XML 59 R188.htm IDEA: XBRL DOCUMENT v2.4.1.9
Fair Values of Assets and Liabilities (Significant Unobservable Level 3 Inputs Nonrecurring Basis) (Detail) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Commercial Loans Held For Sale    
Fair Value Inputs [Line Items]    
Fair value measurements nonrecurring assets 33fitb_FairValueInputsNonrecurringAssets
/ us-gaap_FinancialInstrumentAxis
= fitb_CommercialloansheldforsalememberMember		 3fitb_FairValueInputsNonrecurringAssets
/ us-gaap_FinancialInstrumentAxis
= fitb_CommercialloansheldforsalememberMember
Residential Mortgagel Loans Held For Sale    
Fair Value Inputs [Line Items]    
Fair value measurements nonrecurring assets 554fitb_FairValueInputsNonrecurringAssets
/ us-gaap_FinancialInstrumentAxis
= fitb_ResidentialMortgagelLoansHeldForSaleMember		  
Commercial and Industrial Loans    
Fair Value Inputs [Line Items]    
Fair value measurements nonrecurring assets 456fitb_FairValueInputsNonrecurringAssets
/ us-gaap_FinancialInstrumentAxis
= fitb_CommercialAndIndustrialLoansMember		 443fitb_FairValueInputsNonrecurringAssets
/ us-gaap_FinancialInstrumentAxis
= fitb_CommercialAndIndustrialLoansMember
Commercial Mortgage Loans    
Fair Value Inputs [Line Items]    
Fair value measurements nonrecurring assets 110fitb_FairValueInputsNonrecurringAssets
/ us-gaap_FinancialInstrumentAxis
= fitb_CommercialMortgageLoansMember		 61fitb_FairValueInputsNonrecurringAssets
/ us-gaap_FinancialInstrumentAxis
= fitb_CommercialMortgageLoansMember
Commercial Construction Loans    
Fair Value Inputs [Line Items]    
Fair value measurements nonrecurring assets 23fitb_FairValueInputsNonrecurringAssets
/ us-gaap_FinancialInstrumentAxis
= fitb_CommercialConstructionLoansMember		 16fitb_FairValueInputsNonrecurringAssets
/ us-gaap_FinancialInstrumentAxis
= fitb_CommercialConstructionLoansMember
Mortgage Servicing Rights    
Fair Value Inputs [Line Items]    
Fair value measurements nonrecurring assets 856fitb_FairValueInputsNonrecurringAssets
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ServicingContractsMember		 967fitb_FairValueInputsNonrecurringAssets
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ServicingContractsMember
OREO Property    
Fair Value Inputs [Line Items]    
Fair value measurements nonrecurring assets 90fitb_FairValueInputsNonrecurringAssets
/ us-gaap_FinancialInstrumentAxis
= fitb_OREOPropertyMember		 87fitb_FairValueInputsNonrecurringAssets
/ us-gaap_FinancialInstrumentAxis
= fitb_OREOPropertyMember
Bank premises and equipment    
Fair Value Inputs [Line Items]    
Fair value measurements nonrecurring assets 22fitb_FairValueInputsNonrecurringAssets
/ us-gaap_FinancialInstrumentAxis
= us-gaap_PropertyPlantAndEquipmentMember		 8fitb_FairValueInputsNonrecurringAssets
/ us-gaap_FinancialInstrumentAxis
= us-gaap_PropertyPlantAndEquipmentMember
Private equity investment funds    
Fair Value Inputs [Line Items]    
Fair value measurements nonrecurring assets   44fitb_FairValueInputsNonrecurringAssets
/ us-gaap_FinancialInstrumentAxis
= us-gaap_PrivateEquityFundsMember		 [1]
Minimum | Mortgage Servicing Rights    
Fair Value Inputs [Line Items]    
Prepayment speed 0.00%us-gaap_FairValueInputsPrepaymentRate
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ServicingContractsMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		 0.00%us-gaap_FairValueInputsPrepaymentRate
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ServicingContractsMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
Discount rate 9.60%us-gaap_FairValueInputsDiscountRate
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ServicingContractsMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		 9.40%us-gaap_FairValueInputsDiscountRate
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ServicingContractsMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
Minimum | Private equity investment funds    
Fair Value Inputs [Line Items]    
Fair Value Inputs Liquidity Discount   0.00%fitb_FairValueInputsLiquidityDiscount
/ us-gaap_FinancialInstrumentAxis
= us-gaap_PrivateEquityFundsMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
Maximum | Mortgage Servicing Rights    
Fair Value Inputs [Line Items]    
Prepayment speed 100.00%us-gaap_FairValueInputsPrepaymentRate
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ServicingContractsMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		 100.00%us-gaap_FairValueInputsPrepaymentRate
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ServicingContractsMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
Discount rate 13.20%us-gaap_FairValueInputsDiscountRate
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ServicingContractsMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		 18.00%us-gaap_FairValueInputsDiscountRate
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ServicingContractsMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
Maximum | Private equity investment funds    
Fair Value Inputs [Line Items]    
Fair Value Inputs Liquidity Discount   18.00%fitb_FairValueInputsLiquidityDiscount
/ us-gaap_FinancialInstrumentAxis
= us-gaap_PrivateEquityFundsMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
Weighted average | Commercial Loans Held For Sale    
Fair Value Inputs [Line Items]    
Cost to sell 10.00%fitb_FairValueInputsCostToSell
/ us-gaap_FinancialInstrumentAxis
= fitb_CommercialloansheldforsalememberMember
/ us-gaap_RangeAxis
= us-gaap_WeightedAverageMember		 10.00%fitb_FairValueInputsCostToSell
/ us-gaap_FinancialInstrumentAxis
= fitb_CommercialloansheldforsalememberMember
/ us-gaap_RangeAxis
= us-gaap_WeightedAverageMember
Weighted average | Residential Mortgagel Loans Held For Sale    
Fair Value Inputs [Line Items]    
Estimated sales proceeds from comparable transactions 15.00%us-gaap_FairValueInputsComparabilityAdjustments
/ us-gaap_FinancialInstrumentAxis
= fitb_ResidentialMortgagelLoansHeldForSaleMember
/ us-gaap_RangeAxis
= us-gaap_WeightedAverageMember		  
Weighted average | Private equity investment funds    
Fair Value Inputs [Line Items]    
Fair Value Inputs Liquidity Discount   3.00%fitb_FairValueInputsLiquidityDiscount
/ us-gaap_FinancialInstrumentAxis
= us-gaap_PrivateEquityFundsMember
/ us-gaap_RangeAxis
= us-gaap_WeightedAverageMember
Fixed Rate | Mortgage Servicing Rights    
Fair Value Inputs [Line Items]    
Prepayment speed 12.00%us-gaap_FairValueInputsPrepaymentRate
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ServicingContractsMember
/ us-gaap_RangeAxis
= fitb_FixedRateMember		 10.30%us-gaap_FairValueInputsPrepaymentRate
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ServicingContractsMember
/ us-gaap_RangeAxis
= fitb_FixedRateMember
Discount rate 9.90%us-gaap_FairValueInputsDiscountRate
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ServicingContractsMember
/ us-gaap_RangeAxis
= fitb_FixedRateMember		 10.40%us-gaap_FairValueInputsDiscountRate
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ServicingContractsMember
/ us-gaap_RangeAxis
= fitb_FixedRateMember
Adjustable | Mortgage Servicing Rights    
Fair Value Inputs [Line Items]    
Prepayment speed 26.20%us-gaap_FairValueInputsPrepaymentRate
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ServicingContractsMember
/ us-gaap_RangeAxis
= us-gaap_AdjustableRateLoansMember		 25.60%us-gaap_FairValueInputsPrepaymentRate
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ServicingContractsMember
/ us-gaap_RangeAxis
= us-gaap_AdjustableRateLoansMember
Discount rate 11.80%us-gaap_FairValueInputsDiscountRate
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ServicingContractsMember
/ us-gaap_RangeAxis
= us-gaap_AdjustableRateLoansMember		 11.60%us-gaap_FairValueInputsDiscountRate
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ServicingContractsMember
/ us-gaap_RangeAxis
= us-gaap_AdjustableRateLoansMember
[1] Includes funds the Bancorp will be prohibited from retaining after the July 21, 2016 end of the conformance period for the final rules, adopted under the BHCA, that implemented the provision of the Dodd-Frank Wall Street Reform and Consumer Protection Act, commonly referred to as the Volcker Rule.