Annual report pursuant to Section 13 and 15(d)

Loans sales and securitizations (Details Textuals)

v2.4.1.9
Loans sales and securitizations (Details Textuals) (USD $)
3 Months Ended 12 Months Ended
Sep. 30, 2014
Mar. 31, 2014
Sep. 30, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Loans sales and securitizations (Textuals) [Abstract]              
Total of automobile loans transferred in securitization transactions $ 1,300,000,000hban_TotalOfAutomobileLoansTransferredInSecuritizationTransaction $ 1,000,000,000hban_TotalOfAutomobileLoansTransferredInSecuritizationTransaction $ 1,000,000,000hban_TotalOfAutomobileLoansTransferredInSecuritizationTransaction        
Residential Mortgage [Member]              
Loans sales and securitizations (Textuals) [Abstract]              
Servicing income       44,300,000us-gaap_ContractuallySpecifiedServicingFeesLateFeesAndAncillaryFeesEarnedInExchangeForServicingFinancialAssets
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ResidentialMortgageMember
43,800,000us-gaap_ContractuallySpecifiedServicingFeesLateFeesAndAncillaryFeesEarnedInExchangeForServicingFinancialAssets
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ResidentialMortgageMember
46,200,000us-gaap_ContractuallySpecifiedServicingFeesLateFeesAndAncillaryFeesEarnedInExchangeForServicingFinancialAssets
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ResidentialMortgageMember
 
Unpaid principal balance of third party serviced loans       15,600,000,000hban_UnpaidPrincipalBalanceOfThirdPartyServicedLoans
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ResidentialMortgageMember
15,200,000,000hban_UnpaidPrincipalBalanceOfThirdPartyServicedLoans
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ResidentialMortgageMember
  15,600,000,000hban_UnpaidPrincipalBalanceOfThirdPartyServicedLoans
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ResidentialMortgageMember
Automobile Loan [Member]              
Loans sales and securitizations (Textuals) [Abstract]              
Servicing income       7,700,000us-gaap_ContractuallySpecifiedServicingFeesLateFeesAndAncillaryFeesEarnedInExchangeForServicingFinancialAssets
/ us-gaap_FinancialInstrumentAxis
= us-gaap_AutomobileLoanMember
10,300,000us-gaap_ContractuallySpecifiedServicingFeesLateFeesAndAncillaryFeesEarnedInExchangeForServicingFinancialAssets
/ us-gaap_FinancialInstrumentAxis
= us-gaap_AutomobileLoanMember
8,700,000us-gaap_ContractuallySpecifiedServicingFeesLateFeesAndAncillaryFeesEarnedInExchangeForServicingFinancialAssets
/ us-gaap_FinancialInstrumentAxis
= us-gaap_AutomobileLoanMember
 
Total loans transferred in securitization transactions       0us-gaap_ContinuingInvolvementWithTransferredFinancialAssetsPrincipalAmountOutstanding
/ us-gaap_FinancialInstrumentAxis
= us-gaap_AutomobileLoanMember
0us-gaap_ContinuingInvolvementWithTransferredFinancialAssetsPrincipalAmountOutstanding
/ us-gaap_FinancialInstrumentAxis
= us-gaap_AutomobileLoanMember
  2,300,018,000us-gaap_ContinuingInvolvementWithTransferredFinancialAssetsPrincipalAmountOutstanding
/ us-gaap_FinancialInstrumentAxis
= us-gaap_AutomobileLoanMember
Gain or loss from sale of loans in securitizations and sales       0us-gaap_SecuritizationFinancialAssetForWhichTransferIsAccountedAsSaleGainLossOnSale
/ us-gaap_FinancialInstrumentAxis
= us-gaap_AutomobileLoanMember
0us-gaap_SecuritizationFinancialAssetForWhichTransferIsAccountedAsSaleGainLossOnSale
/ us-gaap_FinancialInstrumentAxis
= us-gaap_AutomobileLoanMember
42,251,000us-gaap_SecuritizationFinancialAssetForWhichTransferIsAccountedAsSaleGainLossOnSale
/ us-gaap_FinancialInstrumentAxis
= us-gaap_AutomobileLoanMember
 
Unpaid principal balance of third party serviced loans       800,000,000hban_UnpaidPrincipalBalanceOfThirdPartyServicedLoans
/ us-gaap_FinancialInstrumentAxis
= us-gaap_AutomobileLoanMember
1,600,000,000hban_UnpaidPrincipalBalanceOfThirdPartyServicedLoans
/ us-gaap_FinancialInstrumentAxis
= us-gaap_AutomobileLoanMember
  2,500,000,000hban_UnpaidPrincipalBalanceOfThirdPartyServicedLoans
/ us-gaap_FinancialInstrumentAxis
= us-gaap_AutomobileLoanMember
Small Business Association (SBA) Loan [Member]              
Loans sales and securitizations (Textuals) [Abstract]              
Servicing income       7,400,000us-gaap_ContractuallySpecifiedServicingFeesLateFeesAndAncillaryFeesEarnedInExchangeForServicingFinancialAssets
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
6,300,000us-gaap_ContractuallySpecifiedServicingFeesLateFeesAndAncillaryFeesEarnedInExchangeForServicingFinancialAssets
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
5,700,000us-gaap_ContractuallySpecifiedServicingFeesLateFeesAndAncillaryFeesEarnedInExchangeForServicingFinancialAssets
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
 
Unpaid principal balance of third party serviced loans       $ 898,000,000us-gaap_PrincipalAmountOutstandingOnLoansManagedAndSecuritized
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
$ 885,400,000us-gaap_PrincipalAmountOutstandingOnLoansManagedAndSecuritized
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
  $ 758,300,000us-gaap_PrincipalAmountOutstandingOnLoansManagedAndSecuritized
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember