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Summary of the Bancorp's Nonperforming Loans and Leases by Class (Parenthetical) (Detail) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Financing Receivable, Modifications [Line Items]    
Loans held for sale $ 1,261us-gaap_LoansReceivableHeldForSaleNet [1] $ 944us-gaap_LoansReceivableHeldForSaleNet [1]
Other Real Estate, Foreclosed Assets, and Repossessed Assets 236us-gaap_OtherRealEstateAndForeclosedAssets 306us-gaap_OtherRealEstateAndForeclosedAssets
Portfolio loans and leases 90,084us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome 88,614us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
Variable Interest Entity, Primary Beneficiary    
Financing Receivable, Modifications [Line Items]    
Restructured nonaccrual loans and leases 21us-gaap_FinancingReceivableModificationsRecordedInvestment
/ dei_LegalEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember		 21us-gaap_FinancingReceivableModificationsRecordedInvestment
/ dei_LegalEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
Government insured    
Financing Receivable, Modifications [Line Items]    
Other Real Estate, Foreclosed Assets, and Repossessed Assets 71us-gaap_OtherRealEstateAndForeclosedAssets
/ fitb_GovernmentInsuredAxis
= fitb_GovernmentInsuredMember		 77us-gaap_OtherRealEstateAndForeclosedAssets
/ fitb_GovernmentInsuredAxis
= fitb_GovernmentInsuredMember
Nonperforming Financing Receivable    
Financing Receivable, Modifications [Line Items]    
Loans held for sale 39us-gaap_LoansReceivableHeldForSaleNet
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_NonperformingFinancingReceivableMember		 6us-gaap_LoansReceivableHeldForSaleNet
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_NonperformingFinancingReceivableMember
Nonperforming Financing Receivable | Government insured | Small Business Administration [Member]    
Financing Receivable, Modifications [Line Items]    
Portfolio loans and leases 9us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ fitb_GovernmentInsuredAxis
= fitb_GovernmentInsuredMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_NonperformingFinancingReceivableMember
/ fitb_SmallBusinessAdministrationAxis
= fitb_SmallBusinessAdministrationMember		 10us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ fitb_GovernmentInsuredAxis
= fitb_GovernmentInsuredMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_NonperformingFinancingReceivableMember
/ fitb_SmallBusinessAdministrationAxis
= fitb_SmallBusinessAdministrationMember
Nonperforming Financing Receivable | Government insured | Commercial Portfolio Segment | Restructured Loans    
Financing Receivable, Modifications [Line Items]    
Restructured nonaccrual loans and leases $ 4us-gaap_FinancingReceivableModificationsRecordedInvestment
/ us-gaap_FinancialInstrumentAxis
= fitb_RestructuredLoansMember
/ fitb_GovernmentInsuredAxis
= fitb_GovernmentInsuredMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_NonperformingFinancingReceivableMember
/ fitb_PortfolioSegmentAxis
= us-gaap_CommercialPortfolioSegmentMember		 $ 2us-gaap_FinancingReceivableModificationsRecordedInvestment
/ us-gaap_FinancialInstrumentAxis
= fitb_RestructuredLoansMember
/ fitb_GovernmentInsuredAxis
= fitb_GovernmentInsuredMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_NonperformingFinancingReceivableMember
/ fitb_PortfolioSegmentAxis
= us-gaap_CommercialPortfolioSegmentMember
[1] Includes $561 and $890 of residential mortgage loans held for sale measured at fair value at December 31, 2014, and 2013, respectively.