XML 50 R121.htm IDEA: XBRL DOCUMENT v2.4.1.9
Notional Amounts and Fair Values for All Derivative Instruments Included in the Consolidated Balance Sheets (Detail) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Derivatives, Fair Value [Line Items]    
Fair value - Derivative Assets $ 2,080us-gaap_DerivativeFairValueOfDerivativeAsset $ 1,553us-gaap_DerivativeFairValueOfDerivativeAsset
Fair value - Derivative Liabilities 1,043us-gaap_DerivativeFairValueOfDerivativeLiability 754us-gaap_DerivativeFairValueOfDerivativeLiability
Accumulated Net Gain (Loss) from Designated or Qualifying Hedges    
Derivatives, Fair Value [Line Items]    
Fair value - Derivative Assets 435us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_HedgingDesignationAxis
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Accumulated Net Gain (Loss) from Designated or Qualifying Hedges | Fair Value Hedging    
Derivatives, Fair Value [Line Items]    
Fair value - Derivative Assets 399us-gaap_DerivativeFairValueOfDerivativeAsset
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Accumulated Net Gain (Loss) from Designated or Qualifying Hedges | Fair Value Hedging | Interest Rate Swap | Long-Term Debt    
Derivatives, Fair Value [Line Items]    
Notional amount 2,205invest_DerivativeNotionalAmount
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Accumulated Net Gain (Loss) from Designated or Qualifying Hedges | Cash Flow Hedging    
Derivatives, Fair Value [Line Items]    
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Accumulated Net Gain (Loss) from Designated or Qualifying Hedges | Cash Flow Hedging | Interest Rate Swap | Commercial and Industrial Loans    
Derivatives, Fair Value [Line Items]    
Notional amount 3,150invest_DerivativeNotionalAmount
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Nondesignated    
Derivatives, Fair Value [Line Items]    
Fair value - Derivative Assets 1,645us-gaap_DerivativeFairValueOfDerivativeAsset
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Fair value - Derivative Liabilities 1,043us-gaap_DerivativeFairValueOfDerivativeLiability
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Nondesignated | Risk Management and Other Business Purposes    
Derivatives, Fair Value [Line Items]    
Fair value - Derivative Assets 596us-gaap_DerivativeFairValueOfDerivativeAsset
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Fair value - Derivative Liabilities 55us-gaap_DerivativeFairValueOfDerivativeLiability
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Nondesignated | Risk Management and Other Business Purposes | Interest Rate Contract | Servicing Rights    
Derivatives, Fair Value [Line Items]    
Notional amount 4,487invest_DerivativeNotionalAmount
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Fair value - Derivative Assets 181us-gaap_DerivativeFairValueOfDerivativeAsset
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Fair value - Derivative Liabilities   14us-gaap_DerivativeFairValueOfDerivativeLiability
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Nondesignated | Risk Management and Other Business Purposes | Forward Contracts | Assets Held-for-sale    
Derivatives, Fair Value [Line Items]    
Notional amount 999invest_DerivativeNotionalAmount
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Fair value - Derivative Assets   13us-gaap_DerivativeFairValueOfDerivativeAsset
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Fair value - Derivative Liabilities 6us-gaap_DerivativeFairValueOfDerivativeLiability
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Nondesignated | Risk Management and Other Business Purposes | Warrant    
Derivatives, Fair Value [Line Items]    
Notional amount 691invest_DerivativeNotionalAmount
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Fair value - Derivative Assets 415us-gaap_DerivativeFairValueOfDerivativeAsset
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Nondesignated | Risk Management and Other Business Purposes | Swap    
Derivatives, Fair Value [Line Items]    
Notional amount 1,092invest_DerivativeNotionalAmount
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Fair value - Derivative Liabilities 49us-gaap_DerivativeFairValueOfDerivativeLiability
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Nondesignated | Customer Accommodation    
Derivatives, Fair Value [Line Items]    
Fair value - Derivative Assets 1,049us-gaap_DerivativeFairValueOfDerivativeAsset
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Fair value - Derivative Liabilities 988us-gaap_DerivativeFairValueOfDerivativeLiability
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Nondesignated | Customer Accommodation | Interest Rate Contract    
Derivatives, Fair Value [Line Items]    
Notional amount 29,558invest_DerivativeNotionalAmount
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Fair value - Derivative Assets 272us-gaap_DerivativeFairValueOfDerivativeAsset
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Fair value - Derivative Liabilities 278us-gaap_DerivativeFairValueOfDerivativeLiability
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Nondesignated | Customer Accommodation | Interest Rate Lock Commitments    
Derivatives, Fair Value [Line Items]    
Notional amount 613invest_DerivativeNotionalAmount
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Fair value - Derivative Assets 12us-gaap_DerivativeFairValueOfDerivativeAsset
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Fair value - Derivative Liabilities   1us-gaap_DerivativeFairValueOfDerivativeLiability
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Nondesignated | Customer Accommodation | Commodity Contract    
Derivatives, Fair Value [Line Items]    
Notional amount 3,558invest_DerivativeNotionalAmount
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Fair value - Derivative Assets 348us-gaap_DerivativeFairValueOfDerivativeAsset
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Fair value - Derivative Liabilities 338us-gaap_DerivativeFairValueOfDerivativeLiability
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Nondesignated | Customer Accommodation | Foreign Exchange Contract    
Derivatives, Fair Value [Line Items]    
Notional amount 16,745invest_DerivativeNotionalAmount
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/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember		 19,688invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
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/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
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Fair value - Derivative Assets 417us-gaap_DerivativeFairValueOfDerivativeAsset
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/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
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/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember		 276us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_DerivativeInstrumentRiskAxis
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/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
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/ us-gaap_HedgingDesignationAxis
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Fair value - Derivative Liabilities $ 372us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_DerivativeInstrumentRiskAxis
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/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= fitb_CustomerAccommodationMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember		 $ 252us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_DerivativeInstrumentRiskAxis
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/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
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/ us-gaap_HedgingDesignationAxis
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