Quarterly report pursuant to Section 13 or 15(d)

Variable Interest Entities (Trust preferred Securities) (Details 1)

v2.4.1.9
Variable Interest Entities (Trust preferred Securities) (Details 1) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Dec. 31, 2014
Summary of Outstanding Trust Preferred Securities    
Principal amount of subordinated note/ debenture issued to trust $ 317,082us-gaap_DebtInstrumentCarryingAmount  
Investment in unconsolidated subsidiary 13,919hban_InvestmentInUnconsolidatedSubsidiary  
Summary of Outstanding Trust Preferred Securities (Textuals) [Abstract]    
Variable rate basis three month LIBOR  
Unconsolidated Trusts [Member]    
Summary of Outstanding Trust Preferred Securities    
Maximum exposure to loss 494,458us-gaap_VariableInterestEntityEntityMaximumLossExposureAmount
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= hban_TotalUnconsolidatedVIEMember 		513,594us-gaap_VariableInterestEntityEntityMaximumLossExposureAmount
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= hban_TotalUnconsolidatedVIEMember
Sky Financial Capital Trust IV [Member]    
Summary of Outstanding Trust Preferred Securities    
Interest rate on Trust Preferred Securities 1.66%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= hban_SkyFinancialCapitalTrustIVMember 		[1]  
Principal amount of subordinated note/ debenture issued to trust 74,320us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= hban_SkyFinancialCapitalTrustIVMember 		[2]  
Investment in unconsolidated subsidiary 2,320hban_InvestmentInUnconsolidatedSubsidiary
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= hban_SkyFinancialCapitalTrustIVMember 		 
Summary of Outstanding Trust Preferred Securities (Textuals) [Abstract]    
Rate spread over three month LIBOR 1.40%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= hban_SkyFinancialCapitalTrustIVMember 		 
Sky Financial Capital Trust III [Member]    
Summary of Outstanding Trust Preferred Securities    
Interest rate on Trust Preferred Securities 1.68%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= hban_SkyFinancialCapitalTrustIIIMember 		[1]  
Principal amount of subordinated note/ debenture issued to trust 72,165us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= hban_SkyFinancialCapitalTrustIIIMember 		[2]  
Investment in unconsolidated subsidiary 2,165hban_InvestmentInUnconsolidatedSubsidiary
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= hban_SkyFinancialCapitalTrustIIIMember 		 
Summary of Outstanding Trust Preferred Securities (Textuals) [Abstract]    
Rate spread over three month LIBOR 1.40%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= hban_SkyFinancialCapitalTrustIIIMember 		 
Huntington Capital II [Member]    
Summary of Outstanding Trust Preferred Securities    
Interest rate on Trust Preferred Securities 0.90%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= hban_HuntingtonCapitalIiMember 		[3]  
Principal amount of subordinated note/ debenture issued to trust 54,593us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= hban_HuntingtonCapitalIiMember 		[2]  
Investment in unconsolidated subsidiary 3,093hban_InvestmentInUnconsolidatedSubsidiary
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= hban_HuntingtonCapitalIiMember 		 
Summary of Outstanding Trust Preferred Securities (Textuals) [Abstract]    
Rate spread over three month LIBOR 0.625%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= hban_HuntingtonCapitalIiMember 		 
Huntington Capital I [Member]    
Summary of Outstanding Trust Preferred Securities    
Interest rate on Trust Preferred Securities 0.96%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= hban_HuntingtonCapitalIMember 		[4]  
Principal amount of subordinated note/ debenture issued to trust 111,816us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= hban_HuntingtonCapitalIMember 		[2]  
Investment in unconsolidated subsidiary 6,186hban_InvestmentInUnconsolidatedSubsidiary
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= hban_HuntingtonCapitalIMember 		 
Summary of Outstanding Trust Preferred Securities (Textuals) [Abstract]    
Rate spread over three month LIBOR 0.70%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= hban_HuntingtonCapitalIMember 		 
Trust Preferred Securities Total [Member]    
Summary of Outstanding Trust Preferred Securities    
Maximum exposure to loss 0us-gaap_VariableInterestEntityEntityMaximumLossExposureAmount
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= hban_TrustPreferredSecuritiesTotalMember 		0us-gaap_VariableInterestEntityEntityMaximumLossExposureAmount
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= hban_TrustPreferredSecuritiesTotalMember
2011 Automobile Trust [Member]    
Summary of Outstanding Trust Preferred Securities    
Maximum exposure to loss 630us-gaap_VariableInterestEntityEntityMaximumLossExposureAmount
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= hban_Trust2011UnconsolidatedMember 		944us-gaap_VariableInterestEntityEntityMaximumLossExposureAmount
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= hban_Trust2011UnconsolidatedMember
Tower Hill Securities [Member]    
Summary of Outstanding Trust Preferred Securities    
Maximum exposure to loss 49,516us-gaap_VariableInterestEntityEntityMaximumLossExposureAmount
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= hban_TowerHillSecuritiesMember 		55,611us-gaap_VariableInterestEntityEntityMaximumLossExposureAmount
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= hban_TowerHillSecuritiesMember
Low Income Housing Tax Credit Partnerships [Member]    
Summary of Outstanding Trust Preferred Securities    
Maximum exposure to loss 358,015us-gaap_VariableInterestEntityEntityMaximumLossExposureAmount
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= hban_LowIncomeHousingTaxCreditPartnersMember 		368,283us-gaap_VariableInterestEntityEntityMaximumLossExposureAmount
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= hban_LowIncomeHousingTaxCreditPartnersMember
2012-1 Automobile Trust [Member]    
Summary of Outstanding Trust Preferred Securities    
Maximum exposure to loss 1,465us-gaap_VariableInterestEntityEntityMaximumLossExposureAmount
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= hban_Trust2012UnconsolidatedMember 		2,136us-gaap_VariableInterestEntityEntityMaximumLossExposureAmount
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= hban_Trust2012UnconsolidatedMember
2012-2 Automobile Trust [Member]    
Summary of Outstanding Trust Preferred Securities    
Maximum exposure to loss 2,489us-gaap_VariableInterestEntityEntityMaximumLossExposureAmount
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= hban_Trust2012Unconsolidated2Member 		3,220us-gaap_VariableInterestEntityEntityMaximumLossExposureAmount
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= hban_Trust2012Unconsolidated2Member
Camco Trust [Member]    
Summary of Outstanding Trust Preferred Securities    
Interest rate on Trust Preferred Securities 2.70%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= hban_CamcoTrustMember 		[5]  
Principal amount of subordinated note/ debenture issued to trust 4,188us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= hban_CamcoTrustMember 		[5]  
Investment in unconsolidated subsidiary $ 155hban_InvestmentInUnconsolidatedSubsidiary
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= hban_CamcoTrustMember 		 
[1]
Variable effective rate at March 31, 2015, based on three month LIBOR + 1.40.
[2]
Represents the principal amount of debentures issued to each trust, including unamortized original issue discount.
[3]
Variable effective rate at March 31, 2015, based on three month LIBOR + 0.625.
[4]
Variable effective rate at March 31, 2015, based on three month LIBOR + 0.70.
[5]
Variable effective rate (including impact of purchase accounting accretion) at March 31, 2015, based on three month LIBOR + 1.33.