Annual report pursuant to Section 13 and 15(d)

Loans sales and securitizations (Details 1)

v2.4.1.9
Loans sales and securitizations (Details 1) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Sensitivity Analysis of Fair Value of Interests Continued to be Held by Transferor, Servicing Assets or Liabilities, Impact of Adverse Change in Assumption [Line Items]        
Constant pre-payment rate, actual 15.60%us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOfOtherThan10Or20PercentAdverseChangeInPrepaymentSpeedPercent      
Constant pre-payment rate, 10% adverse change $ (1,176)us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOf10PercentAdverseChangeInPrepaymentSpeed      
Constant pre-payment rate, 20% adverse change (2,248)us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOf20PercentAdverseChangeInPrepaymentSpeed      
Spread over forward interest rate swap rates, actual 5.46%us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOfOtherThan10Or20PercentAdverseChangeInDiscountRatePercent      
Spread over forward interest rate swap rates, 10% adverse change (699)us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOf10PercentAdverseChangeInDiscountRate      
Spread over forward interest rate swap rates, 20% adverse change (1,355)us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOf20PercentAdverseChangeInDiscountRate      
Fair value method | Residential Mortgage [Member]        
Sensitivity Analysis of Fair Value of Interests Continued to be Held by Transferor, Servicing Assets or Liabilities, Impact of Adverse Change in Assumption [Line Items]        
Constant pre-payment rate, actual   11.90%us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOfOtherThan10Or20PercentAdverseChangeInPrepaymentSpeedPercent
/ us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOfAdverseChangeInAssumptionByTypeOfFinancialInstrumentAxis
= us-gaap_ResidentialMortgageMember
/ hban_SensitivityAnalysisOfFairValueOfServicingRightsAxis
= hban_SensitivityAnalysisFairValueCarryingMethodMember 		   
Constant pre-payment rate, 10% adverse change   (1,935)us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOf10PercentAdverseChangeInPrepaymentSpeed
/ us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOfAdverseChangeInAssumptionByTypeOfFinancialInstrumentAxis
= us-gaap_ResidentialMortgageMember
/ hban_SensitivityAnalysisOfFairValueOfServicingRightsAxis
= hban_SensitivityAnalysisFairValueCarryingMethodMember 		   
Constant pre-payment rate, 20% adverse change   (3,816)us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOf20PercentAdverseChangeInPrepaymentSpeed
/ us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOfAdverseChangeInAssumptionByTypeOfFinancialInstrumentAxis
= us-gaap_ResidentialMortgageMember
/ hban_SensitivityAnalysisOfFairValueOfServicingRightsAxis
= hban_SensitivityAnalysisFairValueCarryingMethodMember 		   
Spread over forward interest rate swap rates, actual   10.69%us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOfOtherThan10Or20PercentAdverseChangeInDiscountRatePercent
/ us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOfAdverseChangeInAssumptionByTypeOfFinancialInstrumentAxis
= us-gaap_ResidentialMortgageMember
/ hban_SensitivityAnalysisOfFairValueOfServicingRightsAxis
= hban_SensitivityAnalysisFairValueCarryingMethodMember 		   
Spread over forward interest rate swap rates, 10% adverse change   (1,376)us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOf10PercentAdverseChangeInDiscountRate
/ us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOfAdverseChangeInAssumptionByTypeOfFinancialInstrumentAxis
= us-gaap_ResidentialMortgageMember
/ hban_SensitivityAnalysisOfFairValueOfServicingRightsAxis
= hban_SensitivityAnalysisFairValueCarryingMethodMember 		   
Spread over forward interest rate swap rates, 20% adverse change   (2,753)us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOf20PercentAdverseChangeInDiscountRate
/ us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOfAdverseChangeInAssumptionByTypeOfFinancialInstrumentAxis
= us-gaap_ResidentialMortgageMember
/ hban_SensitivityAnalysisOfFairValueOfServicingRightsAxis
= hban_SensitivityAnalysisFairValueCarryingMethodMember 		   
Amortization method | Residential Mortgage [Member]        
Sensitivity Analysis of Fair Value of Interests Continued to be Held by Transferor, Servicing Assets or Liabilities, Impact of Adverse Change in Assumption [Line Items]        
Constant pre-payment rate, actual 11.40%us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOfOtherThan10Or20PercentAdverseChangeInPrepaymentSpeedPercent
/ us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOfAdverseChangeInAssumptionByTypeOfFinancialInstrumentAxis
= us-gaap_ResidentialMortgageMember
/ hban_SensitivityAnalysisOfFairValueOfServicingRightsAxis
= hban_SensitivityAnalysisAmortizationCarryingMethodMember 		6.70%us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOfOtherThan10Or20PercentAdverseChangeInPrepaymentSpeedPercent
/ us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOfAdverseChangeInAssumptionByTypeOfFinancialInstrumentAxis
= us-gaap_ResidentialMortgageMember
/ hban_SensitivityAnalysisOfFairValueOfServicingRightsAxis
= hban_SensitivityAnalysisAmortizationCarryingMethodMember 		   
Constant pre-payment rate, 10% adverse change (5,289)us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOf10PercentAdverseChangeInPrepaymentSpeed
/ us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOfAdverseChangeInAssumptionByTypeOfFinancialInstrumentAxis
= us-gaap_ResidentialMortgageMember
/ hban_SensitivityAnalysisOfFairValueOfServicingRightsAxis
= hban_SensitivityAnalysisAmortizationCarryingMethodMember 		(6,813)us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOf10PercentAdverseChangeInPrepaymentSpeed
/ us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOfAdverseChangeInAssumptionByTypeOfFinancialInstrumentAxis
= us-gaap_ResidentialMortgageMember
/ hban_SensitivityAnalysisOfFairValueOfServicingRightsAxis
= hban_SensitivityAnalysisAmortizationCarryingMethodMember 		   
Constant pre-payment rate, 20% adverse change (10,164)us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOf20PercentAdverseChangeInPrepaymentSpeed
/ us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOfAdverseChangeInAssumptionByTypeOfFinancialInstrumentAxis
= us-gaap_ResidentialMortgageMember
/ hban_SensitivityAnalysisOfFairValueOfServicingRightsAxis
= hban_SensitivityAnalysisAmortizationCarryingMethodMember 		(12,977)us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOf20PercentAdverseChangeInPrepaymentSpeed
/ us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOfAdverseChangeInAssumptionByTypeOfFinancialInstrumentAxis
= us-gaap_ResidentialMortgageMember
/ hban_SensitivityAnalysisOfFairValueOfServicingRightsAxis
= hban_SensitivityAnalysisAmortizationCarryingMethodMember 		   
Spread over forward interest rate swap rates, actual 8.56%us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOfOtherThan10Or20PercentAdverseChangeInDiscountRatePercent
/ us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOfAdverseChangeInAssumptionByTypeOfFinancialInstrumentAxis
= us-gaap_ResidentialMortgageMember
/ hban_SensitivityAnalysisOfFairValueOfServicingRightsAxis
= hban_SensitivityAnalysisAmortizationCarryingMethodMember 		9.40%us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOfOtherThan10Or20PercentAdverseChangeInDiscountRatePercent
/ us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOfAdverseChangeInAssumptionByTypeOfFinancialInstrumentAxis
= us-gaap_ResidentialMortgageMember
/ hban_SensitivityAnalysisOfFairValueOfServicingRightsAxis
= hban_SensitivityAnalysisAmortizationCarryingMethodMember 		   
Spread over forward interest rate swap rates, 10% adverse change (4,343)us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOf10PercentAdverseChangeInDiscountRate
/ us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOfAdverseChangeInAssumptionByTypeOfFinancialInstrumentAxis
= us-gaap_ResidentialMortgageMember
/ hban_SensitivityAnalysisOfFairValueOfServicingRightsAxis
= hban_SensitivityAnalysisAmortizationCarryingMethodMember 		(6,027)us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOf10PercentAdverseChangeInDiscountRate
/ us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOfAdverseChangeInAssumptionByTypeOfFinancialInstrumentAxis
= us-gaap_ResidentialMortgageMember
/ hban_SensitivityAnalysisOfFairValueOfServicingRightsAxis
= hban_SensitivityAnalysisAmortizationCarryingMethodMember 		   
Spread over forward interest rate swap rates, 20% adverse change (8,403)us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOf20PercentAdverseChangeInDiscountRate
/ us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOfAdverseChangeInAssumptionByTypeOfFinancialInstrumentAxis
= us-gaap_ResidentialMortgageMember
/ hban_SensitivityAnalysisOfFairValueOfServicingRightsAxis
= hban_SensitivityAnalysisAmortizationCarryingMethodMember 		(12,054)us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOf20PercentAdverseChangeInDiscountRate
/ us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOfAdverseChangeInAssumptionByTypeOfFinancialInstrumentAxis
= us-gaap_ResidentialMortgageMember
/ hban_SensitivityAnalysisOfFairValueOfServicingRightsAxis
= hban_SensitivityAnalysisAmortizationCarryingMethodMember 		   
Amortization method | Automobile Loan [Member]        
Sensitivity Analysis of Fair Value of Interests Continued to be Held by Transferor, Servicing Assets or Liabilities, Impact of Adverse Change in Assumption [Line Items]        
Constant pre-payment rate, actual 14.62%us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOfOtherThan10Or20PercentAdverseChangeInPrepaymentSpeedPercent
/ us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOfAdverseChangeInAssumptionByTypeOfFinancialInstrumentAxis
= us-gaap_AutomobileLoanMember
/ hban_SensitivityAnalysisOfFairValueOfServicingRightsAxis
= hban_SensitivityAnalysisAmortizationCarryingMethodMember 		14.65%us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOfOtherThan10Or20PercentAdverseChangeInPrepaymentSpeedPercent
/ us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOfAdverseChangeInAssumptionByTypeOfFinancialInstrumentAxis
= us-gaap_AutomobileLoanMember
/ hban_SensitivityAnalysisOfFairValueOfServicingRightsAxis
= hban_SensitivityAnalysisAmortizationCarryingMethodMember 		   
Constant pre-payment rate, 10% adverse change (305)us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOf10PercentAdverseChangeInPrepaymentSpeed
/ us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOfAdverseChangeInAssumptionByTypeOfFinancialInstrumentAxis
= us-gaap_AutomobileLoanMember
/ hban_SensitivityAnalysisOfFairValueOfServicingRightsAxis
= hban_SensitivityAnalysisAmortizationCarryingMethodMember 		(584)us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOf10PercentAdverseChangeInPrepaymentSpeed
/ us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOfAdverseChangeInAssumptionByTypeOfFinancialInstrumentAxis
= us-gaap_AutomobileLoanMember
/ hban_SensitivityAnalysisOfFairValueOfServicingRightsAxis
= hban_SensitivityAnalysisAmortizationCarryingMethodMember 		   
Constant pre-payment rate, 20% adverse change (496)us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOf20PercentAdverseChangeInPrepaymentSpeed
/ us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOfAdverseChangeInAssumptionByTypeOfFinancialInstrumentAxis
= us-gaap_AutomobileLoanMember
/ hban_SensitivityAnalysisOfFairValueOfServicingRightsAxis
= hban_SensitivityAnalysisAmortizationCarryingMethodMember 		(1,183)us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOf20PercentAdverseChangeInPrepaymentSpeed
/ us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOfAdverseChangeInAssumptionByTypeOfFinancialInstrumentAxis
= us-gaap_AutomobileLoanMember
/ hban_SensitivityAnalysisOfFairValueOfServicingRightsAxis
= hban_SensitivityAnalysisAmortizationCarryingMethodMember 		   
Spread over forward interest rate swap rates, actual 5.00%us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOfOtherThan10Or20PercentAdverseChangeInDiscountRatePercent
/ us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOfAdverseChangeInAssumptionByTypeOfFinancialInstrumentAxis
= us-gaap_AutomobileLoanMember
/ hban_SensitivityAnalysisOfFairValueOfServicingRightsAxis
= hban_SensitivityAnalysisAmortizationCarryingMethodMember 		500.00%us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOfOtherThan10Or20PercentAdverseChangeInDiscountRatePercent
/ us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOfAdverseChangeInAssumptionByTypeOfFinancialInstrumentAxis
= us-gaap_AutomobileLoanMember
/ hban_SensitivityAnalysisOfFairValueOfServicingRightsAxis
= hban_SensitivityAnalysisAmortizationCarryingMethodMember 		   
Spread over forward interest rate swap rates, 10% adverse change (2)us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOf10PercentAdverseChangeInDiscountRate
/ us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOfAdverseChangeInAssumptionByTypeOfFinancialInstrumentAxis
= us-gaap_AutomobileLoanMember
/ hban_SensitivityAnalysisOfFairValueOfServicingRightsAxis
= hban_SensitivityAnalysisAmortizationCarryingMethodMember 		(7)us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOf10PercentAdverseChangeInDiscountRate
/ us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOfAdverseChangeInAssumptionByTypeOfFinancialInstrumentAxis
= us-gaap_AutomobileLoanMember
/ hban_SensitivityAnalysisOfFairValueOfServicingRightsAxis
= hban_SensitivityAnalysisAmortizationCarryingMethodMember 		   
Spread over forward interest rate swap rates, 20% adverse change (4)us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOf20PercentAdverseChangeInDiscountRate
/ us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOfAdverseChangeInAssumptionByTypeOfFinancialInstrumentAxis
= us-gaap_AutomobileLoanMember
/ hban_SensitivityAnalysisOfFairValueOfServicingRightsAxis
= hban_SensitivityAnalysisAmortizationCarryingMethodMember 		(15)us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOf20PercentAdverseChangeInDiscountRate
/ us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOfAdverseChangeInAssumptionByTypeOfFinancialInstrumentAxis
= us-gaap_AutomobileLoanMember
/ hban_SensitivityAnalysisOfFairValueOfServicingRightsAxis
= hban_SensitivityAnalysisAmortizationCarryingMethodMember 		   
Amortization method | Small Business Association (SBA) Loan [Member]        
Sensitivity Analysis of Fair Value of Interests Continued to be Held by Transferor, Servicing Assets or Liabilities, Impact of Adverse Change in Assumption [Line Items]        
Constant pre-payment rate, actual 5.60%us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOfOtherThan10Or20PercentAdverseChangeInPrepaymentSpeedPercent
/ us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOfAdverseChangeInAssumptionByTypeOfFinancialInstrumentAxis
= us-gaap_CommercialLoanMember
/ hban_SensitivityAnalysisOfFairValueOfServicingRightsAxis
= hban_SensitivityAnalysisAmortizationCarryingMethodMember 		5.90%us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOfOtherThan10Or20PercentAdverseChangeInPrepaymentSpeedPercent
/ us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOfAdverseChangeInAssumptionByTypeOfFinancialInstrumentAxis
= us-gaap_CommercialLoanMember
/ hban_SensitivityAnalysisOfFairValueOfServicingRightsAxis
= hban_SensitivityAnalysisAmortizationCarryingMethodMember 		   
Constant pre-payment rate, 10% adverse change (211)us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOf10PercentAdverseChangeInPrepaymentSpeed
/ us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOfAdverseChangeInAssumptionByTypeOfFinancialInstrumentAxis
= us-gaap_CommercialLoanMember
/ hban_SensitivityAnalysisOfFairValueOfServicingRightsAxis
= hban_SensitivityAnalysisAmortizationCarryingMethodMember 		(221)us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOf10PercentAdverseChangeInPrepaymentSpeed
/ us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOfAdverseChangeInAssumptionByTypeOfFinancialInstrumentAxis
= us-gaap_CommercialLoanMember
/ hban_SensitivityAnalysisOfFairValueOfServicingRightsAxis
= hban_SensitivityAnalysisAmortizationCarryingMethodMember 		   
Constant pre-payment rate, 20% adverse change (419)us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOf20PercentAdverseChangeInPrepaymentSpeed
/ us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOfAdverseChangeInAssumptionByTypeOfFinancialInstrumentAxis
= us-gaap_CommercialLoanMember
/ hban_SensitivityAnalysisOfFairValueOfServicingRightsAxis
= hban_SensitivityAnalysisAmortizationCarryingMethodMember 		(438)us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOf20PercentAdverseChangeInPrepaymentSpeed
/ us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOfAdverseChangeInAssumptionByTypeOfFinancialInstrumentAxis
= us-gaap_CommercialLoanMember
/ hban_SensitivityAnalysisOfFairValueOfServicingRightsAxis
= hban_SensitivityAnalysisAmortizationCarryingMethodMember 		   
Spread over forward interest rate swap rates, actual 15.00%us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOfOtherThan10Or20PercentAdverseChangeInDiscountRatePercent
/ us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOfAdverseChangeInAssumptionByTypeOfFinancialInstrumentAxis
= us-gaap_CommercialLoanMember
/ hban_SensitivityAnalysisOfFairValueOfServicingRightsAxis
= hban_SensitivityAnalysisAmortizationCarryingMethodMember 		1500.00%us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOfOtherThan10Or20PercentAdverseChangeInDiscountRatePercent
/ us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOfAdverseChangeInAssumptionByTypeOfFinancialInstrumentAxis
= us-gaap_CommercialLoanMember
/ hban_SensitivityAnalysisOfFairValueOfServicingRightsAxis
= hban_SensitivityAnalysisAmortizationCarryingMethodMember 		   
Spread over forward interest rate swap rates, 10% adverse change (563)us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOf10PercentAdverseChangeInDiscountRate
/ us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOfAdverseChangeInAssumptionByTypeOfFinancialInstrumentAxis
= us-gaap_CommercialLoanMember
/ hban_SensitivityAnalysisOfFairValueOfServicingRightsAxis
= hban_SensitivityAnalysisAmortizationCarryingMethodMember 		(446)us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOf10PercentAdverseChangeInDiscountRate
/ us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOfAdverseChangeInAssumptionByTypeOfFinancialInstrumentAxis
= us-gaap_CommercialLoanMember
/ hban_SensitivityAnalysisOfFairValueOfServicingRightsAxis
= hban_SensitivityAnalysisAmortizationCarryingMethodMember 		   
Spread over forward interest rate swap rates, 20% adverse change (1,102)us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOf20PercentAdverseChangeInDiscountRate
/ us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOfAdverseChangeInAssumptionByTypeOfFinancialInstrumentAxis
= us-gaap_CommercialLoanMember
/ hban_SensitivityAnalysisOfFairValueOfServicingRightsAxis
= hban_SensitivityAnalysisAmortizationCarryingMethodMember 		(873)us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOf20PercentAdverseChangeInDiscountRate
/ us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOfAdverseChangeInAssumptionByTypeOfFinancialInstrumentAxis
= us-gaap_CommercialLoanMember
/ hban_SensitivityAnalysisOfFairValueOfServicingRightsAxis
= hban_SensitivityAnalysisAmortizationCarryingMethodMember 		   
Residential Mortgage [Member]        
Summarizes activity relating to loans sold securitized with servicing retained        
Loans sold with servicing retained 2,330,060hban_LoansWithServicingRetainedSold
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ResidentialMortgageMember 		3,221,239hban_LoansWithServicingRetainedSold
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ResidentialMortgageMember 		3,954,762hban_LoansWithServicingRetainedSold
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ResidentialMortgageMember 		 
Summarize the changes in servicing rights using the amortization method        
Carrying value, beginning of year 128,064us-gaap_ServicingAssetAtAmortizedValue
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ResidentialMortgageMember 		  85,545us-gaap_ServicingAssetAtAmortizedValue
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ResidentialMortgageMember 		 
New servicing assets created 24,629us-gaap_ServicingAssetAtAmortizedValueAdditions
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ResidentialMortgageMember 		34,743us-gaap_ServicingAssetAtAmortizedValueAdditions
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ResidentialMortgageMember 		   
Impairment charge/(recovery) (7,330)hban_ServicingImpairmentCharge
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ResidentialMortgageMember 		22,023hban_ServicingImpairmentCharge
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ResidentialMortgageMember 		   
Amortization and other (16,056)us-gaap_ServicingAssetAtAmortizedValueAmortization1
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ResidentialMortgageMember 		(14,247)us-gaap_ServicingAssetAtAmortizedValueAmortization1
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ResidentialMortgageMember 		   
Carrying value, end of period 132,812us-gaap_ServicingAssetAtAmortizedValue
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ResidentialMortgageMember 		128,064us-gaap_ServicingAssetAtAmortizedValue
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ResidentialMortgageMember 		   
Fair value, end of period 133,049us-gaap_ServicingAssetAtAmortizedValueFairValue
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ResidentialMortgageMember 		143,304us-gaap_ServicingAssetAtAmortizedValueFairValue
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ResidentialMortgageMember 		   
Residential Mortgage [Member] | Fair value method        
Summarize the changes in servicing rights using the amortization method        
Weighted-average life (in years) 4 years 3 months 0 days 4 years 2 months 0 days    
Residential Mortgage [Member] | Amortization method        
Summarize the changes in servicing rights using the amortization method        
Weighted-average life (in years) 6 years 9 months 0 days 6 years 10 months 0 days    
Automobile Loan [Member]        
Summarizes activity relating to loans sold securitized with servicing retained        
Loans sold with servicing retained 0hban_LoansWithServicingRetainedSold
/ us-gaap_FinancialInstrumentAxis
= us-gaap_AutomobileLoanMember 		0hban_LoansWithServicingRetainedSold
/ us-gaap_FinancialInstrumentAxis
= us-gaap_AutomobileLoanMember 		169,324hban_LoansWithServicingRetainedSold
/ 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 		  2,300,018us-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 		42,251us-gaap_SecuritizationFinancialAssetForWhichTransferIsAccountedAsSaleGainLossOnSale
/ us-gaap_FinancialInstrumentAxis
= us-gaap_AutomobileLoanMember 		 
Summarize the changes in servicing rights using the amortization method        
Carrying value, beginning of year 17,672us-gaap_ServicingAssetAtAmortizedValue
/ us-gaap_FinancialInstrumentAxis
= us-gaap_AutomobileLoanMember 		  35,606us-gaap_ServicingAssetAtAmortizedValue
/ us-gaap_FinancialInstrumentAxis
= us-gaap_AutomobileLoanMember 		 
New servicing assets created 0us-gaap_ServicingAssetAtAmortizedValueAdditions
/ us-gaap_FinancialInstrumentAxis
= us-gaap_AutomobileLoanMember 		0us-gaap_ServicingAssetAtAmortizedValueAdditions
/ us-gaap_FinancialInstrumentAxis
= us-gaap_AutomobileLoanMember 		   
Impairment charge/(recovery) 0hban_ServicingImpairmentCharge
/ us-gaap_FinancialInstrumentAxis
= us-gaap_AutomobileLoanMember 		0hban_ServicingImpairmentCharge
/ us-gaap_FinancialInstrumentAxis
= us-gaap_AutomobileLoanMember 		   
Amortization and other (10,774)us-gaap_ServicingAssetAtAmortizedValueAmortization1
/ us-gaap_FinancialInstrumentAxis
= us-gaap_AutomobileLoanMember 		(17,934)us-gaap_ServicingAssetAtAmortizedValueAmortization1
/ us-gaap_FinancialInstrumentAxis
= us-gaap_AutomobileLoanMember 		   
Carrying value, end of period 6,898us-gaap_ServicingAssetAtAmortizedValue
/ us-gaap_FinancialInstrumentAxis
= us-gaap_AutomobileLoanMember 		17,672us-gaap_ServicingAssetAtAmortizedValue
/ us-gaap_FinancialInstrumentAxis
= us-gaap_AutomobileLoanMember 		   
Fair value, end of period 6,948us-gaap_ServicingAssetAtAmortizedValueFairValue
/ us-gaap_FinancialInstrumentAxis
= us-gaap_AutomobileLoanMember 		18,193us-gaap_ServicingAssetAtAmortizedValueFairValue
/ us-gaap_FinancialInstrumentAxis
= us-gaap_AutomobileLoanMember 		   
Automobile Loan [Member] | Amortization method        
Summarize the changes in servicing rights using the amortization method        
Weighted-average life (in years) 3 years 7 months 0 days 3 years 7 months 0 days    
Small Business Association (SBA) Loan [Member]        
Summarizes activity relating to loans sold securitized with servicing retained        
Loans sold with servicing retained 214,760hban_LoansWithServicingRetainedSold
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember 		178,874hban_LoansWithServicingRetainedSold
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember 		209,540hban_LoansWithServicingRetainedSold
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember 		 
Gain Loss On Sale Of Loans 24,579us-gaap_GainLossOnSaleOfLoansAndLeases
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember 		[1] 19,556us-gaap_GainLossOnSaleOfLoansAndLeases
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember 		[1] 22,916us-gaap_GainLossOnSaleOfLoansAndLeases
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember 		[1]  
Summarize the changes in servicing rights using the amortization method        
Carrying value, beginning of year 16,865us-gaap_ServicingAssetAtAmortizedValue
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember 		  15,147us-gaap_ServicingAssetAtAmortizedValue
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember 		 
New servicing assets created 7,269us-gaap_ServicingAssetAtAmortizedValueAdditions
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember 		6,105us-gaap_ServicingAssetAtAmortizedValueAdditions
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember 		   
Impairment charge/(recovery) 0hban_ServicingImpairmentCharge
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember 		0hban_ServicingImpairmentCharge
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember 		   
Amortization and other (5,598)us-gaap_ServicingAssetAtAmortizedValueAmortization1
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember 		(4,387)us-gaap_ServicingAssetAtAmortizedValueAmortization1
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember 		   
Carrying value, end of period 18,536us-gaap_ServicingAssetAtAmortizedValue
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember 		16,865us-gaap_ServicingAssetAtAmortizedValue
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember 		   
Fair value, end of period $ 20,495us-gaap_ServicingAssetAtAmortizedValueFairValue
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember 		$ 16,865us-gaap_ServicingAssetAtAmortizedValueFairValue
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember 		   
Small Business Association (SBA) Loan [Member] | Amortization method        
Summarize the changes in servicing rights using the amortization method        
Weighted-average life (in years) 3 years 6 months 0 days 3 years 6 months 0 days    
[1]
Recorded in noninterest income