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Fair Values of Assets and Liabilities (Significant Unobservable Level 3 Inputs Recurring Basis) (Detail) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Fair Value Inputs [Line Items]    
Derivative instruments 2,080us-gaap_DerivativeFairValueOfDerivativeAsset 1,553us-gaap_DerivativeFairValueOfDerivativeAsset
Residential mortgage loans    
Fair Value Inputs [Line Items]    
Residential mortgage loans 108us-gaap_LoansReceivableFairValueDisclosure
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ResidentialMortgageMember		 92us-gaap_LoansReceivableFairValueDisclosure
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ResidentialMortgageMember
IRLCs, net    
Fair Value Inputs [Line Items]    
Derivative instruments 12us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_FinancialInstrumentAxis
= us-gaap_InterestRateLockCommitmentsMember		 11us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_FinancialInstrumentAxis
= us-gaap_InterestRateLockCommitmentsMember
Stock warrants associated with Vantiv Holding, LLC    
Fair Value Inputs [Line Items]    
Derivative instruments 415us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_FinancialInstrumentAxis
= us-gaap_WarrantMember		 384us-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 (49)us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_FinancialInstrumentAxis
= us-gaap_SwapMember		 (48)us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_FinancialInstrumentAxis
= us-gaap_SwapMember
Lower limit | Residential mortgage loans    
Fair Value Inputs [Line Items]    
Interest rate risk factor (7.20%)fitb_FairValueInputsInterestRateRiskFactor
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ResidentialMortgageMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		 (23.70%)fitb_FairValueInputsInterestRateRiskFactor
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ResidentialMortgageMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
Credit risk factor 0.00%us-gaap_FairValueInputsEntityCreditRisk
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ResidentialMortgageMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		 0.00%us-gaap_FairValueInputsEntityCreditRisk
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ResidentialMortgageMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
Lower limit | IRLCs, net    
Fair Value Inputs [Line Items]    
Loan closing rates 8.80%fitb_FairValueInputsLoanClosingRates
/ us-gaap_FinancialInstrumentAxis
= us-gaap_InterestRateLockCommitmentsMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		 14.90%fitb_FairValueInputsLoanClosingRates
/ us-gaap_FinancialInstrumentAxis
= us-gaap_InterestRateLockCommitmentsMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
Lower limit | 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] 18.50%us-gaap_FairValueAssumptionsExpectedVolatilityRate
/ us-gaap_FinancialInstrumentAxis
= us-gaap_WarrantMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		 [1]
Lower limit | Swap associated with the sale of Visa, Inc. Class B shares    
Fair Value Inputs [Line Items]    
Timing of the resolution of the covered litigation 2015-12-31 2014-12-31
Maximum | Residential mortgage loans    
Fair Value Inputs [Line Items]    
Interest rate risk factor 17.70%fitb_FairValueInputsInterestRateRiskFactor
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ResidentialMortgageMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		 16.50%fitb_FairValueInputsInterestRateRiskFactor
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ResidentialMortgageMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
Credit risk factor 46.60%us-gaap_FairValueInputsEntityCreditRisk
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ResidentialMortgageMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		 63.40%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 86.70%fitb_FairValueInputsLoanClosingRates
/ us-gaap_FinancialInstrumentAxis
= us-gaap_InterestRateLockCommitmentsMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		 98.70%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 6 months 15 years 6 months
Expected volatility 32.20%us-gaap_FairValueAssumptionsExpectedVolatilityRate
/ us-gaap_FinancialInstrumentAxis
= us-gaap_WarrantMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		 [1] 33.20%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 2020-06-30 2019-12-31
Weighted average | Residential mortgage loans    
Fair Value Inputs [Line Items]    
Interest rate risk factor 5.00%fitb_FairValueInputsInterestRateRiskFactor
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ResidentialMortgageMember
/ us-gaap_RangeAxis
= us-gaap_WeightedAverageMember		 2.30%fitb_FairValueInputsInterestRateRiskFactor
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ResidentialMortgageMember
/ us-gaap_RangeAxis
= us-gaap_WeightedAverageMember
Credit risk factor 1.80%us-gaap_FairValueInputsEntityCreditRisk
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ResidentialMortgageMember
/ us-gaap_RangeAxis
= us-gaap_WeightedAverageMember		 2.60%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 65.20%fitb_FairValueInputsLoanClosingRates
/ us-gaap_FinancialInstrumentAxis
= us-gaap_InterestRateLockCommitmentsMember
/ us-gaap_RangeAxis
= us-gaap_WeightedAverageMember		 68.50%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) 6 years 5 years 1 month 6 days
Expected volatility 26.50%us-gaap_FairValueAssumptionsExpectedVolatilityRate
/ us-gaap_FinancialInstrumentAxis
= us-gaap_WarrantMember
/ us-gaap_RangeAxis
= us-gaap_WeightedAverageMember		 [1] 25.40%us-gaap_FairValueAssumptionsExpectedVolatilityRate
/ us-gaap_FinancialInstrumentAxis
= us-gaap_WarrantMember
/ us-gaap_RangeAxis
= us-gaap_WeightedAverageMember		 [1]
[1] Based on historical and implied volatilities of comparable companies assuming similar expected terms.