Quarterly report pursuant to Section 13 or 15(d)

Loans sales and securitizations (Details 1)

v2.4.1.9
Loans sales and securitizations (Details 1) (USD $)
3 Months Ended 12 Months Ended 3 Months Ended
Mar. 31, 2015
Dec. 31, 2014
Mar. 31, 2014
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 15.20%us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOfOtherThan10Or20PercentAdverseChangeInPrepaymentSpeedPercent
/ us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOfAdverseChangeInAssumptionByTypeOfFinancialInstrumentAxis
= us-gaap_ResidentialMortgageMember
/ hban_SensitivityAnalysisOfFairValueOfServicingRightsAxis
= hban_SensitivityAnalysisFairValueCarryingMethodMember
15.60%us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOfOtherThan10Or20PercentAdverseChangeInPrepaymentSpeedPercent
/ us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOfAdverseChangeInAssumptionByTypeOfFinancialInstrumentAxis
= us-gaap_ResidentialMortgageMember
/ hban_SensitivityAnalysisOfFairValueOfServicingRightsAxis
= hban_SensitivityAnalysisFairValueCarryingMethodMember
 
Constant pre-payment rate, 10% adverse change $ 1,046,000us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOf10PercentAdverseChangeInPrepaymentSpeed
/ us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOfAdverseChangeInAssumptionByTypeOfFinancialInstrumentAxis
= us-gaap_ResidentialMortgageMember
/ hban_SensitivityAnalysisOfFairValueOfServicingRightsAxis
= hban_SensitivityAnalysisFairValueCarryingMethodMember
$ 1,176,000us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOf10PercentAdverseChangeInPrepaymentSpeed
/ us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOfAdverseChangeInAssumptionByTypeOfFinancialInstrumentAxis
= us-gaap_ResidentialMortgageMember
/ hban_SensitivityAnalysisOfFairValueOfServicingRightsAxis
= hban_SensitivityAnalysisFairValueCarryingMethodMember
 
Constant pre-payment rate, 20% adverse change 2,002,000us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOf20PercentAdverseChangeInPrepaymentSpeed
/ us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOfAdverseChangeInAssumptionByTypeOfFinancialInstrumentAxis
= us-gaap_ResidentialMortgageMember
/ hban_SensitivityAnalysisOfFairValueOfServicingRightsAxis
= hban_SensitivityAnalysisFairValueCarryingMethodMember
2,248,000us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOf20PercentAdverseChangeInPrepaymentSpeed
/ us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOfAdverseChangeInAssumptionByTypeOfFinancialInstrumentAxis
= us-gaap_ResidentialMortgageMember
/ hban_SensitivityAnalysisOfFairValueOfServicingRightsAxis
= hban_SensitivityAnalysisFairValueCarryingMethodMember
 
Spread over forward interest rate swap rates, actual 6.41%us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOfOtherThan10Or20PercentAdverseChangeInDiscountRatePercent
/ us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOfAdverseChangeInAssumptionByTypeOfFinancialInstrumentAxis
= us-gaap_ResidentialMortgageMember
/ hban_SensitivityAnalysisOfFairValueOfServicingRightsAxis
= hban_SensitivityAnalysisFairValueCarryingMethodMember
5.46%us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOfOtherThan10Or20PercentAdverseChangeInDiscountRatePercent
/ us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOfAdverseChangeInAssumptionByTypeOfFinancialInstrumentAxis
= us-gaap_ResidentialMortgageMember
/ hban_SensitivityAnalysisOfFairValueOfServicingRightsAxis
= hban_SensitivityAnalysisFairValueCarryingMethodMember
 
Spread over forward interest rate swap rates, 10% adverse change 625,000us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOf10PercentAdverseChangeInDiscountRate
/ us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOfAdverseChangeInAssumptionByTypeOfFinancialInstrumentAxis
= us-gaap_ResidentialMortgageMember
/ hban_SensitivityAnalysisOfFairValueOfServicingRightsAxis
= hban_SensitivityAnalysisFairValueCarryingMethodMember
699,000us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOf10PercentAdverseChangeInDiscountRate
/ us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOfAdverseChangeInAssumptionByTypeOfFinancialInstrumentAxis
= us-gaap_ResidentialMortgageMember
/ hban_SensitivityAnalysisOfFairValueOfServicingRightsAxis
= hban_SensitivityAnalysisFairValueCarryingMethodMember
 
Spread over forward interest rate swap rates, 20% adverse change 1,214,000us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOf20PercentAdverseChangeInDiscountRate
/ us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOfAdverseChangeInAssumptionByTypeOfFinancialInstrumentAxis
= us-gaap_ResidentialMortgageMember
/ hban_SensitivityAnalysisOfFairValueOfServicingRightsAxis
= hban_SensitivityAnalysisFairValueCarryingMethodMember
1,355,000us-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 11.90%us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOfOtherThan10Or20PercentAdverseChangeInPrepaymentSpeedPercent
/ us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOfAdverseChangeInAssumptionByTypeOfFinancialInstrumentAxis
= us-gaap_ResidentialMortgageMember
/ hban_SensitivityAnalysisOfFairValueOfServicingRightsAxis
= hban_SensitivityAnalysisAmortizationCarryingMethodMember
11.40%us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOfOtherThan10Or20PercentAdverseChangeInPrepaymentSpeedPercent
/ us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOfAdverseChangeInAssumptionByTypeOfFinancialInstrumentAxis
= us-gaap_ResidentialMortgageMember
/ hban_SensitivityAnalysisOfFairValueOfServicingRightsAxis
= hban_SensitivityAnalysisAmortizationCarryingMethodMember
 
Constant pre-payment rate, 10% adverse change 5,135,000us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOf10PercentAdverseChangeInPrepaymentSpeed
/ us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOfAdverseChangeInAssumptionByTypeOfFinancialInstrumentAxis
= us-gaap_ResidentialMortgageMember
/ hban_SensitivityAnalysisOfFairValueOfServicingRightsAxis
= hban_SensitivityAnalysisAmortizationCarryingMethodMember
5,289,000us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOf10PercentAdverseChangeInPrepaymentSpeed
/ us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOfAdverseChangeInAssumptionByTypeOfFinancialInstrumentAxis
= us-gaap_ResidentialMortgageMember
/ hban_SensitivityAnalysisOfFairValueOfServicingRightsAxis
= hban_SensitivityAnalysisAmortizationCarryingMethodMember
 
Constant pre-payment rate, 20% adverse change 9,860,000us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOf20PercentAdverseChangeInPrepaymentSpeed
/ us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOfAdverseChangeInAssumptionByTypeOfFinancialInstrumentAxis
= us-gaap_ResidentialMortgageMember
/ hban_SensitivityAnalysisOfFairValueOfServicingRightsAxis
= hban_SensitivityAnalysisAmortizationCarryingMethodMember
10,164,000us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOf20PercentAdverseChangeInPrepaymentSpeed
/ us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOfAdverseChangeInAssumptionByTypeOfFinancialInstrumentAxis
= us-gaap_ResidentialMortgageMember
/ hban_SensitivityAnalysisOfFairValueOfServicingRightsAxis
= hban_SensitivityAnalysisAmortizationCarryingMethodMember
 
Spread over forward interest rate swap rates, actual 9.28%us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOfOtherThan10Or20PercentAdverseChangeInDiscountRatePercent
/ us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOfAdverseChangeInAssumptionByTypeOfFinancialInstrumentAxis
= us-gaap_ResidentialMortgageMember
/ hban_SensitivityAnalysisOfFairValueOfServicingRightsAxis
= hban_SensitivityAnalysisAmortizationCarryingMethodMember
8.56%us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOfOtherThan10Or20PercentAdverseChangeInDiscountRatePercent
/ us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOfAdverseChangeInAssumptionByTypeOfFinancialInstrumentAxis
= us-gaap_ResidentialMortgageMember
/ hban_SensitivityAnalysisOfFairValueOfServicingRightsAxis
= hban_SensitivityAnalysisAmortizationCarryingMethodMember
 
Spread over forward interest rate swap rates, 10% adverse change 3,957,000us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOf10PercentAdverseChangeInDiscountRate
/ us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOfAdverseChangeInAssumptionByTypeOfFinancialInstrumentAxis
= us-gaap_ResidentialMortgageMember
/ hban_SensitivityAnalysisOfFairValueOfServicingRightsAxis
= hban_SensitivityAnalysisAmortizationCarryingMethodMember
4,343,000us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOf10PercentAdverseChangeInDiscountRate
/ us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOfAdverseChangeInAssumptionByTypeOfFinancialInstrumentAxis
= us-gaap_ResidentialMortgageMember
/ hban_SensitivityAnalysisOfFairValueOfServicingRightsAxis
= hban_SensitivityAnalysisAmortizationCarryingMethodMember
 
Spread over forward interest rate swap rates, 20% adverse change 7,663,000us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOf20PercentAdverseChangeInDiscountRate
/ us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOfAdverseChangeInAssumptionByTypeOfFinancialInstrumentAxis
= us-gaap_ResidentialMortgageMember
/ hban_SensitivityAnalysisOfFairValueOfServicingRightsAxis
= hban_SensitivityAnalysisAmortizationCarryingMethodMember
8,403,000us-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 15.60%us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOfOtherThan10Or20PercentAdverseChangeInPrepaymentSpeedPercent
/ us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOfAdverseChangeInAssumptionByTypeOfFinancialInstrumentAxis
= us-gaap_AutomobileLoanMember
/ hban_SensitivityAnalysisOfFairValueOfServicingRightsAxis
= hban_SensitivityAnalysisAmortizationCarryingMethodMember
14.62%us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOfOtherThan10Or20PercentAdverseChangeInPrepaymentSpeedPercent
/ us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOfAdverseChangeInAssumptionByTypeOfFinancialInstrumentAxis
= us-gaap_AutomobileLoanMember
/ hban_SensitivityAnalysisOfFairValueOfServicingRightsAxis
= hban_SensitivityAnalysisAmortizationCarryingMethodMember
 
Constant pre-payment rate, 10% adverse change 98,000us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOf10PercentAdverseChangeInPrepaymentSpeed
/ us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOfAdverseChangeInAssumptionByTypeOfFinancialInstrumentAxis
= us-gaap_AutomobileLoanMember
/ hban_SensitivityAnalysisOfFairValueOfServicingRightsAxis
= hban_SensitivityAnalysisAmortizationCarryingMethodMember
305,000us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOf10PercentAdverseChangeInPrepaymentSpeed
/ us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOfAdverseChangeInAssumptionByTypeOfFinancialInstrumentAxis
= us-gaap_AutomobileLoanMember
/ hban_SensitivityAnalysisOfFairValueOfServicingRightsAxis
= hban_SensitivityAnalysisAmortizationCarryingMethodMember
 
Constant pre-payment rate, 20% adverse change 287,000us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOf20PercentAdverseChangeInPrepaymentSpeed
/ us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOfAdverseChangeInAssumptionByTypeOfFinancialInstrumentAxis
= us-gaap_AutomobileLoanMember
/ hban_SensitivityAnalysisOfFairValueOfServicingRightsAxis
= hban_SensitivityAnalysisAmortizationCarryingMethodMember
496,000us-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
5.00%us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOfOtherThan10Or20PercentAdverseChangeInDiscountRatePercent
/ us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOfAdverseChangeInAssumptionByTypeOfFinancialInstrumentAxis
= us-gaap_AutomobileLoanMember
/ hban_SensitivityAnalysisOfFairValueOfServicingRightsAxis
= hban_SensitivityAnalysisAmortizationCarryingMethodMember
 
Spread over forward interest rate swap rates, 10% adverse change 1,000us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOf10PercentAdverseChangeInDiscountRate
/ us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOfAdverseChangeInAssumptionByTypeOfFinancialInstrumentAxis
= us-gaap_AutomobileLoanMember
/ hban_SensitivityAnalysisOfFairValueOfServicingRightsAxis
= hban_SensitivityAnalysisAmortizationCarryingMethodMember
2,000us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOf10PercentAdverseChangeInDiscountRate
/ us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOfAdverseChangeInAssumptionByTypeOfFinancialInstrumentAxis
= us-gaap_AutomobileLoanMember
/ hban_SensitivityAnalysisOfFairValueOfServicingRightsAxis
= hban_SensitivityAnalysisAmortizationCarryingMethodMember
 
Spread over forward interest rate swap rates, 20% adverse change 3,000us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOf20PercentAdverseChangeInDiscountRate
/ us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOfAdverseChangeInAssumptionByTypeOfFinancialInstrumentAxis
= us-gaap_AutomobileLoanMember
/ hban_SensitivityAnalysisOfFairValueOfServicingRightsAxis
= hban_SensitivityAnalysisAmortizationCarryingMethodMember
4,000us-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 7.80%us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOfOtherThan10Or20PercentAdverseChangeInPrepaymentSpeedPercent
/ us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOfAdverseChangeInAssumptionByTypeOfFinancialInstrumentAxis
= us-gaap_CommercialLoanMember
/ hban_SensitivityAnalysisOfFairValueOfServicingRightsAxis
= hban_SensitivityAnalysisAmortizationCarryingMethodMember
5.60%us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOfOtherThan10Or20PercentAdverseChangeInPrepaymentSpeedPercent
/ us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOfAdverseChangeInAssumptionByTypeOfFinancialInstrumentAxis
= us-gaap_CommercialLoanMember
/ hban_SensitivityAnalysisOfFairValueOfServicingRightsAxis
= hban_SensitivityAnalysisAmortizationCarryingMethodMember
 
Constant pre-payment rate, 10% adverse change 281,000us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOf10PercentAdverseChangeInPrepaymentSpeed
/ us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOfAdverseChangeInAssumptionByTypeOfFinancialInstrumentAxis
= us-gaap_CommercialLoanMember
/ hban_SensitivityAnalysisOfFairValueOfServicingRightsAxis
= hban_SensitivityAnalysisAmortizationCarryingMethodMember
211,000us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOf10PercentAdverseChangeInPrepaymentSpeed
/ us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOfAdverseChangeInAssumptionByTypeOfFinancialInstrumentAxis
= us-gaap_CommercialLoanMember
/ hban_SensitivityAnalysisOfFairValueOfServicingRightsAxis
= hban_SensitivityAnalysisAmortizationCarryingMethodMember
 
Constant pre-payment rate, 20% adverse change 558,000us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOf20PercentAdverseChangeInPrepaymentSpeed
/ us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOfAdverseChangeInAssumptionByTypeOfFinancialInstrumentAxis
= us-gaap_CommercialLoanMember
/ hban_SensitivityAnalysisOfFairValueOfServicingRightsAxis
= hban_SensitivityAnalysisAmortizationCarryingMethodMember
419,000us-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
15.00%us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOfOtherThan10Or20PercentAdverseChangeInDiscountRatePercent
/ us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOfAdverseChangeInAssumptionByTypeOfFinancialInstrumentAxis
= us-gaap_CommercialLoanMember
/ hban_SensitivityAnalysisOfFairValueOfServicingRightsAxis
= hban_SensitivityAnalysisAmortizationCarryingMethodMember
 
Spread over forward interest rate swap rates, 10% adverse change 521,000us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOf10PercentAdverseChangeInDiscountRate
/ us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOfAdverseChangeInAssumptionByTypeOfFinancialInstrumentAxis
= us-gaap_CommercialLoanMember
/ hban_SensitivityAnalysisOfFairValueOfServicingRightsAxis
= hban_SensitivityAnalysisAmortizationCarryingMethodMember
563,000us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOf10PercentAdverseChangeInDiscountRate
/ us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOfAdverseChangeInAssumptionByTypeOfFinancialInstrumentAxis
= us-gaap_CommercialLoanMember
/ hban_SensitivityAnalysisOfFairValueOfServicingRightsAxis
= hban_SensitivityAnalysisAmortizationCarryingMethodMember
 
Spread over forward interest rate swap rates, 20% adverse change 1,020,000us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOf20PercentAdverseChangeInDiscountRate
/ us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOfAdverseChangeInAssumptionByTypeOfFinancialInstrumentAxis
= us-gaap_CommercialLoanMember
/ hban_SensitivityAnalysisOfFairValueOfServicingRightsAxis
= hban_SensitivityAnalysisAmortizationCarryingMethodMember
1,102,000us-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 630,683,000hban_LoansWithServicingRetainedSold
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ResidentialMortgageMember
  481,837,000hban_LoansWithServicingRetainedSold
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ResidentialMortgageMember
Summarize the changes in servicing rights using the amortization method      
Carrying value, beginning of year 132,813,000us-gaap_ServicingAssetAtAmortizedValue
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ResidentialMortgageMember
128,064,000us-gaap_ServicingAssetAtAmortizedValue
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ResidentialMortgageMember
128,064,000us-gaap_ServicingAssetAtAmortizedValue
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ResidentialMortgageMember
New servicing assets created 6,454,000us-gaap_ServicingAssetAtAmortizedValueAdditions
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ResidentialMortgageMember
  5,053,000us-gaap_ServicingAssetAtAmortizedValueAdditions
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ResidentialMortgageMember
Servicing assets acquired 0us-gaap_ServicingAssetAtAmortizedValueOtherChangesThatAffectBalanceAmount
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ResidentialMortgageMember
  3,505,000us-gaap_ServicingAssetAtAmortizedValueOtherChangesThatAffectBalanceAmount
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ResidentialMortgageMember
Impairment charge/(recovery) (7,990,000)hban_ServicingImpairmentCharge
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ResidentialMortgageMember
  (629,000)hban_ServicingImpairmentCharge
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ResidentialMortgageMember
Amortization and other (5,823,000)us-gaap_ServicingAssetAtAmortizedValueAmortization1
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ResidentialMortgageMember
  (3,342,000)us-gaap_ServicingAssetAtAmortizedValueAmortization1
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ResidentialMortgageMember
Carrying value, end of period 125,454,000us-gaap_ServicingAssetAtAmortizedValue
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ResidentialMortgageMember
  132,651,000us-gaap_ServicingAssetAtAmortizedValue
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ResidentialMortgageMember
Fair value, end of period 125,691,000us-gaap_ServicingAssetAtAmortizedValueFairValue
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ResidentialMortgageMember
  144,694,000us-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 8 months 0 days   4 years 1 month 0 days
Residential Mortgage [Member] | Amortization method      
Summarize the changes in servicing rights using the amortization method      
Weighted-average life (in years) 5 years 8 months 0 days   6 years 6 months 0 days
Automobile Loan [Member]      
Summarize the changes in servicing rights using the amortization method      
Carrying value, beginning of year 6,898,000us-gaap_ServicingAssetAtAmortizedValue
/ us-gaap_FinancialInstrumentAxis
= us-gaap_AutomobileLoanMember
17,672,000us-gaap_ServicingAssetAtAmortizedValue
/ us-gaap_FinancialInstrumentAxis
= us-gaap_AutomobileLoanMember
17,672,000us-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
Amortization and other (1,835,000)us-gaap_ServicingAssetAtAmortizedValueAmortization1
/ us-gaap_FinancialInstrumentAxis
= us-gaap_AutomobileLoanMember
  (3,315,000)us-gaap_ServicingAssetAtAmortizedValueAmortization1
/ us-gaap_FinancialInstrumentAxis
= us-gaap_AutomobileLoanMember
Carrying value, end of period 5,063,000us-gaap_ServicingAssetAtAmortizedValue
/ us-gaap_FinancialInstrumentAxis
= us-gaap_AutomobileLoanMember
  14,357,000us-gaap_ServicingAssetAtAmortizedValue
/ us-gaap_FinancialInstrumentAxis
= us-gaap_AutomobileLoanMember
Fair value, end of period 5,155,000us-gaap_ServicingAssetAtAmortizedValueFairValue
/ us-gaap_FinancialInstrumentAxis
= us-gaap_AutomobileLoanMember
  14,357,000us-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) 2 years 5 months 0 days   3 years 2 months 0 days
Small Business Association (SBA) Loan [Member]      
Summarizes activity relating to loans sold securitized with servicing retained      
Loans sold with servicing retained 42,401,000hban_LoansWithServicingRetainedSold
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
  40,871,000hban_LoansWithServicingRetainedSold
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
Summarize the changes in servicing rights using the amortization method      
Carrying value, beginning of year 18,536,000us-gaap_ServicingAssetAtAmortizedValue
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
16,865,000us-gaap_ServicingAssetAtAmortizedValue
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
16,865,000us-gaap_ServicingAssetAtAmortizedValue
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
New servicing assets created 1,457,000us-gaap_ServicingAssetAtAmortizedValueAdditions
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
  1,335,000us-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 (2,046,000)us-gaap_ServicingAssetAtAmortizedValueAmortization1
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
  (1,172,000)us-gaap_ServicingAssetAtAmortizedValueAmortization1
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
Carrying value, end of period 17,947,000us-gaap_ServicingAssetAtAmortizedValue
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
  17,028,000us-gaap_ServicingAssetAtAmortizedValue
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
Fair value, end of period $ 19,436,000us-gaap_ServicingAssetAtAmortizedValueFairValue
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
  $ 17,028,000us-gaap_ServicingAssetAtAmortizedValueFairValue
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
Weighted-average life (in years) 3 years 4 months 0 days   3 years 6 months 0 days