$CMA
COMERICA INC /NEW/ Stock $cma

$cma Overview Financials Valuation SEC Filings Company Website

2019 Q4 Form 10-Q Financial Statement

#000002841219000119 Filed on October 30, 2019

Income Statement

Concept	2019 Q4	2019 Q3	2018 Q3
Revenue	$659.0M	$711.0M	$675.0M
YoY Change	-6.39%	5.33%	16.58%
Cost Of Revenue
YoY Change
Gross Profit
YoY Change
Gross Profit Margin
Selling, General & Admin
YoY Change
% of Gross Profit
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$30.00M	$27.00M	$30.00M
YoY Change	0.0%	-10.0%	-3.23%
% of Gross Profit
Operating Expenses
YoY Change
Operating Profit
YoY Change
Interest Expense	$115.0M	$125.0M	$76.00M
YoY Change	27.78%	64.47%	130.3%
% of Operating Profit
Other Income/Expense, Net
YoY Change
Pretax Income	$351.0M	$372.0M	$381.0M
YoY Change	-12.25%	-2.36%	14.07%
Income Tax	$82.00M	$80.00M	$63.00M
% Of Pretax Income	23.36%	21.51%	16.54%
Net Earnings	$269.0M	$292.0M	$318.0M
YoY Change	-13.23%	-8.18%	40.71%
Net Earnings / Revenue	40.82%	41.07%	47.11%
Basic Earnings Per Share	$1.87	$1.98	$1.89
Diluted Earnings Per Share	$1.85	$1.96	$1.86
COMMON SHARES
Basic Shares Outstanding	144.2M shares	147.0M shares	167.0M shares
Diluted Shares Outstanding		148.0M shares	170.0M shares

Balance Sheet

Concept	2019 Q4	2019 Q3	2018 Q3
SHORT-TERM ASSETS
Cash & Short-Term Investments
YoY Change
Cash & Equivalents	$5.818B	$4.117B	$5.839B
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	$457.0M	$467.0M	$472.0M
YoY Change	-3.79%	-1.06%	1.07%
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	$73.40B	$72.85B	$71.45B
YoY Change	3.65%	1.96%	-0.79%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable
YoY Change
Accrued Expenses	$1.440B	$1.477B	$1.154B
YoY Change	15.85%	27.99%	13.36%
Deferred Revenue
YoY Change
Short-Term Debt	$71.00M	$51.00M	$84.00M
YoY Change	61.36%	-39.29%	-83.5%
Long-Term Debt Due
YoY Change
Total Short-Term Liabilities	$1.440B	$1.477B	$1.154B
YoY Change	15.85%	27.99%	13.36%
LONG-TERM LIABILITIES
Long-Term Debt	$3.469B	$3.511B	$2.618B
YoY Change	30.27%	34.11%	42.51%
Other Long-Term Liabilities
YoY Change
Total Long-Term Liabilities	$3.469B	$3.511B	$2.618B
YoY Change	30.27%	34.11%	42.51%
TOTAL LIABILITIES
Total Short-Term Liabilities	$1.440B	$1.477B	$1.154B
Total Long-Term Liabilities	$3.469B	$3.511B	$2.618B
Total Liabilities	$66.08B	$65.65B	$63.66B
YoY Change	4.37%	3.12%	-0.5%
SHAREHOLDERS EQUITY
Retained Earnings	$9.538B	$9.369B	$8.587B
YoY Change	8.62%	9.11%	10.86%
Common Stock	$3.315B	$3.313B	$3.285B
YoY Change	0.79%	0.85%	0.98%
Preferred Stock
YoY Change
Treasury Stock (at cost)	$5.291B	$5.146B	$3.475B
YoY Change	33.81%	48.09%	33.35%
Treasury Stock Shares	86.07M shares	84.03M shares	62.22M shares
Shareholders Equity	$7.327B	$7.200B	$7.786B
YoY Change
Total Liabilities & Shareholders Equity	$73.40B	$72.85B	$71.45B
YoY Change	3.65%	1.96%	-0.79%

Cashflow Statement

Concept	2019 Q4	2019 Q3	2018 Q3
OPERATING ACTIVITIES
Net Income	$269.0M	$292.0M	$318.0M
YoY Change	-13.23%	-8.18%	40.71%
Depreciation, Depletion And Amortization	$30.00M	$27.00M	$30.00M
YoY Change	0.0%	-10.0%	-3.23%
Cash From Operating Activities	$221.0M	$444.0M	$353.0M
YoY Change	-65.95%	25.78%	76.5%
INVESTING ACTIVITIES
Capital Expenditures	-$24.00M	-$33.00M	-$24.00M
YoY Change	-4.0%	37.5%	50.0%
Acquisitions
YoY Change
Other Investing Activities	$1.120B	$264.0M	$767.0M
YoY Change	-196.72%	-65.58%	243.95%
Cash From Investing Activities	$1.096B	$231.0M	$743.0M
YoY Change	-192.65%	-68.91%	258.94%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net
YoY Change
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	384.0M	-139.0M	-917.0M
YoY Change	-151.61%	-84.84%	-652.41%
NET CHANGE
Cash From Operating Activities	221.0M	444.0M	353.0M
Cash From Investing Activities	1.096B	231.0M	743.0M
Cash From Financing Activities	384.0M	-139.0M	-917.0M
Net Change In Cash	1.701B	536.0M	179.0M
YoY Change	-233.1%	199.44%	-68.76%
FREE CASH FLOW
Cash From Operating Activities	$221.0M	$444.0M	$353.0M
Capital Expenditures	-$24.00M	-$33.00M	-$24.00M
Free Cash Flow	$245.0M	$477.0M	$377.0M
YoY Change	-63.65%	26.53%	74.54%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
	cma	Longest Expiration Year Letters Of Credit LongestExpirationYearLettersOfCredit	2028
	dei	Amendment Flag AmendmentFlag	false
	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	Q3
	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2019
	dei	Document Transition Report DocumentTransitionReport	false
	dei	Entity Central Index Key EntityCentralIndexKey	0000028412
	dei	Entity Shell Company EntityShellCompany	false
	us-gaap	Average Term Of Credit Risk Derivatives1 AverageTermOfCreditRiskDerivatives1	P3Y4M24D
CY2018Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	5
CY2018Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	325000000	shares
CY2019Q3	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	325000000	shares
CY2018Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	228164824	shares
CY2019Q3	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	228164824	shares
CY2019Q3	us-gaap	Deferred Tax Assets Operating Loss Carryforwards State And Local DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal	4000000	USD
CY2019Q3	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	3000000	USD
CY2018Q3	us-gaap	Defined Benefit Plan Net Periodic Benefit Cost DefinedBenefitPlanNetPeriodicBenefitCost	-4000000	USD
CY2019Q3	us-gaap	Defined Benefit Plan Net Periodic Benefit Cost DefinedBenefitPlanNetPeriodicBenefitCost	-9000000	USD
CY2018Q3	us-gaap	Gain Loss On Foreign Currency Derivative Instruments Not Designated As Hedging Instruments GainLossOnForeignCurrencyDerivativeInstrumentsNotDesignatedAsHedgingInstruments	0	USD
	us-gaap	Gain Loss On Foreign Currency Derivative Instruments Not Designated As Hedging Instruments GainLossOnForeignCurrencyDerivativeInstrumentsNotDesignatedAsHedgingInstruments	0	USD
	us-gaap	Gain Loss On Foreign Currency Derivative Instruments Not Designated As Hedging Instruments GainLossOnForeignCurrencyDerivativeInstrumentsNotDesignatedAsHedgingInstruments	0	USD
	us-gaap	Interest Expense Deposits InterestExpenseDeposits	192000000	USD
	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
	dei	Entity Registrant Name EntityRegistrantName	Comerica Incorporated
	dei	Entity Incorporation State Country Code EntityIncorporationStateCountryCode	DE
	dei	Entity Tax Identification Number EntityTaxIdentificationNumber	38-1998421
	dei	Entity Interactive Data Current EntityInteractiveDataCurrent	Yes
	dei	Entity Address Address Line1 EntityAddressAddressLine1	1717 Main Street, MC 6404
	dei	Entity Address City Or Town EntityAddressCityOrTown	Dallas
	dei	Entity Address State Or Province EntityAddressStateOrProvince	TX
	dei	Entity Address Postal Zip Code EntityAddressPostalZipCode	75201
	dei	Entity Small Business EntitySmallBusiness	false
	dei	Entity Emerging Growth Company EntityEmergingGrowthCompany	false
CY2019Q3	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	5
	dei	City Area Code CityAreaCode	(214)
	dei	Local Phone Number LocalPhoneNumber	462-6831
	dei	Security12b Title Security12bTitle	Common Stock, $5 par value
CY2019Q3	us-gaap	Lessee Operating Lease Term Of Contract LesseeOperatingLeaseTermOfContract	P9Y0M0D
CY2019Q3	us-gaap	Letters Of Credit Outstanding Amount LettersOfCreditOutstandingAmount	3300000000	USD
CY2018Q4	us-gaap	Mortgage Loans In Process Of Foreclosure Amount MortgageLoansInProcessOfForeclosureAmount	1000000	USD
CY2018Q4	us-gaap	Treasury Stock Shares TreasuryStockShares	68081176	shares
CY2019Q3	us-gaap	Treasury Stock Shares TreasuryStockShares	84028400	shares
	us-gaap	Variable Interest Entity Financial Or Other Support Amount VariableInterestEntityFinancialOrOtherSupportAmount	0	USD
	dei	Trading Symbol TradingSymbol	CMA
	dei	Document Type DocumentType	10-Q
	dei	Document Quarterly Report DocumentQuarterlyReport	true
	dei	Document Period End Date DocumentPeriodEndDate	2019-09-30
	dei	Entity File Number EntityFileNumber	1-10706
	dei	Security Exchange Name SecurityExchangeName	NYSE
	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
CY2018Q4	us-gaap	Interest Bearing Foreign Deposit Time Deposits InterestBearingForeignDepositTimeDeposits	8000000	USD
CY2019Q4	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	144154334	shares
CY2019Q3	us-gaap	Cash And Due From Banks CashAndDueFromBanks	1229000000	USD
CY2018Q4	us-gaap	Cash And Due From Banks CashAndDueFromBanks	1390000000	USD
CY2019Q3	us-gaap	Interest Bearing Deposits In Banks InterestBearingDepositsInBanks	2888000000	USD
CY2018Q4	us-gaap	Interest Bearing Deposits In Banks InterestBearingDepositsInBanks	3171000000	USD
CY2019Q3	us-gaap	Other Short Term Investments OtherShortTermInvestments	146000000	USD
CY2018Q4	us-gaap	Other Short Term Investments OtherShortTermInvestments	134000000	USD
CY2019Q3	us-gaap	Available For Sale Securities AvailableForSaleSecurities	12429000000	USD
CY2018Q4	us-gaap	Available For Sale Securities AvailableForSaleSecurities	12045000000	USD
CY2019Q3	cma	Loans Receivable Commercial Financial And Agricultural Net Of Deferred Income LoansReceivableCommercialFinancialAndAgriculturalNetOfDeferredIncome	32890000000	USD
CY2018Q4	cma	Loans Receivable Commercial Financial And Agricultural Net Of Deferred Income LoansReceivableCommercialFinancialAndAgriculturalNetOfDeferredIncome	31976000000	USD
CY2019Q3	cma	Real Estate Construction Loans Net Of Deferred Income RealEstateConstructionLoansNetOfDeferredIncome	3377000000	USD
CY2018Q4	cma	Real Estate Construction Loans Net Of Deferred Income RealEstateConstructionLoansNetOfDeferredIncome	3077000000	USD
CY2019Q3	cma	Loans Receivable Commercial Mortgage Net Of Deferred Income LoansReceivableCommercialMortgageNetOfDeferredIncome	9234000000	USD
CY2018Q4	cma	Loans Receivable Commercial Mortgage Net Of Deferred Income LoansReceivableCommercialMortgageNetOfDeferredIncome	9106000000	USD
CY2019Q3	cma	Leases Receivable Commercial Lease Financing Net Of Deferred Income LeasesReceivableCommercialLeaseFinancingNetOfDeferredIncome	578000000	USD
CY2018Q4	cma	Leases Receivable Commercial Lease Financing Net Of Deferred Income LeasesReceivableCommercialLeaseFinancingNetOfDeferredIncome	507000000	USD
CY2019Q3	cma	Loans And Leases Receivable Foreign Net Of Deferred Income Other LoansAndLeasesReceivableForeignNetOfDeferredIncomeOther	1055000000	USD
CY2018Q4	cma	Loans And Leases Receivable Foreign Net Of Deferred Income Other LoansAndLeasesReceivableForeignNetOfDeferredIncomeOther	1013000000	USD
CY2019Q3	cma	Loans And Leases Receivable Consumer Mortgage Net Of Deferred Income LoansAndLeasesReceivableConsumerMortgageNetOfDeferredIncome	1906000000	USD
CY2018Q4	cma	Loans And Leases Receivable Consumer Mortgage Net Of Deferred Income LoansAndLeasesReceivableConsumerMortgageNetOfDeferredIncome	1970000000	USD
CY2019Q3	cma	Loans And Leases Receivable Consumer Loans Net Of Deferred Income LoansAndLeasesReceivableConsumerLoansNetOfDeferredIncome	2451000000	USD
CY2018Q4	cma	Loans And Leases Receivable Consumer Loans Net Of Deferred Income LoansAndLeasesReceivableConsumerLoansNetOfDeferredIncome	2514000000	USD
CY2019Q3	us-gaap	Loans And Leases Receivable Net Of Deferred Income LoansAndLeasesReceivableNetOfDeferredIncome	51491000000	USD
CY2018Q4	us-gaap	Loans And Leases Receivable Net Of Deferred Income LoansAndLeasesReceivableNetOfDeferredIncome	50163000000	USD
CY2019Q3	us-gaap	Loans And Leases Receivable Allowance LoansAndLeasesReceivableAllowance	652000000	USD
CY2018Q4	us-gaap	Loans And Leases Receivable Allowance LoansAndLeasesReceivableAllowance	671000000	USD
CY2019Q3	us-gaap	Loans And Leases Receivable Net Reported Amount LoansAndLeasesReceivableNetReportedAmount	50839000000	USD
CY2018Q4	us-gaap	Loans And Leases Receivable Net Reported Amount LoansAndLeasesReceivableNetReportedAmount	49492000000	USD
CY2019Q3	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	467000000	USD
CY2018Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	475000000	USD
CY2019Q3	us-gaap	Other Assets OtherAssets	4850000000	USD
CY2018Q4	us-gaap	Other Assets OtherAssets	4111000000	USD
CY2019Q3	us-gaap	Assets Assets	72848000000	USD
CY2018Q4	us-gaap	Assets Assets	70818000000	USD
CY2019Q3	us-gaap	Noninterest Bearing Deposit Liabilities NoninterestBearingDepositLiabilities	27134000000	USD
CY2018Q4	us-gaap	Noninterest Bearing Deposit Liabilities NoninterestBearingDepositLiabilities	28690000000	USD
CY2019Q3	us-gaap	Deposits Money Market Deposits And Negotiable Order Of Withdrawal Now DepositsMoneyMarketDepositsAndNegotiableOrderOfWithdrawalNOW	23992000000	USD
CY2018Q4	us-gaap	Deposits Money Market Deposits And Negotiable Order Of Withdrawal Now DepositsMoneyMarketDepositsAndNegotiableOrderOfWithdrawalNOW	22560000000	USD
CY2019Q3	us-gaap	Deposits Savings Deposits DepositsSavingsDeposits	2156000000	USD
CY2018Q4	us-gaap	Deposits Savings Deposits DepositsSavingsDeposits	2172000000	USD
CY2019Q3	cma	Deposits Customer Certificates Deposits DepositsCustomerCertificatesDeposits	2853000000	USD
CY2018Q4	cma	Deposits Customer Certificates Deposits DepositsCustomerCertificatesDeposits	2131000000	USD
	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	1915000000	USD
CY2019Q3	cma	Other Time Deposits OtherTimeDeposits	647000000	USD
CY2019Q3	us-gaap	Interest Bearing Deposit Liabilities InterestBearingDepositLiabilities	29675000000	USD
CY2018Q4	cma	Other Time Deposits OtherTimeDeposits	0	USD
CY2019Q3	us-gaap	Interest Bearing Foreign Deposit Time Deposits InterestBearingForeignDepositTimeDeposits	27000000	USD
	cma	Commercial Lending Fees CommercialLendingFees	62000000	USD
CY2019Q3	us-gaap	Foreign Currency Transaction Gain Loss Before Tax ForeignCurrencyTransactionGainLossBeforeTax	11000000	USD
CY2018Q4	us-gaap	Interest Bearing Deposit Liabilities InterestBearingDepositLiabilities	26871000000	USD
CY2019Q3	us-gaap	Deposits Deposits	56809000000	USD
CY2018Q4	us-gaap	Deposits Deposits	55561000000	USD
CY2019Q3	us-gaap	Short Term Borrowings ShortTermBorrowings	51000000	USD
CY2018Q4	us-gaap	Short Term Borrowings ShortTermBorrowings	44000000	USD
CY2019Q3	us-gaap	Other Liabilities OtherLiabilities	1477000000	USD
CY2018Q4	us-gaap	Other Liabilities OtherLiabilities	1243000000	USD
CY2019Q3	us-gaap	Long Term Debt LongTermDebt	7311000000	USD
CY2018Q4	us-gaap	Long Term Debt LongTermDebt	6463000000	USD
CY2019Q3	us-gaap	Liabilities Liabilities	65648000000	USD
CY2018Q4	us-gaap	Liabilities Liabilities	63311000000	USD
CY2019Q3	us-gaap	Common Stock Value CommonStockValue	1141000000	USD
CY2018Q4	us-gaap	Common Stock Value CommonStockValue	1141000000	USD
CY2019Q3	us-gaap	Additional Paid In Capital Common Stock AdditionalPaidInCapitalCommonStock	2172000000	USD
CY2018Q4	us-gaap	Additional Paid In Capital Common Stock AdditionalPaidInCapitalCommonStock	2148000000	USD
CY2019Q3	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-336000000	USD
CY2018Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-609000000	USD
CY2019Q3	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	9369000000	USD
CY2018Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	8781000000	USD
CY2019Q3	us-gaap	Treasury Stock Value TreasuryStockValue	5146000000	USD
CY2018Q4	us-gaap	Treasury Stock Value TreasuryStockValue	3954000000	USD
CY2019Q3	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	7200000000	USD
CY2018Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	7507000000	USD
CY2019Q3	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	72848000000	USD
CY2018Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	70818000000	USD
CY2019Q3	us-gaap	Interest And Fee Income Loans And Leases Held In Portfolio InterestAndFeeIncomeLoansAndLeasesHeldInPortfolio	619000000	USD
CY2018Q3	us-gaap	Interest And Fee Income Loans And Leases Held In Portfolio InterestAndFeeIncomeLoansAndLeasesHeldInPortfolio	581000000	USD
	us-gaap	Interest And Fee Income Loans And Leases Held In Portfolio InterestAndFeeIncomeLoansAndLeasesHeldInPortfolio	1875000000	USD
	us-gaap	Interest And Fee Income Loans And Leases Held In Portfolio InterestAndFeeIncomeLoansAndLeasesHeldInPortfolio	1658000000	USD
CY2019Q3	cma	Interest And Dividend Income Securities Afs And Htm InterestAndDividendIncomeSecuritiesAFSAndHTM	75000000	USD
CY2018Q3	cma	Interest And Dividend Income Securities Afs And Htm InterestAndDividendIncomeSecuritiesAFSAndHTM	66000000	USD
	cma	Interest And Dividend Income Securities Afs And Htm InterestAndDividendIncomeSecuritiesAFSAndHTM	222000000	USD
	cma	Interest And Dividend Income Securities Afs And Htm InterestAndDividendIncomeSecuritiesAFSAndHTM	194000000	USD
CY2019Q3	us-gaap	Other Interest And Dividend Income OtherInterestAndDividendIncome	17000000	USD
CY2018Q3	us-gaap	Other Interest And Dividend Income OtherInterestAndDividendIncome	28000000	USD
	us-gaap	Other Interest And Dividend Income OtherInterestAndDividendIncome	51000000	USD
	us-gaap	Other Interest And Dividend Income OtherInterestAndDividendIncome	63000000	USD
CY2019Q3	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	711000000	USD
CY2018Q3	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	675000000	USD
	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	2148000000	USD
CY2019Q3	us-gaap	Interest Expense Deposits InterestExpenseDeposits	73000000	USD
CY2018Q3	us-gaap	Interest Expense Deposits InterestExpenseDeposits	35000000	USD
	us-gaap	Interest Expense Deposits InterestExpenseDeposits	79000000	USD
CY2019Q3	us-gaap	Interest Expense Short Term Borrowings InterestExpenseShortTermBorrowings	2000000	USD
CY2018Q3	us-gaap	Interest Expense Short Term Borrowings InterestExpenseShortTermBorrowings	1000000	USD
	us-gaap	Interest Expense Short Term Borrowings InterestExpenseShortTermBorrowings	9000000	USD
	us-gaap	Interest Expense Short Term Borrowings InterestExpenseShortTermBorrowings	1000000	USD
CY2019Q3	us-gaap	Interest Expense Long Term Debt InterestExpenseLongTermDebt	50000000	USD
CY2018Q3	us-gaap	Interest Expense Long Term Debt InterestExpenseLongTermDebt	40000000	USD
	us-gaap	Interest Expense Long Term Debt InterestExpenseLongTermDebt	152000000	USD
	us-gaap	Interest Expense Long Term Debt InterestExpenseLongTermDebt	97000000	USD
CY2019Q3	us-gaap	Interest Expense InterestExpense	125000000	USD
CY2018Q3	us-gaap	Interest Expense InterestExpense	76000000	USD
	us-gaap	Interest Expense InterestExpense	353000000	USD
	us-gaap	Interest Expense InterestExpense	177000000	USD
CY2019Q3	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	586000000	USD
CY2018Q3	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	599000000	USD
	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	1795000000	USD
	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	1738000000	USD
CY2019Q3	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	35000000	USD
CY2018Q3	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	0	USD
	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	66000000	USD
	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	-17000000	USD
CY2019Q3	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	551000000	USD
CY2018Q3	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	599000000	USD
	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	1729000000	USD
	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	1755000000	USD
CY2019Q3	cma	Card Fees CardFees	67000000	USD
CY2018Q3	cma	Card Fees CardFees	61000000	USD
	cma	Card Fees CardFees	195000000	USD
	cma	Card Fees CardFees	180000000	USD
CY2019Q3	cma	Servicechargesondepositaccounts Servicechargesondepositaccounts	51000000	USD
CY2018Q3	cma	Servicechargesondepositaccounts Servicechargesondepositaccounts	53000000	USD
	cma	Servicechargesondepositaccounts Servicechargesondepositaccounts	153000000	USD
	cma	Servicechargesondepositaccounts Servicechargesondepositaccounts	160000000	USD
CY2019Q3	cma	Fiduciaryincome Fiduciaryincome	53000000	USD
CY2018Q3	cma	Fiduciaryincome Fiduciaryincome	51000000	USD
	cma	Fiduciaryincome Fiduciaryincome	154000000	USD
	cma	Fiduciaryincome Fiduciaryincome	155000000	USD
CY2019Q3	cma	Commercial Lending Fees CommercialLendingFees	23000000	USD
CY2018Q3	us-gaap	Foreign Currency Transaction Gain Loss Before Tax ForeignCurrencyTransactionGainLossBeforeTax	12000000	USD
CY2018Q3	cma	Commercial Lending Fees CommercialLendingFees	21000000	USD
	cma	Commercial Lending Fees CommercialLendingFees	66000000	USD
	us-gaap	Foreign Currency Transaction Gain Loss Before Tax ForeignCurrencyTransactionGainLossBeforeTax	33000000	USD
	us-gaap	Foreign Currency Transaction Gain Loss Before Tax ForeignCurrencyTransactionGainLossBeforeTax	36000000	USD
CY2019Q3	cma	Letter Of Credit Fees LetterOfCreditFees	10000000	USD
CY2018Q3	cma	Letter Of Credit Fees LetterOfCreditFees	9000000	USD
	cma	Letter Of Credit Fees LetterOfCreditFees	29000000	USD
	cma	Letter Of Credit Fees LetterOfCreditFees	30000000	USD
CY2019Q3	us-gaap	Bank Owned Life Insurance Income BankOwnedLifeInsuranceIncome	11000000	USD
CY2018Q3	us-gaap	Bank Owned Life Insurance Income BankOwnedLifeInsuranceIncome	11000000	USD
	us-gaap	Bank Owned Life Insurance Income BankOwnedLifeInsuranceIncome	31000000	USD
	us-gaap	Bank Owned Life Insurance Income BankOwnedLifeInsuranceIncome	29000000	USD
CY2019Q3	us-gaap	Brokerage Commissions Revenue BrokerageCommissionsRevenue	7000000	USD
CY2018Q3	us-gaap	Brokerage Commissions Revenue BrokerageCommissionsRevenue	7000000	USD
	us-gaap	Brokerage Commissions Revenue BrokerageCommissionsRevenue	21000000	USD
	us-gaap	Brokerage Commissions Revenue BrokerageCommissionsRevenue	20000000	USD
CY2019Q3	us-gaap	Debt And Equity Securities Gain Loss DebtAndEquitySecuritiesGainLoss	0	USD
CY2018Q3	us-gaap	Debt And Equity Securities Gain Loss DebtAndEquitySecuritiesGainLoss	-20000000	USD
	us-gaap	Debt And Equity Securities Gain Loss DebtAndEquitySecuritiesGainLoss	-8000000	USD
	us-gaap	Debt And Equity Securities Gain Loss DebtAndEquitySecuritiesGainLoss	-19000000	USD
CY2019Q3	us-gaap	Noninterest Income Other Operating Income NoninterestIncomeOtherOperatingIncome	23000000	USD
CY2018Q3	us-gaap	Noninterest Income Other Operating Income NoninterestIncomeOtherOperatingIncome	29000000	USD
	us-gaap	Noninterest Income Other Operating Income NoninterestIncomeOtherOperatingIncome	70000000	USD
	us-gaap	Noninterest Income Other Operating Income NoninterestIncomeOtherOperatingIncome	73000000	USD
CY2019Q3	us-gaap	Noninterest Income NoninterestIncome	256000000	USD
CY2018Q3	us-gaap	Noninterest Income NoninterestIncome	234000000	USD
	us-gaap	Noninterest Income NoninterestIncome	744000000	USD
	us-gaap	Noninterest Income NoninterestIncome	726000000	USD
CY2019Q3	us-gaap	Labor And Related Expense LaborAndRelatedExpense	253000000	USD
CY2018Q3	us-gaap	Labor And Related Expense LaborAndRelatedExpense	254000000	USD
	us-gaap	Labor And Related Expense LaborAndRelatedExpense	763000000	USD
	us-gaap	Labor And Related Expense LaborAndRelatedExpense	759000000	USD
CY2019Q3	cma	Outside Processing Fee Expense OutsideProcessingFeeExpense	66000000	USD
CY2018Q3	cma	Outside Processing Fee Expense OutsideProcessingFeeExpense	65000000	USD
	cma	Outside Processing Fee Expense OutsideProcessingFeeExpense	194000000	USD
	cma	Outside Processing Fee Expense OutsideProcessingFeeExpense	190000000	USD
CY2019Q3	us-gaap	Occupancy Net OccupancyNet	39000000	USD
CY2018Q3	us-gaap	Occupancy Net OccupancyNet	38000000	USD
	us-gaap	Occupancy Net OccupancyNet	113000000	USD
	us-gaap	Occupancy Net OccupancyNet	113000000	USD
CY2019Q3	cma	Software Expenses SoftwareExpenses	30000000	USD
CY2018Q3	cma	Software Expenses SoftwareExpenses	32000000	USD
	cma	Software Expenses SoftwareExpenses	87000000	USD
CY2018Q3	us-gaap	Equipment Expense EquipmentExpense	12000000	USD
	cma	Software Expenses SoftwareExpenses	95000000	USD
CY2019Q3	us-gaap	Equipment Expense EquipmentExpense	13000000	USD
	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	924000000	USD
	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	919000000	USD
CY2019Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.98
CY2018Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.89
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	6.08
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	5.41
	us-gaap	Equipment Expense EquipmentExpense	37000000	USD
	us-gaap	Equipment Expense EquipmentExpense	34000000	USD
CY2019Q3	us-gaap	Federal Deposit Insurance Corporation Premium Expense FederalDepositInsuranceCorporationPremiumExpense	6000000	USD
CY2018Q3	us-gaap	Federal Deposit Insurance Corporation Premium Expense FederalDepositInsuranceCorporationPremiumExpense	11000000	USD
	us-gaap	Federal Deposit Insurance Corporation Premium Expense FederalDepositInsuranceCorporationPremiumExpense	17000000	USD
	us-gaap	Federal Deposit Insurance Corporation Premium Expense FederalDepositInsuranceCorporationPremiumExpense	36000000	USD
CY2019Q3	us-gaap	Advertising Expense AdvertisingExpense	10000000	USD
CY2018Q3	us-gaap	Advertising Expense AdvertisingExpense	8000000	USD
	us-gaap	Advertising Expense AdvertisingExpense	24000000	USD
	us-gaap	Advertising Expense AdvertisingExpense	22000000	USD
CY2019Q3	us-gaap	Restructuring Charges RestructuringCharges	0	USD
CY2018Q3	us-gaap	Restructuring Charges RestructuringCharges	12000000	USD
	us-gaap	Restructuring Charges RestructuringCharges	0	USD
	us-gaap	Restructuring Charges RestructuringCharges	39000000	USD
CY2019Q3	us-gaap	Other Noninterest Expense OtherNoninterestExpense	18000000	USD
CY2018Q3	us-gaap	Other Noninterest Expense OtherNoninterestExpense	20000000	USD
	us-gaap	Other Noninterest Expense OtherNoninterestExpense	57000000	USD
	us-gaap	Other Noninterest Expense OtherNoninterestExpense	58000000	USD
CY2019Q3	us-gaap	Noninterest Expense NoninterestExpense	435000000	USD
CY2018Q3	us-gaap	Noninterest Expense NoninterestExpense	452000000	USD
	us-gaap	Noninterest Expense NoninterestExpense	1292000000	USD
	us-gaap	Noninterest Expense NoninterestExpense	1346000000	USD
CY2019Q3	cma	Income Loss From Continuing Operations Before Income Taxes IncomeLossFromContinuingOperationsBeforeIncomeTaxes	372000000	USD
CY2018Q3	cma	Income Loss From Continuing Operations Before Income Taxes IncomeLossFromContinuingOperationsBeforeIncomeTaxes	381000000	USD
	cma	Income Loss From Continuing Operations Before Income Taxes IncomeLossFromContinuingOperationsBeforeIncomeTaxes	1181000000	USD
	cma	Income Loss From Continuing Operations Before Income Taxes IncomeLossFromContinuingOperationsBeforeIncomeTaxes	1135000000	USD
CY2019Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	80000000	USD
CY2018Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	63000000	USD
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	252000000	USD
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	210000000	USD
CY2019Q3	us-gaap	Profit Loss ProfitLoss	292000000	USD
CY2018Q3	us-gaap	Profit Loss ProfitLoss	318000000	USD
	us-gaap	Profit Loss ProfitLoss	929000000	USD
	us-gaap	Profit Loss ProfitLoss	925000000	USD
CY2019Q3	us-gaap	Undistributed Earnings Loss Allocated To Participating Securities Diluted UndistributedEarningsLossAllocatedToParticipatingSecuritiesDiluted	2000000	USD
CY2018Q3	us-gaap	Undistributed Earnings Loss Allocated To Participating Securities Diluted UndistributedEarningsLossAllocatedToParticipatingSecuritiesDiluted	2000000	USD
	us-gaap	Undistributed Earnings Loss Allocated To Participating Securities Diluted UndistributedEarningsLossAllocatedToParticipatingSecuritiesDiluted	5000000	USD
	us-gaap	Undistributed Earnings Loss Allocated To Participating Securities Diluted UndistributedEarningsLossAllocatedToParticipatingSecuritiesDiluted	6000000	USD
CY2019Q3	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	290000000	USD
CY2018Q3	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	316000000	USD
CY2018Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.86
CY2018Q3	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	7786000000	USD
CY2019Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.96
CY2018Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	7507000000	USD
CY2018Q4	us-gaap	New Accounting Pronouncement Or Change In Accounting Principle Cumulative Effect Of Change On Equity Or Net Assets1 NewAccountingPronouncementOrChangeInAccountingPrincipleCumulativeEffectOfChangeOnEquityOrNetAssets1	-14000000	USD
	us-gaap	Profit Loss ProfitLoss	929000000	USD
	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	273000000	USD
	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	302000000	USD
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	6.02
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	5.32
CY2019Q3	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	338000000	USD
CY2018Q3	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	296000000	USD
	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	1202000000	USD
	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	764000000	USD
CY2019Q3	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	97000000	USD
CY2018Q3	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	100000000	USD
	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	302000000	USD
	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	210000000	USD
CY2019Q3	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.67
CY2018Q3	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.60
	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	2.01
	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	1.24
CY2018Q2	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	8079000000	USD
CY2018Q3	us-gaap	Profit Loss ProfitLoss	318000000	USD
CY2018Q3	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-22000000	USD
CY2018Q3	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	100000000	USD
CY2018Q3	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	500000000	USD
CY2018Q3	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	-4000000	USD
CY2018Q3	cma	Stock Issued During Period Value Warrants Exercised StockIssuedDuringPeriodValueWarrantsExercised	0	USD
CY2018Q3	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	7000000	USD
CY2018Q3	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	7786000000	USD
CY2019Q2	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	7323000000	USD
CY2019Q3	us-gaap	Profit Loss ProfitLoss	292000000	USD
CY2019Q3	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	46000000	USD
CY2019Q3	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	97000000	USD
CY2019Q3	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	370000000	USD
CY2019Q3	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	-1000000	USD
CY2019Q3	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	5000000	USD
CY2019Q3	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	7200000000	USD
CY2017Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	7963000000	USD
CY2017Q4	us-gaap	New Accounting Pronouncement Or Change In Accounting Principle Cumulative Effect Of Change On Equity Or Net Assets1 NewAccountingPronouncementOrChangeInAccountingPrincipleCumulativeEffectOfChangeOnEquityOrNetAssets1	15000000	USD
	us-gaap	Profit Loss ProfitLoss	925000000	USD
	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-161000000	USD
	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	210000000	USD
	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	828000000	USD
	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	-41000000	USD
	cma	Stock Issued During Period Value Warrants Exercised StockIssuedDuringPeriodValueWarrantsExercised	0	USD
	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	41000000	USD
	us-gaap	Proceeds From Life Insurance Policies ProceedsFromLifeInsurancePolicies	7000000	USD
	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	1229000000	USD
	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	1000000	USD
	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	37000000	USD
	us-gaap	Payments To Acquire Federal Home Loan Bank Stock PaymentsToAcquireFederalHomeLoanBankStock	201000000	USD
	us-gaap	Payments To Acquire Federal Home Loan Bank Stock PaymentsToAcquireFederalHomeLoanBankStock	41000000	USD
CY2019Q3	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	7200000000	USD
	us-gaap	Profit Loss ProfitLoss	929000000	USD
	us-gaap	Profit Loss ProfitLoss	925000000	USD
	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	66000000	USD
	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	-17000000	USD
	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	4000000	USD
	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	37000000	USD
	us-gaap	Depreciation And Amortization DepreciationAndAmortization	84000000	USD
	us-gaap	Depreciation And Amortization DepreciationAndAmortization	90000000	USD
	us-gaap	Defined Benefit Plan Net Periodic Benefit Cost DefinedBenefitPlanNetPeriodicBenefitCost	-23000000	USD
	us-gaap	Defined Benefit Plan Net Periodic Benefit Cost DefinedBenefitPlanNetPeriodicBenefitCost	-14000000	USD
	us-gaap	Share Based Compensation ShareBasedCompensation	37000000	USD
	us-gaap	Share Based Compensation ShareBasedCompensation	41000000	USD
	us-gaap	Accretion Amortization Of Discounts And Premiums Investments AccretionAmortizationOfDiscountsAndPremiumsInvestments	-2000000	USD
	us-gaap	Accretion Amortization Of Discounts And Premiums Investments AccretionAmortizationOfDiscountsAndPremiumsInvestments	-3000000	USD
	cma	Accretion Of Discount On Receivables Acquired In Transfer AccretionOfDiscountOnReceivablesAcquiredInTransfer	0	USD
	cma	Accretion Of Discount On Receivables Acquired In Transfer AccretionOfDiscountOnReceivablesAcquiredInTransfer	1000000	USD
	us-gaap	Debt And Equity Securities Gain Loss DebtAndEquitySecuritiesGainLoss	-8000000	USD
	us-gaap	Debt And Equity Securities Gain Loss DebtAndEquitySecuritiesGainLoss	-19000000	USD
	us-gaap	Gain Loss On Sale Of Other Assets GainLossOnSaleOfOtherAssets	0	USD
	us-gaap	Gain Loss On Sale Of Other Assets GainLossOnSaleOfOtherAssets	1000000	USD
	us-gaap	Increase Decrease In Interest And Dividends Receivable IncreaseDecreaseInInterestAndDividendsReceivable	-1000000	USD
	us-gaap	Increase Decrease In Interest And Dividends Receivable IncreaseDecreaseInInterestAndDividendsReceivable	36000000	USD
	us-gaap	Increase Decrease In Accrued Liabilities IncreaseDecreaseInAccruedLiabilities	-39000000	USD
	us-gaap	Increase Decrease In Accrued Liabilities IncreaseDecreaseInAccruedLiabilities	19000000	USD
	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	200000000	USD
	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	98000000	USD
	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	869000000	USD
	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	967000000	USD
	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	1615000000	USD
	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	1366000000	USD
	us-gaap	Proceeds From Sale Of Available For Sale Securities ProceedsFromSaleOfAvailableForSaleSecurities	987000000	USD
	us-gaap	Proceeds From Sale Of Available For Sale Securities ProceedsFromSaleOfAvailableForSaleSecurities	1256000000	USD
	us-gaap	Payments To Acquire Available For Sale Securities PaymentsToAcquireAvailableForSaleSecurities	2721000000	USD
	us-gaap	Payments To Acquire Available For Sale Securities PaymentsToAcquireAvailableForSaleSecurities	2618000000	USD
	us-gaap	Payments For Proceeds From Loans And Leases PaymentsForProceedsFromLoansAndLeases	1419000000	USD
	us-gaap	Payments For Proceeds From Loans And Leases PaymentsForProceedsFromLoansAndLeases	-120000000	USD
	us-gaap	Proceeds From Sale Of Foreclosed Assets ProceedsFromSaleOfForeclosedAssets	1000000	USD
	us-gaap	Proceeds From Sale Of Foreclosed Assets ProceedsFromSaleOfForeclosedAssets	7000000	USD
	cma	Net Increase In Fixed Assets NetIncreaseInFixedAssets	62000000	USD
	cma	Net Increase In Fixed Assets NetIncreaseInFixedAssets	65000000	USD
	us-gaap	Proceeds From Sale Of Federal Home Loan Bank Stock ProceedsFromSaleOfFederalHomeLoanBankStock	201000000	USD
	us-gaap	Proceeds From Sale Of Federal Home Loan Bank Stock ProceedsFromSaleOfFederalHomeLoanBankStock	0	USD
CY2019Q3	cma	Total Nonperforming Loans TotalNonperformingLoans	226000000	USD
CY2018Q4	cma	Total Nonperforming Loans TotalNonperformingLoans	229000000	USD
	us-gaap	Proceeds From Life Insurance Policies ProceedsFromLifeInsurancePolicies	4000000	USD
	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	2000000	USD
	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	-2000000	USD
	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-1590000000	USD
	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	27000000	USD
	us-gaap	Increase Decrease In Deposits IncreaseDecreaseInDeposits	1105000000	USD
	us-gaap	Increase Decrease In Deposits IncreaseDecreaseInDeposits	-1978000000	USD
	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	7000000	USD
	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	74000000	USD
	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	350000000	USD
	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	0	USD
	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	1050000000	USD
	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	1850000000	USD
	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	1242000000	USD
	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	837000000	USD
	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	303000000	USD
	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	161000000	USD
	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	12000000	USD
	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	50000000	USD
	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-2000000	USD
	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	2000000	USD
	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	277000000	USD
	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-1000000000	USD
	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	-444000000	USD
	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	-6000000	USD
CY2018Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	4561000000	USD
CY2017Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	5845000000	USD
CY2019Q3	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	4117000000	USD
CY2018Q3	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	5839000000	USD
	us-gaap	Interest Paid InterestPaid	347000000	USD
	us-gaap	Interest Paid InterestPaid	172000000	USD
	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	221000000	USD
	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	125000000	USD
	us-gaap	Transfer To Other Real Estate TransferToOtherRealEstate	3000000	USD
	us-gaap	Transfer To Other Real Estate TransferToOtherRealEstate	2000000	USD
	us-gaap	Debt Securities Held To Maturity Transfer Amount DebtSecuritiesHeldToMaturityTransferAmount	0	USD
	us-gaap	Debt Securities Held To Maturity Transfer Amount DebtSecuritiesHeldToMaturityTransferAmount	1266000000	USD
CY2019Q3	cma	Availableforsalesecuritiesreclassifiedtoequitysecurities Availableforsalesecuritiesreclassifiedtoequitysecurities	0	USD
CY2018Q3	cma	Availableforsalesecuritiesreclassifiedtoequitysecurities Availableforsalesecuritiesreclassifiedtoequitysecurities	81000000	USD
CY2019Q3	us-gaap	Available For Sale Securities Amortized Cost AvailableForSaleSecuritiesAmortizedCost	12334000000	USD
CY2019Q3	us-gaap	Available For Sale Securities Accumulated Gross Unrealized Gain Before Tax AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax	126000000	USD
CY2019Q3	us-gaap	Available For Sale Securities Accumulated Gross Unrealized Loss Before Tax AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax	31000000	USD
CY2019Q3	us-gaap	Available For Sale Securities AvailableForSaleSecurities	12429000000	USD
CY2018Q4	us-gaap	Available For Sale Securities Amortized Cost AvailableForSaleSecuritiesAmortizedCost	12225000000	USD
CY2018Q4	us-gaap	Available For Sale Securities Accumulated Gross Unrealized Gain Before Tax AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax	36000000	USD
CY2018Q4	us-gaap	Available For Sale Securities Accumulated Gross Unrealized Loss Before Tax AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax	216000000	USD
CY2018Q4	us-gaap	Available For Sale Securities AvailableForSaleSecurities	12045000000	USD
CY2019Q3	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Less Than Twelve Months Fair Value AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue	1412000000	USD
CY2019Q3	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Less Than12 Months Accumulated Loss AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss	4000000	USD
CY2019Q3	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or Longer Fair Value AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue	2130000000	USD
CY2019Q3	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position12 Months Or Longer Accumulated Loss AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss	27000000	USD
CY2019Q3	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Fair Value AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue	3542000000	USD
CY2019Q3	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Accumulated Loss AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLoss	31000000	USD
CY2018Q4	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Less Than Twelve Months Fair Value AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue	1008000000	USD
CY2018Q4	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Less Than12 Months Accumulated Loss AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss	9000000	USD
CY2018Q4	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or Longer Fair Value AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue	7869000000	USD
CY2018Q4	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position12 Months Or Longer Accumulated Loss AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss	207000000	USD
CY2018Q4	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Fair Value AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue	8877000000	USD
CY2018Q4	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Accumulated Loss AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLoss	216000000	USD
CY2019Q3	us-gaap	Foreclosed Assets ForeclosedAssets	3000000	USD
CY2018Q4	us-gaap	Derivative Collateral Obligation To Return Securities DerivativeCollateralObligationToReturnSecurities	1000000	USD
CY2019Q3	us-gaap	Debt Securities Available For Sale Restricted DebtSecuritiesAvailableForSaleRestricted	375000000	USD
CY2019Q3	cma	Liabilities Secured By Pledged Securities LiabilitiesSecuredByPledgedSecurities	270000000	USD
CY2019Q3	us-gaap	Financing Receivable Recorded Investment Past Due FinancingReceivableRecordedInvestmentPastDue	169000000	USD
CY2019Q3	us-gaap	Loans And Leases Receivable Impaired Nonperforming Nonaccrual Of Interest LoansAndLeasesReceivableImpairedNonperformingNonaccrualOfInterest	220000000	USD
CY2019Q3	us-gaap	Financing Receivable Recorded Investment Current FinancingReceivableRecordedInvestmentCurrent	51102000000	USD
CY2019Q3	us-gaap	Loans And Leases Receivable Net Of Deferred Income LoansAndLeasesReceivableNetOfDeferredIncome	51491000000	USD
CY2018Q4	us-gaap	Financing Receivable Recorded Investment Past Due FinancingReceivableRecordedInvestmentPastDue	149000000	USD
CY2018Q4	us-gaap	Loans And Leases Receivable Impaired Nonperforming Nonaccrual Of Interest LoansAndLeasesReceivableImpairedNonperformingNonaccrualOfInterest	221000000	USD
CY2018Q4	us-gaap	Financing Receivable Recorded Investment Current FinancingReceivableRecordedInvestmentCurrent	49793000000	USD
CY2018Q4	us-gaap	Loans And Leases Receivable Net Of Deferred Income LoansAndLeasesReceivableNetOfDeferredIncome	50163000000	USD
CY2019Q3	us-gaap	Loans And Leases Receivable Net Of Deferred Income LoansAndLeasesReceivableNetOfDeferredIncome	51491000000	USD
CY2018Q4	us-gaap	Loans And Leases Receivable Net Of Deferred Income LoansAndLeasesReceivableNetOfDeferredIncome	50163000000	USD
CY2019Q3	us-gaap	Loans And Leases Receivable Impaired Nonperforming Nonaccrual Of Interest LoansAndLeasesReceivableImpairedNonperformingNonaccrualOfInterest	220000000	USD
CY2018Q4	us-gaap	Loans And Leases Receivable Impaired Nonperforming Nonaccrual Of Interest LoansAndLeasesReceivableImpairedNonperformingNonaccrualOfInterest	221000000	USD
CY2019Q3	cma	Reduced Rate Loans ReducedRateLoans	6000000	USD
CY2018Q4	cma	Reduced Rate Loans ReducedRateLoans	8000000	USD
CY2018Q4	us-gaap	Foreclosed Assets ForeclosedAssets	1000000	USD
CY2019Q3	cma	Total Nonperforming Assets TotalNonperformingAssets	229000000	USD
CY2018Q4	cma	Total Nonperforming Assets TotalNonperformingAssets	230000000	USD
CY2019Q3	us-gaap	Mortgage Loans In Process Of Foreclosure Amount MortgageLoansInProcessOfForeclosureAmount	0	USD
CY2019Q3	us-gaap	Impaired Financing Receivable With No Related Allowance Recorded Investment ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment	80000000	USD
CY2019Q3	us-gaap	Impaired Financing Receivable With Related Allowance Recorded Investment ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment	163000000	USD
CY2019Q3	us-gaap	Impaired Financing Receivable Recorded Investment ImpairedFinancingReceivableRecordedInvestment	243000000	USD
CY2019Q3	us-gaap	Impaired Financing Receivable Unpaid Principal Balance ImpairedFinancingReceivableUnpaidPrincipalBalance	364000000	USD
CY2019Q3	us-gaap	Impaired Financing Receivable Related Allowance ImpairedFinancingReceivableRelatedAllowance	34000000	USD
CY2018Q4	us-gaap	Impaired Financing Receivable With No Related Allowance Recorded Investment ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment	121000000	USD
CY2018Q4	us-gaap	Impaired Financing Receivable With Related Allowance Recorded Investment ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment	155000000	USD
CY2018Q4	us-gaap	Impaired Financing Receivable Recorded Investment ImpairedFinancingReceivableRecordedInvestment	276000000	USD
CY2018Q4	us-gaap	Impaired Financing Receivable Unpaid Principal Balance ImpairedFinancingReceivableUnpaidPrincipalBalance	346000000	USD
CY2018Q4	us-gaap	Impaired Financing Receivable Related Allowance ImpairedFinancingReceivableRelatedAllowance	27000000	USD
CY2019Q3	us-gaap	Impaired Financing Receivable Average Recorded Investment ImpairedFinancingReceivableAverageRecordedInvestment	241000000	USD
CY2019Q3	us-gaap	Impaired Financing Receivable Interest Income Accrual Method ImpairedFinancingReceivableInterestIncomeAccrualMethod	3000000	USD
CY2018Q3	us-gaap	Impaired Financing Receivable Average Recorded Investment ImpairedFinancingReceivableAverageRecordedInvestment	322000000	USD
CY2018Q3	us-gaap	Impaired Financing Receivable Interest Income Accrual Method ImpairedFinancingReceivableInterestIncomeAccrualMethod	3000000	USD
	us-gaap	Impaired Financing Receivable Average Recorded Investment ImpairedFinancingReceivableAverageRecordedInvestment	249000000	USD
	us-gaap	Impaired Financing Receivable Interest Income Accrual Method ImpairedFinancingReceivableInterestIncomeAccrualMethod	6000000	USD
	us-gaap	Impaired Financing Receivable Average Recorded Investment ImpairedFinancingReceivableAverageRecordedInvestment	383000000	USD
	us-gaap	Impaired Financing Receivable Interest Income Accrual Method ImpairedFinancingReceivableInterestIncomeAccrualMethod	7000000	USD
CY2019Q3	us-gaap	Financing Receivable Modifications Post Modification Recorded Investment2 FinancingReceivableModificationsPostModificationRecordedInvestment2	11000000	USD
CY2018Q3	us-gaap	Financing Receivable Modifications Post Modification Recorded Investment2 FinancingReceivableModificationsPostModificationRecordedInvestment2	5000000	USD
	us-gaap	Financing Receivable Modifications Post Modification Recorded Investment2 FinancingReceivableModificationsPostModificationRecordedInvestment2	20000000	USD
	us-gaap	Financing Receivable Modifications Post Modification Recorded Investment2 FinancingReceivableModificationsPostModificationRecordedInvestment2	39000000	USD
CY2019Q3	us-gaap	Loans And Leases Receivable Impaired Commitment To Lend LoansAndLeasesReceivableImpairedCommitmentToLend	2000000	USD
CY2018Q4	us-gaap	Loans And Leases Receivable Impaired Commitment To Lend LoansAndLeasesReceivableImpairedCommitmentToLend	20000000	USD
CY2019Q3	us-gaap	Derivative Collateral Obligation To Return Securities DerivativeCollateralObligationToReturnSecurities	1000000	USD
CY2019Q3	us-gaap	Derivative Collateral Right To Reclaim Securities DerivativeCollateralRightToReclaimSecurities	26000000	USD
CY2018Q4	us-gaap	Derivative Collateral Right To Reclaim Securities DerivativeCollateralRightToReclaimSecurities	0	USD
CY2019Q3	us-gaap	Derivative Liability Fair Value Of Collateral DerivativeLiabilityFairValueOfCollateral	1000000	USD
CY2019Q3	cma	Derivative Assets Cash Collateral DerivativeAssetsCashCollateral	102000000	USD
CY2019Q3	us-gaap	Derivative Asset Fair Value Of Collateral DerivativeAssetFairValueOfCollateral	27000000	USD
CY2019Q3	cma	Cash Collateral Posted For Derivatives In Liability Position CashCollateralPostedForDerivativesInLiabilityPosition	13000000	USD
CY2019Q3	us-gaap	Derivative Net Liability Position Aggregate Fair Value DerivativeNetLiabilityPositionAggregateFairValue	0	USD
CY2019Q3	invest	Derivative Notional Amount DerivativeNotionalAmount	29089000000	USD
CY2019Q3	us-gaap	Derivative Fair Value Of Derivative Asset DerivativeFairValueOfDerivativeAsset	448000000	USD
CY2019Q3	us-gaap	Derivative Fair Value Of Derivative Liability DerivativeFairValueOfDerivativeLiability	209000000	USD
CY2018Q4	invest	Derivative Notional Amount DerivativeNotionalAmount	21557000000	USD
CY2018Q4	us-gaap	Derivative Fair Value Of Derivative Asset DerivativeFairValueOfDerivativeAsset	275000000	USD
CY2018Q4	us-gaap	Derivative Fair Value Of Derivative Liability DerivativeFairValueOfDerivativeLiability	269000000	USD
CY2019Q3	us-gaap	Derivative Asset Fair Value Gross Liability DerivativeAssetFairValueGrossLiability	45000000	USD
CY2019Q3	us-gaap	Derivative Liability Fair Value Gross Asset DerivativeLiabilityFairValueGrossAsset	45000000	USD
CY2018Q4	us-gaap	Derivative Asset Fair Value Gross Liability DerivativeAssetFairValueGrossLiability	45000000	USD
CY2018Q4	us-gaap	Derivative Liability Fair Value Gross Asset DerivativeLiabilityFairValueGrossAsset	45000000	USD
CY2019Q3	us-gaap	Derivative Asset Collateral Obligation To Return Cash Offset DerivativeAssetCollateralObligationToReturnCashOffset	101000000	USD
CY2019Q3	us-gaap	Derivative Liability Collateral Right To Reclaim Cash Offset DerivativeLiabilityCollateralRightToReclaimCashOffset	12000000	USD
CY2018Q4	us-gaap	Derivative Asset Collateral Obligation To Return Cash Offset DerivativeAssetCollateralObligationToReturnCashOffset	174000000	USD
CY2018Q4	us-gaap	Derivative Liability Collateral Right To Reclaim Cash Offset DerivativeLiabilityCollateralRightToReclaimCashOffset	1000000	USD
CY2019Q3	us-gaap	Derivative Assets DerivativeAssets	302000000	USD
CY2019Q3	us-gaap	Derivative Liabilities DerivativeLiabilities	152000000	USD
CY2018Q4	us-gaap	Derivative Assets DerivativeAssets	56000000	USD
CY2018Q4	us-gaap	Derivative Liabilities DerivativeLiabilities	223000000	USD
	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax	0	USD
	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci On Derivatives Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesBeforeTax	-1000000	USD
CY2019Q3	us-gaap	Derivative Fair Value Of Derivative Asset Amount Offset Against Collateral DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCollateral	301000000	USD
CY2019Q3	us-gaap	Derivative Fair Value Of Derivative Liability Amount Offset Against Collateral DerivativeFairValueOfDerivativeLiabilityAmountOffsetAgainstCollateral	126000000	USD
CY2018Q4	us-gaap	Derivative Fair Value Of Derivative Asset Amount Offset Against Collateral DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCollateral	55000000	USD
CY2018Q4	us-gaap	Derivative Fair Value Of Derivative Liability Amount Offset Against Collateral DerivativeFairValueOfDerivativeLiabilityAmountOffsetAgainstCollateral	223000000	USD
CY2019Q3	us-gaap	Derivative Credit Risk Valuation Adjustment Derivative Assets DerivativeCreditRiskValuationAdjustmentDerivativeAssets	12000000	USD
CY2018Q4	us-gaap	Derivative Credit Risk Valuation Adjustment Derivative Assets DerivativeCreditRiskValuationAdjustmentDerivativeAssets	2000000	USD
CY2019Q3	us-gaap	Interest Expense Long Term Debt InterestExpenseLongTermDebt	50000000	USD
CY2018Q3	us-gaap	Interest Expense Long Term Debt InterestExpenseLongTermDebt	40000000	USD
	us-gaap	Interest Expense Long Term Debt InterestExpenseLongTermDebt	152000000	USD
	us-gaap	Interest Expense Long Term Debt InterestExpenseLongTermDebt	97000000	USD
CY2019Q3	cma	Cumulative Hedging Adjustmentson Derivative Swap CumulativeHedgingAdjustmentsonDerivativeSwap	189000000	USD
CY2018Q4	cma	Cumulative Hedging Adjustmentson Derivative Swap CumulativeHedgingAdjustmentsonDerivativeSwap	49000000	USD
CY2019Q3	cma	Cumulative Hedging Adjustmentona Discontinued Cash Flow Hedge CumulativeHedgingAdjustmentonaDiscontinuedCashFlowHedge	7000000	USD
CY2018Q4	cma	Cumulative Hedging Adjustmentona Discontinued Cash Flow Hedge CumulativeHedgingAdjustmentonaDiscontinuedCashFlowHedge	8000000	USD
CY2019Q3	us-gaap	Gain Loss On Foreign Currency Derivative Instruments Not Designated As Hedging Instruments GainLossOnForeignCurrencyDerivativeInstrumentsNotDesignatedAsHedgingInstruments	0	USD
CY2018Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.89
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	6.08
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	5.41
CY2019Q3	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	147000000	shares
CY2019Q3	cma	Allowance For Off Balance Sheet Credit Losses AllowanceForOffBalanceSheetCreditLosses	29000000	USD
CY2018Q4	cma	Allowance For Off Balance Sheet Credit Losses AllowanceForOffBalanceSheetCreditLosses	30000000	USD
CY2019Q3	cma	Carrying Value Of Unused Commitments To Extend Credit CarryingValueOfUnusedCommitmentsToExtendCredit	23000000	USD
CY2018Q4	cma	Carrying Value Of Unused Commitments To Extend Credit CarryingValueOfUnusedCommitmentsToExtendCredit	24000000	USD
CY2019Q3	cma	Risk Participations Covering Standby And Commercial Letters Of Credit RiskParticipationsCoveringStandbyAndCommercialLettersOfCredit	164000000	USD
CY2018Q4	cma	Risk Participations Covering Standby And Commercial Letters Of Credit RiskParticipationsCoveringStandbyAndCommercialLettersOfCredit	136000000	USD
CY2018Q4	us-gaap	Letters Of Credit Outstanding Amount LettersOfCreditOutstandingAmount	3300000000	USD
CY2019Q3	cma	Carrying Value Of Standby And Commercial Letters Of Credit CarryingValueOfStandbyAndCommercialLettersOfCredit	33000000	USD
CY2019Q3	cma	Carrying Value Of Standby And Commercial Letters Of Credit Included In Deferred Fees CarryingValueOfStandbyAndCommercialLettersOfCreditIncludedInDeferredFees	27000000	USD
CY2019Q3	cma	Carrying Value Of Standby And Commercial Letters Of Credit Included In Allowance For Credit Losses On Lending Related Commitments CarryingValueOfStandbyAndCommercialLettersOfCreditIncludedInAllowanceForCreditLossesOnLendingRelatedCommitments	6000000	USD
CY2018Q4	cma	Carrying Value Of Standby And Commercial Letters Of Credit CarryingValueOfStandbyAndCommercialLettersOfCredit	34000000	USD
CY2018Q4	cma	Carrying Value Of Standby And Commercial Letters Of Credit Included In Deferred Fees CarryingValueOfStandbyAndCommercialLettersOfCreditIncludedInDeferredFees	28000000	USD
CY2018Q4	cma	Carrying Value Of Standby And Commercial Letters Of Credit Included In Allowance For Credit Losses On Lending Related Commitments CarryingValueOfStandbyAndCommercialLettersOfCreditIncludedInAllowanceForCreditLossesOnLendingRelatedCommitments	6000000	USD
CY2019Q3	cma	Total Internally Classified Watch List Letters Of Credit TotalInternallyClassifiedWatchListLettersOfCredit	45000000	USD
CY2018Q4	cma	Total Internally Classified Watch List Letters Of Credit TotalInternallyClassifiedWatchListLettersOfCredit	49000000	USD
CY2019Q3	cma	Watch List Letters Of Credit As Percentage Of Total Letters Of Credit WatchListLettersOfCreditAsPercentageOfTotalLettersOfCredit	0.014
CY2018Q4	cma	Watch List Letters Of Credit As Percentage Of Total Letters Of Credit WatchListLettersOfCreditAsPercentageOfTotalLettersOfCredit	0.015
CY2019Q3	cma	Notional Amount Of Derivative Credit Risk Participation Agreements NotionalAmountOfDerivativeCreditRiskParticipationAgreements	744000000	USD
CY2018Q4	cma	Notional Amount Of Derivative Credit Risk Participation Agreements NotionalAmountOfDerivativeCreditRiskParticipationAgreements	703000000	USD
CY2019Q3	us-gaap	Credit Derivative Maximum Exposure Undiscounted CreditDerivativeMaximumExposureUndiscounted	26000000	USD
CY2018Q4	us-gaap	Credit Derivative Maximum Exposure Undiscounted CreditDerivativeMaximumExposureUndiscounted	7000000	USD
CY2019Q3	us-gaap	Variable Interest Entity Nonconsolidated Carrying Amount Liabilities VariableInterestEntityNonconsolidatedCarryingAmountLiabilities	173000000	USD
	us-gaap	Variable Interest Entity Financial Or Other Support Amount VariableInterestEntityFinancialOrOtherSupportAmount	0	USD
	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodBeforeTax	0	USD
	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax	16000000	USD
	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci On Derivatives Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesBeforeTax	0	USD
	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax	0	USD
	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax	53000000	USD
CY2019Q3	us-gaap	Long Term Debt LongTermDebt	7311000000	USD
CY2018Q4	us-gaap	Long Term Debt LongTermDebt	6463000000	USD
CY2019Q3	us-gaap	Unamortized Debt Issuance Expense UnamortizedDebtIssuanceExpense	13000000	USD
CY2018Q4	us-gaap	Unamortized Debt Issuance Expense UnamortizedDebtIssuanceExpense	8000000	USD
CY2018Q4	us-gaap	Accumulated Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	-138000000	USD
CY2017Q4	us-gaap	Accumulated Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	-101000000	USD
	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Investment Transferred From Available For Sale To Equity Method Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAociForInvestmentTransferredFromAvailableForSaleToEquityMethodTax	0	USD
	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Investment Transferred From Available For Sale To Equity Method Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAociForInvestmentTransferredFromAvailableForSaleToEquityMethodTax	1000000	USD
	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	267000000	USD
	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	-254000000	USD
	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	62000000	USD
	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	-59000000	USD
	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	205000000	USD
	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	-195000000	USD
	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax	-8000000	USD
	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax	-20000000	USD
	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax	-2000000	USD
	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax	-5000000	USD
	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax	-6000000	USD
	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax	-15000000	USD
	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	211000000	USD
	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	-180000000	USD
CY2019Q3	us-gaap	Accumulated Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	73000000	USD
CY2018Q3	us-gaap	Accumulated Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	-280000000	USD
CY2018Q4	us-gaap	Accumulated Other Comprehensive Income Loss Cumulative Changes In Net Gain Loss From Cash Flow Hedges Effect Net Of Tax AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax	0	USD
CY2017Q4	us-gaap	Accumulated Other Comprehensive Income Loss Cumulative Changes In Net Gain Loss From Cash Flow Hedges Effect Net Of Tax AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax	0	USD
	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodBeforeTax	69000000	USD
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	152000000	shares
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	170000000	shares
	us-gaap	Other Comprehensive Income Loss Derivatives Qualifying As Hedges Net Of Tax OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax	54000000	USD
	us-gaap	Other Comprehensive Income Loss Derivatives Qualifying As Hedges Net Of Tax OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax	0	USD
CY2019Q3	us-gaap	Accumulated Other Comprehensive Income Loss Cumulative Changes In Net Gain Loss From Cash Flow Hedges Effect Net Of Tax AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax	54000000	USD
CY2018Q3	us-gaap	Accumulated Other Comprehensive Income Loss Cumulative Changes In Net Gain Loss From Cash Flow Hedges Effect Net Of Tax AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax	0	USD
CY2018Q4	us-gaap	Accumulated Other Comprehensive Income Loss Defined Benefit Pension And Other Postretirement Plans Net Of Tax AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax	-471000000	USD
CY2017Q4	us-gaap	Accumulated Other Comprehensive Income Loss Defined Benefit Pension And Other Postretirement Plans Net Of Tax AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax	-350000000	USD
	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Gain Loss Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossBeforeTax	-30000000	USD
	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Gain Loss Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossBeforeTax	-45000000	USD
	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	-20000000	USD
	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	-20000000	USD
	cma	Other Comprehensive Income Loss Reclassification Adjustment Pension And Other Postretirement Benefit Plans Recognized In Net Periodic Defined Benefit Cost Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentPensionAndOtherPostretirementBenefitPlansRecognizedInNetPeriodicDefinedBenefitCostBeforeTax	10000000	USD
	cma	Other Comprehensive Income Loss Reclassification Adjustment Pension And Other Postretirement Benefit Plans Recognized In Net Periodic Defined Benefit Cost Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentPensionAndOtherPostretirementBenefitPlansRecognizedInNetPeriodicDefinedBenefitCostBeforeTax	25000000	USD
	cma	Other Comprehensive Income Loss Reclassification Adjustment Pension And Other Postretirement Benefit Plans Recognized In Net Periodic Defined Benefit Cost Tax OtherComprehensiveIncomeLossReclassificationAdjustmentPensionAndOtherPostretirementBenefitPlansRecognizedInNetPeriodicDefinedBenefitCostTax	2000000	USD
	cma	Other Comprehensive Income Loss Reclassification Adjustment Pension And Other Postretirement Benefit Plans Recognized In Net Periodic Defined Benefit Cost Tax OtherComprehensiveIncomeLossReclassificationAdjustmentPensionAndOtherPostretirementBenefitPlansRecognizedInNetPeriodicDefinedBenefitCostTax	6000000	USD
	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	-8000000	USD
	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	-19000000	USD
CY2019Q3	us-gaap	Accumulated Other Comprehensive Income Loss Defined Benefit Pension And Other Postretirement Plans Net Of Tax AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax	-463000000	USD
CY2018Q3	us-gaap	Accumulated Other Comprehensive Income Loss Defined Benefit Pension And Other Postretirement Plans Net Of Tax AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax	-331000000	USD
CY2019Q3	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-336000000	USD
CY2018Q3	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-611000000	USD
CY2019Q3	us-gaap	Profit Loss ProfitLoss	292000000	USD
CY2018Q3	us-gaap	Profit Loss ProfitLoss	318000000	USD
	us-gaap	Profit Loss ProfitLoss	929000000	USD
	us-gaap	Profit Loss ProfitLoss	925000000	USD
CY2019Q3	us-gaap	Undistributed Earnings Loss Allocated To Participating Securities Diluted UndistributedEarningsLossAllocatedToParticipatingSecuritiesDiluted	2000000	USD
CY2018Q3	us-gaap	Undistributed Earnings Loss Allocated To Participating Securities Diluted UndistributedEarningsLossAllocatedToParticipatingSecuritiesDiluted	2000000	USD
	us-gaap	Undistributed Earnings Loss Allocated To Participating Securities Diluted UndistributedEarningsLossAllocatedToParticipatingSecuritiesDiluted	5000000	USD
	us-gaap	Undistributed Earnings Loss Allocated To Participating Securities Diluted UndistributedEarningsLossAllocatedToParticipatingSecuritiesDiluted	6000000	USD
CY2019Q3	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	290000000	USD
CY2018Q3	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	316000000	USD
	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	924000000	USD
	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	919000000	USD
CY2019Q3	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	147000000	shares
CY2018Q3	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	167000000	shares
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	152000000	shares
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	170000000	shares
CY2019Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.98
CY2018Q3	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	167000000	shares
CY2019Q3	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	1000000	shares
CY2018Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards State And Local DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal	4000000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	3000000	USD
CY2018Q3	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	2000000	shares
	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	2000000	shares
	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	2000000	shares
CY2019Q3	us-gaap	Incremental Common Shares Attributable To Call Options And Warrants IncrementalCommonSharesAttributableToCallOptionsAndWarrants	0	shares
CY2018Q3	us-gaap	Incremental Common Shares Attributable To Call Options And Warrants IncrementalCommonSharesAttributableToCallOptionsAndWarrants	1000000	shares
	us-gaap	Incremental Common Shares Attributable To Call Options And Warrants IncrementalCommonSharesAttributableToCallOptionsAndWarrants	0	shares
	us-gaap	Incremental Common Shares Attributable To Call Options And Warrants IncrementalCommonSharesAttributableToCallOptionsAndWarrants	1000000	shares
CY2019Q3	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	148000000	shares
CY2018Q3	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	170000000	shares
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	154000000	shares
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	173000000	shares
CY2019Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.96
CY2018Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.86
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	6.02
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	5.32
CY2019Q3	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	16000000	USD
CY2018Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	14000000	USD
CY2019Q3	us-gaap	Decrease In Unrecognized Tax Benefits Is Reasonably Possible DecreaseInUnrecognizedTaxBenefitsIsReasonablyPossible	1000000	USD
CY2019Q3	us-gaap	Unrecognized Tax Benefits Income Tax Penalties And Interest Accrued UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued	8000000	USD
CY2018Q4	us-gaap	Unrecognized Tax Benefits Income Tax Penalties And Interest Accrued UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued	7000000	USD
CY2019Q3	us-gaap	Deferred Tax Assets Liabilities Net DeferredTaxAssetsLiabilitiesNet	92000000	USD
	us-gaap	Profit Loss ProfitLoss	929000000	USD
	cma	Net Credit Related Charge Offs NetCreditRelatedChargeOffs	86000000	USD
	cma	Segment Reporting Average Assets SegmentReportingAverageAssets	70927000000	USD
	cma	Average Balance During Period Loans And Leases Receivable Net Of Deferred Income AverageBalanceDuringPeriodLoansAndLeasesReceivableNetOfDeferredIncome	50514000000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Liabilities Net DeferredTaxAssetsLiabilitiesNet	166000000	USD
	us-gaap	Increase Decrease In Deferred Income Taxes IncreaseDecreaseInDeferredIncomeTaxes	74000000	USD
	cma	Average Balance During Period Deposits AverageBalanceDuringPeriodDeposits	54909000000	USD
CY2019Q3	us-gaap	Legal Fees LegalFees	5000000	USD
CY2018Q3	us-gaap	Legal Fees LegalFees	4000000	USD
	us-gaap	Legal Fees LegalFees	10000000	USD
	us-gaap	Legal Fees LegalFees	11000000	USD
	cma	Number Of Major Business Segments NumberOfMajorBusinessSegments	3	segments
	cma	Number Of Major Business Segments NumberOfMajorBusinessSegments	3	segments
CY2019Q3	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	586000000	USD
CY2019Q3	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	35000000	USD
CY2019Q3	us-gaap	Noninterest Income NoninterestIncome	256000000	USD
CY2019Q3	us-gaap	Noninterest Expense NoninterestExpense	435000000	USD
CY2019Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	80000000	USD
CY2019Q3	us-gaap	Profit Loss ProfitLoss	292000000	USD
CY2019Q3	cma	Net Credit Related Charge Offs NetCreditRelatedChargeOffs	42000000	USD
CY2019Q3	cma	Segment Reporting Average Assets SegmentReportingAverageAssets	71736000000	USD
CY2019Q3	cma	Average Balance During Period Loans And Leases Receivable Net Of Deferred Income AverageBalanceDuringPeriodLoansAndLeasesReceivableNetOfDeferredIncome	50887000000	USD
CY2019Q3	cma	Average Balance During Period Deposits AverageBalanceDuringPeriodDeposits	55716000000	USD
CY2019Q3	cma	Return On Average Assets ReturnOnAverageAssets	0.0161
CY2019Q3	cma	Efficiency Ratio EfficiencyRatio	0.5154
CY2018Q3	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	599000000	USD
CY2018Q3	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	0	USD
CY2018Q3	us-gaap	Noninterest Income NoninterestIncome	234000000	USD
CY2018Q3	us-gaap	Noninterest Expense NoninterestExpense	452000000	USD
CY2018Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	63000000	USD
CY2018Q3	us-gaap	Profit Loss ProfitLoss	318000000	USD
CY2018Q3	cma	Net Credit Related Charge Offs NetCreditRelatedChargeOffs	15000000	USD
CY2018Q3	cma	Segment Reporting Average Assets SegmentReportingAverageAssets	71210000000	USD
CY2018Q3	cma	Average Balance During Period Loans And Leases Receivable Net Of Deferred Income AverageBalanceDuringPeriodLoansAndLeasesReceivableNetOfDeferredIncome	48584000000	USD
CY2018Q3	cma	Average Balance During Period Deposits AverageBalanceDuringPeriodDeposits	56093000000	USD
CY2018Q3	cma	Return On Average Assets ReturnOnAverageAssets	0.0177
CY2018Q3	cma	Efficiency Ratio EfficiencyRatio	0.5293
CY2019Q3	cma	Discretetaxbenefits Discretetaxbenefits	5000000	USD
CY2018Q3	cma	Discretetaxbenefits Discretetaxbenefits	-23000000	USD
	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	1795000000	USD
	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	66000000	USD
	us-gaap	Noninterest Income NoninterestIncome	744000000	USD
	us-gaap	Noninterest Expense NoninterestExpense	1292000000	USD
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	252000000	USD
	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	1738000000	USD
CY2018Q3	cma	Efficiency Ratio EfficiencyRatio	0.5293
	cma	Return On Average Assets ReturnOnAverageAssets	0.0175
	cma	Efficiency Ratio EfficiencyRatio	0.5066
CY2019Q3	cma	Discretetaxbenefits Discretetaxbenefits	5000000	USD
	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	-17000000	USD
	us-gaap	Noninterest Income NoninterestIncome	726000000	USD
	us-gaap	Noninterest Expense NoninterestExpense	1346000000	USD
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	210000000	USD
	us-gaap	Profit Loss ProfitLoss	925000000	USD
	cma	Net Credit Related Charge Offs NetCreditRelatedChargeOffs	40000000	USD
	cma	Segment Reporting Average Assets SegmentReportingAverageAssets	70689000000	USD
	cma	Average Balance During Period Loans And Leases Receivable Net Of Deferred Income AverageBalanceDuringPeriodLoansAndLeasesReceivableNetOfDeferredIncome	48744000000	USD
	cma	Average Balance During Period Deposits AverageBalanceDuringPeriodDeposits	56004000000	USD
	cma	Return On Average Assets ReturnOnAverageAssets	0.0175
	cma	Efficiency Ratio EfficiencyRatio	0.5412
	cma	Discretetaxbenefits Discretetaxbenefits	16000000	USD
	cma	Discretetaxbenefits Discretetaxbenefits	48000000	USD
	cma	Number Of Geographic Markets NumberOfGeographicMarkets	3	markets
	cma	Number Of Geographic Markets NumberOfGeographicMarkets	3	markets
CY2019Q3	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	586000000	USD
CY2019Q3	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	35000000	USD
CY2019Q3	us-gaap	Noninterest Income NoninterestIncome	256000000	USD
CY2019Q3	us-gaap	Noninterest Expense NoninterestExpense	435000000	USD
CY2019Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	80000000	USD
CY2019Q3	us-gaap	Profit Loss ProfitLoss	292000000	USD
CY2019Q3	cma	Net Credit Related Charge Offs NetCreditRelatedChargeOffs	42000000	USD
CY2019Q3	cma	Segment Reporting Average Assets SegmentReportingAverageAssets	71736000000	USD
CY2019Q3	cma	Average Balance During Period Loans And Leases Receivable Net Of Deferred Income AverageBalanceDuringPeriodLoansAndLeasesReceivableNetOfDeferredIncome	50887000000	USD
CY2019Q3	cma	Average Balance During Period Deposits AverageBalanceDuringPeriodDeposits	55716000000	USD
CY2019Q3	cma	Return On Average Assets ReturnOnAverageAssets	0.0161
CY2019Q3	cma	Efficiency Ratio EfficiencyRatio	0.5154
CY2018Q3	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	599000000	USD
CY2018Q3	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	0	USD
CY2018Q3	us-gaap	Noninterest Income NoninterestIncome	234000000	USD
CY2018Q3	us-gaap	Noninterest Expense NoninterestExpense	452000000	USD
CY2018Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	63000000	USD
CY2018Q3	us-gaap	Profit Loss ProfitLoss	318000000	USD
CY2018Q3	cma	Net Credit Related Charge Offs NetCreditRelatedChargeOffs	15000000	USD
CY2018Q3	cma	Segment Reporting Average Assets SegmentReportingAverageAssets	71210000000	USD
CY2018Q3	cma	Average Balance During Period Loans And Leases Receivable Net Of Deferred Income AverageBalanceDuringPeriodLoansAndLeasesReceivableNetOfDeferredIncome	48584000000	USD
CY2018Q3	cma	Average Balance During Period Deposits AverageBalanceDuringPeriodDeposits	56093000000	USD
CY2018Q3	cma	Return On Average Assets ReturnOnAverageAssets	0.0177
	us-gaap	Operating Lease Expense OperatingLeaseExpense	47000000	USD
	us-gaap	Variable Lease Cost VariableLeaseCost	11000000	USD
CY2018Q3	cma	Discretetaxbenefits Discretetaxbenefits	-23000000	USD
	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	1795000000	USD
	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	66000000	USD
	us-gaap	Noninterest Income NoninterestIncome	744000000	USD
	us-gaap	Noninterest Expense NoninterestExpense	1292000000	USD
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	252000000	USD
	us-gaap	Profit Loss ProfitLoss	929000000	USD
	cma	Net Credit Related Charge Offs NetCreditRelatedChargeOffs	86000000	USD
	cma	Segment Reporting Average Assets SegmentReportingAverageAssets	70927000000	USD
	cma	Average Balance During Period Loans And Leases Receivable Net Of Deferred Income AverageBalanceDuringPeriodLoansAndLeasesReceivableNetOfDeferredIncome	50514000000	USD
	cma	Average Balance During Period Deposits AverageBalanceDuringPeriodDeposits	54909000000	USD
	cma	Return On Average Assets ReturnOnAverageAssets	0.0175
	cma	Efficiency Ratio EfficiencyRatio	0.5066
	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	1738000000	USD
	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	-17000000	USD
	us-gaap	Noninterest Income NoninterestIncome	726000000	USD
	us-gaap	Noninterest Expense NoninterestExpense	1346000000	USD
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	210000000	USD
	us-gaap	Profit Loss ProfitLoss	925000000	USD
	cma	Net Credit Related Charge Offs NetCreditRelatedChargeOffs	40000000	USD
	cma	Segment Reporting Average Assets SegmentReportingAverageAssets	70689000000	USD
	cma	Average Balance During Period Loans And Leases Receivable Net Of Deferred Income AverageBalanceDuringPeriodLoansAndLeasesReceivableNetOfDeferredIncome	48744000000	USD
	cma	Average Balance During Period Deposits AverageBalanceDuringPeriodDeposits	56004000000	USD
	cma	Return On Average Assets ReturnOnAverageAssets	0.0175
	cma	Efficiency Ratio EfficiencyRatio	0.5412
	cma	Discretetaxbenefits Discretetaxbenefits	16000000	USD
	cma	Discretetaxbenefits Discretetaxbenefits	48000000	USD
CY2019Q3	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	190000000	USD
CY2019Q3	cma	Othersourcesofnoninterestincome Othersourcesofnoninterestincome	66000000	USD
CY2019Q3	us-gaap	Noninterest Income NoninterestIncome	256000000	USD
CY2018Q3	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	190000000	USD
CY2018Q3	cma	Othersourcesofnoninterestincome Othersourcesofnoninterestincome	44000000	USD
CY2018Q3	us-gaap	Noninterest Income NoninterestIncome	234000000	USD
	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	563000000	USD
	cma	Othersourcesofnoninterestincome Othersourcesofnoninterestincome	181000000	USD
	us-gaap	Noninterest Income NoninterestIncome	744000000	USD
	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	563000000	USD
	cma	Othersourcesofnoninterestincome Othersourcesofnoninterestincome	163000000	USD
	us-gaap	Noninterest Income NoninterestIncome	726000000	USD
CY2019Q3	us-gaap	Operating Lease Liability OperatingLeaseLiability	358000000	USD
CY2019Q3	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	320000000	USD
CY2019Q3	us-gaap	Lease Cost LeaseCost	20000000	USD
CY2019Q3	us-gaap	Operating Lease Expense OperatingLeaseExpense	16000000	USD
CY2019Q3	us-gaap	Variable Lease Cost VariableLeaseCost	4000000	USD
	us-gaap	Lease Cost LeaseCost	58000000	USD
CY2019Q3	us-gaap	Lessee Operating Lease Discount Rate LesseeOperatingLeaseDiscountRate	0.0382
	cma	New Rightof Use Assets NewRightofUseAssets	35000000	USD
CY2019Q3	us-gaap	Operating Lease Payments OperatingLeasePayments	17000000	USD
	us-gaap	Operating Lease Payments OperatingLeasePayments	50000000	USD
CY2019Q3	us-gaap	Lessee Operating Lease Liability Payments Remainder Of Fiscal Year LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear	10000000	USD
CY2019Q3	us-gaap	Lessee Operating Lease Liability Payments Due Year Two LesseeOperatingLeaseLiabilityPaymentsDueYearTwo	64000000	USD
CY2019Q3	us-gaap	Lessee Operating Lease Liability Payments Due Year Three LesseeOperatingLeaseLiabilityPaymentsDueYearThree	59000000	USD
CY2019Q3	us-gaap	Lessee Operating Lease Liability Payments Due Year Four LesseeOperatingLeaseLiabilityPaymentsDueYearFour	50000000	USD
CY2019Q3	us-gaap	Lessee Operating Lease Liability Payments Due Year Five LesseeOperatingLeaseLiabilityPaymentsDueYearFive	44000000	USD
CY2019Q3	us-gaap	Lessee Operating Lease Liability Payments Due After Year Five LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive	204000000	USD
CY2019Q3	us-gaap	Lessee Operating Lease Liability Payments Due LesseeOperatingLeaseLiabilityPaymentsDue	431000000	USD
	cma	Operatingleaseimputedinterest Operatingleaseimputedinterest	73000000	USD
CY2019Q3	us-gaap	Operating Lease Liability OperatingLeaseLiability	358000000	USD
CY2019Q3	us-gaap	Sales Type Lease Lease Income SalesTypeLeaseLeaseIncome	4000000	USD
	us-gaap	Sales Type Lease Lease Income SalesTypeLeaseLeaseIncome	10000000	USD
CY2019Q3	us-gaap	Sales Type And Direct Financing Leases Lease Receivable SalesTypeAndDirectFinancingLeasesLeaseReceivable	361000000	USD
CY2019Q3	us-gaap	Sales Type And Direct Financing Leases Lease Receivable Payments To Be Received Remainder Of Fiscal Year SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceivedRemainderOfFiscalYear	18000000	USD
CY2019Q3	us-gaap	Sales Type And Direct Financing Leases Lease Receivable Payments To Be Received Two Years SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceivedTwoYears	63000000	USD
CY2019Q3	us-gaap	Sales Type And Direct Financing Leases Lease Receivable Payments To Be Received Three Years SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceivedThreeYears	52000000	USD
CY2019Q3	us-gaap	Sales Type And Direct Financing Leases Lease Receivable Payments To Be Received Four Years SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceivedFourYears	88000000	USD
CY2019Q3	us-gaap	Sales Type And Direct Financing Leases Lease Receivable Payments To Be Received Five Years SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceivedFiveYears	39000000	USD
CY2019Q3	us-gaap	Sales Type And Direct Financing Leases Lease Receivable Payments To Be Received Thereafter SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceivedThereafter	58000000	USD
CY2019Q3	us-gaap	Sales Type And Direct Financing Leases Lease Receivable Payments To Be Received SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceived	318000000	USD
CY2019Q3	cma	Sales Typeand Direct Financing Leases Unguaranteed Residual Asset SalesTypeandDirectFinancingLeasesUnguaranteedResidualAsset	64000000	USD
CY2019Q3	us-gaap	Deferred Discounts Finance Charges And Interest Included In Receivables DeferredDiscountsFinanceChargesAndInterestIncludedInReceivables	21000000	USD
CY2019Q3	us-gaap	Sales Type And Direct Financing Leases Lease Receivable SalesTypeAndDirectFinancingLeasesLeaseReceivable	361000000	USD

Files In Submission

Name	View Source	Status
R42.htm	Edgar Link	pending
0000028412-19-000119-index-headers.html	Edgar Link	pending
0000028412-19-000119-index.html	Edgar Link	pending
0000028412-19-000119.txt	Edgar Link	pending
0000028412-19-000119-xbrl.zip	Edgar Link	pending
a2019q310q.htm	Edgar Link	pending
a2019q310qex311.htm	Edgar Link	pending
a2019q310qex312.htm	Edgar Link	pending
a2019q310qex32.htm	Edgar Link	pending
a2019q310q_htm.xml	Edgar Link	completed
cma-20190930.xsd	Edgar Link	pending
cma-20190930_cal.xml	Edgar Link	unprocessable
cma-20190930_def.xml	Edgar Link	unprocessable
cma-20190930_lab.xml	Edgar Link	unprocessable
cma-20190930_pre.xml	Edgar Link	unprocessable
FilingSummary.xml	Edgar Link	unprocessable
Financial_Report.xlsx	Edgar Link	pending
MetaLinks.json	Edgar Link	pending
R1.htm	Edgar Link	pending
R10.htm	Edgar Link	pending
R11.htm	Edgar Link	pending
R12.htm	Edgar Link	pending
R13.htm	Edgar Link	pending
R14.htm	Edgar Link	pending
R15.htm	Edgar Link	pending
R16.htm	Edgar Link	pending
R17.htm	Edgar Link	pending
R18.htm	Edgar Link	pending
R19.htm	Edgar Link	pending
R2.htm	Edgar Link	pending
R20.htm	Edgar Link	pending
R21.htm	Edgar Link	pending
R22.htm	Edgar Link	pending
R23.htm	Edgar Link	pending
R24.htm	Edgar Link	pending
R25.htm	Edgar Link	pending
R26.htm	Edgar Link	pending
R27.htm	Edgar Link	pending
R28.htm	Edgar Link	pending
R29.htm	Edgar Link	pending
R3.htm	Edgar Link	pending
R30.htm	Edgar Link	pending
R31.htm	Edgar Link	pending
R32.htm	Edgar Link	pending
R33.htm	Edgar Link	pending
R34.htm	Edgar Link	pending
R35.htm	Edgar Link	pending
R36.htm	Edgar Link	pending
R37.htm	Edgar Link	pending
R38.htm	Edgar Link	pending
R39.htm	Edgar Link	pending
R4.htm	Edgar Link	pending
R40.htm	Edgar Link	pending
R41.htm	Edgar Link	pending
R43.htm	Edgar Link	pending
R44.htm	Edgar Link	pending
R45.htm	Edgar Link	pending
R46.htm	Edgar Link	pending
R47.htm	Edgar Link	pending
R48.htm	Edgar Link	pending
R49.htm	Edgar Link	pending
R5.htm	Edgar Link	pending
R50.htm	Edgar Link	pending
R51.htm	Edgar Link	pending
R52.htm	Edgar Link	pending
R53.htm	Edgar Link	pending
R54.htm	Edgar Link	pending
R55.htm	Edgar Link	pending
R56.htm	Edgar Link	pending
R57.htm	Edgar Link	pending
R58.htm	Edgar Link	pending
R59.htm	Edgar Link	pending
R6.htm	Edgar Link	pending
R60.htm	Edgar Link	pending
R61.htm	Edgar Link	pending
R62.htm	Edgar Link	pending
R63.htm	Edgar Link	pending
R64.htm	Edgar Link	pending
R65.htm	Edgar Link	pending
R66.htm	Edgar Link	pending
R67.htm	Edgar Link	pending
R68.htm	Edgar Link	pending
R69.htm	Edgar Link	pending
R7.htm	Edgar Link	pending
R70.htm	Edgar Link	pending
R71.htm	Edgar Link	pending
R72.htm	Edgar Link	pending
R73.htm	Edgar Link	pending
R74.htm	Edgar Link	pending
R75.htm	Edgar Link	pending
R76.htm	Edgar Link	pending
R77.htm	Edgar Link	pending
R78.htm	Edgar Link	pending
R79.htm	Edgar Link	pending
R8.htm	Edgar Link	pending
R80.htm	Edgar Link	pending
R9.htm	Edgar Link	pending
report.css	Edgar Link	pending
Show.js	Edgar Link	pending

Create your account

Find Stocks Worth Researching

Deeply Understand Businesses

Value Businesses Intelligently

$CMA
COMERICA INC /NEW/ Stock $cma

2019 Q4 Form 10-Q Financial Statement

#000002841219000119 Filed on October 30, 2019

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$CMA COMERICA INC /NEW/ Stock $cma

2019 Q4 Form 10-Q Financial Statement

#000002841219000119 Filed on October 30, 2019

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$CMA
COMERICA INC /NEW/ Stock $cma