Annual report pursuant to Section 13 and 15(d)

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

v2.4.1.9
Derivative Financial Instruments (Asset and liability management) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Notional Amount Of Derivatives [Abstract]  
Derivative, Notional Amount $ 12,129,100invest_DerivativeNotionalAmount
Cash flow hedging [Member]  
Notional Amount Of Derivatives [Abstract]  
Derivative, Notional Amount 9,300,000invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember
Fair Value Hedging [Member]  
Notional Amount Of Derivatives [Abstract]  
Derivative, Notional Amount 2,829,100invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_FairValueHedgingMember
Loan [Member]  
Notional Amount Of Derivatives [Abstract]  
Derivative, Notional Amount 9,300,000invest_DerivativeNotionalAmount
/ us-gaap_UnderlyingAssetClassAxis
= us-gaap_LoansPayableMember
Loan [Member] | Cash flow hedging [Member]  
Notional Amount Of Derivatives [Abstract]  
Derivative, Notional Amount 9,300,000invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember
/ us-gaap_UnderlyingAssetClassAxis
= us-gaap_LoansPayableMember
Loan [Member] | Fair Value Hedging [Member]  
Notional Amount Of Derivatives [Abstract]  
Derivative, Notional Amount 0invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_FairValueHedgingMember
/ us-gaap_UnderlyingAssetClassAxis
= us-gaap_LoansPayableMember
Investment securities [Member]  
Notional Amount Of Derivatives [Abstract]  
Derivative, Notional Amount 0invest_DerivativeNotionalAmount
/ us-gaap_UnderlyingAssetClassAxis
= us-gaap_SecuritiesInvestmentMember
Investment securities [Member] | Cash flow hedging [Member]  
Notional Amount Of Derivatives [Abstract]  
Derivative, Notional Amount 0invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember
/ us-gaap_UnderlyingAssetClassAxis
= us-gaap_SecuritiesInvestmentMember
Investment securities [Member] | Fair Value Hedging [Member]  
Notional Amount Of Derivatives [Abstract]  
Derivative, Notional Amount 0invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_FairValueHedgingMember
/ us-gaap_UnderlyingAssetClassAxis
= us-gaap_SecuritiesInvestmentMember
Deposits [Member]  
Notional Amount Of Derivatives [Abstract]  
Derivative, Notional Amount 69,100invest_DerivativeNotionalAmount
/ us-gaap_UnderlyingAssetClassAxis
= us-gaap_DepositsMember
Deposits [Member] | Cash flow hedging [Member]  
Notional Amount Of Derivatives [Abstract]  
Derivative, Notional Amount 0invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember
/ us-gaap_UnderlyingAssetClassAxis
= us-gaap_DepositsMember
Deposits [Member] | Fair Value Hedging [Member]  
Notional Amount Of Derivatives [Abstract]  
Derivative, Notional Amount 69,100invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_FairValueHedgingMember
/ us-gaap_UnderlyingAssetClassAxis
= us-gaap_DepositsMember
Subordinated notes  
Notional Amount Of Derivatives [Abstract]  
Derivative, Notional Amount 475,000invest_DerivativeNotionalAmount
/ us-gaap_UnderlyingAssetClassAxis
= hban_SubordinatedNotesMember
Subordinated notes | Cash flow hedging [Member]  
Notional Amount Of Derivatives [Abstract]  
Derivative, Notional Amount 0invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember
/ us-gaap_UnderlyingAssetClassAxis
= hban_SubordinatedNotesMember
Subordinated notes | Fair Value Hedging [Member]  
Notional Amount Of Derivatives [Abstract]  
Derivative, Notional Amount 475,000invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_FairValueHedgingMember
/ us-gaap_UnderlyingAssetClassAxis
= hban_SubordinatedNotesMember
Other long-term debt  
Notional Amount Of Derivatives [Abstract]  
Derivative, Notional Amount 2,285,000invest_DerivativeNotionalAmount
/ us-gaap_UnderlyingAssetClassAxis
= hban_OtherLongTermDebtMember
Other long-term debt | Cash flow hedging [Member]  
Notional Amount Of Derivatives [Abstract]  
Derivative, Notional Amount 0invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember
/ us-gaap_UnderlyingAssetClassAxis
= hban_OtherLongTermDebtMember
Other long-term debt | Fair Value Hedging [Member]  
Notional Amount Of Derivatives [Abstract]  
Derivative, Notional Amount $ 2,285,000invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_FairValueHedgingMember
/ us-gaap_UnderlyingAssetClassAxis
= hban_OtherLongTermDebtMember