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Summarizes the Bancorp's Recorded Investment in Portfolio Loans and Leases by Age and Class (Parenthetical) (Detail) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Financing Receivable Recorded Investment 30 To 89 Days Past Due $ 297fitb_FinancingReceivableRecordedInvestment30To89DaysPastDue [1],[2] $ 345fitb_FinancingReceivableRecordedInvestment30To89DaysPastDue [1],[3]
Past Due 90 Days and Greater 407us-gaap_FinancingReceivableRecordedInvestmentEqualToGreaterThan90DaysPastDue [1],[2] 643us-gaap_FinancingReceivableRecordedInvestmentEqualToGreaterThan90DaysPastDue [1],[3]
Residential Mortgage    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Portfolio loans and leases at fair value 108us-gaap_LoansReceivableFairValueDisclosure
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ResidentialMortgageMember		 92us-gaap_LoansReceivableFairValueDisclosure
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ResidentialMortgageMember
Federal Housing Administration Loan | Residential Mortgage    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Financing Receivable Recorded Investment 30 To 89 Days Past Due 99fitb_FinancingReceivableRecordedInvestment30To89DaysPastDue
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ResidentialMortgageMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= us-gaap_FederalHousingAdministrationLoanMember		 81fitb_FinancingReceivableRecordedInvestment30To89DaysPastDue
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ResidentialMortgageMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= us-gaap_FederalHousingAdministrationLoanMember
Past Due 90 Days and Greater 373us-gaap_FinancingReceivableRecordedInvestmentEqualToGreaterThan90DaysPastDue
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ResidentialMortgageMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= us-gaap_FederalHousingAdministrationLoanMember		 378us-gaap_FinancingReceivableRecordedInvestmentEqualToGreaterThan90DaysPastDue
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ResidentialMortgageMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= us-gaap_FederalHousingAdministrationLoanMember
Losses Due To Claim Denials And Curtailments $ 14fitb_LossesDueToClaimDenialsAndCurtailments
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ResidentialMortgageMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= us-gaap_FederalHousingAdministrationLoanMember		 $ 5fitb_LossesDueToClaimDenialsAndCurtailments
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ResidentialMortgageMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= us-gaap_FederalHousingAdministrationLoanMember
[1] Includes accrual and nonaccrual loans and leases.
[2] Excludes $108 of loans measured at fair value.
[3] Excludes $92 of loans measured at fair value.