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Summary of Loans Modified in a TDR (Parenthetical) (Detail) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Financing Receivable, Modifications [Line Items]      
Financing Receivable, Modifications, Number of Contracts 11,102us-gaap_FinancingReceivableModificationsNumberOfContracts2 [1],[2] 11,291us-gaap_FinancingReceivableModificationsNumberOfContracts2 [1],[2] 16,064us-gaap_FinancingReceivableModificationsNumberOfContracts2 [1],[2]
Financing Receivable Modifications Post Modification Recorded Investment1 $ 548us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2 [1] $ 1,081us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2 [1] $ 793us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2 [1]
Allowance for Loan and Lease Losses, Adjustments, Net 27us-gaap_AllowanceForLoanAndLeaseLossesAdjustmentsNet [1] 58us-gaap_AllowanceForLoanAndLeaseLossesAdjustmentsNet [1] 24us-gaap_AllowanceForLoanAndLeaseLossesAdjustmentsNet [1]
Allowance for Loan and Lease Losses, Write-offs 8us-gaap_AllowanceForLoanAndLeaseLossesWriteOffs [1] 44us-gaap_AllowanceForLoanAndLeaseLossesWriteOffs [1] 11us-gaap_AllowanceForLoanAndLeaseLossesWriteOffs [1]
Variable Interest Entity, Primary Beneficiary      
Financing Receivable, Modifications [Line Items]      
Financing Receivable Modifications Post Modification Recorded Investment1   29us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ dei_LegalEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember		  
Allowance for Loan and Lease Losses, Adjustments, Net   7us-gaap_AllowanceForLoanAndLeaseLossesAdjustmentsNet
/ dei_LegalEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember		  
Allowance for Loan and Lease Losses, Write-offs   2us-gaap_AllowanceForLoanAndLeaseLossesWriteOffs
/ dei_LegalEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember		  
Commercial Portfolio Segment | Commercial Mortgage Loans Owner Occupied [Member]      
Financing Receivable, Modifications [Line Items]      
Financing Receivable, Modifications, Number of Contracts 32us-gaap_FinancingReceivableModificationsNumberOfContracts2
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fitb_CommercialMortgageLoansOwnerOccupiedMember
/ fitb_PortfolioSegmentAxis
= us-gaap_CommercialPortfolioSegmentMember		 [1],[2] 65us-gaap_FinancingReceivableModificationsNumberOfContracts2
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fitb_CommercialMortgageLoansOwnerOccupiedMember
/ fitb_PortfolioSegmentAxis
= us-gaap_CommercialPortfolioSegmentMember		 [1],[2],[3] 67us-gaap_FinancingReceivableModificationsNumberOfContracts2
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fitb_CommercialMortgageLoansOwnerOccupiedMember
/ fitb_PortfolioSegmentAxis
= us-gaap_CommercialPortfolioSegmentMember		 [1],[2]
Financing Receivable Modifications Post Modification Recorded Investment1 54us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fitb_CommercialMortgageLoansOwnerOccupiedMember
/ fitb_PortfolioSegmentAxis
= us-gaap_CommercialPortfolioSegmentMember		 [1] 19us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fitb_CommercialMortgageLoansOwnerOccupiedMember
/ fitb_PortfolioSegmentAxis
= us-gaap_CommercialPortfolioSegmentMember		 [1],[3] 53us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fitb_CommercialMortgageLoansOwnerOccupiedMember
/ fitb_PortfolioSegmentAxis
= us-gaap_CommercialPortfolioSegmentMember		 [1]
Allowance for Loan and Lease Losses, Adjustments, Net (1)us-gaap_AllowanceForLoanAndLeaseLossesAdjustmentsNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fitb_CommercialMortgageLoansOwnerOccupiedMember
/ fitb_PortfolioSegmentAxis
= us-gaap_CommercialPortfolioSegmentMember		 [1] (2)us-gaap_AllowanceForLoanAndLeaseLossesAdjustmentsNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fitb_CommercialMortgageLoansOwnerOccupiedMember
/ fitb_PortfolioSegmentAxis
= us-gaap_CommercialPortfolioSegmentMember		 [1],[3] (8)us-gaap_AllowanceForLoanAndLeaseLossesAdjustmentsNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fitb_CommercialMortgageLoansOwnerOccupiedMember
/ fitb_PortfolioSegmentAxis
= us-gaap_CommercialPortfolioSegmentMember		 [1]
Allowance for Loan and Lease Losses, Write-offs     $ 2us-gaap_AllowanceForLoanAndLeaseLossesWriteOffs
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fitb_CommercialMortgageLoansOwnerOccupiedMember
/ fitb_PortfolioSegmentAxis
= us-gaap_CommercialPortfolioSegmentMember		 [1]
[1] Excludes all loans and leases held for sale and loans acquired with deteriorated credit quality.
[2] Represents number of loans post-modification.
[3] Excludes five loans modified in a TDR during the year ended December 31, 2013 associated with a consolidated VIE in which the Bancorp has no continuing credit risk due to the risk being assumed by a third party. The TDR had a recorded investment of $29 at modification, ALLL increased $7 upon modification, and a charge-off of $2 was recognized upon modification.