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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
 3 Months Ended 12 Months Ended
Mar. 31, 2015
Dec. 31, 2014
Mar. 31, 2014
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Financing Receivable Recorded Investment 30 To 89 Days Past Due $ 242fitb_FinancingReceivableRecordedInvestment30To89DaysPastDue [1],[2] $ 297fitb_FinancingReceivableRecordedInvestment30To89DaysPastDue [1],[3]  
Past Due 90 Days and Greater 366us-gaap_FinancingReceivableRecordedInvestmentEqualToGreaterThan90DaysPastDue [1],[2] 407us-gaap_FinancingReceivableRecordedInvestmentEqualToGreaterThan90DaysPastDue [1],[3]  
Residential Mortgage      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Portfolio loans and leases at fair value 126us-gaap_LoansReceivableFairValueDisclosure
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ResidentialMortgageMember		   103us-gaap_LoansReceivableFairValueDisclosure
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ResidentialMortgageMember
Residential Mortgage Loans      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Portfolio loans and leases at fair value 126us-gaap_LoansReceivableFairValueDisclosure
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_ResidentialPortfolioSegmentMember		 108us-gaap_LoansReceivableFairValueDisclosure
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_ResidentialPortfolioSegmentMember		  
Residential Mortgage Loans | Federal Housing Administration Loan      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Financing Receivable Recorded Investment 30 To 89 Days Past Due 79fitb_FinancingReceivableRecordedInvestment30To89DaysPastDue
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_ResidentialPortfolioSegmentMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= us-gaap_FederalHousingAdministrationLoanMember		 99fitb_FinancingReceivableRecordedInvestment30To89DaysPastDue
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_ResidentialPortfolioSegmentMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= us-gaap_FederalHousingAdministrationLoanMember		  
Past Due 90 Days and Greater 375us-gaap_FinancingReceivableRecordedInvestmentEqualToGreaterThan90DaysPastDue
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_ResidentialPortfolioSegmentMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= us-gaap_FederalHousingAdministrationLoanMember		 373us-gaap_FinancingReceivableRecordedInvestmentEqualToGreaterThan90DaysPastDue
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_ResidentialPortfolioSegmentMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= us-gaap_FederalHousingAdministrationLoanMember		  
Losses Due To Claim Denials And Curtailments $ 2fitb_LossesDueToClaimDenialsAndCurtailments
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_ResidentialPortfolioSegmentMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= us-gaap_FederalHousingAdministrationLoanMember		 $ 5fitb_LossesDueToClaimDenialsAndCurtailments
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_ResidentialPortfolioSegmentMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= us-gaap_FederalHousingAdministrationLoanMember		  
[1] Includes accrual and nonaccrual loans and leases.
[2] Excludes $126 of loans measured at fair value.
[3] Excludes $108 of loans measured at fair value.