$CMA
COMERICA INC /NEW/ Stock $cma

$cma Overview Financials Valuation SEC Filings Company Website

2017 Q4 Form 10-Q Financial Statement

#000002841217000123 Filed on October 30, 2017

Income Statement

Concept	2017 Q4	2017 Q3	2016 Q3
Revenue	$650.0M	$579.0M	$480.0M
YoY Change	34.3%	20.63%	7.14%
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	$31.00M	$32.00M
YoY Change	0.0%	-3.13%	6.67%
% of Gross Profit
Operating Expenses
YoY Change
Operating Profit
YoY Change
Interest Expense	$60.00M	$33.00M	$30.00M
YoY Change	106.9%	10.0%	15.38%
% of Operating Profit
Other Income/Expense, Net
YoY Change
Pretax Income	$330.0M	$334.0M	$213.0M
YoY Change	46.02%	56.81%	7.04%
Income Tax	$93.00M	$108.0M	$64.00M
% Of Pretax Income	28.18%	32.34%	30.05%
Net Earnings	$326.0M	$226.0M	$149.0M
YoY Change	98.78%	51.68%	9.56%
Net Earnings / Revenue	50.15%	39.03%	31.04%
Basic Earnings Per Share	$1.90	$1.29	$0.87
Diluted Earnings Per Share	$1.87	$1.26	$0.84
COMMON SHARES
Basic Shares Outstanding	173.9M shares	174.0M shares	171.0M shares
Diluted Shares Outstanding		177.0M shares	176.0M shares

Balance Sheet

Concept	2017 Q4	2017 Q3	2016 Q3
SHORT-TERM ASSETS
Cash & Short-Term Investments
YoY Change
Cash & Equivalents	$5.845B	$6.204B	$8.040B
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	$466.0M	$467.0M	$528.0M
YoY Change	-6.99%	-11.55%	-2.4%
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	$71.57B	$72.02B	$74.12B
YoY Change	-1.93%	-2.84%	4.38%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable
YoY Change
Accrued Expenses	$1.069B	$1.018B	$1.234B
YoY Change	5.63%	-17.5%	-12.67%
Deferred Revenue
YoY Change
Short-Term Debt	$10.00M	$509.0M	$12.00M
YoY Change	-60.0%	4141.67%	-88.99%
Long-Term Debt Due
YoY Change
Total Short-Term Liabilities	$1.069B	$1.018B	$1.234B
YoY Change	5.63%	-17.5%	-12.67%
LONG-TERM LIABILITIES
Long-Term Debt	$1.822B	$1.837B	$3.090B
YoY Change	-22.8%	-40.55%	-0.32%
Other Long-Term Liabilities
YoY Change
Total Long-Term Liabilities	$1.822B	$1.837B	$3.090B
YoY Change	-22.8%	-40.55%	-0.32%
TOTAL LIABILITIES
Total Short-Term Liabilities	$1.069B	$1.018B	$1.234B
Total Long-Term Liabilities	$1.822B	$1.837B	$3.090B
Total Liabilities	$63.60B	$63.98B	$66.40B
YoY Change	-2.42%	-3.64%	4.74%
SHAREHOLDERS EQUITY
Retained Earnings	$7.887B	$7.746B	$7.262B
YoY Change	7.58%	6.66%	3.64%
Common Stock	$3.263B	$3.253B	$3.315B
YoY Change	-0.4%	-1.87%	0.27%
Preferred Stock
YoY Change
Treasury Stock (at cost)	$2.736B	$2.606B	$2.558B
YoY Change	12.69%	1.88%	9.04%
Treasury Stock Shares	55.31M shares	53.84M shares	56.10M shares
Shareholders Equity	$7.963B	$8.034B	$7.727B
YoY Change
Total Liabilities & Shareholders Equity	$71.57B	$72.02B	$74.12B
YoY Change	-1.93%	-2.84%	4.38%

Cashflow Statement

Concept	2017 Q4	2017 Q3	2016 Q3
OPERATING ACTIVITIES
Net Income	$326.0M	$226.0M	$149.0M
YoY Change	98.78%	51.68%	9.56%
Depreciation, Depletion And Amortization	$30.00M	$31.00M	$32.00M
YoY Change	0.0%	-3.13%	6.67%
Cash From Operating Activities	$235.0M	$200.0M	$153.0M
YoY Change	164.04%	30.72%	-43.12%
INVESTING ACTIVITIES
Capital Expenditures	-$26.00M	-$16.00M	-$17.00M
YoY Change	8.33%	-5.88%	-29.17%
Acquisitions
YoY Change
Other Investing Activities	$92.00M	$223.0M	$1.090B
YoY Change	19.48%	-79.54%	156.47%
Cash From Investing Activities	$66.00M	$207.0M	$1.073B
YoY Change	24.53%	-80.71%	167.58%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net
YoY Change
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	-660.0M	166.0M	2.704B
YoY Change	-31.54%	-93.86%	378.58%
NET CHANGE
Cash From Operating Activities	235.0M	200.0M	153.0M
Cash From Investing Activities	66.00M	207.0M	1.073B
Cash From Financing Activities	-660.0M	166.0M	2.704B
Net Change In Cash	-359.0M	573.0M	3.930B
YoY Change	-56.33%	-85.42%	218.22%
FREE CASH FLOW
Cash From Operating Activities	$235.0M	$200.0M	$153.0M
Capital Expenditures	-$26.00M	-$16.00M	-$17.00M
Free Cash Flow	$261.0M	$216.0M	$170.0M
YoY Change	130.97%	27.06%	-41.98%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
	us-gaap	Transfer To Other Real Estate TransferToOtherRealEstate	6000000	USD
	us-gaap	Available For Sale Securities Gross Realized Losses AvailableForSaleSecuritiesGrossRealizedLosses	3000000	USD
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.80
	us-gaap	Available For Sale Securities Gross Realized Gains AvailableForSaleSecuritiesGrossRealizedGains	1000000	USD
	us-gaap	Gain Loss On Foreign Currency Fair Value Hedge Derivatives GainLossOnForeignCurrencyFairValueHedgeDerivatives	0	USD
	cma	Accretion Of Discount On Receivables Acquired In Transfer AccretionOfDiscountOnReceivablesAcquiredInTransfer	4000000	USD
	cma	Accretion Of Discount On Receivables Acquired In Transfer AccretionOfDiscountOnReceivablesAcquiredInTransfer	3000000	USD
CY2016Q4	cma	Allowance For Off Balance Sheet Credit Losses AllowanceForOffBalanceSheetCreditLosses	41000000	USD
CY2016Q3	cma	Average Balance During Period Deposits AverageBalanceDuringPeriodDeposits	58065000000	USD
	cma	Average Balance During Period Deposits AverageBalanceDuringPeriodDeposits	57102000000	USD
CY2017Q3	cma	Average Balance During Period Deposits AverageBalanceDuringPeriodDeposits	56493000000	USD
	cma	Average Balance During Period Deposits AverageBalanceDuringPeriodDeposits	57128000000	USD
CY2016Q3	cma	Average Balance During Period Loans And Leases Receivable Net Of Deferred Income AverageBalanceDuringPeriodLoansAndLeasesReceivableNetOfDeferredIncome	49206000000	USD
	cma	Average Balance During Period Loans And Leases Receivable Net Of Deferred Income AverageBalanceDuringPeriodLoansAndLeasesReceivableNetOfDeferredIncome	49023000000	USD
CY2017Q3	cma	Average Balance During Period Loans And Leases Receivable Net Of Deferred Income AverageBalanceDuringPeriodLoansAndLeasesReceivableNetOfDeferredIncome	48663000000	USD
	cma	Average Balance During Period Loans And Leases Receivable Net Of Deferred Income AverageBalanceDuringPeriodLoansAndLeasesReceivableNetOfDeferredIncome	48431000000	USD
CY2016Q4	cma	Carrying Value Of Standby And Commercial Letters Of Credit CarryingValueOfStandbyAndCommercialLettersOfCredit	44000000	USD
CY2017Q3	cma	Carrying Value Of Standby And Commercial Letters Of Credit CarryingValueOfStandbyAndCommercialLettersOfCredit	44000000	USD
CY2016Q4	cma	Carrying Value Of Standby And Commercial Letters Of Credit Included In Allowance For Credit Losses On Lending Related Commitments CarryingValueOfStandbyAndCommercialLettersOfCreditIncludedInAllowanceForCreditLossesOnLendingRelatedCommitments	12000000	USD
CY2017Q3	cma	Carrying Value Of Standby And Commercial Letters Of Credit Included In Allowance For Credit Losses On Lending Related Commitments CarryingValueOfStandbyAndCommercialLettersOfCreditIncludedInAllowanceForCreditLossesOnLendingRelatedCommitments	15000000	USD
CY2016Q4	cma	Carrying Value Of Standby And Commercial Letters Of Credit Included In Deferred Fees CarryingValueOfStandbyAndCommercialLettersOfCreditIncludedInDeferredFees	32000000	USD
CY2017Q3	cma	Carrying Value Of Standby And Commercial Letters Of Credit Included In Deferred Fees CarryingValueOfStandbyAndCommercialLettersOfCreditIncludedInDeferredFees	29000000	USD
CY2016Q4	cma	Carrying Value Of Unused Commitments To Extend Credit CarryingValueOfUnusedCommitmentsToExtendCredit	29000000	USD
CY2017Q3	cma	Carrying Value Of Unused Commitments To Extend Credit CarryingValueOfUnusedCommitmentsToExtendCredit	26000000	USD
CY2017Q3	cma	Cash Collateral Posted For Derivatives In Liability Position CashCollateralPostedForDerivativesInLiabilityPosition	8000000	USD
CY2016Q3	cma	Commercial Lending Fees CommercialLendingFees	26000000	USD
	cma	Commercial Lending Fees CommercialLendingFees	68000000	USD
CY2017Q3	cma	Commercial Lending Fees CommercialLendingFees	21000000	USD
	cma	Commercial Lending Fees CommercialLendingFees	63000000	USD
CY2016Q4	cma	Deposits Customer Certificates Deposits DepositsCustomerCertificatesDeposits	2806000000	USD
CY2017Q3	cma	Deposits Customer Certificates Deposits DepositsCustomerCertificatesDeposits	2342000000	USD
CY2017Q3	cma	Derivative Assets Cash Collateral DerivativeAssetsCashCollateral	20000000	USD
CY2016Q3	cma	Efficiency Ratio EfficiencyRatio	0.6815
	cma	Efficiency Ratio EfficiencyRatio	0.6888
CY2017Q3	cma	Efficiency Ratio EfficiencyRatio	0.5624
	cma	Efficiency Ratio EfficiencyRatio	0.5874
CY2016Q3	cma	Income Loss From Continuing Operations Before Income Taxes IncomeLossFromContinuingOperationsBeforeIncomeTaxes	213000000	USD
	cma	Income Loss From Continuing Operations Before Income Taxes IncomeLossFromContinuingOperationsBeforeIncomeTaxes	444000000	USD
CY2017Q3	cma	Income Loss From Continuing Operations Before Income Taxes IncomeLossFromContinuingOperationsBeforeIncomeTaxes	334000000	USD
	cma	Income Loss From Continuing Operations Before Income Taxes IncomeLossFromContinuingOperationsBeforeIncomeTaxes	904000000	USD
CY2016Q3	cma	Interest And Dividend Income Securities Afs And Htm InterestAndDividendIncomeSecuritiesAFSAndHTM	61000000	USD
	cma	Interest And Dividend Income Securities Afs And Htm InterestAndDividendIncomeSecuritiesAFSAndHTM	185000000	USD
CY2017Q3	cma	Interest And Dividend Income Securities Afs And Htm InterestAndDividendIncomeSecuritiesAFSAndHTM	62000000	USD
	cma	Interest And Dividend Income Securities Afs And Htm InterestAndDividendIncomeSecuritiesAFSAndHTM	186000000	USD
CY2016Q4	cma	Leases Receivable Commercial Lease Financing Net Of Deferred Income LeasesReceivableCommercialLeaseFinancingNetOfDeferredIncome	572000000	USD
CY2017Q3	cma	Leases Receivable Commercial Lease Financing Net Of Deferred Income LeasesReceivableCommercialLeaseFinancingNetOfDeferredIncome	475000000	USD
CY2016Q3	cma	Letter Of Credit Fees LetterOfCreditFees	12000000	USD
	cma	Letter Of Credit Fees LetterOfCreditFees	38000000	USD
CY2017Q3	cma	Letter Of Credit Fees LetterOfCreditFees	11000000	USD
	cma	Letter Of Credit Fees LetterOfCreditFees	34000000	USD
CY2017Q3	cma	Liabilities Secured By Pledged Securities LiabilitiesSecuredByPledgedSecurities	700000000	USD
CY2016Q4	cma	Loans And Leases Receivable Consumer Loans Net Of Deferred Income LoansAndLeasesReceivableConsumerLoansNetOfDeferredIncome	2522000000	USD
CY2017Q3	cma	Loans And Leases Receivable Consumer Loans Net Of Deferred Income LoansAndLeasesReceivableConsumerLoansNetOfDeferredIncome	2511000000	USD
CY2016Q4	cma	Loans And Leases Receivable Consumer Mortgage Net Of Deferred Income LoansAndLeasesReceivableConsumerMortgageNetOfDeferredIncome	1942000000	USD
CY2017Q3	cma	Loans And Leases Receivable Consumer Mortgage Net Of Deferred Income LoansAndLeasesReceivableConsumerMortgageNetOfDeferredIncome	1999000000	USD
CY2016Q4	cma	Loans And Leases Receivable Foreign Net Of Deferred Income Other LoansAndLeasesReceivableForeignNetOfDeferredIncomeOther	1258000000	USD
CY2017Q3	cma	Loans And Leases Receivable Foreign Net Of Deferred Income Other LoansAndLeasesReceivableForeignNetOfDeferredIncomeOther	1159000000	USD
CY2016Q4	cma	Loans Receivable Commercial Financial And Agricultural Net Of Deferred Income LoansReceivableCommercialFinancialAndAgriculturalNetOfDeferredIncome	30994000000	USD
CY2017Q3	cma	Loans Receivable Commercial Financial And Agricultural Net Of Deferred Income LoansReceivableCommercialFinancialAndAgriculturalNetOfDeferredIncome	31062000000	USD
CY2016Q4	cma	Loans Receivable Commercial Mortgage Net Of Deferred Income LoansReceivableCommercialMortgageNetOfDeferredIncome	8931000000	USD
CY2017Q3	cma	Loans Receivable Commercial Mortgage Net Of Deferred Income LoansReceivableCommercialMortgageNetOfDeferredIncome	8985000000	USD
	cma	Longest Expiration Year Letters Of Credit LongestExpirationYearLettersOfCredit	2023
CY2016Q3	cma	Net Credit Related Charge Offs NetCreditRelatedChargeOffs	16000000	USD
	cma	Net Credit Related Charge Offs NetCreditRelatedChargeOffs	121000000	USD
CY2017Q3	cma	Net Credit Related Charge Offs NetCreditRelatedChargeOffs	25000000	USD
	cma	Net Credit Related Charge Offs NetCreditRelatedChargeOffs	76000000	USD
	cma	Net Increase In Fixed Assets NetIncreaseInFixedAssets	71000000	USD
	cma	Net Increase In Fixed Assets NetIncreaseInFixedAssets	43000000	USD
CY2016Q4	cma	Net Unrealized Losses On Available For Sale Securities Transferred To Held To Maturity NetUnrealizedLossesOnAvailableForSaleSecuritiesTransferredToHeldToMaturity	12000000	USD
CY2017Q3	cma	Net Unrealized Losses On Available For Sale Securities Transferred To Held To Maturity NetUnrealizedLossesOnAvailableForSaleSecuritiesTransferredToHeldToMaturity	-9000000	USD
CY2016Q4	cma	Notional Amount Of Derivative Credit Risk Participation Agreements NotionalAmountOfDerivativeCreditRiskParticipationAgreements	458000000	USD
CY2017Q3	cma	Notional Amount Of Derivative Credit Risk Participation Agreements NotionalAmountOfDerivativeCreditRiskParticipationAgreements	544000000	USD
	cma	Number Of Geographic Markets NumberOfGeographicMarkets	3	markets
	cma	Number Of Major Business Segments NumberOfMajorBusinessSegments	3	segments
	cma	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Amortization Of Unrealized Losses On Afs Securities Transferred To Htm Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForAmortizationOfUnrealizedLossesOnAFSSecuritiesTransferredToHTMBeforeTax	-2000000	USD
	cma	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Amortization Of Unrealized Losses On Afs Securities Transferred To Htm Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForAmortizationOfUnrealizedLossesOnAFSSecuritiesTransferredToHTMBeforeTax	-3000000	USD
	cma	Other Comprehensive Income Loss Reclassification Adjustment Pension And Other Postretirement Benefit Plans Recognized In Net Periodic Defined Benefit Cost Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentPensionAndOtherPostretirementBenefitPlansRecognizedInNetPeriodicDefinedBenefitCostBeforeTax	29000000	USD
	cma	Other Comprehensive Income Loss Reclassification Adjustment Pension And Other Postretirement Benefit Plans Recognized In Net Periodic Defined Benefit Cost Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentPensionAndOtherPostretirementBenefitPlansRecognizedInNetPeriodicDefinedBenefitCostBeforeTax	18000000	USD
	cma	Other Comprehensive Income Loss Reclassification Adjustment Pension And Other Postretirement Benefit Plans Recognized In Net Periodic Defined Benefit Cost Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentPensionAndOtherPostretirementBenefitPlansRecognizedInNetPeriodicDefinedBenefitCostNetOfTax	19000000	USD
	cma	Other Comprehensive Income Loss Reclassification Adjustment Pension And Other Postretirement Benefit Plans Recognized In Net Periodic Defined Benefit Cost Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentPensionAndOtherPostretirementBenefitPlansRecognizedInNetPeriodicDefinedBenefitCostNetOfTax	11000000	USD
	cma	Other Comprehensive Income Loss Reclassification Adjustment Pension And Other Postretirement Benefit Plans Recognized In Net Periodic Defined Benefit Cost Tax OtherComprehensiveIncomeLossReclassificationAdjustmentPensionAndOtherPostretirementBenefitPlansRecognizedInNetPeriodicDefinedBenefitCostTax	10000000	USD
	cma	Other Comprehensive Income Loss Reclassification Adjustment Pension And Other Postretirement Benefit Plans Recognized In Net Periodic Defined Benefit Cost Tax OtherComprehensiveIncomeLossReclassificationAdjustmentPensionAndOtherPostretirementBenefitPlansRecognizedInNetPeriodicDefinedBenefitCostTax	7000000	USD
	cma	Other Comprehensive Income Loss Reclassification From Aoci For Amortization Of Yield Adjustment Tax OtherComprehensiveIncomeLossReclassificationFromAOCIForAmortizationOfYieldAdjustmentTax	-1000000	USD
	cma	Other Comprehensive Income Loss Reclassification From Aoci For Amortization Of Yield Adjustment Tax OtherComprehensiveIncomeLossReclassificationFromAOCIForAmortizationOfYieldAdjustmentTax	-1000000	USD
	cma	Other Comprehensiveincome Loss Reclassification Adjustment From Aoci For Amortization Of Unrealized Gains Losses On Securities Transferred From Available For Sale To Held To Maturity Net Of Tax OtherComprehensiveincomeLossReclassificationAdjustmentFromAOCIForAmortizationOfUnrealizedGainsLossesOnSecuritiesTransferredFromAvailableForSaleToHeldToMaturityNetOfTax	-1000000	USD
	cma	Other Comprehensiveincome Loss Reclassification Adjustment From Aoci For Amortization Of Unrealized Gains Losses On Securities Transferred From Available For Sale To Held To Maturity Net Of Tax OtherComprehensiveincomeLossReclassificationAdjustmentFromAOCIForAmortizationOfUnrealizedGainsLossesOnSecuritiesTransferredFromAvailableForSaleToHeldToMaturityNetOfTax	-2000000	USD
CY2016Q3	cma	Outside Processing Fee Expense OutsideProcessingFeeExpense	86000000	USD
	cma	Outside Processing Fee Expense OutsideProcessingFeeExpense	247000000	USD
CY2017Q3	cma	Outside Processing Fee Expense OutsideProcessingFeeExpense	92000000	USD
	cma	Outside Processing Fee Expense OutsideProcessingFeeExpense	267000000	USD
CY2016Q4	cma	Real Estate Construction Loans Net Of Deferred Income RealEstateConstructionLoansNetOfDeferredIncome	2869000000	USD
CY2017Q3	cma	Real Estate Construction Loans Net Of Deferred Income RealEstateConstructionLoansNetOfDeferredIncome	3018000000	USD
CY2016Q4	cma	Reduced Rate Loans ReducedRateLoans	8000000	USD
CY2017Q3	cma	Reduced Rate Loans ReducedRateLoans	8000000	USD
CY2017Q3	cma	Restructuring And Related Cost Expected Numberof Banking Center Consolidations RestructuringAndRelatedCostExpectedNumberofBankingCenterConsolidations	38
CY2016Q3	cma	Return On Average Assets ReturnOnAverageAssets	0.0082
	cma	Return On Average Assets ReturnOnAverageAssets	0.0059
CY2017Q3	cma	Return On Average Assets ReturnOnAverageAssets	0.0125
	cma	Return On Average Assets ReturnOnAverageAssets	0.0118
CY2016Q4	cma	Risk Participations Covering Standby And Commercial Letters Of Credit RiskParticipationsCoveringStandbyAndCommercialLettersOfCredit	255000000	USD
CY2017Q3	cma	Risk Participations Covering Standby And Commercial Letters Of Credit RiskParticipationsCoveringStandbyAndCommercialLettersOfCredit	208000000	USD
CY2016Q3	cma	Segment Reporting Average Assets SegmentReportingAverageAssets	72909000000	USD
	cma	Segment Reporting Average Assets SegmentReportingAverageAssets	70942000000	USD
CY2017Q3	cma	Segment Reporting Average Assets SegmentReportingAverageAssets	71251000000	USD
	cma	Segment Reporting Average Assets SegmentReportingAverageAssets	71470000000	USD
CY2016Q3	cma	Software Expenses SoftwareExpenses	31000000	USD
	cma	Software Expenses SoftwareExpenses	90000000	USD
CY2017Q3	cma	Software Expenses SoftwareExpenses	35000000	USD
	cma	Software Expenses SoftwareExpenses	95000000	USD
	cma	Stock Issued During Period Value Warrants Exercised StockIssuedDuringPeriodValueWarrantsExercised	0	USD
CY2016Q4	cma	Total Internally Classified Watch List Letters Of Credit TotalInternallyClassifiedWatchListLettersOfCredit	135000000	USD
CY2017Q3	cma	Total Internally Classified Watch List Letters Of Credit TotalInternallyClassifiedWatchListLettersOfCredit	79000000	USD
CY2016Q4	cma	Total Nonperforming Assets TotalNonperformingAssets	607000000	USD
CY2017Q3	cma	Total Nonperforming Assets TotalNonperformingAssets	458000000	USD
CY2016Q4	cma	Total Nonperforming Loans TotalNonperformingLoans	590000000	USD
CY2017Q3	cma	Total Nonperforming Loans TotalNonperformingLoans	452000000	USD
CY2016Q4	cma	Watch List Letters Of Credit As Percentage Of Total Letters Of Credit WatchListLettersOfCreditAsPercentageOfTotalLettersOfCredit	0.037
CY2017Q3	cma	Watch List Letters Of Credit As Percentage Of Total Letters Of Credit WatchListLettersOfCreditAsPercentageOfTotalLettersOfCredit	0.023
	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	2017
	dei	Document Period End Date DocumentPeriodEndDate	2017-09-30
	dei	Document Type DocumentType	10-Q
	dei	Entity Central Index Key EntityCentralIndexKey	0000028412
CY2017Q4	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	173915038	shares
	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
	dei	Entity Registrant Name EntityRegistrantName	Comerica INC /NEW/
	dei	Entity Voluntary Filers EntityVoluntaryFilers	No
	dei	Entity Well Known Seasoned Issuer EntityWellKnownSeasonedIssuer	Yes
CY2016Q4	invest	Derivative Notional Amount DerivativeNotionalAmount	20051000000	USD
CY2017Q3	invest	Derivative Notional Amount DerivativeNotionalAmount	20466000000	USD
	us-gaap	Accretion Amortization Of Discounts And Premiums Investments AccretionAmortizationOfDiscountsAndPremiumsInvestments	-7000000	USD
	us-gaap	Accretion Amortization Of Discounts And Premiums Investments AccretionAmortizationOfDiscountsAndPremiumsInvestments	-5000000	USD
CY2015Q4	us-gaap	Accumulated Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	9000000	USD
CY2016Q3	us-gaap	Accumulated Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	99000000	USD
CY2016Q4	us-gaap	Accumulated Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	-33000000	USD
CY2017Q3	us-gaap	Accumulated Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	-20000000	USD
CY2015Q4	us-gaap	Accumulated Other Comprehensive Income Loss Defined Benefit Pension And Other Postretirement Plans Net Of Tax AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax	-438000000	USD
CY2016Q3	us-gaap	Accumulated Other Comprehensive Income Loss Defined Benefit Pension And Other Postretirement Plans Net Of Tax AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax	-391000000	USD
CY2016Q4	us-gaap	Accumulated Other Comprehensive Income Loss Defined Benefit Pension And Other Postretirement Plans Net Of Tax AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax	-350000000	USD
CY2017Q3	us-gaap	Accumulated Other Comprehensive Income Loss Defined Benefit Pension And Other Postretirement Plans Net Of Tax AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax	-339000000	USD
CY2016Q3	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-292000000	USD
CY2016Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-383000000	USD
CY2017Q3	us-gaap	Decrease In Unrecognized Tax Benefits Is Reasonably Possible DecreaseInUnrecognizedTaxBenefitsIsReasonablyPossible	1000000	USD
CY2017Q3	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-359000000	USD
CY2016Q4	us-gaap	Additional Paid In Capital Common Stock AdditionalPaidInCapitalCommonStock	2135000000	USD
CY2017Q3	us-gaap	Additional Paid In Capital Common Stock AdditionalPaidInCapitalCommonStock	2112000000	USD
	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	30000000	USD
	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	29000000	USD
CY2016Q3	us-gaap	Advertising Expense AdvertisingExpense	5000000	USD
	us-gaap	Advertising Expense AdvertisingExpense	15000000	USD
CY2017Q3	us-gaap	Advertising Expense AdvertisingExpense	8000000	USD
	us-gaap	Advertising Expense AdvertisingExpense	19000000	USD
CY2016Q4	us-gaap	Assets Assets	72978000000	USD
CY2017Q3	us-gaap	Assets Assets	72017000000	USD
CY2017Q3	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	10936000000	USD
CY2016Q4	us-gaap	Available For Sale Securities AvailableForSaleSecurities	10787000000	USD
CY2017Q3	us-gaap	Available For Sale Securities AvailableForSaleSecurities	10998000000	USD
CY2016Q4	us-gaap	Available For Sale Securities Accumulated Gross Unrealized Gain Before Tax AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax	57000000	USD
CY2017Q3	us-gaap	Available For Sale Securities Accumulated Gross Unrealized Gain Before Tax AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax	54000000	USD
CY2016Q4	us-gaap	Available For Sale Securities Accumulated Gross Unrealized Loss Before Tax AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax	99000000	USD
CY2017Q3	us-gaap	Available For Sale Securities Accumulated Gross Unrealized Loss Before Tax AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax	78000000	USD
CY2016Q4	us-gaap	Available For Sale Securities Amortized Cost AvailableForSaleSecuritiesAmortizedCost	10829000000	USD
CY2017Q3	us-gaap	Available For Sale Securities Amortized Cost AvailableForSaleSecuritiesAmortizedCost	11022000000	USD
CY2016Q4	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position12 Months Or Longer Accumulated Loss AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss	32000000	USD
CY2017Q3	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position12 Months Or Longer Accumulated Loss AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss	38000000	USD
CY2016Q4	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Accumulated Loss AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLoss	120000000	USD
CY2017Q3	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Accumulated Loss AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLoss	94000000	USD
CY2016Q4	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Fair Value AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue	6750000000	USD
CY2017Q3	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Fair Value AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue	6093000000	USD
CY2016Q4	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Less Than12 Months Accumulated Loss AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss	88000000	USD
CY2017Q3	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Less Than12 Months Accumulated Loss AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss	56000000	USD
CY2016Q4	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Less Than Twelve Months Fair Value AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue	5555000000	USD
CY2017Q3	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Less Than Twelve Months Fair Value AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue	4597000000	USD
CY2016Q4	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or Longer Fair Value AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue	1195000000	USD
CY2017Q3	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or Longer Fair Value AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue	1496000000	USD
CY2017Q3	us-gaap	Available For Sale Securities Debt Maturities Next Rolling Twelve Months Amortized Cost Basis AvailableForSaleSecuritiesDebtMaturitiesNextRollingTwelveMonthsAmortizedCostBasis	20000000	USD
CY2017Q3	us-gaap	Available For Sale Securities Debt Maturities Next Rolling Twelve Months Fair Value AvailableForSaleSecuritiesDebtMaturitiesNextRollingTwelveMonthsFairValue	20000000	USD
CY2017Q3	us-gaap	Available For Sale Securities Debt Maturities Rolling After Year Ten Amortized Cost Basis AvailableForSaleSecuritiesDebtMaturitiesRollingAfterYearTenAmortizedCostBasis	6225000000	USD
CY2017Q3	us-gaap	Available For Sale Securities Debt Maturities Rolling After Year Ten Fair Value AvailableForSaleSecuritiesDebtMaturitiesRollingAfterYearTenFairValue	6169000000	USD
CY2017Q3	us-gaap	Available For Sale Securities Debt Maturities Rolling Year Six Through Ten Amortized Cost Basis AvailableForSaleSecuritiesDebtMaturitiesRollingYearSixThroughTenAmortizedCostBasis	1744000000	USD
CY2017Q3	us-gaap	Available For Sale Securities Debt Maturities Rolling Year Six Through Ten Fair Value AvailableForSaleSecuritiesDebtMaturitiesRollingYearSixThroughTenFairValue	1770000000	USD
CY2017Q3	us-gaap	Available For Sale Securities Debt Maturities Rolling Year Two Through Five Amortized Cost Basis AvailableForSaleSecuritiesDebtMaturitiesRollingYearTwoThroughFiveAmortizedCostBasis	2947000000	USD
CY2017Q3	us-gaap	Available For Sale Securities Debt Maturities Rolling Year Two Through Five Fair Value AvailableForSaleSecuritiesDebtMaturitiesRollingYearTwoThroughFiveFairValue	2953000000	USD
CY2017Q3	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	10912000000	USD
CY2016Q3	us-gaap	Available For Sale Securities Gross Realized Gains AvailableForSaleSecuritiesGrossRealizedGains	0	USD
	us-gaap	Available For Sale Securities Gross Realized Gains AvailableForSaleSecuritiesGrossRealizedGains	0	USD
CY2017Q3	us-gaap	Available For Sale Securities Gross Realized Gains AvailableForSaleSecuritiesGrossRealizedGains	0	USD
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	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-48000000	USD
CY2016Q3	us-gaap	Available For Sale Securities Gross Realized Losses AvailableForSaleSecuritiesGrossRealizedLosses	0	USD
CY2017Q3	us-gaap	Available For Sale Securities Gross Realized Losses AvailableForSaleSecuritiesGrossRealizedLosses	1000000	USD
	us-gaap	Available For Sale Securities Gross Realized Losses AvailableForSaleSecuritiesGrossRealizedLosses	4000000	USD
CY2017Q3	us-gaap	Available For Sale Securities Pledged As Collateral AvailableForSaleSecuritiesPledgedAsCollateral	950000000	USD
CY2017Q3	us-gaap	Availableforsale Securities In Unrealized Loss Positions Qualitative Disclosure Number Of Positions1 AvailableforsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions1	240	Security
	us-gaap	Average Term Of Credit Risk Derivatives1 AverageTermOfCreditRiskDerivatives1	P2Y4M6D
CY2016Q3	us-gaap	Bank Owned Life Insurance Income BankOwnedLifeInsuranceIncome	12000000	USD
	us-gaap	Bank Owned Life Insurance Income BankOwnedLifeInsuranceIncome	30000000	USD
CY2017Q3	us-gaap	Bank Owned Life Insurance Income BankOwnedLifeInsuranceIncome	12000000	USD
	us-gaap	Bank Owned Life Insurance Income BankOwnedLifeInsuranceIncome	31000000	USD
CY2016Q3	us-gaap	Brokerage Commissions Revenue BrokerageCommissionsRevenue	5000000	USD
	us-gaap	Brokerage Commissions Revenue BrokerageCommissionsRevenue	14000000	USD
CY2017Q3	us-gaap	Brokerage Commissions Revenue BrokerageCommissionsRevenue	6000000	USD
	us-gaap	Brokerage Commissions Revenue BrokerageCommissionsRevenue	17000000	USD
CY2015Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	6147000000	USD
CY2016Q3	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	8040000000	USD
CY2016Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	7218000000	USD
CY2017Q3	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	6204000000	USD
	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	1893000000	USD
	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	-1014000000	USD
CY2016Q4	us-gaap	Cash And Due From Banks CashAndDueFromBanks	1249000000	USD
CY2017Q3	us-gaap	Cash And Due From Banks CashAndDueFromBanks	1351000000	USD
CY2016Q3	us-gaap	Change In Unrealized Gain Loss On Fair Value Hedging Instruments1 ChangeInUnrealizedGainLossOnFairValueHedgingInstruments1	15000000	USD
	us-gaap	Change In Unrealized Gain Loss On Fair Value Hedging Instruments1 ChangeInUnrealizedGainLossOnFairValueHedgingInstruments1	48000000	USD
CY2017Q3	us-gaap	Change In Unrealized Gain Loss On Fair Value Hedging Instruments1 ChangeInUnrealizedGainLossOnFairValueHedgingInstruments1	7000000	USD
	us-gaap	Change In Unrealized Gain Loss On Fair Value Hedging Instruments1 ChangeInUnrealizedGainLossOnFairValueHedgingInstruments1	27000000	USD
CY2016Q3	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.23
	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.66
CY2017Q3	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.30
	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.79
CY2016Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	5
CY2017Q3	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	5
CY2016Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	325000000	shares
CY2017Q3	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	325000000	shares
CY2016Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	228164824	shares
CY2017Q3	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	228164824	shares
CY2016Q4	us-gaap	Common Stock Value CommonStockValue	1141000000	USD
CY2017Q3	us-gaap	Common Stock Value CommonStockValue	1141000000	USD
CY2016Q3	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	152000000	USD
	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	450000000	USD
CY2017Q3	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	228000000	USD
	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	655000000	USD
CY2016Q4	us-gaap	Credit Derivative Maximum Exposure Undiscounted CreditDerivativeMaximumExposureUndiscounted	3000000	USD
CY2017Q3	us-gaap	Credit Derivative Maximum Exposure Undiscounted CreditDerivativeMaximumExposureUndiscounted	1000000	USD
CY2016Q4	us-gaap	Deferred Tax Assets Liabilities Net DeferredTaxAssetsLiabilitiesNet	217000000	USD
CY2017Q3	us-gaap	Deferred Tax Assets Liabilities Net DeferredTaxAssetsLiabilitiesNet	252000000	USD
CY2016Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards State And Local DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal	4000000	USD
CY2017Q3	us-gaap	Deferred Tax Assets Operating Loss Carryforwards State And Local DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal	4000000	USD
CY2016Q3	us-gaap	Gain Loss On Interest Rate Fair Value Hedge Ineffectiveness GainLossOnInterestRateFairValueHedgeIneffectiveness	-1000000	USD
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CY2016Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	3000000	USD
CY2017Q3	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	3000000	USD
	us-gaap	Defined Benefit Plan Net Periodic Benefit Cost DefinedBenefitPlanNetPeriodicBenefitCost	11000000	USD
	us-gaap	Defined Benefit Plan Net Periodic Benefit Cost DefinedBenefitPlanNetPeriodicBenefitCost	-14000000	USD
CY2016Q4	us-gaap	Deposits Deposits	58985000000	USD
CY2017Q3	us-gaap	Deposits Deposits	57819000000	USD
CY2016Q4	us-gaap	Deposits Money Market Deposits And Negotiable Order Of Withdrawal Now DepositsMoneyMarketDepositsAndNegotiableOrderOfWithdrawalNOW	22556000000	USD
CY2017Q3	us-gaap	Deposits Money Market Deposits And Negotiable Order Of Withdrawal Now DepositsMoneyMarketDepositsAndNegotiableOrderOfWithdrawalNOW	20869000000	USD
CY2016Q4	us-gaap	Deposits Savings Deposits DepositsSavingsDeposits	2064000000	USD
CY2017Q3	us-gaap	Deposits Savings Deposits DepositsSavingsDeposits	2147000000	USD
	us-gaap	Depreciation And Amortization DepreciationAndAmortization	91000000	USD
	us-gaap	Depreciation And Amortization DepreciationAndAmortization	91000000	USD
CY2016Q4	us-gaap	Derivative Asset Collateral Obligation To Return Cash Offset DerivativeAssetCollateralObligationToReturnCashOffset	47000000	USD
CY2017Q3	us-gaap	Derivative Asset Collateral Obligation To Return Cash Offset DerivativeAssetCollateralObligationToReturnCashOffset	19000000	USD
CY2016Q4	us-gaap	Derivative Asset Fair Value Gross Liability DerivativeAssetFairValueGrossLiability	84000000	USD
CY2017Q3	us-gaap	Derivative Asset Fair Value Gross Liability DerivativeAssetFairValueGrossLiability	49000000	USD
CY2017Q3	us-gaap	Derivative Asset Fair Value Of Collateral DerivativeAssetFairValueOfCollateral	26000000	USD
CY2016Q4	us-gaap	Derivative Assets DerivativeAssets	276000000	USD
CY2017Q3	us-gaap	Derivative Assets DerivativeAssets	120000000	USD
CY2016Q4	us-gaap	Derivative Collateral Obligation To Return Securities DerivativeCollateralObligationToReturnSecurities	19000000	USD
CY2017Q3	us-gaap	Derivative Collateral Obligation To Return Securities DerivativeCollateralObligationToReturnSecurities	4000000	USD
CY2016Q4	us-gaap	Derivative Collateral Right To Reclaim Securities DerivativeCollateralRightToReclaimSecurities	8000000	USD
CY2017Q3	us-gaap	Derivative Collateral Right To Reclaim Securities DerivativeCollateralRightToReclaimSecurities	24000000	USD
CY2016Q4	us-gaap	Derivative Credit Risk Valuation Adjustment Derivative Assets DerivativeCreditRiskValuationAdjustmentDerivativeAssets	5000000	USD
CY2017Q3	us-gaap	Derivative Credit Risk Valuation Adjustment Derivative Assets DerivativeCreditRiskValuationAdjustmentDerivativeAssets	6000000	USD
CY2016Q4	us-gaap	Derivative Fair Value Of Derivative Asset DerivativeFairValueOfDerivativeAsset	407000000	USD
CY2017Q3	us-gaap	Derivative Fair Value Of Derivative Asset DerivativeFairValueOfDerivativeAsset	188000000	USD
CY2016Q4	us-gaap	Derivative Fair Value Of Derivative Asset Amount Offset Against Collateral DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCollateral	257000000	USD
CY2017Q3	us-gaap	Derivative Fair Value Of Derivative Asset Amount Offset Against Collateral DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCollateral	116000000	USD
CY2016Q4	us-gaap	Derivative Fair Value Of Derivative Liability DerivativeFairValueOfDerivativeLiability	254000000	USD
CY2017Q3	us-gaap	Derivative Fair Value Of Derivative Liability DerivativeFairValueOfDerivativeLiability	149000000	USD
CY2016Q4	us-gaap	Derivative Fair Value Of Derivative Liability Amount Offset Against Collateral DerivativeFairValueOfDerivativeLiabilityAmountOffsetAgainstCollateral	117000000	USD
CY2017Q3	us-gaap	Derivative Fair Value Of Derivative Liability Amount Offset Against Collateral DerivativeFairValueOfDerivativeLiabilityAmountOffsetAgainstCollateral	70000000	USD
CY2016Q4	us-gaap	Derivative Liabilities DerivativeLiabilities	125000000	USD
CY2017Q3	us-gaap	Derivative Liabilities DerivativeLiabilities	94000000	USD
CY2016Q4	us-gaap	Derivative Liability Collateral Right To Reclaim Cash Offset DerivativeLiabilityCollateralRightToReclaimCashOffset	45000000	USD
CY2017Q3	us-gaap	Derivative Liability Collateral Right To Reclaim Cash Offset DerivativeLiabilityCollateralRightToReclaimCashOffset	6000000	USD
CY2016Q4	us-gaap	Derivative Liability Fair Value Gross Asset DerivativeLiabilityFairValueGrossAsset	84000000	USD
CY2017Q3	us-gaap	Derivative Liability Fair Value Gross Asset DerivativeLiabilityFairValueGrossAsset	49000000	USD
CY2017Q3	us-gaap	Derivative Liability Fair Value Of Collateral DerivativeLiabilityFairValueOfCollateral	4000000	USD
CY2017Q3	us-gaap	Derivative Net Liability Position Aggregate Fair Value DerivativeNetLiabilityPositionAggregateFairValue	0	USD
CY2016Q3	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	40000000	USD
	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	115000000	USD
CY2017Q3	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	53000000	USD
	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	141000000	USD
CY2016Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.87
CY2017Q3	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
CY2017Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.29
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	3.58
CY2016Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.84
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.76
CY2017Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.26
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	3.50
CY2016Q3	us-gaap	Equipment Expense EquipmentExpense	13000000	USD
	us-gaap	Equipment Expense EquipmentExpense	40000000	USD
CY2017Q3	us-gaap	Equipment Expense EquipmentExpense	12000000	USD
	us-gaap	Equipment Expense EquipmentExpense	34000000	USD
CY2016Q3	us-gaap	Federal Deposit Insurance Corporation Premium Expense FederalDepositInsuranceCorporationPremiumExpense	14000000	USD
	us-gaap	Federal Deposit Insurance Corporation Premium Expense FederalDepositInsuranceCorporationPremiumExpense	39000000	USD
CY2017Q3	us-gaap	Federal Deposit Insurance Corporation Premium Expense FederalDepositInsuranceCorporationPremiumExpense	13000000	USD
	us-gaap	Federal Deposit Insurance Corporation Premium Expense FederalDepositInsuranceCorporationPremiumExpense	38000000	USD
CY2016Q3	us-gaap	Fees And Commissions Credit And Debit Cards FeesAndCommissionsCreditAndDebitCards	76000000	USD
	us-gaap	Fees And Commissions Credit And Debit Cards FeesAndCommissionsCreditAndDebitCards	224000000	USD
CY2017Q3	us-gaap	Fees And Commissions Credit And Debit Cards FeesAndCommissionsCreditAndDebitCards	85000000	USD
	us-gaap	Fees And Commissions Credit And Debit Cards FeesAndCommissionsCreditAndDebitCards	242000000	USD
CY2016Q3	us-gaap	Fees And Commissions Depositor Accounts FeesAndCommissionsDepositorAccounts	55000000	USD
	us-gaap	Fees And Commissions Depositor Accounts FeesAndCommissionsDepositorAccounts	165000000	USD
CY2017Q3	us-gaap	Fees And Commissions Depositor Accounts FeesAndCommissionsDepositorAccounts	57000000	USD
	us-gaap	Fees And Commissions Depositor Accounts FeesAndCommissionsDepositorAccounts	172000000	USD
CY2016Q3	us-gaap	Fees And Commissions Fiduciary And Trust Activities FeesAndCommissionsFiduciaryAndTrustActivities	47000000	USD
	us-gaap	Fees And Commissions Fiduciary And Trust Activities FeesAndCommissionsFiduciaryAndTrustActivities	142000000	USD
CY2017Q3	us-gaap	Fees And Commissions Fiduciary And Trust Activities FeesAndCommissionsFiduciaryAndTrustActivities	48000000	USD
	us-gaap	Fees And Commissions Fiduciary And Trust Activities FeesAndCommissionsFiduciaryAndTrustActivities	148000000	USD
CY2016Q3	us-gaap	Financing Receivable Modifications Post Modification Recorded Investment2 FinancingReceivableModificationsPostModificationRecordedInvestment2	110000000	USD
	us-gaap	Financing Receivable Modifications Post Modification Recorded Investment2 FinancingReceivableModificationsPostModificationRecordedInvestment2	206000000	USD
CY2017Q3	us-gaap	Financing Receivable Modifications Post Modification Recorded Investment2 FinancingReceivableModificationsPostModificationRecordedInvestment2	61000000	USD
	us-gaap	Financing Receivable Modifications Post Modification Recorded Investment2 FinancingReceivableModificationsPostModificationRecordedInvestment2	170000000	USD
CY2016Q4	us-gaap	Financing Receivable Recorded Investment Current FinancingReceivableRecordedInvestmentCurrent	48358000000	USD
CY2017Q3	us-gaap	Financing Receivable Recorded Investment Current FinancingReceivableRecordedInvestmentCurrent	48569000000	USD
CY2016Q4	us-gaap	Financing Receivable Recorded Investment Past Due FinancingReceivableRecordedInvestmentPastDue	148000000	USD
CY2017Q3	us-gaap	Financing Receivable Recorded Investment Past Due FinancingReceivableRecordedInvestmentPastDue	196000000	USD
CY2016Q4	us-gaap	Foreclosed Assets ForeclosedAssets	17000000	USD
CY2017Q3	us-gaap	Foreclosed Assets ForeclosedAssets	6000000	USD
CY2016Q3	us-gaap	Foreign Currency Transaction Gain Loss Before Tax ForeignCurrencyTransactionGainLossBeforeTax	10000000	USD
	us-gaap	Foreign Currency Transaction Gain Loss Before Tax ForeignCurrencyTransactionGainLossBeforeTax	31000000	USD
CY2017Q3	us-gaap	Foreign Currency Transaction Gain Loss Before Tax ForeignCurrencyTransactionGainLossBeforeTax	11000000	USD
	us-gaap	Foreign Currency Transaction Gain Loss Before Tax ForeignCurrencyTransactionGainLossBeforeTax	33000000	USD
CY2016Q3	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	1000000	USD
CY2016Q3	us-gaap	Gain Loss On Foreign Currency Fair Value Hedge Derivatives GainLossOnForeignCurrencyFairValueHedgeDerivatives	0	USD
CY2017Q3	us-gaap	Gain Loss On Foreign Currency Fair Value Hedge Derivatives GainLossOnForeignCurrencyFairValueHedgeDerivatives	0	USD
CY2017Q3	us-gaap	Gain Loss On Interest Rate Fair Value Hedge Ineffectiveness GainLossOnInterestRateFairValueHedgeIneffectiveness	0	USD
	us-gaap	Gain Loss On Interest Rate Fair Value Hedge Ineffectiveness GainLossOnInterestRateFairValueHedgeIneffectiveness	0	USD
	us-gaap	Gain Loss On Sale Of Other Assets GainLossOnSaleOfOtherAssets	3000000	USD
	us-gaap	Gain Loss On Sale Of Other Assets GainLossOnSaleOfOtherAssets	2000000	USD
CY2016Q3	us-gaap	Gain Loss On Sale Of Securities Net GainLossOnSaleOfSecuritiesNet	0	USD
	us-gaap	Gain Loss On Sale Of Securities Net GainLossOnSaleOfSecuritiesNet	-3000000	USD
CY2017Q3	us-gaap	Gain Loss On Sale Of Securities Net GainLossOnSaleOfSecuritiesNet	-1000000	USD
	us-gaap	Gain Loss On Sale Of Securities Net GainLossOnSaleOfSecuritiesNet	-3000000	USD
CY2016Q4	us-gaap	Held To Maturity Securities HeldToMaturitySecurities	1582000000	USD
CY2017Q3	us-gaap	Held To Maturity Securities HeldToMaturitySecurities	1344000000	USD
CY2017Q3	us-gaap	Held To Maturity Securities Debt Maturities Next Rolling Twelve Months Fair Value HeldToMaturitySecuritiesDebtMaturitiesNextRollingTwelveMonthsFairValue	0	USD
CY2017Q3	us-gaap	Held To Maturity Securities Debt Maturities Rolling After Ten Years Fair Value HeldToMaturitySecuritiesDebtMaturitiesRollingAfterTenYearsFairValue	1320000000	USD
CY2017Q3	us-gaap	Held To Maturity Securities Debt Maturities Rolling Year Six Through Ten Fair Value HeldToMaturitySecuritiesDebtMaturitiesRollingYearSixThroughTenFairValue	19000000	USD
CY2017Q3	us-gaap	Held To Maturity Securities Debt Maturities Rolling Year Two Through Five Fair Value HeldToMaturitySecuritiesDebtMaturitiesRollingYearTwoThroughFiveFairValue	0	USD
CY2017Q3	us-gaap	Held To Maturity Securities Fair Value HeldToMaturitySecuritiesFairValue	1339000000	USD
CY2017Q3	us-gaap	Heldtomaturity Securities Debt Maturities Next Rolling Twelve Months Amortized Cost HeldtomaturitySecuritiesDebtMaturitiesNextRollingTwelveMonthsAmortizedCost	0	USD
CY2017Q3	us-gaap	Heldtomaturity Securities Debt Maturities Rolling After Ten Years Amortized Cost HeldtomaturitySecuritiesDebtMaturitiesRollingAfterTenYearsAmortizedCost	1325000000	USD
CY2017Q3	us-gaap	Heldtomaturity Securities Debt Maturities Rolling Year Six Through Ten Amortized Cost HeldtomaturitySecuritiesDebtMaturitiesRollingYearSixThroughTenAmortizedCost	19000000	USD
CY2017Q3	us-gaap	Heldtomaturity Securities Debt Maturities Rolling Year Two Through Five Amortized Cost HeldtomaturitySecuritiesDebtMaturitiesRollingYearTwoThroughFiveAmortizedCost	0	USD
CY2016Q3	us-gaap	Impaired Financing Receivable Average Recorded Investment ImpairedFinancingReceivableAverageRecordedInvestment	689000000	USD
	us-gaap	Impaired Financing Receivable Average Recorded Investment ImpairedFinancingReceivableAverageRecordedInvestment	646000000	USD
CY2017Q3	us-gaap	Impaired Financing Receivable Average Recorded Investment ImpairedFinancingReceivableAverageRecordedInvestment	544000000	USD
	us-gaap	Impaired Financing Receivable Average Recorded Investment ImpairedFinancingReceivableAverageRecordedInvestment	570000000	USD
CY2016Q3	us-gaap	Impaired Financing Receivable Interest Income Accrual Method ImpairedFinancingReceivableInterestIncomeAccrualMethod	2000000	USD
	us-gaap	Impaired Financing Receivable Interest Income Accrual Method ImpairedFinancingReceivableInterestIncomeAccrualMethod	8000000	USD
CY2017Q3	us-gaap	Impaired Financing Receivable Interest Income Accrual Method ImpairedFinancingReceivableInterestIncomeAccrualMethod	3000000	USD
	us-gaap	Impaired Financing Receivable Interest Income Accrual Method ImpairedFinancingReceivableInterestIncomeAccrualMethod	7000000	USD
CY2016Q4	us-gaap	Impaired Financing Receivable Recorded Investment ImpairedFinancingReceivableRecordedInvestment	614000000	USD
CY2017Q3	us-gaap	Impaired Financing Receivable Recorded Investment ImpairedFinancingReceivableRecordedInvestment	538000000	USD
CY2016Q4	us-gaap	Impaired Financing Receivable Related Allowance ImpairedFinancingReceivableRelatedAllowance	89000000	USD
CY2017Q3	us-gaap	Impaired Financing Receivable Related Allowance ImpairedFinancingReceivableRelatedAllowance	90000000	USD
CY2016Q4	us-gaap	Impaired Financing Receivable Unpaid Principal Balance ImpairedFinancingReceivableUnpaidPrincipalBalance	738000000	USD
CY2017Q3	us-gaap	Impaired Financing Receivable Unpaid Principal Balance ImpairedFinancingReceivableUnpaidPrincipalBalance	693000000	USD
CY2016Q4	us-gaap	Impaired Financing Receivable With No Related Allowance Recorded Investment ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment	131000000	USD
CY2017Q3	us-gaap	Impaired Financing Receivable With No Related Allowance Recorded Investment ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment	187000000	USD
CY2016Q4	us-gaap	Impaired Financing Receivable With Related Allowance Recorded Investment ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment	483000000	USD
CY2017Q3	us-gaap	Impaired Financing Receivable With Related Allowance Recorded Investment ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment	351000000	USD
CY2016Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	64000000	USD
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	131000000	USD
CY2017Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	108000000	USD
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	273000000	USD
	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	111000000	USD
	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	247000000	USD
	us-gaap	Increase Decrease In Accrued Liabilities IncreaseDecreaseInAccruedLiabilities	71000000	USD
	us-gaap	Increase Decrease In Accrued Liabilities IncreaseDecreaseInAccruedLiabilities	28000000	USD
	us-gaap	Increase Decrease In Deferred Income Taxes IncreaseDecreaseInDeferredIncomeTaxes	35000000	USD
	us-gaap	Increase Decrease In Deposits IncreaseDecreaseInDeposits	-686000000	USD
	us-gaap	Increase Decrease In Deposits IncreaseDecreaseInDeposits	-1208000000	USD
	us-gaap	Increase Decrease In Interest And Dividends Receivable IncreaseDecreaseInInterestAndDividendsReceivable	8000000	USD
	us-gaap	Increase Decrease In Interest And Dividends Receivable IncreaseDecreaseInInterestAndDividendsReceivable	21000000	USD
	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	245000000	USD
	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	-105000000	USD
CY2016Q3	us-gaap	Incremental Common Shares Attributable To Call Options And Warrants IncrementalCommonSharesAttributableToCallOptionsAndWarrants	3000000	shares
	us-gaap	Incremental Common Shares Attributable To Call Options And Warrants IncrementalCommonSharesAttributableToCallOptionsAndWarrants	2000000	shares
CY2017Q3	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	1000000	shares
CY2016Q3	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	1000000	shares
CY2017Q3	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	3000000	shares
CY2016Q3	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	480000000	USD
	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	1425000000	USD
CY2017Q3	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	579000000	USD
	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	1604000000	USD
CY2016Q3	us-gaap	Interest And Fee Income Loans And Leases Held In Portfolio InterestAndFeeIncomeLoansAndLeasesHeldInPortfolio	411000000	USD
	us-gaap	Interest And Fee Income Loans And Leases Held In Portfolio InterestAndFeeIncomeLoansAndLeasesHeldInPortfolio	1223000000	USD
CY2017Q3	us-gaap	Interest And Fee Income Loans And Leases Held In Portfolio InterestAndFeeIncomeLoansAndLeasesHeldInPortfolio	500000000	USD
	us-gaap	Interest And Fee Income Loans And Leases Held In Portfolio InterestAndFeeIncomeLoansAndLeasesHeldInPortfolio	1374000000	USD
CY2016Q4	us-gaap	Interest Bearing Deposit Liabilities InterestBearingDepositLiabilities	27445000000	USD
CY2017Q3	us-gaap	Interest Bearing Deposit Liabilities InterestBearingDepositLiabilities	25428000000	USD
CY2016Q4	us-gaap	Interest Bearing Deposits In Banks InterestBearingDepositsInBanks	5969000000	USD
CY2017Q3	us-gaap	Interest Bearing Deposits In Banks InterestBearingDepositsInBanks	4853000000	USD
CY2016Q4	us-gaap	Interest Bearing Foreign Deposit Time Deposits InterestBearingForeignDepositTimeDeposits	19000000	USD
CY2017Q3	us-gaap	Interest Bearing Foreign Deposit Time Deposits InterestBearingForeignDepositTimeDeposits	70000000	USD
CY2016Q3	us-gaap	Interest Expense InterestExpense	30000000	USD
	us-gaap	Interest Expense InterestExpense	83000000	USD
CY2017Q3	us-gaap	Interest Expense InterestExpense	33000000	USD
	us-gaap	Interest Expense InterestExpense	88000000	USD
CY2016Q3	us-gaap	Interest Expense Deposits InterestExpenseDeposits	10000000	USD
	us-gaap	Interest Expense Deposits InterestExpenseDeposits	30000000	USD
CY2017Q3	us-gaap	Interest Expense Deposits InterestExpenseDeposits	11000000	USD
	us-gaap	Interest Expense Deposits InterestExpenseDeposits	29000000	USD
CY2016Q3	us-gaap	Interest Expense Long Term Debt InterestExpenseLongTermDebt	20000000	USD
	us-gaap	Interest Expense Long Term Debt InterestExpenseLongTermDebt	53000000	USD
CY2017Q3	us-gaap	Interest Expense Long Term Debt InterestExpenseLongTermDebt	19000000	USD
	us-gaap	Interest Expense Long Term Debt InterestExpenseLongTermDebt	56000000	USD
CY2016Q3	us-gaap	Interest Expense Short Term Borrowings InterestExpenseShortTermBorrowings	0	USD
	us-gaap	Interest Expense Short Term Borrowings InterestExpenseShortTermBorrowings	0	USD
CY2017Q3	us-gaap	Interest Expense Short Term Borrowings InterestExpenseShortTermBorrowings	3000000	USD
	us-gaap	Interest Expense Short Term Borrowings InterestExpenseShortTermBorrowings	3000000	USD
CY2016Q3	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	434000000	USD
	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	1129000000	USD
CY2017Q3	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	522000000	USD
	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	1459000000	USD
CY2016Q3	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	450000000	USD
	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	1342000000	USD
CY2017Q3	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	546000000	USD
	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	1516000000	USD
	us-gaap	Interest Paid InterestPaid	75000000	USD
	us-gaap	Interest Paid InterestPaid	89000000	USD
CY2016Q3	us-gaap	Labor And Related Expense LaborAndRelatedExpense	247000000	USD
	us-gaap	Labor And Related Expense LaborAndRelatedExpense	742000000	USD
CY2017Q3	us-gaap	Labor And Related Expense LaborAndRelatedExpense	225000000	USD
	us-gaap	Labor And Related Expense LaborAndRelatedExpense	677000000	USD
CY2016Q3	us-gaap	Legal Fees LegalFees	4000000	USD
	us-gaap	Legal Fees LegalFees	14000000	USD
CY2017Q3	us-gaap	Legal Fees LegalFees	4000000	USD
	us-gaap	Legal Fees LegalFees	14000000	USD
CY2016Q4	us-gaap	Letters Of Credit Outstanding Amount LettersOfCreditOutstandingAmount	3700000000	USD
CY2017Q3	us-gaap	Letters Of Credit Outstanding Amount LettersOfCreditOutstandingAmount	3400000000	USD
CY2016Q4	us-gaap	Liabilities Liabilities	65182000000	USD
CY2017Q3	us-gaap	Liabilities Liabilities	63983000000	USD
CY2016Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	72978000000	USD
CY2017Q3	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	72017000000	USD
CY2016Q4	us-gaap	Loans And Leases Receivable Allowance LoansAndLeasesReceivableAllowance	730000000	USD
CY2017Q3	us-gaap	Loans And Leases Receivable Allowance LoansAndLeasesReceivableAllowance	712000000	USD
CY2016Q4	us-gaap	Loans And Leases Receivable Impaired Commitment To Lend LoansAndLeasesReceivableImpairedCommitmentToLend	24000000	USD
CY2017Q3	us-gaap	Loans And Leases Receivable Impaired Commitment To Lend LoansAndLeasesReceivableImpairedCommitmentToLend	25000000	USD
CY2016Q4	us-gaap	Loans And Leases Receivable Impaired Nonperforming Nonaccrual Of Interest LoansAndLeasesReceivableImpairedNonperformingNonaccrualOfInterest	582000000	USD
CY2017Q3	us-gaap	Loans And Leases Receivable Impaired Nonperforming Nonaccrual Of Interest LoansAndLeasesReceivableImpairedNonperformingNonaccrualOfInterest	444000000	USD
CY2016Q4	us-gaap	Loans And Leases Receivable Net Of Deferred Income LoansAndLeasesReceivableNetOfDeferredIncome	49088000000	USD
CY2017Q3	us-gaap	Loans And Leases Receivable Net Of Deferred Income LoansAndLeasesReceivableNetOfDeferredIncome	49209000000	USD
CY2016Q4	us-gaap	Loans And Leases Receivable Net Reported Amount LoansAndLeasesReceivableNetReportedAmount	48358000000	USD
CY2017Q3	us-gaap	Loans And Leases Receivable Net Reported Amount LoansAndLeasesReceivableNetReportedAmount	48497000000	USD
CY2016Q4	us-gaap	Long Term Debt LongTermDebt	5160000000	USD
CY2017Q3	us-gaap	Long Term Debt LongTermDebt	4637000000	USD
CY2016Q3	us-gaap	Loss Contingency Loss In Period LossContingencyLossInPeriod	0	USD
	us-gaap	Loss Contingency Loss In Period LossContingencyLossInPeriod	0	USD
CY2017Q3	us-gaap	Loss Contingency Loss In Period LossContingencyLossInPeriod	0	USD
	us-gaap	Loss Contingency Loss In Period LossContingencyLossInPeriod	-2000000	USD
CY2016Q4	us-gaap	Mortgage Loans In Process Of Foreclosure Amount MortgageLoansInProcessOfForeclosureAmount	0	USD
CY2017Q3	us-gaap	Mortgage Loans In Process Of Foreclosure Amount MortgageLoansInProcessOfForeclosureAmount	0	USD
	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	1798000000	USD
	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-1678000000	USD
	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-307000000	USD
	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-194000000	USD
	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	402000000	USD
	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	858000000	USD
CY2016Q3	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	148000000	USD
	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	310000000	USD
CY2017Q3	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	224000000	USD
	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	626000000	USD
CY2016Q4	us-gaap	Noninterest Bearing Deposit Liabilities NoninterestBearingDepositLiabilities	31540000000	USD
CY2017Q3	us-gaap	Noninterest Bearing Deposit Liabilities NoninterestBearingDepositLiabilities	32391000000	USD
CY2016Q3	us-gaap	Noninterest Expense NoninterestExpense	493000000	USD
	us-gaap	Noninterest Expense NoninterestExpense	1469000000	USD
CY2017Q3	us-gaap	Noninterest Expense NoninterestExpense	463000000	USD
	us-gaap	Noninterest Expense NoninterestExpense	1377000000	USD
CY2016Q3	us-gaap	Noninterest Income NoninterestIncome	272000000	USD
	us-gaap	Noninterest Income NoninterestIncome	784000000	USD
CY2017Q3	us-gaap	Noninterest Income NoninterestIncome	275000000	USD
	us-gaap	Noninterest Income NoninterestIncome	822000000	USD
CY2016Q3	us-gaap	Noninterest Income Other Operating Income NoninterestIncomeOtherOperatingIncome	29000000	USD
	us-gaap	Noninterest Income Other Operating Income NoninterestIncomeOtherOperatingIncome	75000000	USD
CY2017Q3	us-gaap	Noninterest Income Other Operating Income NoninterestIncomeOtherOperatingIncome	25000000	USD
	us-gaap	Noninterest Income Other Operating Income NoninterestIncomeOtherOperatingIncome	85000000	USD
CY2016Q3	us-gaap	Occupancy Net OccupancyNet	40000000	USD
	us-gaap	Occupancy Net OccupancyNet	117000000	USD
CY2017Q3	us-gaap	Occupancy Net OccupancyNet	38000000	USD
	us-gaap	Occupancy Net OccupancyNet	114000000	USD
CY2016Q4	us-gaap	Other Assets OtherAssets	4440000000	USD
CY2017Q3	us-gaap	Other Assets OtherAssets	4415000000	USD
	us-gaap	Other Comprehensive Income Defined Benefit Plan Net Prior Service Cost Credit Arising During Period Before Tax OtherComprehensiveIncomeDefinedBenefitPlanNetPriorServiceCostCreditArisingDuringPeriodBeforeTax	-235000000	USD
	us-gaap	Other Comprehensive Income Defined Benefit Plan Net Prior Service Cost Credit Arising During Period Before Tax OtherComprehensiveIncomeDefinedBenefitPlanNetPriorServiceCostCreditArisingDuringPeriodBeforeTax	0	USD
	us-gaap	Other Comprehensive Income Defined Benefit Plans Net Unamortized Gain Loss Arising During Period Net Of Tax OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax	28000000	USD
	us-gaap	Other Comprehensive Income Defined Benefit Plans Net Unamortized Gain Loss Arising During Period Net Of Tax OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax	0	USD
	us-gaap	Other Comprehensive Income Defined Benefit Plans Net Unamortized Gain Loss Arising During Period Tax OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodTax	16000000	USD
	us-gaap	Other Comprehensive Income Defined Benefit Plans Net Unamortized Gain Loss Arising During Period Tax OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodTax	0	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	0	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 Available For Sale Securities Adjustment Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	90000000	USD
	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	13000000	USD
	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	137000000	USD
	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	24000000	USD
	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	-47000000	USD
	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	-11000000	USD
	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Net Unamortized Gain Loss Arising During Period Before Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansNetUnamortizedGainLossArisingDuringPeriodBeforeTax	-191000000	USD
	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Net Unamortized Gain Loss Arising During Period Before Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansNetUnamortizedGainLossArisingDuringPeriodBeforeTax	0	USD
	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansBeforeTax	44000000	USD
	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansBeforeTax	0	USD
	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Gain Loss Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossBeforeTax	-29000000	USD
	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Gain Loss Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossBeforeTax	-38000000	USD
	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	140000000	USD
	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	18000000	USD
	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	89000000	USD
	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	11000000	USD
	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	51000000	USD
	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	7000000	USD
CY2016Q3	us-gaap	Other Interest And Dividend Income OtherInterestAndDividendIncome	8000000	USD
	us-gaap	Other Interest And Dividend Income OtherInterestAndDividendIncome	17000000	USD
CY2017Q3	us-gaap	Other Interest And Dividend Income OtherInterestAndDividendIncome	17000000	USD
	us-gaap	Other Interest And Dividend Income OtherInterestAndDividendIncome	44000000	USD
CY2016Q4	us-gaap	Other Liabilities OtherLiabilities	1012000000	USD
CY2017Q3	us-gaap	Other Liabilities OtherLiabilities	1018000000	USD
CY2016Q3	us-gaap	Other Noninterest Expense OtherNoninterestExpense	37000000	USD
	us-gaap	Other Noninterest Expense OtherNoninterestExpense	106000000	USD
CY2017Q3	us-gaap	Other Noninterest Expense OtherNoninterestExpense	33000000	USD
	us-gaap	Other Noninterest Expense OtherNoninterestExpense	103000000	USD
CY2016Q4	us-gaap	Other Short Term Investments OtherShortTermInvestments	92000000	USD
CY2017Q3	us-gaap	Other Short Term Investments OtherShortTermInvestments	92000000	USD
	us-gaap	Payments For Proceeds From Loans And Leases PaymentsForProceedsFromLoansAndLeases	290000000	USD
	us-gaap	Payments For Proceeds From Loans And Leases PaymentsForProceedsFromLoansAndLeases	193000000	USD
	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	-3000000	USD
	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	-2000000	USD
	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	215000000	USD
	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	404000000	USD
CY2016Q3	us-gaap	Payments For Restructuring PaymentsForRestructuring	21000000	USD
	us-gaap	Payments For Restructuring PaymentsForRestructuring	24000000	USD
CY2017Q3	us-gaap	Payments For Restructuring PaymentsForRestructuring	6000000	USD
	us-gaap	Payments For Restructuring PaymentsForRestructuring	33000000	USD
	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	112000000	USD
	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	128000000	USD
	us-gaap	Payments To Acquire Available For Sale Securities PaymentsToAcquireAvailableForSaleSecurities	1396000000	USD
	us-gaap	Payments To Acquire Available For Sale Securities PaymentsToAcquireAvailableForSaleSecurities	2655000000	USD
	us-gaap	Payments To Acquire Federal Home Loan Bank Stock PaymentsToAcquireFederalHomeLoanBankStock	115000000	USD
	us-gaap	Payments To Acquire Federal Home Loan Bank Stock PaymentsToAcquireFederalHomeLoanBankStock	42000000	USD
	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	25000000	USD
	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	98000000	USD
	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	2800000000	USD
	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	0	USD
	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	1259000000	USD
	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	1198000000	USD
	us-gaap	Proceeds From Maturities Prepayments And Calls Of Held To Maturity Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfHeldToMaturitySecurities	288000000	USD
	us-gaap	Proceeds From Maturities Prepayments And Calls Of Held To Maturity Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfHeldToMaturitySecurities	241000000	USD
	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-3000000	USD
	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-4000000	USD
	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	-11000000	USD
	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	484000000	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	1259000000	USD
	us-gaap	Proceeds From Sale Of Federal Home Loan Bank Stock ProceedsFromSaleOfFederalHomeLoanBankStock	0	USD
	us-gaap	Proceeds From Sale Of Foreclosed Assets ProceedsFromSaleOfForeclosedAssets	18000000	USD
	us-gaap	Proceeds From Sale Of Federal Home Loan Bank Stock ProceedsFromSaleOfFederalHomeLoanBankStock	21000000	USD
	us-gaap	Proceeds From Sale Of Foreclosed Assets ProceedsFromSaleOfForeclosedAssets	15000000	USD
CY2016Q3	us-gaap	Profit Loss ProfitLoss	149000000	USD
	us-gaap	Profit Loss ProfitLoss	313000000	USD
CY2017Q3	us-gaap	Profit Loss ProfitLoss	226000000	USD
	us-gaap	Profit Loss ProfitLoss	631000000	USD
CY2016Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	501000000	USD
CY2017Q3	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	467000000	USD
CY2016Q3	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	16000000	USD
	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	213000000	USD
CY2017Q3	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	24000000	USD
	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	57000000	USD
	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	0	USD
	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	500000000	USD
	us-gaap	Repayments Of Other Debt RepaymentsOfOtherDebt	0	USD
	us-gaap	Repayments Of Other Debt RepaymentsOfOtherDebt	16000000	USD
	us-gaap	Restructuring And Related Activities Completion Date RestructuringAndRelatedActivitiesCompletionDate	2018-12-31
CY2017Q3	us-gaap	Restructuring And Related Cost Cost Incurred To Date1 RestructuringAndRelatedCostCostIncurredToDate1	125000000	USD
CY2016Q3	us-gaap	Restructuring Charges RestructuringCharges	20000000	USD
	us-gaap	Restructuring Charges RestructuringCharges	73000000	USD
CY2017Q3	us-gaap	Restructuring Charges RestructuringCharges	7000000	USD
	us-gaap	Restructuring Charges RestructuringCharges	32000000	USD
CY2015Q4	us-gaap	Restructuring Reserve RestructuringReserve	0	USD
CY2016Q2	us-gaap	Restructuring Reserve RestructuringReserve	50000000	USD
CY2016Q3	us-gaap	Restructuring Reserve RestructuringReserve	47000000	USD
CY2016Q4	us-gaap	Restructuring Reserve RestructuringReserve	18000000	USD
CY2017Q2	us-gaap	Restructuring Reserve RestructuringReserve	11000000	USD
CY2017Q3	us-gaap	Restructuring Reserve RestructuringReserve	12000000	USD
CY2016Q3	us-gaap	Restructuring Reserve Settled Without Cash2 RestructuringReserveSettledWithoutCash2	2000000	USD
	us-gaap	Restructuring Reserve Settled Without Cash2 RestructuringReserveSettledWithoutCash2	2000000	USD
	us-gaap	Restructuring Reserve Settled Without Cash2 RestructuringReserveSettledWithoutCash2	5000000	USD
CY2016Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	7331000000	USD
CY2017Q3	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	7746000000	USD
	us-gaap	Share Based Compensation ShareBasedCompensation	30000000	USD
	us-gaap	Share Based Compensation ShareBasedCompensation	29000000	USD
CY2016Q4	us-gaap	Short Term Borrowings ShortTermBorrowings	25000000	USD
CY2017Q3	us-gaap	Short Term Borrowings ShortTermBorrowings	509000000	USD
	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	13000000	USD
	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	90000000	USD
CY2015Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	7560000000	USD
CY2016Q3	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	7727000000	USD
CY2016Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	7796000000	USD
CY2017Q3	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	8034000000	USD
	us-gaap	Stockholders Equity Other StockholdersEquityOther	0	USD
	us-gaap	Transfer Of Loans Held For Sale To Portfolio Loans1 TransferOfLoansHeldForSaleToPortfolioLoans1	17000000	USD
	us-gaap	Transfer Of Loans Held For Sale To Portfolio Loans1 TransferOfLoansHeldForSaleToPortfolioLoans1	0	USD
	us-gaap	Transfer To Other Real Estate TransferToOtherRealEstate	21000000	USD
CY2016Q4	us-gaap	Treasury Stock Shares TreasuryStockShares	52851156	shares
CY2017Q3	us-gaap	Treasury Stock Shares TreasuryStockShares	53835135	shares
CY2016Q4	us-gaap	Treasury Stock Value TreasuryStockValue	2428000000	USD
CY2017Q3	us-gaap	Treasury Stock Value TreasuryStockValue	2606000000	USD
	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	211000000	USD
	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	396000000	USD
CY2016Q4	us-gaap	Unamortized Debt Issuance Expense UnamortizedDebtIssuanceExpense	7000000	USD
CY2017Q3	us-gaap	Unamortized Debt Issuance Expense UnamortizedDebtIssuanceExpense	5000000	USD
CY2016Q3	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
CY2017Q3	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
CY2016Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	15000000	USD
CY2017Q3	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	11000000	USD
	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	4000000	USD
CY2016Q4	us-gaap	Unrecognized Tax Benefits Income Tax Penalties And Interest Accrued UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued	7000000	USD
CY2017Q3	us-gaap	Unrecognized Tax Benefits Income Tax Penalties And Interest Accrued UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued	9000000	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
CY2017Q3	us-gaap	Variable Interest Entity Nonconsolidated Carrying Amount Liabilities VariableInterestEntityNonconsolidatedCarryingAmountLiabilities	170000000	USD
CY2016Q3	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	176000000	shares
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	176000000	shares
CY2017Q3	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	177000000	shares
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	179000000	shares
CY2016Q3	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	171000000	shares
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	173000000	shares
CY2017Q3	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	174000000	shares
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	175000000	shares

Files In Submission

Name	View Source	Status
0000028412-17-000123-index-headers.html	Edgar Link	pending
0000028412-17-000123-index.html	Edgar Link	pending
0000028412-17-000123.txt	Edgar Link	pending
0000028412-17-000123-xbrl.zip	Edgar Link	pending
cma-20170930.xml	Edgar Link	completed
cma-20170930.xsd	Edgar Link	pending
cma-20170930_cal.xml	Edgar Link	unprocessable
cma-20170930_def.xml	Edgar Link	unprocessable
cma-20170930_lab.xml	Edgar Link	unprocessable
cma-20170930_pre.xml	Edgar Link	unprocessable
cma-2017q310q.htm	Edgar Link	pending
cma-2017q310q_ex311.htm	Edgar Link	pending
cma-2017q310q_ex312.htm	Edgar Link	pending
cma-2017q310q_ex32.htm	Edgar Link	pending
FilingSummary.xml	Edgar Link	unprocessable
Financial_Report.xlsx	Edgar Link	pending
R1.htm	Edgar Link	pending
R10.htm	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

2017 Q4 Form 10-Q Financial Statement

#000002841217000123 Filed on October 30, 2017

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$CMA COMERICA INC /NEW/ Stock $cma

2017 Q4 Form 10-Q Financial Statement

#000002841217000123 Filed on October 30, 2017

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$CMA
COMERICA INC /NEW/ Stock $cma