosedAssets
Net increase in premises and equipment (70)cma_NetIncreaseInFixedAssets (102)cma_NetIncreaseInFixedAssets (75)cma_NetIncreaseInFixedAssets
Other, net 1us-gaap_PaymentsForProceedsFromOtherInvestingActivities 7us-gaap_PaymentsForProceedsFromOtherInvestingActivities 5us-gaap_PaymentsForProceedsFromOtherInvestingActivities
Net cash (used in) provided by investing activities (3,743)us-gaap_NetCashProvidedByUsedInInvestingActivities 1,174us-gaap_NetCashProvidedByUsedInInvestingActivities (3,676)us-gaap_NetCashProvidedByUsedInInvestingActivities
FINANCING ACTIVITIES      
Net change in deposits 4,013us-gaap_IncreaseDecreaseInDeposits 1,229us-gaap_IncreaseDecreaseInDeposits 4,520us-gaap_IncreaseDecreaseInDeposits
Net change in short-term borrowings (137)us-gaap_ProceedsFromRepaymentsOfShortTermDebt 143us-gaap_ProceedsFromRepaymentsOfShortTermDebt 40us-gaap_ProceedsFromRepaymentsOfShortTermDebt
Maturities and redemptions of medium- and long-term debt (1,406)us-gaap_RepaymentsOfLongTermDebt (1,080)us-gaap_RepaymentsOfLongTermDebt (193)us-gaap_RepaymentsOfLongTermDebt
Issuances of medium- and long-term debt 596us-gaap_ProceedsFromIssuanceOfLongTermDebt 0us-gaap_ProceedsFromIssuanceOfLongTermDebt 0us-gaap_ProceedsFromIssuanceOfLongTermDebt
Repurchases of common stock (260)us-gaap_PaymentsForRepurchaseOfCommonStock (291)us-gaap_PaymentsForRepurchaseOfCommonStock (308)us-gaap_PaymentsForRepurchaseOfCommonStock
Cash dividends paid on common stock (137)us-gaap_PaymentsOfDividendsCommonStock (123)us-gaap_PaymentsOfDividendsCommonStock (97)us-gaap_PaymentsOfDividendsCommonStock
Issuances of common stock under employee stock plans 49us-gaap_ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions 33us-gaap_ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions 3us-gaap_ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions
Excess tax benefits from share-based compensation arrangements 7us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities 3us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities 1us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities
Other, net (1)us-gaap_ProceedsFromPaymentsForOtherFinancingActivities (7)us-gaap_ProceedsFromPaymentsForOtherFinancingActivities (4)us-gaap_ProceedsFromPaymentsForOtherFinancingActivities
Net cash provided by (used in) financing activities 2,724us-gaap_NetCashProvidedByUsedInFinancingActivities (93)us-gaap_NetCashProvidedByUsedInFinancingActivities 3,962us-gaap_NetCashProvidedByUsedInFinancingActivities
Net (decrease) increase in cash and cash equivalents (380)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease 1,917us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease 978us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Cash and cash equivalents at beginning of period 6,451us-gaap_CashAndCashEquivalentsAtCarryingValue 4,534us-gaap_CashAndCashEquivalentsAtCarryingValue 3,556us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash and cash equivalents at end of period 6,071us-gaap_CashAndCashEquivalentsAtCarryingValue 6,451us-gaap_CashAndCashEquivalentsAtCarryingValue 4,534us-gaap_CashAndCashEquivalentsAtCarryingValue
Interest paid 101us-gaap_InterestPaid 114us-gaap_InterestPaid 135us-gaap_InterestPaid
Income taxes, tax deposits and tax-related interest paid 218us-gaap_IncomeTaxesPaidNet 115us-gaap_IncomeTaxesPaidNet 46us-gaap_IncomeTaxesPaidNet
Loans transferred to other real estate 16us-gaap_TransferToOtherRealEstate 14us-gaap_TransferToOtherRealEstate 42us-gaap_TransferToOtherRealEstate
Securities transferred from available-for-sale to held-to-maturity $ 1,958cma_TransferOfAvailableForSaleSecuritiesToHeldToMaturitySecurities $ 0cma_TransferOfAvailableForSaleSecuritiesToHeldToMaturitySecurities $ 0cma_TransferOfAvailableForSaleSecuritiesToHeldToMaturitySecurities