Annual report pursuant to Section 13 and 15(d)

Other Long-term Debt (Details)

v2.4.1.9
Other Long-term Debt (Details) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Debt Instrument [Line Items]    
Debt Instrument, Carrying Amount $ 317,075,000us-gaap_DebtInstrumentCarryingAmount  
Long-term borrowings 4,335,962,000us-gaap_LongTermDebt 2,458,272,000us-gaap_LongTermDebt
Medium-term Notes [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Carrying Amount 38,541,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MediumTermNotesMember 		39,497,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MediumTermNotesMember
Debt Instrument, Interest Rate, Effective Percentage 5.04%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MediumTermNotesMember 		 
Securitization Trust Note Payable Due 2018 [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Maturity Date Mar. 05, 2018  
Senior Note Payable Due August 2016 [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Carrying Amount 349,499,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_LongtermDebtTypeAxis
= hban_SeniorNotePayableDueAugust2016Member 		349,858,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_LongtermDebtTypeAxis
= hban_SeniorNotePayableDueAugust2016Member
Debt Instrument, Interest Rate, Effective Percentage 1.40%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_LongtermDebtTypeAxis
= hban_SeniorNotePayableDueAugust2016Member 		 
Debt Instrument, Maturity Date Aug. 02, 2016  
DebtInstrumentFaceAmount 350,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LongtermDebtTypeAxis
= hban_SeniorNotePayableDueAugust2016Member 		 
DebtInstrumentpercentofvalue 99.87%hban_Debtinstrumentpercentfacevalue
/ us-gaap_LongtermDebtTypeAxis
= hban_SeniorNotePayableDueAugust2016Member 		 
Senior Note Payable Due November 2016 [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Carrying Amount 497,477,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_LongtermDebtTypeAxis
= hban_SeniorNotePayableDueNovember2016Member 		497,317,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_LongtermDebtTypeAxis
= hban_SeniorNotePayableDueNovember2016Member
Debt Instrument, Interest Rate, Effective Percentage 1.31%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_LongtermDebtTypeAxis
= hban_SeniorNotePayableDueNovember2016Member 		 
Debt Instrument, Maturity Date Nov. 20, 2016  
DebtInstrumentFaceAmount 500,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LongtermDebtTypeAxis
= hban_SeniorNotePayableDueNovember2016Member 		 
DebtInstrumentpercentofvalue 99.87%hban_Debtinstrumentpercentfacevalue
/ us-gaap_LongtermDebtTypeAxis
= hban_SeniorNotePayableDueNovember2016Member 		 
Senior Note Payable Due April 2017 Fixed    
Debt Instrument [Line Items]    
Debt Instrument, Carrying Amount 499,759,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_LongtermDebtTypeAxis
= hban_SeniorNotepayabledueapril2017fixedMember 		0us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_LongtermDebtTypeAxis
= hban_SeniorNotepayabledueapril2017fixedMember
Debt Instrument, Interest Rate, Effective Percentage 2.23%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_LongtermDebtTypeAxis
= hban_SeniorNotepayabledueapril2017fixedMember 		 
Debt Instrument, Maturity Date Apr. 24, 2017  
DebtInstrumentFaceAmount 500,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LongtermDebtTypeAxis
= hban_SeniorNotepayabledueapril2017fixedMember 		 
DebtInstrumentpercentofvalue 99.84%hban_Debtinstrumentpercentfacevalue
/ us-gaap_LongtermDebtTypeAxis
= hban_SeniorNotepayabledueapril2017fixedMember 		 
Senior Note Payable Due April 2017 Variable    
Debt Instrument [Line Items]    
Debt Instrument, Carrying Amount 250,000,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_LongtermDebtTypeAxis
= hban_Seniornotepayabledueapril2017variableMember 		0us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_LongtermDebtTypeAxis
= hban_Seniornotepayabledueapril2017variableMember
Debt Instrument, Interest Rate, Effective Percentage 6.67%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_LongtermDebtTypeAxis
= hban_Seniornotepayabledueapril2017variableMember 		 
Debt Instrument, Maturity Date Apr. 24, 2017  
DebtInstrumentFaceAmount 250,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LongtermDebtTypeAxis
= hban_Seniornotepayabledueapril2017variableMember 		 
DebtInstrumentpercentofvalue 100.00%hban_Debtinstrumentpercentfacevalue
/ us-gaap_LongtermDebtTypeAxis
= hban_Seniornotepayabledueapril2017variableMember 		 
Debt Instrument, Description of Variable Rate Basis three-month LIBOR  
Senior Note Payable Due April 2019 Fixed    
Debt Instrument [Line Items]    
Debt Instrument, Carrying Amount 499,760,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_LongtermDebtTypeAxis
= hban_Seniornotepayabledueapril2019fixedMember 		0us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_LongtermDebtTypeAxis
= hban_Seniornotepayabledueapril2019fixedMember
Debt Instrument, Interest Rate, Effective Percentage 1.43%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_LongtermDebtTypeAxis
= hban_Seniornotepayabledueapril2019fixedMember 		 
Debt Instrument, Maturity Date Apr. 01, 2019  
DebtInstrumentFaceAmount 500,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LongtermDebtTypeAxis
= hban_Seniornotepayabledueapril2019fixedMember 		 
DebtInstrumentpercentofvalue 99.84%hban_Debtinstrumentpercentfacevalue
/ us-gaap_LongtermDebtTypeAxis
= hban_Seniornotepayabledueapril2019fixedMember 		 
Senior Note Payable Due August 2018 [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Carrying Amount 398,924,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_LongtermDebtTypeAxis
= hban_SeniorNotePayableDueAugust2018Member 		397,306,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_LongtermDebtTypeAxis
= hban_SeniorNotePayableDueAugust2018Member
Debt Instrument, Interest Rate, Effective Percentage 2.64%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_LongtermDebtTypeAxis
= hban_SeniorNotePayableDueAugust2018Member 		 
Debt Instrument, Maturity Date Aug. 02, 2018  
DebtInstrumentFaceAmount 350,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LongtermDebtTypeAxis
= hban_SeniorNotePayableDueAugust2018Member 		 
DebtInstrumentpercentofvalue 99.87%hban_Debtinstrumentpercentfacevalue
/ us-gaap_LongtermDebtTypeAxis
= hban_SeniorNotePayableDueAugust2018Member 		 
Subordinated Notes Due 2020 [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Carrying Amount 330,105,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_LongtermDebtTypeAxis
= hban_SubordinatedNotesDue2020Member 		323,856,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_LongtermDebtTypeAxis
= hban_SubordinatedNotesDue2020Member
Debt Instrument, Interest Rate, Effective Percentage 7.00%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_LongtermDebtTypeAxis
= hban_SubordinatedNotesDue2020Member 		 
Debt Instrument, Maturity Date Dec. 15, 2020  
Junior Subordianted Debentures Due 2027 [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Carrying Amount 111,816,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_LongtermDebtTypeAxis
= hban_JuniorSubordiantedDebenturesDue2027Member 		111,816,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_LongtermDebtTypeAxis
= hban_JuniorSubordiantedDebenturesDue2027Member
Debt Instrument, Interest Rate, Effective Percentage 0.93%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_LongtermDebtTypeAxis
= hban_JuniorSubordiantedDebenturesDue2027Member 		 
Debt Instrument, Maturity Date Feb. 01, 2027  
Debt Instrument, Description of Variable Rate Basis three-month LIBOR  
Junior Subordinated Debentures Due 2028 [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Carrying Amount 54,593,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_LongtermDebtTypeAxis
= hban_JuniorSubordinatedDebenturesDue2028Member 		54,593,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_LongtermDebtTypeAxis
= hban_JuniorSubordinatedDebenturesDue2028Member
Debt Instrument, Interest Rate, Effective Percentage 0.87%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_LongtermDebtTypeAxis
= hban_JuniorSubordinatedDebenturesDue2028Member 		 
Debt Instrument, Maturity Date Jun. 15, 2028  
Debt Instrument, Description of Variable Rate Basis three-month LIBOR  
Junior Subordinated Debentures Due 2036 [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Carrying Amount 72,165,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_LongtermDebtTypeAxis
= hban_JuniorSubordinatedDebenturesDue2036Member 		72,165,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_LongtermDebtTypeAxis
= hban_JuniorSubordinatedDebenturesDue2036Member
Debt Instrument, Interest Rate, Effective Percentage 1.66%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_LongtermDebtTypeAxis
= hban_JuniorSubordinatedDebenturesDue2036Member 		 
Debt Instrument, Maturity Date Jun. 30, 2036  
Debt Instrument, Description of Variable Rate Basis three-month LIBOR  
Junior Subordinated Debentures2 Due 2036 [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Carrying Amount 74,320,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_LongtermDebtTypeAxis
= hban_JuniorSubordinatedDebentures2Due2036Member 		74,320,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_LongtermDebtTypeAxis
= hban_JuniorSubordinatedDebentures2Due2036Member
Debt Instrument, Interest Rate, Effective Percentage 1.64%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_LongtermDebtTypeAxis
= hban_JuniorSubordinatedDebentures2Due2036Member 		 
Debt Instrument, Maturity Date Jul. 01, 2036  
Debt Instrument, Description of Variable Rate Basis three-month LIBOR  
Subordinated Notes Due 2014 [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Carrying Amount 0us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_LongtermDebtTypeAxis
= hban_SubordinatedNotesDue2014Member 		125,109,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_LongtermDebtTypeAxis
= hban_SubordinatedNotesDue2014Member
Subordinated Notes Due 2016 [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Carrying Amount 105,731,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_LongtermDebtTypeAxis
= hban_SubordinatedNotesDue2016Member 		108,038,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_LongtermDebtTypeAxis
= hban_SubordinatedNotesDue2016Member
Debt Instrument, Interest Rate, Effective Percentage 5.92%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_LongtermDebtTypeAxis
= hban_SubordinatedNotesDue2016Member 		 
Debt Instrument, Maturity Date Feb. 15, 2016  
DebtInstrumentFaceAmount 103,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LongtermDebtTypeAxis
= hban_SubordinatedNotesDue2016Member 		 
Subordinated Notes Due 2018 [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Carrying Amount 140,115,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_LongtermDebtTypeAxis
= hban_SubordinatedNotesDue2018Member 		143,749,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_LongtermDebtTypeAxis
= hban_SubordinatedNotesDue2018Member
Debt Instrument, Interest Rate, Effective Percentage 6.68%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_LongtermDebtTypeAxis
= hban_SubordinatedNotesDue2018Member 		 
Debt Instrument, Maturity Date Jun. 15, 2018  
DebtInstrumentFaceAmount 125,500,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LongtermDebtTypeAxis
= hban_SubordinatedNotesDue2018Member 		 
Federal Home Loan Bank Advances [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Carrying Amount 758,052,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_FederalHomeLoanBankAdvancesMember 		8,293,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_FederalHomeLoanBankAdvancesMember
Debt Instrument, Interest Rate, Effective Percentage 0.21%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_FederalHomeLoanBankAdvancesMember 		 
DebtInstrumentFaceAmount 2,100,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_FederalHomeLoanBankAdvancesMember 		 
Subordinated Notes Due 2019 [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Carrying Amount 85,783,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_LongtermDebtTypeAxis
= hban_SubordinatedNotesDue2019Member 		87,214,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_LongtermDebtTypeAxis
= hban_SubordinatedNotesDue2019Member
Debt Instrument, Interest Rate, Effective Percentage 5.45%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_LongtermDebtTypeAxis
= hban_SubordinatedNotesDue2019Member 		 
Debt Instrument, Maturity Date Feb. 28, 2019  
DebtInstrumentFaceAmount 75,700,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LongtermDebtTypeAxis
= hban_SubordinatedNotesDue2019Member 		 
Securitization Trust and Franklin Trust Other Debt [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Carrying Amount 65,141,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_LongtermDebtTypeAxis
= hban_SecuritizationTrustAndFranklinTrustOtherDebtMember 		65,141,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_LongtermDebtTypeAxis
= hban_SecuritizationTrustAndFranklinTrustOtherDebtMember
Camco Statutory Trust Due 2037 [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Carrying Amount $ 4,181,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_LongtermDebtTypeAxis
= hban_CamcoStatutoryTrustDue2037Member 		$ 0us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_LongtermDebtTypeAxis
= hban_CamcoStatutoryTrustDue2037Member
Debt Instrument, Interest Rate, Effective Percentage 2.71%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_LongtermDebtTypeAxis
= hban_CamcoStatutoryTrustDue2037Member 		 
Debt Instrument, Maturity Date Sep. 15, 2037  
Debt Instrument, Description of Variable Rate Basis three-month LIBOR