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Derivative Financial Instruments (Asset and liability management) (Details Add Info)

v2.4.1.9
Derivative Financial Instruments (Asset and liability management) (Details Add Info) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Y
Additional information about the interest rate swaps used in companies Asset and Liability Management  
Notional Amount Of Interest Rate Derivatives $ 13,863,850hban_NotionalAmountOfInterestRateDerivatives1
Average Maturity (years) 2.1hban_AverageMaturityOfInterestRateDerivativeInYears
Fair Value 91,577us-gaap_InterestRateDerivativesAtFairValueNet
Weighted-Average Rate Receive 1.00%hban_WeightedAverageRateReceive
Weighted-Average Rate Pay 0.29%hban_WeightedAverageRatePay
Asset conversion swaps - Receive Fixed - Generic [Member]  
Additional information about the interest rate swaps used in companies Asset and Liability Management  
Notional Amount Of Interest Rate Derivatives 9,289,000hban_NotionalAmountOfInterestRateDerivatives1
/ us-gaap_DerivativeByNatureAxis
= hban_AssetConversionSwapsReceiveFixedGenericMember
Average Maturity (years) 1.7hban_AverageMaturityOfInterestRateDerivativeInYears
/ us-gaap_DerivativeByNatureAxis
= hban_AssetConversionSwapsReceiveFixedGenericMember
Fair Value 12,412us-gaap_InterestRateDerivativesAtFairValueNet
/ us-gaap_DerivativeByNatureAxis
= hban_AssetConversionSwapsReceiveFixedGenericMember
Weighted-Average Rate Receive 0.80%hban_WeightedAverageRateReceive
/ us-gaap_DerivativeByNatureAxis
= hban_AssetConversionSwapsReceiveFixedGenericMember
Weighted-Average Rate Pay 0.26%hban_WeightedAverageRatePay
/ us-gaap_DerivativeByNatureAxis
= hban_AssetConversionSwapsReceiveFixedGenericMember
Asset Conversion Swaps Pay Fixed Generic [Member]  
Additional information about the interest rate swaps used in companies Asset and Liability Management  
Notional Amount Of Interest Rate Derivatives 745,750hban_NotionalAmountOfInterestRateDerivatives1
/ us-gaap_DerivativeByNatureAxis
= hban_AssetConversionSwapsPayFixedGenericMember
Average Maturity (years) 1.6hban_AverageMaturityOfInterestRateDerivativeInYears
/ us-gaap_DerivativeByNatureAxis
= hban_AssetConversionSwapsPayFixedGenericMember
Fair Value (1,422)us-gaap_InterestRateDerivativesAtFairValueNet
/ us-gaap_DerivativeByNatureAxis
= hban_AssetConversionSwapsPayFixedGenericMember
Weighted-Average Rate Receive 0.00%hban_WeightedAverageRateReceive
/ us-gaap_DerivativeByNatureAxis
= hban_AssetConversionSwapsPayFixedGenericMember
Weighted-Average Rate Pay 0.79%hban_WeightedAverageRatePay
/ us-gaap_DerivativeByNatureAxis
= hban_AssetConversionSwapsPayFixedGenericMember
Liability conversion swaps - Receive Fixed - Generic [Member]  
Additional information about the interest rate swaps used in companies Asset and Liability Management  
Notional Amount Of Interest Rate Derivatives 3,829,100hban_NotionalAmountOfInterestRateDerivatives1
/ us-gaap_DerivativeByNatureAxis
= hban_LiabilityConversionSwapsReceiveFixedGenericMember
Average Maturity (years) 3.2hban_AverageMaturityOfInterestRateDerivativeInYears
/ us-gaap_DerivativeByNatureAxis
= hban_LiabilityConversionSwapsReceiveFixedGenericMember
Fair Value 80,587us-gaap_InterestRateDerivativesAtFairValueNet
/ us-gaap_DerivativeByNatureAxis
= hban_LiabilityConversionSwapsReceiveFixedGenericMember
Weighted-Average Rate Receive 1.67%hban_WeightedAverageRateReceive
/ us-gaap_DerivativeByNatureAxis
= hban_LiabilityConversionSwapsReceiveFixedGenericMember
Weighted-Average Rate Pay 0.27%hban_WeightedAverageRatePay
/ us-gaap_DerivativeByNatureAxis
= hban_LiabilityConversionSwapsReceiveFixedGenericMember
Liability Conversion Swaps - Receive Fixed - Callable  
Additional information about the interest rate swaps used in companies Asset and Liability Management  
Notional Amount Of Interest Rate Derivatives 0hban_NotionalAmountOfInterestRateDerivatives1
/ us-gaap_DerivativeByNatureAxis
= hban_LiabilityConversionSwapsReceiveFixedCallableMember
Average Maturity (years) 0hban_AverageMaturityOfInterestRateDerivativeInYears
/ us-gaap_DerivativeByNatureAxis
= hban_LiabilityConversionSwapsReceiveFixedCallableMember
Fair Value $ 0us-gaap_InterestRateDerivativesAtFairValueNet
/ us-gaap_DerivativeByNatureAxis
= hban_LiabilityConversionSwapsReceiveFixedCallableMember
Weighted-Average Rate Receive 0.00%hban_WeightedAverageRateReceive
/ us-gaap_DerivativeByNatureAxis
= hban_LiabilityConversionSwapsReceiveFixedCallableMember
Weighted-Average Rate Pay 0.00%hban_WeightedAverageRatePay
/ us-gaap_DerivativeByNatureAxis
= hban_LiabilityConversionSwapsReceiveFixedCallableMember