Annual report pursuant to Section 13 and 15(d)

Fair Values of Assets and Liabilities (Fair value option-changes in fair value) (Details 4)

v2.4.1.9
Fair Values of Assets and Liabilities (Fair value option-changes in fair value) (Details 4) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Mortgages Held For Sale      
Fair Value, Option, Quantitative Disclosures [Line Items]      
Fair Value, Option, Changes in Fair Value, Gain (Loss) $ (1,978)us-gaap_FairValueOptionChangesInFairValueGainLoss1
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= hban_FairValueMeasuredOnRecurringBasisMortgagesHeldForSaleMember 		$ (12,711)us-gaap_FairValueOptionChangesInFairValueGainLoss1
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= hban_FairValueMeasuredOnRecurringBasisMortgagesHeldForSaleMember 		$ 4,284us-gaap_FairValueOptionChangesInFairValueGainLoss1
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= hban_FairValueMeasuredOnRecurringBasisMortgagesHeldForSaleMember
Automobile Loans      
Fair Value, Option, Quantitative Disclosures [Line Items]      
Fair Value, Option, Changes in Fair Value, Gain (Loss) (918)us-gaap_FairValueOptionChangesInFairValueGainLoss1
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= hban_FairValueMeasuredOnRecurringBasisAutomobileLoanMember 		(360)us-gaap_FairValueOptionChangesInFairValueGainLoss1
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= hban_FairValueMeasuredOnRecurringBasisAutomobileLoanMember 		(1,231)us-gaap_FairValueOptionChangesInFairValueGainLoss1
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= hban_FairValueMeasuredOnRecurringBasisAutomobileLoanMember
Fair Value, Option, Credit Risk, Gains (Losses) on Assets 911us-gaap_FairValueOptionCreditRiskGainsLossesOnAssets
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= hban_FairValueMeasuredOnRecurringBasisAutomobileLoanMember 		2,207us-gaap_FairValueOptionCreditRiskGainsLossesOnAssets
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= hban_FairValueMeasuredOnRecurringBasisAutomobileLoanMember 		2,749us-gaap_FairValueOptionCreditRiskGainsLossesOnAssets
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= hban_FairValueMeasuredOnRecurringBasisAutomobileLoanMember
Securitization Trust Notes Payable      
Fair Value, Option, Quantitative Disclosures [Line Items]      
Fair Value, Option, Changes in Fair Value, Gain (Loss) $ 0us-gaap_FairValueOptionChangesInFairValueGainLoss1
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= hban_FairValueLiabilitiesMeasuredOnRecurringBasisSecuritizationTrustNotesPayableMember 		$ 0us-gaap_FairValueOptionChangesInFairValueGainLoss1
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= hban_FairValueLiabilitiesMeasuredOnRecurringBasisSecuritizationTrustNotesPayableMember 		$ (2,023)us-gaap_FairValueOptionChangesInFairValueGainLoss1
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= hban_FairValueLiabilitiesMeasuredOnRecurringBasisSecuritizationTrustNotesPayableMember