Quarterly report pursuant to Section 13 or 15(d)

Loans sales and securitizations (Details Textuals)

v2.4.1.9
Loans sales and securitizations (Details Textuals) (USD $)
 3 Months Ended
Dec. 31, 2012
Mar. 31, 2012
Sep. 30, 2011
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Loans sales and securitizations (Textuals) [Abstract]            
Total of automobile loans transferred in securitization transactions $ 1,000,000,000hban_TotalOfAutomobileLoansTransferredInSecuritizationTransaction $ 1,300,000,000hban_TotalOfAutomobileLoansTransferredInSecuritizationTransaction $ 1,000,000,000hban_TotalOfAutomobileLoansTransferredInSecuritizationTransaction      
Residential Mortgage [Member]            
Loans sales and securitizations (Textuals) [Abstract]            
Servicing income       3,900,000us-gaap_ContractuallySpecifiedServicingFeesLateFeesAndAncillaryFeesEarnedInExchangeForServicingFinancialAssets
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ResidentialMortgageMember 		5,000,000us-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 		  15,600,000,000hban_UnpaidPrincipalBalanceOfThirdPartyServicedLoans
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ResidentialMortgageMember
Automobile Loan [Member]            
Loans sales and securitizations (Textuals) [Abstract]            
Servicing income       1,400,000us-gaap_ContractuallySpecifiedServicingFeesLateFeesAndAncillaryFeesEarnedInExchangeForServicingFinancialAssets
/ us-gaap_FinancialInstrumentAxis
= us-gaap_AutomobileLoanMember 		2,100,000us-gaap_ContractuallySpecifiedServicingFeesLateFeesAndAncillaryFeesEarnedInExchangeForServicingFinancialAssets
/ us-gaap_FinancialInstrumentAxis
= us-gaap_AutomobileLoanMember 		 
Unpaid principal balance of third party serviced loans       697,200,000,000hban_UnpaidPrincipalBalanceOfThirdPartyServicedLoans
/ us-gaap_FinancialInstrumentAxis
= us-gaap_AutomobileLoanMember 		  837,700,000,000hban_UnpaidPrincipalBalanceOfThirdPartyServicedLoans
/ us-gaap_FinancialInstrumentAxis
= us-gaap_AutomobileLoanMember
Small Business Association (SBA) Loan [Member]            
Loans sales and securitizations (Textuals) [Abstract]            
Servicing income       2,000,000us-gaap_ContractuallySpecifiedServicingFeesLateFeesAndAncillaryFeesEarnedInExchangeForServicingFinancialAssets
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember 		1,700,000us-gaap_ContractuallySpecifiedServicingFeesLateFeesAndAncillaryFeesEarnedInExchangeForServicingFinancialAssets
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember 		 
Unpaid principal balance of third party serviced loans       $ 889,800,000hban_UnpaidPrincipalBalanceOfThirdPartyServicedLoans
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember 		  $ 898,000,000hban_UnpaidPrincipalBalanceOfThirdPartyServicedLoans
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember