Annual report pursuant to Section 13 and 15(d)

Fair Values of Assets and Liabilities (Fair value option) (Details 3)

v2.4.1.9
Fair Values of Assets and Liabilities (Fair value option) (Details 3) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Mortgages Held For Sale    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Mortgages Held-for-sale, Fair Value Disclosure $ 354,888us-gaap_MortgagesHeldForSaleFairValueDisclosure
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= hban_FairValueMeasuredOnRecurringBasisMortgagesHeldForSaleMember
$ 278,928us-gaap_MortgagesHeldForSaleFairValueDisclosure
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= hban_FairValueMeasuredOnRecurringBasisMortgagesHeldForSaleMember
Mortgages Held For Sale, Unpaid Principal 340,070hban_MortgagesHeldForSaleUnpaidPrincipal
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= hban_FairValueMeasuredOnRecurringBasisMortgagesHeldForSaleMember
276,945hban_MortgagesHeldForSaleUnpaidPrincipal
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= hban_FairValueMeasuredOnRecurringBasisMortgagesHeldForSaleMember
Fair Value, Option, Aggregate Differences, Loans and Long-term Receivables 14,818us-gaap_FairValueOptionAggregateDifferencesLoansAndLongTermReceivables
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= hban_FairValueMeasuredOnRecurringBasisMortgagesHeldForSaleMember
1,983us-gaap_FairValueOptionAggregateDifferencesLoansAndLongTermReceivables
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= hban_FairValueMeasuredOnRecurringBasisMortgagesHeldForSaleMember
Automobile Loans    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Loans Receivable, Fair Value Disclosure 10,590us-gaap_LoansReceivableFairValueDisclosure
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= hban_FairValueMeasuredOnRecurringBasisAutomobileLoanMember
52,286us-gaap_LoansReceivableFairValueDisclosure
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= hban_FairValueMeasuredOnRecurringBasisAutomobileLoanMember
Loans Receivable, Unpaid Principal 10,022hban_LoansReceivableUnpaidPrincipal
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= hban_FairValueMeasuredOnRecurringBasisAutomobileLoanMember
50,800hban_LoansReceivableUnpaidPrincipal
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= hban_FairValueMeasuredOnRecurringBasisAutomobileLoanMember
Fair Value, Option, Aggregate Differences, Loans and Long-term Receivables 568us-gaap_FairValueOptionAggregateDifferencesLoansAndLongTermReceivables
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= hban_FairValueMeasuredOnRecurringBasisAutomobileLoanMember
1,486us-gaap_FairValueOptionAggregateDifferencesLoansAndLongTermReceivables
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= hban_FairValueMeasuredOnRecurringBasisAutomobileLoanMember
Securitization Trust Notes Payable    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Long-term Debt, Fair Value 0us-gaap_LongTermDebtFairValue
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= hban_FairValueLiabilitiesMeasuredOnRecurringBasisSecuritizationTrustNotesPayableMember
0us-gaap_LongTermDebtFairValue
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= hban_FairValueLiabilitiesMeasuredOnRecurringBasisSecuritizationTrustNotesPayableMember
Long-term Debt, Unpaid Principal 0hban_LongTermDebtUnpaidPrincipal
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= hban_FairValueLiabilitiesMeasuredOnRecurringBasisSecuritizationTrustNotesPayableMember
0hban_LongTermDebtUnpaidPrincipal
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= hban_FairValueLiabilitiesMeasuredOnRecurringBasisSecuritizationTrustNotesPayableMember
Fair Value, Option, Aggregate Differences, Long-term Debt Instruments $ 0us-gaap_FairValueOptionAggregateDifferencesLongTermDebtInstruments
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= hban_FairValueLiabilitiesMeasuredOnRecurringBasisSecuritizationTrustNotesPayableMember
$ 0us-gaap_FairValueOptionAggregateDifferencesLongTermDebtInstruments
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= hban_FairValueLiabilitiesMeasuredOnRecurringBasisSecuritizationTrustNotesPayableMember