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Fair Values of Assets and Liabilities (Significant Unobservable Level 3 Inputs Recurring Basis) (Detail) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Fair Value Inputs [Line Items]      
Derivative instruments 2,493us-gaap_DerivativeFairValueOfDerivativeAsset   $ 2,080us-gaap_DerivativeFairValueOfDerivativeAsset
Residential mortgage loans      
Fair Value Inputs [Line Items]      
Residential mortgage loans measured at FV 126us-gaap_LoansReceivableFairValueDisclosure
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ResidentialMortgageMember		 103us-gaap_LoansReceivableFairValueDisclosure
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ResidentialMortgageMember		  
IRLCs, net      
Fair Value Inputs [Line Items]      
Derivative instruments 19us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_FinancialInstrumentAxis
= us-gaap_InterestRateLockCommitmentsMember		 16us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_FinancialInstrumentAxis
= us-gaap_InterestRateLockCommitmentsMember		  
Stock warrants associated with Vantiv Holding, LLC      
Fair Value Inputs [Line Items]      
Derivative instruments 485us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_FinancialInstrumentAxis
= us-gaap_WarrantMember		 348us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_FinancialInstrumentAxis
= us-gaap_WarrantMember		  
Swap associated with the sale of Visa, Inc. Class B shares      
Fair Value Inputs [Line Items]      
Derivative instruments (60)us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_FinancialInstrumentAxis
= us-gaap_SwapMember		 (43)us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_FinancialInstrumentAxis
= us-gaap_SwapMember		  
Minimum | Residential mortgage loans      
Fair Value Inputs [Line Items]      
Interest rate risk factor (5.70%)fitb_FairValueInputsInterestRateRiskFactor
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ResidentialMortgageMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		 (21.80%)fitb_FairValueInputsInterestRateRiskFactor
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ResidentialMortgageMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		  
Minimum | IRLCs, net      
Fair Value Inputs [Line Items]      
Loan closing rates 2.30%fitb_FairValueInputsLoanClosingRates
/ us-gaap_FinancialInstrumentAxis
= us-gaap_InterestRateLockCommitmentsMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		 7.30%fitb_FairValueInputsLoanClosingRates
/ us-gaap_FinancialInstrumentAxis
= us-gaap_InterestRateLockCommitmentsMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		  
Minimum | Stock warrants associated with Vantiv Holding, LLC      
Fair Value Inputs [Line Items]      
Expected term (years) 2 years 2 years  
Expected volatility 22.90%us-gaap_FairValueAssumptionsExpectedVolatilityRate
/ us-gaap_FinancialInstrumentAxis
= us-gaap_WarrantMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		 [1] 25.00%us-gaap_FairValueAssumptionsExpectedVolatilityRate
/ us-gaap_FinancialInstrumentAxis
= us-gaap_WarrantMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		 [1]  
Minimum | Swap associated with the sale of Visa, Inc. Class B shares      
Fair Value Inputs [Line Items]      
Timing of the resolution of the covered litigation 2016-09-30 2014-12-31  
Maximum | Residential mortgage loans      
Fair Value Inputs [Line Items]      
Interest rate risk factor 18.30%fitb_FairValueInputsInterestRateRiskFactor
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ResidentialMortgageMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		 20.10%fitb_FairValueInputsInterestRateRiskFactor
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ResidentialMortgageMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		  
Credit risk factor 47.90%us-gaap_FairValueInputsEntityCreditRisk
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ResidentialMortgageMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		 62.40%us-gaap_FairValueInputsEntityCreditRisk
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ResidentialMortgageMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		  
Maximum | IRLCs, net      
Fair Value Inputs [Line Items]      
Loan closing rates 87.60%fitb_FairValueInputsLoanClosingRates
/ us-gaap_FinancialInstrumentAxis
= us-gaap_InterestRateLockCommitmentsMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		 95.00%fitb_FairValueInputsLoanClosingRates
/ us-gaap_FinancialInstrumentAxis
= us-gaap_InterestRateLockCommitmentsMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		  
Maximum | Stock warrants associated with Vantiv Holding, LLC      
Fair Value Inputs [Line Items]      
Expected term (years) 14 years 3 months 18 days 15 years 3 months  
Expected volatility 32.20%us-gaap_FairValueAssumptionsExpectedVolatilityRate
/ us-gaap_FinancialInstrumentAxis
= us-gaap_WarrantMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		 [1] 32.70%us-gaap_FairValueAssumptionsExpectedVolatilityRate
/ us-gaap_FinancialInstrumentAxis
= us-gaap_WarrantMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		 [1]  
Maximum | Swap associated with the sale of Visa, Inc. Class B shares      
Fair Value Inputs [Line Items]      
Timing of the resolution of the covered litigation 2021-03-31 2019-12-31  
Weighted average | Residential mortgage loans      
Fair Value Inputs [Line Items]      
Interest rate risk factor 5.30%fitb_FairValueInputsInterestRateRiskFactor
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ResidentialMortgageMember
/ us-gaap_RangeAxis
= us-gaap_WeightedAverageMember		 3.00%fitb_FairValueInputsInterestRateRiskFactor
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ResidentialMortgageMember
/ us-gaap_RangeAxis
= us-gaap_WeightedAverageMember		  
Credit risk factor 1.20%us-gaap_FairValueInputsEntityCreditRisk
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ResidentialMortgageMember
/ us-gaap_RangeAxis
= us-gaap_WeightedAverageMember		 2.00%us-gaap_FairValueInputsEntityCreditRisk
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ResidentialMortgageMember
/ us-gaap_RangeAxis
= us-gaap_WeightedAverageMember		  
Weighted average | IRLCs, net      
Fair Value Inputs [Line Items]      
Loan closing rates 67.00%fitb_FairValueInputsLoanClosingRates
/ us-gaap_FinancialInstrumentAxis
= us-gaap_InterestRateLockCommitmentsMember
/ us-gaap_RangeAxis
= us-gaap_WeightedAverageMember		 67.60%fitb_FairValueInputsLoanClosingRates
/ us-gaap_FinancialInstrumentAxis
= us-gaap_InterestRateLockCommitmentsMember
/ us-gaap_RangeAxis
= us-gaap_WeightedAverageMember		  
Weighted average | Stock warrants associated with Vantiv Holding, LLC      
Fair Value Inputs [Line Items]      
Expected term (years) 5 years 10 months 24 days 6 years  
Expected volatility 26.50%us-gaap_FairValueAssumptionsExpectedVolatilityRate
/ us-gaap_FinancialInstrumentAxis
= us-gaap_WarrantMember
/ us-gaap_RangeAxis
= us-gaap_WeightedAverageMember		 [1] 28.10%us-gaap_FairValueAssumptionsExpectedVolatilityRate
/ us-gaap_FinancialInstrumentAxis
= us-gaap_WarrantMember
/ us-gaap_RangeAxis
= us-gaap_WeightedAverageMember		 [1]  
[1] Based on historical and implied volatilities of Vantiv, Inc. and comparable companies assuming similar expected terms.