$CMA
COMERICA INC /NEW/ Stock $cma

$cma Overview Financials Valuation SEC Filings Company Website

2020 Q2 Form 10-Q Financial Statement

#000002841220000088 Filed on July 31, 2020

Income Statement

Concept	2020 Q2	2019 Q2
Revenue	$511.0M	$727.0M
YoY Change	-29.71%	11.85%
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	$29.00M	$28.00M
YoY Change	3.57%	-3.45%
% of Gross Profit
Operating Expenses
YoY Change
Operating Profit
YoY Change
Interest Expense	$40.00M	$124.0M
YoY Change	-67.74%	106.67%
% of Operating Profit
Other Income/Expense, Net
YoY Change
Pretax Income	$146.0M	$385.0M
YoY Change	-62.08%	-8.11%
Income Tax	$28.00M	$87.00M
% Of Pretax Income	19.18%	22.6%
Net Earnings	$118.0M	$298.0M
YoY Change	-60.4%	-8.59%
Net Earnings / Revenue	23.09%	40.99%
Basic Earnings Per Share	$0.85	$1.95
Diluted Earnings Per Share	$0.84	$1.94
COMMON SHARES
Basic Shares Outstanding	139.0M shares	152.0M shares
Diluted Shares Outstanding	139.0M shares	153.0M shares

Balance Sheet

Concept	2020 Q2	2019 Q2
SHORT-TERM ASSETS
Cash & Short-Term Investments
YoY Change
Cash & Equivalents	$13.31B	$3.581B
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	$450.0M	$470.0M
YoY Change	-4.26%	0.64%
Goodwill
YoY Change
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	$84.40B	$72.54B
YoY Change	16.35%	0.76%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable
YoY Change
Accrued Expenses	$1.602B	$1.386B
YoY Change	15.58%	31.13%
Deferred Revenue
YoY Change
Short-Term Debt	$752.0M	$1.733B
YoY Change	-56.61%	2887.93%
Long-Term Debt Due
YoY Change
Total Short-Term Liabilities	$1.602B	$1.386B
YoY Change	15.58%	31.13%
LONG-TERM LIABILITIES
Long-Term Debt	$2.971B	$2.758B
YoY Change	7.72%	54.68%
Other Long-Term Liabilities
YoY Change
Total Long-Term Liabilities	$2.971B	$2.758B
YoY Change	7.72%	54.68%
TOTAL LIABILITIES
Total Short-Term Liabilities	$1.602B	$1.386B
Total Long-Term Liabilities	$2.971B	$2.758B
Total Liabilities	$76.60B	$65.21B
YoY Change	17.45%	2.04%
SHAREHOLDERS EQUITY
Retained Earnings	$9.404B	$9.176B
YoY Change	2.48%	9.58%
Common Stock	$3.314B	$3.309B
YoY Change	0.15%	0.73%
Preferred Stock
YoY Change
Treasury Stock (at cost)	$5.469B	$4.780B
YoY Change	14.41%	59.81%
Treasury Stock Shares	89.12M shares	78.37M shares
Shareholders Equity	$7.802B	$7.323B
YoY Change
Total Liabilities & Shareholders Equity	$84.40B	$72.54B
YoY Change	16.35%	0.76%

Cashflow Statement

Concept	2020 Q2	2019 Q2
OPERATING ACTIVITIES
Net Income	$118.0M	$298.0M
YoY Change	-60.4%	-8.59%
Depreciation, Depletion And Amortization	$29.00M	$28.00M
YoY Change	3.57%	-3.45%
Cash From Operating Activities	$45.00M	$385.0M
YoY Change	-88.31%	50.39%
INVESTING ACTIVITIES
Capital Expenditures	-$14.00M	-$13.00M
YoY Change	7.69%	-38.1%
Acquisitions
YoY Change
Other Investing Activities	$204.0M	-$1.569B
YoY Change	-113.0%	186.31%
Cash From Investing Activities	$190.0M	-$1.582B
YoY Change	-112.01%	178.03%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net
YoY Change
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	8.221B	1.297B
YoY Change	533.85%	-250.29%
NET CHANGE
Cash From Operating Activities	45.00M	385.0M
Cash From Investing Activities	190.0M	-1.582B
Cash From Financing Activities	8.221B	1.297B
Net Change In Cash	8.456B	100.0M
YoY Change	8356.0%	-108.5%
FREE CASH FLOW
Cash From Operating Activities	$45.00M	$385.0M
Capital Expenditures	-$14.00M	-$13.00M
Free Cash Flow	$59.00M	$398.0M
YoY Change	-85.18%	43.68%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
	dei	Entity Address Postal Zip Code EntityAddressPostalZipCode	75201
	dei	City Area Code CityAreaCode	(214)
	dei	Local Phone Number LocalPhoneNumber	462-6831
CY2019Q4	us-gaap	Available For Sale Securities AvailableForSaleSecurities	12398000000	USD
	dei	Entity Central Index Key EntityCentralIndexKey	0000028412
	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2020
	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	Q2
	dei	Amendment Flag AmendmentFlag	false
CY2019Q4	cma	Increaseinthe Cet1capitalratio IncreaseintheCET1capitalratio	0.0002
	us-gaap	Average Term Of Credit Risk Derivatives1 AverageTermOfCreditRiskDerivatives1	P4Y8M12D
	dei	Document Type DocumentType	10-Q
	dei	Document Quarterly Report DocumentQuarterlyReport	true
	dei	Document Period End Date DocumentPeriodEndDate	2020-06-30
	dei	Document Transition Report DocumentTransitionReport	false
	dei	Entity File Number EntityFileNumber	1-10706
	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 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	Security12b Title Security12bTitle	Common Stock, $5 par value
	dei	Trading Symbol TradingSymbol	CMA
	dei	Security Exchange Name SecurityExchangeName	NYSE
	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
	dei	Entity Interactive Data Current EntityInteractiveDataCurrent	Yes
	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
	dei	Entity Small Business EntitySmallBusiness	false
	dei	Entity Emerging Growth Company EntityEmergingGrowthCompany	false
	dei	Entity Shell Company EntityShellCompany	false
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CY2020Q2	us-gaap	Cash And Due From Banks CashAndDueFromBanks	1048000000	USD
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CY2019Q4	us-gaap	Other Short Term Investments OtherShortTermInvestments	155000000	USD
CY2020Q2	us-gaap	Available For Sale Securities AvailableForSaleSecurities	12759000000	USD
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CY2020Q2	cma	Real Estate Construction Loans Net Of Deferred Income RealEstateConstructionLoansNetOfDeferredIncome	3952000000	USD
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CY2020Q2	us-gaap	Preferred Stock No Par Value PreferredStockNoParValue	0
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CY2020Q2	cma	Outside Processing Fee Expense OutsideProcessingFeeExpense	62000000	USD
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CY2019Q2	us-gaap	Occupancy Net OccupancyNet	37000000	USD
	us-gaap	Occupancy Net OccupancyNet	74000000	USD
	us-gaap	Occupancy Net OccupancyNet	74000000	USD
CY2020Q2	cma	Software Expenses SoftwareExpenses	39000000	USD
CY2019Q2	cma	Software Expenses SoftwareExpenses	28000000	USD
	cma	Software Expenses SoftwareExpenses	76000000	USD
	cma	Software Expenses SoftwareExpenses	57000000	USD
CY2020Q2	us-gaap	Equipment Expense EquipmentExpense	12000000	USD
CY2019Q2	us-gaap	Equipment Expense EquipmentExpense	12000000	USD
	us-gaap	Equipment Expense EquipmentExpense	24000000	USD
	us-gaap	Equipment Expense EquipmentExpense	24000000	USD
CY2020Q2	us-gaap	Advertising Expense AdvertisingExpense	8000000	USD
CY2019Q2	us-gaap	Advertising Expense AdvertisingExpense	9000000	USD
	us-gaap	Advertising Expense AdvertisingExpense	15000000	USD
	us-gaap	Advertising Expense AdvertisingExpense	14000000	USD
CY2020Q2	us-gaap	Federal Deposit Insurance Corporation Premium Expense FederalDepositInsuranceCorporationPremiumExpense	8000000	USD
CY2019Q2	us-gaap	Federal Deposit Insurance Corporation Premium Expense FederalDepositInsuranceCorporationPremiumExpense	6000000	USD
	us-gaap	Federal Deposit Insurance Corporation Premium Expense FederalDepositInsuranceCorporationPremiumExpense	16000000	USD
	us-gaap	Federal Deposit Insurance Corporation Premium Expense FederalDepositInsuranceCorporationPremiumExpense	11000000	USD
CY2020Q2	us-gaap	Other Noninterest Expense OtherNoninterestExpense	25000000	USD
CY2019Q2	us-gaap	Other Noninterest Expense OtherNoninterestExpense	22000000	USD
	us-gaap	Other Noninterest Expense OtherNoninterestExpense	50000000	USD
	us-gaap	Other Noninterest Expense OtherNoninterestExpense	39000000	USD
CY2020Q2	us-gaap	Noninterest Expense NoninterestExpense	440000000	USD
CY2019Q2	us-gaap	Noninterest Expense NoninterestExpense	424000000	USD
	us-gaap	Noninterest Expense NoninterestExpense	865000000	USD
	us-gaap	Noninterest Expense NoninterestExpense	857000000	USD
CY2020Q2	cma	Income Loss From Continuing Operations Before Income Taxes IncomeLossFromContinuingOperationsBeforeIncomeTaxes	140000000	USD
CY2019Q2	cma	Income Loss From Continuing Operations Before Income Taxes IncomeLossFromContinuingOperationsBeforeIncomeTaxes	385000000	USD
	cma	Income Loss From Continuing Operations Before Income Taxes IncomeLossFromContinuingOperationsBeforeIncomeTaxes	54000000	USD
	cma	Income Loss From Continuing Operations Before Income Taxes IncomeLossFromContinuingOperationsBeforeIncomeTaxes	809000000	USD
CY2020Q2	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	27000000	USD
CY2019Q2	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	87000000	USD
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	6000000	USD
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	172000000	USD
CY2020Q2	us-gaap	Profit Loss ProfitLoss	113000000	USD
CY2019Q2	us-gaap	Profit Loss ProfitLoss	298000000	USD
	us-gaap	Profit Loss ProfitLoss	48000000	USD
	us-gaap	Profit Loss ProfitLoss	637000000	USD
CY2020Q2	us-gaap	Undistributed Earnings Loss Allocated To Participating Securities Diluted UndistributedEarningsLossAllocatedToParticipatingSecuritiesDiluted	1000000	USD
CY2019Q2	us-gaap	Undistributed Earnings Loss Allocated To Participating Securities Diluted UndistributedEarningsLossAllocatedToParticipatingSecuritiesDiluted	1000000	USD
	us-gaap	Undistributed Earnings Loss Allocated To Participating Securities Diluted UndistributedEarningsLossAllocatedToParticipatingSecuritiesDiluted	1000000	USD
	us-gaap	Undistributed Earnings Loss Allocated To Participating Securities Diluted UndistributedEarningsLossAllocatedToParticipatingSecuritiesDiluted	3000000	USD
CY2020Q2	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	112000000	USD
CY2019Q2	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	297000000	USD
	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	47000000	USD
	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	634000000	USD
CY2020Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.81
CY2019Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.95
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.34
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	4.10
CY2020Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.80
CY2019Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.94
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.34
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	4.06
CY2020Q2	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	97000000	USD
CY2019Q2	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	429000000	USD
	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	441000000	USD
	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	864000000	USD
CY2020Q2	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	98000000	USD
CY2019Q2	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	100000000	USD
	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	192000000	USD
	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	205000000	USD
CY2020Q2	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.68
CY2019Q2	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.67
	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	1.36
	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	1.34
CY2019Q1	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	7409000000	USD
CY2019Q2	us-gaap	Profit Loss ProfitLoss	298000000	USD
CY2019Q2	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	131000000	USD
CY2019Q2	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.67
CY2019Q2	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	100000000	USD
CY2019Q2	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	425000000	USD
CY2019Q2	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	2000000	USD
CY2019Q2	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	8000000	USD
CY2019Q2	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	7323000000	USD
CY2020Q1	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	7402000000	USD
CY2020Q2	us-gaap	Profit Loss ProfitLoss	113000000	USD
CY2020Q2	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-16000000	USD
CY2020Q2	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.68
CY2020Q2	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	98000000	USD
CY2020Q2	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	1000000	USD
CY2020Q2	us-gaap	Stock And Warrants Issued During Period Value Preferred Stock And Warrants StockAndWarrantsIssuedDuringPeriodValuePreferredStockAndWarrants	395000000	USD
CY2020Q2	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	1000000	USD
CY2020Q2	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	4000000	USD
CY2020Q2	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	7802000000	USD
CY2018Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	7507000000	USD
CY2019Q1	cma	Cumulative Effect Of Change In Accounting Principle CumulativeEffectOfChangeInAccountingPrinciple	-14000000	USD
	us-gaap	Profit Loss ProfitLoss	637000000	USD
	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	227000000	USD
	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	1.34
	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	205000000	USD
	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	859000000	USD
	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	2000000	USD
	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	32000000	USD
CY2019Q2	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	7323000000	USD
CY2019Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	7327000000	USD
CY2020Q1	cma	Cumulative Effect Of Change In Accounting Principle CumulativeEffectOfChangeInAccountingPrinciple	13000000	USD
	us-gaap	Profit Loss ProfitLoss	48000000	USD
	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	393000000	USD
	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	1.36
	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	192000000	USD
	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	194000000	USD
	us-gaap	Stock And Warrants Issued During Period Value Preferred Stock And Warrants StockAndWarrantsIssuedDuringPeriodValuePreferredStockAndWarrants	395000000	USD
	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	0	USD
	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	12000000	USD
CY2020Q2	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	7802000000	USD
	us-gaap	Profit Loss ProfitLoss	48000000	USD
	us-gaap	Profit Loss ProfitLoss	637000000	USD
	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	549000000	USD
	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	31000000	USD
	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-95000000	USD
	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-4000000	USD
	us-gaap	Depreciation And Amortization DepreciationAndAmortization	55000000	USD
	us-gaap	Depreciation And Amortization DepreciationAndAmortization	57000000	USD
	us-gaap	Defined Benefit Plan Net Periodic Benefit Cost DefinedBenefitPlanNetPeriodicBenefitCost	-13000000	USD
	us-gaap	Defined Benefit Plan Net Periodic Benefit Cost DefinedBenefitPlanNetPeriodicBenefitCost	-14000000	USD
	us-gaap	Share Based Compensation ShareBasedCompensation	12000000	USD
	us-gaap	Share Based Compensation ShareBasedCompensation	32000000	USD
	us-gaap	Accretion Amortization Of Discounts And Premiums Investments AccretionAmortizationOfDiscountsAndPremiumsInvestments	-1000000	USD
	us-gaap	Accretion Amortization Of Discounts And Premiums Investments AccretionAmortizationOfDiscountsAndPremiumsInvestments	-1000000	USD
	us-gaap	Debt And Equity Securities Gain Loss DebtAndEquitySecuritiesGainLoss	0	USD
	us-gaap	Debt And Equity Securities Gain Loss DebtAndEquitySecuritiesGainLoss	-8000000	USD
	us-gaap	Increase Decrease In Interest And Dividends Receivable IncreaseDecreaseInInterestAndDividendsReceivable	-43000000	USD
	us-gaap	Increase Decrease In Interest And Dividends Receivable IncreaseDecreaseInInterestAndDividendsReceivable	12000000	USD
	us-gaap	Increase Decrease In Accrued Liabilities IncreaseDecreaseInAccruedLiabilities	-64000000	USD
	us-gaap	Increase Decrease In Accrued Liabilities IncreaseDecreaseInAccruedLiabilities	-86000000	USD
	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	-208000000	USD
	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	225000000	USD
	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	744000000	USD
	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	425000000	USD
	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	1311000000	USD
	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	991000000	USD
	us-gaap	Proceeds From Sale Of Available For Sale Securities ProceedsFromSaleOfAvailableForSaleSecurities	0	USD
	us-gaap	Proceeds From Sale Of Available For Sale Securities ProceedsFromSaleOfAvailableForSaleSecurities	987000000	USD
	us-gaap	Payments To Acquire Available For Sale Securities PaymentsToAcquireAvailableForSaleSecurities	1387000000	USD
	us-gaap	Payments To Acquire Available For Sale Securities PaymentsToAcquireAvailableForSaleSecurities	2043000000	USD
	us-gaap	Payments For Proceeds From Loans And Leases PaymentsForProceedsFromLoansAndLeases	3229000000	USD
	us-gaap	Payments For Proceeds From Loans And Leases PaymentsForProceedsFromLoansAndLeases	1685000000	USD
	us-gaap	Proceeds From Sale Of Foreclosed Assets ProceedsFromSaleOfForeclosedAssets	1000000	USD
	us-gaap	Proceeds From Sale Of Foreclosed Assets ProceedsFromSaleOfForeclosedAssets	0	USD
	cma	Net Increase In Fixed Assets NetIncreaseInFixedAssets	29000000	USD
	cma	Net Increase In Fixed Assets NetIncreaseInFixedAssets	29000000	USD
	us-gaap	Payments To Acquire Federal Home Loan Bank Stock PaymentsToAcquireFederalHomeLoanBankStock	51000000	USD
	us-gaap	Payments To Acquire Federal Home Loan Bank Stock PaymentsToAcquireFederalHomeLoanBankStock	49000000	USD
	us-gaap	Repayments Of Federal Home Loan Bank Borrowings RepaymentsOfFederalHomeLoanBankBorrowings	30000000	USD
	us-gaap	Repayments Of Federal Home Loan Bank Borrowings RepaymentsOfFederalHomeLoanBankBorrowings	0	USD
	us-gaap	Proceeds From Life Insurance Policies ProceedsFromLifeInsurancePolicies	10000000	USD
	us-gaap	Proceeds From Life Insurance Policies ProceedsFromLifeInsurancePolicies	7000000	USD
	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-3344000000	USD
	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-1821000000	USD
	us-gaap	Increase Decrease In Deposits IncreaseDecreaseInDeposits	10327000000	USD
	us-gaap	Increase Decrease In Deposits IncreaseDecreaseInDeposits	-209000000	USD
	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	681000000	USD
	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	1689000000	USD
	us-gaap	Repayments Of Debt RepaymentsOfDebt	925000000	USD
	us-gaap	Repayments Of Debt RepaymentsOfDebt	350000000	USD
	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	0	USD
	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	350000000	USD
	us-gaap	Stock And Warrants Issued During Period Value Preferred Stock And Warrants StockAndWarrantsIssuedDuringPeriodValuePreferredStockAndWarrants	395000000	USD
	us-gaap	Stock And Warrants Issued During Period Value Preferred Stock And Warrants StockAndWarrantsIssuedDuringPeriodValuePreferredStockAndWarrants	0	USD
	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	199000000	USD
	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	872000000	USD
	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	191000000	USD
	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	203000000	USD
	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	5000000	USD
	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	11000000	USD
	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	10093000000	USD
	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	416000000	USD
	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	7493000000	USD
	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	-980000000	USD
CY2019Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	5818000000	USD
CY2018Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	4561000000	USD
CY2020Q2	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	13311000000	USD
CY2019Q2	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	3581000000	USD
	us-gaap	Interest Paid InterestPaid	152000000	USD
	us-gaap	Interest Paid InterestPaid	220000000	USD
	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	77000000	USD
	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	161000000	USD
	us-gaap	Transfer To Other Real Estate TransferToOtherRealEstate	1000000	USD
	us-gaap	Transfer To Other Real Estate TransferToOtherRealEstate	2000000	USD
CY2019Q4	cma	Overallallowanceforcreditlosses Overallallowanceforcreditlosses	668000000	USD
CY2019Q4	cma	Businessloanspercentofportfolio Businessloanspercentofportfolio	0.91
CY2020Q1	cma	Increaseinretailloansallowanceforcreditlosses Increaseinretailloansallowanceforcreditlosses	25000000	USD
CY2020Q2	cma	Libo Rloanspercentofportfolio LIBORloanspercentofportfolio	0.72
CY2020Q2	cma	Percentofloanportfoliowithinterestrateswapstoconvertvariable Lbio Rtofixedrates PercentofloanportfoliowithinterestrateswapstoconvertvariableLBIORtofixedrates	0.11
CY2020Q2	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Less Than12 Months Accumulated Loss AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss	0	USD
CY2020Q2	us-gaap	Available For Sale Securities Amortized Cost AvailableForSaleSecuritiesAmortizedCost	12388000000	USD
CY2020Q2	us-gaap	Available For Sale Securities Accumulated Gross Unrealized Gain Before Tax AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax	371000000	USD
CY2020Q2	us-gaap	Available For Sale Securities Accumulated Gross Unrealized Loss Before Tax AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax	0	USD
CY2020Q2	us-gaap	Available For Sale Securities AvailableForSaleSecurities	12759000000	USD
CY2019Q4	us-gaap	Available For Sale Securities Amortized Cost AvailableForSaleSecuritiesAmortizedCost	12313000000	USD
CY2019Q4	us-gaap	Available For Sale Securities Accumulated Gross Unrealized Gain Before Tax AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax	113000000	USD
CY2019Q4	us-gaap	Available For Sale Securities Accumulated Gross Unrealized Loss Before Tax AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax	28000000	USD
CY2019Q4	us-gaap	Available For Sale Securities AvailableForSaleSecurities	12398000000	USD
CY2020Q2	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Less Than Twelve Months Fair Value AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue	1000000	USD
CY2020Q2	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or Longer Fair Value AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue	0	USD
CY2020Q2	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position12 Months Or Longer Accumulated Loss AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss	0	USD
CY2020Q2	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Fair Value AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue	1000000	USD
CY2020Q2	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Accumulated Loss AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLoss	0	USD
CY2019Q4	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Less Than Twelve Months Fair Value AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue	1494000000	USD
CY2019Q4	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Less Than12 Months Accumulated Loss AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss	7000000	USD
CY2019Q4	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or Longer Fair Value AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue	1906000000	USD
CY2019Q4	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position12 Months Or Longer Accumulated Loss AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss	21000000	USD
CY2019Q4	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Fair Value AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue	3400000000	USD
CY2019Q4	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Accumulated Loss AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLoss	28000000	USD
	us-gaap	Financing Receivable Nonaccrual Interest Income FinancingReceivableNonaccrualInterestIncome	0	USD
CY2020Q2	us-gaap	Debt Securities Available For Sale Restricted DebtSecuritiesAvailableForSaleRestricted	5700000000	USD
CY2020Q2	us-gaap	Financial Instruments Owned And Pledged As Collateral At Fair Value FinancialInstrumentsOwnedAndPledgedAsCollateralAtFairValue	5200000000	USD
CY2020Q2	us-gaap	Debt Instrument Unused Borrowing Capacity Amount DebtInstrumentUnusedBorrowingCapacityAmount	5000000000.0	USD
CY2020Q2	us-gaap	Securities Borrowed Liability SecuritiesBorrowedLiability	506000000	USD
CY2020Q2	cma	Liabilities Secured By Pledged Securities LiabilitiesSecuredByPledgedSecurities	432000000	USD
CY2020Q2	us-gaap	Financing Receivable Recorded Investment Past Due FinancingReceivableRecordedInvestmentPastDue	248000000	USD
CY2020Q2	us-gaap	Loans And Leases Receivable Impaired Nonperforming Nonaccrual Of Interest LoansAndLeasesReceivableImpairedNonperformingNonaccrualOfInterest	267000000	USD
CY2020Q2	us-gaap	Financing Receivable Recorded Investment Current FinancingReceivableRecordedInvestmentCurrent	52931000000	USD
CY2020Q2	us-gaap	Loans And Leases Receivable Net Of Deferred Income LoansAndLeasesReceivableNetOfDeferredIncome	53446000000	USD
CY2019Q4	us-gaap	Financing Receivable Recorded Investment Past Due FinancingReceivableRecordedInvestmentPastDue	153000000	USD
CY2019Q4	us-gaap	Loans And Leases Receivable Impaired Nonperforming Nonaccrual Of Interest LoansAndLeasesReceivableImpairedNonperformingNonaccrualOfInterest	199000000	USD
CY2019Q4	us-gaap	Financing Receivable Recorded Investment Current FinancingReceivableRecordedInvestmentCurrent	50017000000	USD
CY2019Q4	us-gaap	Loans And Leases Receivable Net Of Deferred Income LoansAndLeasesReceivableNetOfDeferredIncome	50369000000	USD
CY2020Q2	us-gaap	Financing Receivable Originated In Current Fiscal Year FinancingReceivableOriginatedInCurrentFiscalYear	6984000000	USD
CY2020Q2	us-gaap	Financing Receivable Originated In Fiscal Year Before Latest Fiscal Year FinancingReceivableOriginatedInFiscalYearBeforeLatestFiscalYear	6332000000	USD
CY2020Q2	us-gaap	Financing Receivable Originated Two Years Before Latest Fiscal Year FinancingReceivableOriginatedTwoYearsBeforeLatestFiscalYear	5056000000	USD
CY2020Q2	us-gaap	Financing Receivable Originated Three Years Before Latest Fiscal Year FinancingReceivableOriginatedThreeYearsBeforeLatestFiscalYear	3920000000	USD
CY2020Q2	us-gaap	Financing Receivable Originated Four Years Before Latest Fiscal Year FinancingReceivableOriginatedFourYearsBeforeLatestFiscalYear	2389000000	USD
CY2020Q2	us-gaap	Financing Receivable Originated Five Or More Years Before Latest Fiscal Year FinancingReceivableOriginatedFiveOrMoreYearsBeforeLatestFiscalYear	5322000000	USD
CY2020Q2	us-gaap	Financing Receivable Revolving FinancingReceivableRevolving	23337000000	USD
CY2020Q2	cma	Financing Receivable Revolving Convertedto Term FinancingReceivableRevolvingConvertedtoTerm	106000000	USD
CY2020Q2	us-gaap	Loans And Leases Receivable Net Of Deferred Income LoansAndLeasesReceivableNetOfDeferredIncome	53446000000	USD
CY2019Q4	us-gaap	Loans And Leases Receivable Net Of Deferred Income LoansAndLeasesReceivableNetOfDeferredIncome	50369000000	USD
CY2020Q1	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	978000000	USD
CY2019Q1	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	677000000	USD
CY2020Q2	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	138000000	USD
CY2019Q2	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	44000000	USD
CY2020Q2	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	1066000000	USD
CY2019Q2	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	688000000	USD
CY2019Q4	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	668000000	USD
CY2018Q4	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	701000000	USD
	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	549000000	USD
	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	31000000	USD
CY2020Q2	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	1066000000	USD
CY2019Q2	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	688000000	USD
CY2020Q2	cma	Financing Receivable Ratio Of Allowance For Credit Losses To All Loans FinancingReceivableRatioOfAllowanceForCreditLossesToAllLoans	0.0199
CY2019Q2	cma	Financing Receivable Ratio Of Allowance For Credit Losses To All Loans FinancingReceivableRatioOfAllowanceForCreditLossesToAllLoans	0.0133
CY2020Q2	cma	Financing Receivable Ratio Of Allowance For Loan Losses To All Loans Excluding Ppp Loans FinancingReceivableRatioOfAllowanceForLoanLossesToAllLoansExcludingPPPLoans	0.0215
CY2020Q2	us-gaap	Financing Receivable Nonaccrual Interest Income FinancingReceivableNonaccrualInterestIncome	0	USD
	us-gaap	Financing Receivable Nonaccrual Interest Income FinancingReceivableNonaccrualInterestIncome	0	USD
CY2019Q2	us-gaap	Financing Receivable Nonaccrual Interest Income FinancingReceivableNonaccrualInterestIncome	0	USD
CY2020Q2	us-gaap	Financing Receivable Nonaccrual No Allowance FinancingReceivableNonaccrualNoAllowance	85000000	USD
CY2020Q2	us-gaap	Financing Receivable Recorded Investment Nonaccrual Status FinancingReceivableRecordedInvestmentNonaccrualStatus	182000000	USD
CY2020Q2	us-gaap	Loans And Leases Receivable Impaired Nonperforming Nonaccrual Of Interest LoansAndLeasesReceivableImpairedNonperformingNonaccrualOfInterest	267000000	USD
CY2019Q4	us-gaap	Financing Receivable Nonaccrual No Allowance FinancingReceivableNonaccrualNoAllowance	69000000	USD
CY2019Q4	us-gaap	Financing Receivable Recorded Investment Nonaccrual Status FinancingReceivableRecordedInvestmentNonaccrualStatus	130000000	USD
CY2019Q4	us-gaap	Loans And Leases Receivable Impaired Nonperforming Nonaccrual Of Interest LoansAndLeasesReceivableImpairedNonperformingNonaccrualOfInterest	199000000	USD
CY2020Q2	us-gaap	Foreclosed Assets ForeclosedAssets	11000000	USD
CY2019Q4	us-gaap	Foreclosed Assets ForeclosedAssets	11000000	USD
CY2019Q4	us-gaap	Mortgage Loans In Process Of Foreclosure Amount MortgageLoansInProcessOfForeclosureAmount	0	USD
CY2020Q2	us-gaap	Mortgage Loans In Process Of Foreclosure Amount MortgageLoansInProcessOfForeclosureAmount	0	USD
CY2020Q2	us-gaap	Financing Receivable Modifications Post Modification Recorded Investment2 FinancingReceivableModificationsPostModificationRecordedInvestment2	0	USD
CY2019Q2	us-gaap	Financing Receivable Modifications Post Modification Recorded Investment2 FinancingReceivableModificationsPostModificationRecordedInvestment2	1000000	USD
	us-gaap	Financing Receivable Modifications Post Modification Recorded Investment2 FinancingReceivableModificationsPostModificationRecordedInvestment2	17000000	USD
	us-gaap	Financing Receivable Modifications Post Modification Recorded Investment2 FinancingReceivableModificationsPostModificationRecordedInvestment2	13000000	USD
CY2020Q2	us-gaap	Loans And Leases Receivable Impaired Commitment To Lend LoansAndLeasesReceivableImpairedCommitmentToLend	2000000	USD
CY2019Q4	us-gaap	Loans And Leases Receivable Impaired Commitment To Lend LoansAndLeasesReceivableImpairedCommitmentToLend	3000000	USD
CY2020Q2	cma	Derivative Assets Cash Collateral DerivativeAssetsCashCollateral	216000000	USD
CY2020Q2	us-gaap	Derivative Asset Fair Value Of Collateral DerivativeAssetFairValueOfCollateral	56000000	USD
CY2020Q2	cma	Cash Collateral Posted For Derivatives In Liability Position CashCollateralPostedForDerivativesInLiabilityPosition	30000000	USD
CY2020Q2	us-gaap	Derivative Net Liability Position Aggregate Fair Value DerivativeNetLiabilityPositionAggregateFairValue	0	USD
CY2020Q2	us-gaap	Derivative Notional Amount DerivativeNotionalAmount	33754000000	USD
CY2020Q2	us-gaap	Derivative Fair Value Of Derivative Asset DerivativeFairValueOfDerivativeAsset	935000000	USD
CY2020Q2	us-gaap	Derivative Fair Value Of Derivative Liability DerivativeFairValueOfDerivativeLiability	351000000	USD
CY2019Q4	us-gaap	Derivative Notional Amount DerivativeNotionalAmount	30134000000	USD
CY2019Q4	us-gaap	Derivative Fair Value Of Derivative Asset DerivativeFairValueOfDerivativeAsset	317000000	USD
CY2019Q4	us-gaap	Derivative Fair Value Of Derivative Liability DerivativeFairValueOfDerivativeLiability	141000000	USD
CY2020Q2	us-gaap	Derivative Asset Fair Value Gross Liability DerivativeAssetFairValueGrossLiability	54000000	USD
CY2020Q2	us-gaap	Derivative Liability Fair Value Gross Asset DerivativeLiabilityFairValueGrossAsset	54000000	USD
CY2019Q4	us-gaap	Derivative Asset Fair Value Gross Liability DerivativeAssetFairValueGrossLiability	63000000	USD
CY2019Q4	us-gaap	Derivative Liability Fair Value Gross Asset DerivativeLiabilityFairValueGrossAsset	63000000	USD
CY2020Q2	us-gaap	Derivative Asset Collateral Obligation To Return Cash Offset DerivativeAssetCollateralObligationToReturnCashOffset	214000000	USD
CY2020Q2	us-gaap	Derivative Liability Collateral Right To Reclaim Cash Offset DerivativeLiabilityCollateralRightToReclaimCashOffset	28000000	USD
CY2019Q4	us-gaap	Derivative Asset Collateral Obligation To Return Cash Offset DerivativeAssetCollateralObligationToReturnCashOffset	11000000	USD
CY2019Q4	us-gaap	Derivative Liability Collateral Right To Reclaim Cash Offset DerivativeLiabilityCollateralRightToReclaimCashOffset	12000000	USD
CY2020Q2	us-gaap	Derivative Assets DerivativeAssets	667000000	USD
CY2020Q2	us-gaap	Derivative Liabilities DerivativeLiabilities	269000000	USD
CY2019Q4	us-gaap	Derivative Assets DerivativeAssets	243000000	USD
CY2019Q4	us-gaap	Derivative Liabilities DerivativeLiabilities	66000000	USD
CY2020Q2	us-gaap	Derivative Collateral Obligation To Return Securities DerivativeCollateralObligationToReturnSecurities	0	USD
CY2020Q2	us-gaap	Derivative Collateral Right To Reclaim Securities DerivativeCollateralRightToReclaimSecurities	53000000	USD
CY2019Q4	us-gaap	Derivative Collateral Obligation To Return Securities DerivativeCollateralObligationToReturnSecurities	0	USD
CY2019Q4	us-gaap	Derivative Collateral Right To Reclaim Securities DerivativeCollateralRightToReclaimSecurities	21000000	USD
CY2020Q2	us-gaap	Derivative Fair Value Of Derivative Asset Amount Offset Against Collateral DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCollateral	667000000	USD
CY2020Q2	us-gaap	Derivative Fair Value Of Derivative Liability Amount Offset Against Collateral DerivativeFairValueOfDerivativeLiabilityAmountOffsetAgainstCollateral	216000000	USD
CY2019Q4	us-gaap	Derivative Fair Value Of Derivative Asset Amount Offset Against Collateral DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCollateral	243000000	USD
CY2019Q4	us-gaap	Derivative Fair Value Of Derivative Liability Amount Offset Against Collateral DerivativeFairValueOfDerivativeLiabilityAmountOffsetAgainstCollateral	45000000	USD
CY2020Q2	us-gaap	Derivative Credit Risk Valuation Adjustment Derivative Assets DerivativeCreditRiskValuationAdjustmentDerivativeAssets	25000000	USD
CY2019Q4	us-gaap	Derivative Credit Risk Valuation Adjustment Derivative Assets DerivativeCreditRiskValuationAdjustmentDerivativeAssets	9000000	USD
CY2020Q2	us-gaap	Interest Expense Long Term Debt InterestExpenseLongTermDebt	19000000	USD
CY2019Q2	us-gaap	Interest Expense Long Term Debt InterestExpenseLongTermDebt	51000000	USD
	us-gaap	Interest Expense Long Term Debt InterestExpenseLongTermDebt	59000000	USD
	us-gaap	Interest Expense Long Term Debt InterestExpenseLongTermDebt	102000000	USD
CY2020Q2	cma	Risk Participations Covering Standby And Commercial Letters Of Credit RiskParticipationsCoveringStandbyAndCommercialLettersOfCredit	163000000	USD
CY2019Q4	cma	Risk Participations Covering Standby And Commercial Letters Of Credit RiskParticipationsCoveringStandbyAndCommercialLettersOfCredit	161000000	USD
	us-gaap	Gain Loss On Foreign Currency Derivative Instruments Not Designated As Hedging Instruments GainLossOnForeignCurrencyDerivativeInstrumentsNotDesignatedAsHedgingInstruments	0	USD
CY2020Q2	cma	Allowance For Off Balance Sheet Credit Losses AllowanceForOffBalanceSheetCreditLosses	59000000	USD
CY2019Q4	cma	Allowance For Off Balance Sheet Credit Losses AllowanceForOffBalanceSheetCreditLosses	31000000	USD
CY2020Q2	cma	Carrying Value Of Unused Commitments To Extend Credit CarryingValueOfUnusedCommitmentsToExtendCredit	47000000	USD
CY2019Q4	cma	Carrying Value Of Unused Commitments To Extend Credit CarryingValueOfUnusedCommitmentsToExtendCredit	25000000	USD
	cma	Longest Expiration Year Letters Of Credit LongestExpirationYearLettersOfCredit	2028
CY2020Q2	us-gaap	Letters Of Credit Outstanding Amount LettersOfCreditOutstandingAmount	3200000000	USD
CY2019Q4	us-gaap	Letters Of Credit Outstanding Amount LettersOfCreditOutstandingAmount	3300000000	USD
CY2020Q2	cma	Carrying Value Of Standby And Commercial Letters Of Credit CarryingValueOfStandbyAndCommercialLettersOfCredit	34000000	USD
CY2020Q2	cma	Carrying Value Of Standby And Commercial Letters Of Credit Included In Deferred Fees CarryingValueOfStandbyAndCommercialLettersOfCreditIncludedInDeferredFees	22000000	USD
CY2020Q2	cma	Carrying Value Of Standby And Commercial Letters Of Credit Included In Allowance For Credit Losses On Lending Related Commitments CarryingValueOfStandbyAndCommercialLettersOfCreditIncludedInAllowanceForCreditLossesOnLendingRelatedCommitments	12000000	USD
CY2019Q4	cma	Carrying Value Of Standby And Commercial Letters Of Credit CarryingValueOfStandbyAndCommercialLettersOfCredit	32000000	USD
CY2019Q4	cma	Carrying Value Of Standby And Commercial Letters Of Credit Included In Deferred Fees CarryingValueOfStandbyAndCommercialLettersOfCreditIncludedInDeferredFees	26000000	USD
CY2019Q4	cma	Carrying Value Of Standby And Commercial Letters Of Credit Included In Allowance For Credit Losses On Lending Related Commitments CarryingValueOfStandbyAndCommercialLettersOfCreditIncludedInAllowanceForCreditLossesOnLendingRelatedCommitments	6000000	USD
CY2020Q2	cma	Total Internally Classified Watch List Letters Of Credit TotalInternallyClassifiedWatchListLettersOfCredit	83000000	USD
CY2019Q4	cma	Total Internally Classified Watch List Letters Of Credit TotalInternallyClassifiedWatchListLettersOfCredit	44000000	USD
CY2020Q2	cma	Watch List Letters Of Credit As Percentage Of Total Letters Of Credit WatchListLettersOfCreditAsPercentageOfTotalLettersOfCredit	0.026
CY2019Q4	cma	Watch List Letters Of Credit As Percentage Of Total Letters Of Credit WatchListLettersOfCreditAsPercentageOfTotalLettersOfCredit	0.013
CY2020Q2	cma	Notional Amount Of Derivative Credit Risk Participation Agreements NotionalAmountOfDerivativeCreditRiskParticipationAgreements	1100000000	USD
CY2019Q4	cma	Notional Amount Of Derivative Credit Risk Participation Agreements NotionalAmountOfDerivativeCreditRiskParticipationAgreements	786000000	USD
CY2020Q2	us-gaap	Credit Derivative Maximum Exposure Undiscounted CreditDerivativeMaximumExposureUndiscounted	76000000	USD
CY2019Q4	us-gaap	Credit Derivative Maximum Exposure Undiscounted CreditDerivativeMaximumExposureUndiscounted	20000000	USD
CY2020Q2	us-gaap	Variable Interest Entity Activity Between Vie And Entity Expense VariableInterestEntityActivityBetweenVIEAndEntityExpense	173000000	USD
	us-gaap	Variable Interest Entity Financial Or Other Support Amount VariableInterestEntityFinancialOrOtherSupportAmount	0	USD
	us-gaap	Variable Interest Entity Financial Or Other Support Amount VariableInterestEntityFinancialOrOtherSupportAmount	0	USD
CY2020Q2	us-gaap	Long Term Debt LongTermDebt	6521000000	USD
CY2019Q4	us-gaap	Long Term Debt LongTermDebt	7269000000	USD
CY2020Q2	us-gaap	Federal Home Loan Bank Advances Weighted Average Interest Rate FederalHomeLoanBankAdvancesWeightedAverageInterestRate	0.0031
CY2020Q2	us-gaap	Pledged Financial Instruments Not Separately Reported Loans Receivable Pledged For Federal Home Loan Bank Debt PledgedFinancialInstrumentsNotSeparatelyReportedLoansReceivablePledgedForFederalHomeLoanBankDebt	18300000000	USD
CY2020Q2	us-gaap	Financial Instruments Owned And Pledged As Collateral At Fair Value FinancialInstrumentsOwnedAndPledgedAsCollateralAtFairValue	5200000000	USD
CY2020Q2	cma	Shortterm Federal Home Loan Bank Advances ShorttermFederalHomeLoanBankAdvances	750000000	USD
CY2020Q2	us-gaap	Federal Home Loan Bank Advances Long Term FederalHomeLoanBankAdvancesLongTerm	3600000000	USD
CY2020Q2	us-gaap	Line Of Credit Facility Remaining Borrowing Capacity LineOfCreditFacilityRemainingBorrowingCapacity	10100000000	USD
CY2020Q2	us-gaap	Unamortized Debt Issuance Expense UnamortizedDebtIssuanceExpense	11000000	USD
CY2019Q4	us-gaap	Unamortized Debt Issuance Expense UnamortizedDebtIssuanceExpense	12000000	USD
CY2019Q4	us-gaap	Accumulated Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	65000000	USD
CY2018Q4	us-gaap	Accumulated Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	-138000000	USD
	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	286000000	USD
	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	229000000	USD
	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	68000000	USD
	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	54000000	USD
	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	218000000	USD
	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	175000000	USD
	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax	0	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 Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax	0	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 Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax	0	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 Available For Sale Securities Adjustment Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	218000000	USD
	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	181000000	USD
CY2020Q2	us-gaap	Accumulated Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	283000000	USD
CY2019Q2	us-gaap	Accumulated Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	43000000	USD
CY2019Q4	us-gaap	Accumulated Other Comprehensive Income Loss Cumulative Changes In Net Gain Loss From Cash Flow Hedges Effect Net Of Tax AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax	34000000	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
	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodBeforeTax	233000000	USD
	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodBeforeTax	51000000	USD
	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax	56000000	USD
	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax	12000000	USD
	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax	177000000	USD
	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax	39000000	USD
	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci On Derivatives Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesBeforeTax	22000000	USD
	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci On Derivatives Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesBeforeTax	-1000000	USD
	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci On Derivatives Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesTax	7000000	USD
	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci On Derivatives Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesTax	0	USD
	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci On Derivatives Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax	15000000	USD
	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci On Derivatives Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax	-1000000	USD
	us-gaap	Other Comprehensive Income Loss Derivatives Qualifying As Hedges Net Of Tax OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax	162000000	USD
	us-gaap	Other Comprehensive Income Loss Derivatives Qualifying As Hedges Net Of Tax OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax	40000000	USD
CY2020Q2	us-gaap	Accumulated Other Comprehensive Income Loss Cumulative Changes In Net Gain Loss From Cash Flow Hedges Effect Net Of Tax AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax	196000000	USD
CY2019Q2	us-gaap	Accumulated Other Comprehensive Income Loss Cumulative Changes In Net Gain Loss From Cash Flow Hedges Effect Net Of Tax AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax	40000000	USD
CY2019Q4	us-gaap	Accumulated Other Comprehensive Income Loss Defined Benefit Pension And Other Postretirement Plans Net Of Tax AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax	-334000000	USD
CY2018Q4	us-gaap	Accumulated Other Comprehensive Income Loss Defined Benefit Pension And Other Postretirement Plans Net Of Tax AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax	-471000000	USD
	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Gain Loss Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossBeforeTax	-31000000	USD
	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Gain Loss Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossBeforeTax	-21000000	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	-14000000	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	-13000000	USD
	cma	Other Comprehensive Income Loss Reclassification Adjustment Pension And Other Postretirement Benefit Plans Recognized In Net Periodic Defined Benefit Cost Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentPensionAndOtherPostretirementBenefitPlansRecognizedInNetPeriodicDefinedBenefitCostBeforeTax	17000000	USD
	cma	Other Comprehensive Income Loss Reclassification Adjustment Pension And Other Postretirement Benefit Plans Recognized In Net Periodic Defined Benefit Cost Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentPensionAndOtherPostretirementBenefitPlansRecognizedInNetPeriodicDefinedBenefitCostBeforeTax	8000000	USD
	cma	Other Comprehensive Income Loss Reclassification Adjustment Pension And Other Postretirement Benefit Plans Recognized In Net Periodic Defined Benefit Cost Tax OtherComprehensiveIncomeLossReclassificationAdjustmentPensionAndOtherPostretirementBenefitPlansRecognizedInNetPeriodicDefinedBenefitCostTax	4000000	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
	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	-13000000	USD
	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	-6000000	USD
CY2020Q2	us-gaap	Accumulated Other Comprehensive Income Loss Defined Benefit Pension And Other Postretirement Plans Net Of Tax AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax	-321000000	USD
CY2019Q2	us-gaap	Accumulated Other Comprehensive Income Loss Defined Benefit Pension And Other Postretirement Plans Net Of Tax AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax	-465000000	USD
CY2020Q2	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	158000000	USD
CY2019Q2	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-382000000	USD
CY2020Q2	us-gaap	Profit Loss ProfitLoss	113000000	USD
CY2019Q2	us-gaap	Profit Loss ProfitLoss	298000000	USD
	us-gaap	Profit Loss ProfitLoss	48000000	USD
	us-gaap	Profit Loss ProfitLoss	637000000	USD
CY2020Q2	us-gaap	Undistributed Earnings Loss Allocated To Participating Securities Diluted UndistributedEarningsLossAllocatedToParticipatingSecuritiesDiluted	1000000	USD
CY2019Q2	us-gaap	Undistributed Earnings Loss Allocated To Participating Securities Diluted UndistributedEarningsLossAllocatedToParticipatingSecuritiesDiluted	1000000	USD
	us-gaap	Undistributed Earnings Loss Allocated To Participating Securities Diluted UndistributedEarningsLossAllocatedToParticipatingSecuritiesDiluted	1000000	USD
	us-gaap	Undistributed Earnings Loss Allocated To Participating Securities Diluted UndistributedEarningsLossAllocatedToParticipatingSecuritiesDiluted	3000000	USD
CY2020Q2	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	112000000	USD
CY2019Q2	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	297000000	USD
	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	47000000	USD
	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	634000000	USD
CY2020Q2	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	139000000	shares
CY2019Q2	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	152000000	shares
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	140000000	shares
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	155000000	shares
CY2020Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.81
CY2019Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.95
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.34
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	4.10
CY2020Q2	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	139000000	shares
CY2019Q2	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	152000000	shares
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	140000000	shares
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	155000000	shares
CY2020Q2	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	0	shares
CY2019Q2	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	1000000	shares
	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	1000000	shares
	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	1000000	shares
CY2020Q2	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	139000000	shares
CY2019Q2	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	153000000	shares
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	141000000	shares
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	156000000	shares
CY2020Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.80
CY2019Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.94
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.34
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	4.06
CY2020Q2	cma	Stockoptionsexcludedbecauseexercisepricesweregreaterthanaveragemarketpriceofshares Stockoptionsexcludedbecauseexercisepricesweregreaterthanaveragemarketpriceofshares	2056133	shares
CY2019Q2	cma	Stockoptionsexcludedbecauseexercisepricesweregreaterthanaveragemarketpriceofshares Stockoptionsexcludedbecauseexercisepricesweregreaterthanaveragemarketpriceofshares	470162	shares
	cma	Stockoptionsexcludedbecauseexercisepricesweregreaterthanaveragemarketpriceofshares Stockoptionsexcludedbecauseexercisepricesweregreaterthanaveragemarketpriceofshares	1633078	shares
	cma	Stockoptionsexcludedbecauseexercisepricesweregreaterthanaveragemarketpriceofshares Stockoptionsexcludedbecauseexercisepricesweregreaterthanaveragemarketpriceofshares	446610	shares
CY2020Q2	cma	Depositary Shares Issued DepositarySharesIssued	400000	shares
	us-gaap	Preferred Stock Dividend Rate Percentage PreferredStockDividendRatePercentage	0.05625
CY2020Q2	us-gaap	Preferred Stock Liquidation Preference Value PreferredStockLiquidationPreferenceValue	100000	USD
CY2020Q2	us-gaap	Preferred Stock Liquidation Preference PreferredStockLiquidationPreference	1000
	us-gaap	Proceeds From Issuance Of Preferred Stock Preference Stock And Warrants ProceedsFromIssuanceOfPreferredStockPreferenceStockAndWarrants	400000000	USD
CY2020Q2	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	18000000	USD
CY2019Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	17000000	USD
	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	1000000	USD
CY2020Q2	us-gaap	Unrecognized Tax Benefits Income Tax Penalties And Interest Accrued UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued	6000000	USD
CY2019Q4	us-gaap	Unrecognized Tax Benefits Income Tax Penalties And Interest Accrued UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued	8000000	USD
CY2020Q2	us-gaap	Deferred Tax Assets Liabilities Net DeferredTaxAssetsLiabilitiesNet	11000000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Liabilities Net DeferredTaxAssetsLiabilitiesNet	42000000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards State And Local DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal	3000000	USD
CY2020Q2	us-gaap	Deferred Tax Assets Operating Loss Carryforwards State And Local DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal	3000000	USD
CY2020Q2	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	3000000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	3000000	USD
CY2020Q2	us-gaap	Legal Fees LegalFees	5000000	USD
CY2019Q2	us-gaap	Legal Fees LegalFees	4000000	USD
	us-gaap	Legal Fees LegalFees	7000000	USD
	us-gaap	Legal Fees LegalFees	5000000	USD
	cma	Number Of Major Business Segments NumberOfMajorBusinessSegments	3	segments
	cma	Number Of Major Business Segments NumberOfMajorBusinessSegments	3	segments
CY2020Q2	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	471000000	USD
CY2020Q2	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	138000000	USD
CY2020Q2	us-gaap	Noninterest Income NoninterestIncome	247000000	USD
CY2020Q2	us-gaap	Noninterest Expense NoninterestExpense	440000000	USD
CY2020Q2	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	27000000	USD
CY2020Q2	us-gaap	Profit Loss ProfitLoss	113000000	USD
CY2020Q2	cma	Net Credit Related Charge Offs NetCreditRelatedChargeOffs	50000000	USD
CY2020Q2	cma	Segment Reporting Average Assets SegmentReportingAverageAssets	81644000000	USD
CY2020Q2	cma	Average Balance During Period Loans And Leases Receivable Net Of Deferred Income AverageBalanceDuringPeriodLoansAndLeasesReceivableNetOfDeferredIncome	53498000000	USD
CY2020Q2	cma	Average Balance During Period Deposits AverageBalanceDuringPeriodDeposits	64282000000	USD
CY2020Q2	cma	Return On Average Assets ReturnOnAverageAssets	0.0055
CY2020Q2	cma	Efficiency Ratio EfficiencyRatio	0.6114
CY2019Q2	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	603000000	USD
CY2019Q2	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	44000000	USD
CY2019Q2	us-gaap	Noninterest Income NoninterestIncome	250000000	USD
CY2019Q2	us-gaap	Noninterest Expense NoninterestExpense	424000000	USD
CY2019Q2	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	87000000	USD
CY2019Q2	us-gaap	Profit Loss ProfitLoss	298000000	USD
CY2019Q2	cma	Net Credit Related Charge Offs NetCreditRelatedChargeOffs	33000000	USD
CY2019Q2	cma	Segment Reporting Average Assets SegmentReportingAverageAssets	71252000000	USD
CY2019Q2	cma	Average Balance During Period Loans And Leases Receivable Net Of Deferred Income AverageBalanceDuringPeriodLoansAndLeasesReceivableNetOfDeferredIncome	50963000000	USD
CY2019Q2	cma	Average Balance During Period Deposits AverageBalanceDuringPeriodDeposits	54995000000	USD
CY2019Q2	cma	Return On Average Assets ReturnOnAverageAssets	0.0168
CY2019Q2	cma	Efficiency Ratio EfficiencyRatio	0.4965
	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	984000000	USD
	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	549000000	USD
	us-gaap	Noninterest Income NoninterestIncome	484000000	USD
	us-gaap	Noninterest Expense NoninterestExpense	865000000	USD
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	6000000	USD
	us-gaap	Profit Loss ProfitLoss	48000000	USD
	cma	Net Credit Related Charge Offs NetCreditRelatedChargeOffs	134000000	USD
	cma	Segment Reporting Average Assets SegmentReportingAverageAssets	77454000000	USD
	cma	Average Balance During Period Loans And Leases Receivable Net Of Deferred Income AverageBalanceDuringPeriodLoansAndLeasesReceivableNetOfDeferredIncome	51551000000	USD
	cma	Average Balance During Period Deposits AverageBalanceDuringPeriodDeposits	60524000000	USD
	cma	Return On Average Assets ReturnOnAverageAssets	0.0012
	cma	Efficiency Ratio EfficiencyRatio	0.5880
	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	1209000000	USD
	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	31000000	USD
	us-gaap	Noninterest Income NoninterestIncome	488000000	USD
	us-gaap	Noninterest Expense NoninterestExpense	857000000	USD
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	172000000	USD
	us-gaap	Profit Loss ProfitLoss	637000000	USD
	cma	Net Credit Related Charge Offs NetCreditRelatedChargeOffs	44000000	USD
	cma	Segment Reporting Average Assets SegmentReportingAverageAssets	70515000000	USD
	cma	Average Balance During Period Loans And Leases Receivable Net Of Deferred Income AverageBalanceDuringPeriodLoansAndLeasesReceivableNetOfDeferredIncome	50323000000	USD
	cma	Average Balance During Period Deposits AverageBalanceDuringPeriodDeposits	54498000000	USD
	cma	Return On Average Assets ReturnOnAverageAssets	0.0182
	cma	Efficiency Ratio EfficiencyRatio	0.5023
	cma	Number Of Geographic Markets NumberOfGeographicMarkets	3	markets
	cma	Number Of Geographic Markets NumberOfGeographicMarkets	3	markets
CY2020Q2	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	471000000	USD
CY2020Q2	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	138000000	USD
CY2020Q2	us-gaap	Noninterest Income NoninterestIncome	247000000	USD
CY2020Q2	us-gaap	Noninterest Expense NoninterestExpense	440000000	USD
CY2020Q2	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	27000000	USD
CY2020Q2	us-gaap	Profit Loss ProfitLoss	113000000	USD
CY2020Q2	cma	Net Credit Related Charge Offs NetCreditRelatedChargeOffs	50000000	USD
CY2020Q2	cma	Segment Reporting Average Assets SegmentReportingAverageAssets	81644000000	USD
CY2020Q2	cma	Average Balance During Period Loans And Leases Receivable Net Of Deferred Income AverageBalanceDuringPeriodLoansAndLeasesReceivableNetOfDeferredIncome	53498000000	USD
CY2020Q2	cma	Average Balance During Period Deposits AverageBalanceDuringPeriodDeposits	64282000000	USD
CY2020Q2	cma	Return On Average Assets ReturnOnAverageAssets	0.0055
CY2020Q2	cma	Efficiency Ratio EfficiencyRatio	0.6114
CY2019Q2	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	603000000	USD
CY2019Q2	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	44000000	USD
CY2019Q2	us-gaap	Noninterest Income NoninterestIncome	250000000	USD
CY2019Q2	us-gaap	Noninterest Expense NoninterestExpense	424000000	USD
CY2019Q2	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	87000000	USD
CY2019Q2	us-gaap	Profit Loss ProfitLoss	298000000	USD
CY2019Q2	cma	Net Credit Related Charge Offs NetCreditRelatedChargeOffs	33000000	USD
CY2019Q2	cma	Segment Reporting Average Assets SegmentReportingAverageAssets	71252000000	USD
CY2019Q2	cma	Average Balance During Period Loans And Leases Receivable Net Of Deferred Income AverageBalanceDuringPeriodLoansAndLeasesReceivableNetOfDeferredIncome	50963000000	USD
CY2019Q2	cma	Average Balance During Period Deposits AverageBalanceDuringPeriodDeposits	54995000000	USD
CY2019Q2	cma	Return On Average Assets ReturnOnAverageAssets	0.0168
CY2019Q2	cma	Efficiency Ratio EfficiencyRatio	0.4965
	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	984000000	USD
	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	549000000	USD
	cma	Net Credit Related Charge Offs NetCreditRelatedChargeOffs	44000000	USD
	us-gaap	Noninterest Income NoninterestIncome	484000000	USD
	us-gaap	Noninterest Expense NoninterestExpense	865000000	USD
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	6000000	USD
	us-gaap	Profit Loss ProfitLoss	48000000	USD
	cma	Net Credit Related Charge Offs NetCreditRelatedChargeOffs	134000000	USD
	cma	Segment Reporting Average Assets SegmentReportingAverageAssets	77454000000	USD
	cma	Average Balance During Period Loans And Leases Receivable Net Of Deferred Income AverageBalanceDuringPeriodLoansAndLeasesReceivableNetOfDeferredIncome	51551000000	USD
	cma	Average Balance During Period Deposits AverageBalanceDuringPeriodDeposits	60524000000	USD
	cma	Return On Average Assets ReturnOnAverageAssets	0.0012
	cma	Efficiency Ratio EfficiencyRatio	0.5880
	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	1209000000	USD
	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	31000000	USD
	us-gaap	Noninterest Income NoninterestIncome	488000000	USD
	us-gaap	Noninterest Expense NoninterestExpense	857000000	USD
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	172000000	USD
	us-gaap	Profit Loss ProfitLoss	637000000	USD
	cma	Segment Reporting Average Assets SegmentReportingAverageAssets	70515000000	USD
	cma	Average Balance During Period Loans And Leases Receivable Net Of Deferred Income AverageBalanceDuringPeriodLoansAndLeasesReceivableNetOfDeferredIncome	50323000000	USD
	cma	Average Balance During Period Deposits AverageBalanceDuringPeriodDeposits	54498000000	USD
	cma	Return On Average Assets ReturnOnAverageAssets	0.0182
	cma	Efficiency Ratio EfficiencyRatio	0.5023
CY2020Q2	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	188000000	USD
CY2020Q2	cma	Othersourcesofnoninterestincome Othersourcesofnoninterestincome	59000000	USD
CY2020Q2	us-gaap	Noninterest Income NoninterestIncome	247000000	USD
CY2019Q2	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	189000000	USD
CY2019Q2	cma	Othersourcesofnoninterestincome Othersourcesofnoninterestincome	61000000	USD
CY2019Q2	us-gaap	Noninterest Income NoninterestIncome	250000000	USD
	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	373000000	USD
	cma	Othersourcesofnoninterestincome Othersourcesofnoninterestincome	111000000	USD
	us-gaap	Noninterest Income NoninterestIncome	484000000	USD
	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	373000000	USD
	cma	Othersourcesofnoninterestincome Othersourcesofnoninterestincome	115000000	USD
	us-gaap	Noninterest Income NoninterestIncome	488000000	USD
CY2020Q2	us-gaap	Preferred Stock Value PreferredStockValue	395000000	USD

Files In Submission

Name	View Source	Status
0000028412-20-000088-index-headers.html	Edgar Link	pending
0000028412-20-000088-index.html	Edgar Link	pending
0000028412-20-000088.txt	Edgar Link	pending
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a2020q210qex1011.htm	Edgar Link	pending
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a2020q210qex311.htm	Edgar Link	pending
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cma-20200630.htm	Edgar Link	pending
cma-20200630.xsd	Edgar Link	pending
cma-20200630_cal.xml	Edgar Link	unprocessable
cma-20200630_def.xml	Edgar Link	unprocessable
cma-20200630_htm.xml	Edgar Link	completed
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cma-20200630_pre.xml	Edgar Link	unprocessable
FilingSummary.xml	Edgar Link	unprocessable
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MetaLinks.json	Edgar Link	pending
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report.css	Edgar Link	pending
Show.js	Edgar Link	pending

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$CMA
COMERICA INC /NEW/ Stock $cma

2020 Q2 Form 10-Q Financial Statement

#000002841220000088 Filed on July 31, 2020

Income Statement

Balance Sheet

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Facts In Submission

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$CMA COMERICA INC /NEW/ Stock $cma

2020 Q2 Form 10-Q Financial Statement

#000002841220000088 Filed on July 31, 2020

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$CMA
COMERICA INC /NEW/ Stock $cma