Annual report pursuant to Section 13 and 15(d)

Loans and Leases and Allowance for Credit Losses (Details 2)

v2.4.1.9
Loans and Leases and Allowance for Credit Losses (Details 2) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Allowance For Credit Losses Roll Forward [Abstract]          
ALLL balance, beginning of period $ 647,870us-gaap_LoansAndLeasesReceivableAllowance   $ 769,075us-gaap_LoansAndLeasesReceivableAllowance   $ 964,828us-gaap_LoansAndLeasesReceivableAllowance
Recoveries of loans previously charged-off 121,974hban_RecoveriesOfLoansPreviouslyChargedoff 117,650hban_RecoveriesOfLoansPreviouslyChargedoff 112,738hban_RecoveriesOfLoansPreviouslyChargedoff    
Loan charge-offs (246,601)us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs (306,316)us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs (455,200)us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs    
Provision for loan and lease losses 83,082hban_ProvisionForLoanAndLeaseLosse 67,797hban_ProvisionForLoanAndLeaseLosse 155,193hban_ProvisionForLoanAndLeaseLosse    
Allowance for loans sold or transferred to hoans held for sale (1,129)hban_AllowanceForLoansSoldOrTransferredToLoansHeldForSale (336)hban_AllowanceForLoansSoldOrTransferredToLoansHeldForSale (8,484)hban_AllowanceForLoansSoldOrTransferredToLoansHeldForSale    
ALLL balance, end of period 605,196us-gaap_LoansAndLeasesReceivableAllowance 647,870us-gaap_LoansAndLeasesReceivableAllowance     964,828us-gaap_LoansAndLeasesReceivableAllowance
AULC balance, beginning of period 62,899hban_ULCBalanceBeginningOfPeriod   40,651hban_ULCBalanceBeginningOfPeriod   48,456hban_ULCBalanceBeginningOfPeriod
Provision for unfunded loan commitments and letters of credit (2,093)hban_ProvisionForUnfundedLoanCommitmentsAndLettersOfCredit 22,248hban_ProvisionForUnfundedLoanCommitmentsAndLettersOfCredit (7,805)hban_ProvisionForUnfundedLoanCommitmentsAndLettersOfCredit    
AULC Balance, end of period 60,806hban_AulcBalanceEndOfPeriod 62,899hban_AulcBalanceEndOfPeriod   40,651hban_AulcBalanceEndOfPeriod  
ACL balance, end of period 666,002hban_AclBalanceEndOfPeriod 710,769hban_AclBalanceEndOfPeriod   809,726hban_AclBalanceEndOfPeriod  
Loan and lease balances by credit quality indicator          
Total commercial and industrial 19,033,146us-gaap_LoansReceivableCommercialAndIndustrial 17,594,276us-gaap_LoansReceivableCommercialAndIndustrial      
Total commercial real estate 5,197,403us-gaap_LoansReceivableCommercialRealEstate 4,850,094us-gaap_LoansReceivableCommercialRealEstate      
Automobile 8,689,902hban_LoansAndLeasesReceivableAutomobile 6,638,713hban_LoansAndLeasesReceivableAutomobile      
Home equity 8,490,915us-gaap_LoansAndLeasesReceivableConsumerHomeEquity 8,336,318us-gaap_LoansAndLeasesReceivableConsumerHomeEquity      
Residential mortgage 5,830,609us-gaap_LoansAndLeasesReceivableConsumerMortgage 5,321,088us-gaap_LoansAndLeasesReceivableConsumerMortgage      
Other consumer 413,751us-gaap_LoansAndLeasesReceivableConsumerOther 380,011us-gaap_LoansAndLeasesReceivableConsumerOther      
Automobile loans including automobile loans transferred to loans held for sale 8,689,902hban_AutomobileLoansIncludingHFSSecuritization 6,638,713hban_AutomobileLoansIncludingHFSSecuritization      
Pass [Member]          
Loan and lease balances by credit quality indicator          
Total commercial and industrial 17,888,295us-gaap_LoansReceivableCommercialAndIndustrial
/ hban_CreditQualityIndicatorAxis
= us-gaap_PassMember
16,688,106us-gaap_LoansReceivableCommercialAndIndustrial
/ hban_CreditQualityIndicatorAxis
= us-gaap_PassMember
     
Total commercial real estate 4,886,720us-gaap_LoansReceivableCommercialRealEstate
/ hban_CreditQualityIndicatorAxis
= us-gaap_PassMember
4,395,855us-gaap_LoansReceivableCommercialRealEstate
/ hban_CreditQualityIndicatorAxis
= us-gaap_PassMember
     
OLEM [Member]          
Loan and lease balances by credit quality indicator          
Total commercial and industrial 505,044us-gaap_LoansReceivableCommercialAndIndustrial
/ hban_CreditQualityIndicatorAxis
= us-gaap_SpecialMentionMember
343,166us-gaap_LoansReceivableCommercialAndIndustrial
/ hban_CreditQualityIndicatorAxis
= us-gaap_SpecialMentionMember
     
Total commercial real estate 74,234us-gaap_LoansReceivableCommercialRealEstate
/ hban_CreditQualityIndicatorAxis
= us-gaap_SpecialMentionMember
71,403us-gaap_LoansReceivableCommercialRealEstate
/ hban_CreditQualityIndicatorAxis
= us-gaap_SpecialMentionMember
     
Substandard [Member]          
Loan and lease balances by credit quality indicator          
Total commercial and industrial 630,704us-gaap_LoansReceivableCommercialAndIndustrial
/ hban_CreditQualityIndicatorAxis
= us-gaap_SubstandardMember
548,030us-gaap_LoansReceivableCommercialAndIndustrial
/ hban_CreditQualityIndicatorAxis
= us-gaap_SubstandardMember
     
Total commercial real estate 226,071us-gaap_LoansReceivableCommercialRealEstate
/ hban_CreditQualityIndicatorAxis
= us-gaap_SubstandardMember
376,880us-gaap_LoansReceivableCommercialRealEstate
/ hban_CreditQualityIndicatorAxis
= us-gaap_SubstandardMember
     
Doubtful [Member]          
Loan and lease balances by credit quality indicator          
Total commercial and industrial 9,103us-gaap_LoansReceivableCommercialAndIndustrial
/ hban_CreditQualityIndicatorAxis
= us-gaap_DoubtfulMember
14,974us-gaap_LoansReceivableCommercialAndIndustrial
/ hban_CreditQualityIndicatorAxis
= us-gaap_DoubtfulMember
     
Total commercial real estate 10,378us-gaap_LoansReceivableCommercialRealEstate
/ hban_CreditQualityIndicatorAxis
= us-gaap_DoubtfulMember
5,956us-gaap_LoansReceivableCommercialRealEstate
/ hban_CreditQualityIndicatorAxis
= us-gaap_DoubtfulMember
     
750+[Member]          
Loan and lease balances by credit quality indicator          
Home equity 5,087,751us-gaap_LoansAndLeasesReceivableConsumerHomeEquity
/ hban_CreditQualityIndicatorAxis
= hban_CreditRiskProfileByFicoScoreOneMember
       
Residential mortgage 3,285,904us-gaap_LoansAndLeasesReceivableConsumerMortgage
/ hban_CreditQualityIndicatorAxis
= hban_CreditRiskProfileByFicoScoreOneMember
       
Other consumer 195,128us-gaap_LoansAndLeasesReceivableConsumerOther
/ hban_CreditQualityIndicatorAxis
= hban_CreditRiskProfileByFicoScoreOneMember
       
Automobile loans including automobile loans transferred to loans held for sale 4,165,811hban_AutomobileLoansIncludingHFSSecuritization
/ hban_CreditQualityIndicatorAxis
= hban_CreditRiskProfileByFicoScoreOneMember
2,987,323hban_AutomobileLoansIncludingHFSSecuritization
/ hban_CreditQualityIndicatorAxis
= hban_CreditRiskProfileByFicoScoreOneMember
     
650-749 [Member]          
Loan and lease balances by credit quality indicator          
Home equity 2,521,523us-gaap_LoansAndLeasesReceivableConsumerHomeEquity
/ hban_CreditQualityIndicatorAxis
= hban_CreditRiskProfileByFicoScoreTwoMember
       
Residential mortgage 1,786,272us-gaap_LoansAndLeasesReceivableConsumerMortgage
/ hban_CreditQualityIndicatorAxis
= hban_CreditRiskProfileByFicoScoreTwoMember
       
Other consumer 187,832us-gaap_LoansAndLeasesReceivableConsumerOther
/ hban_CreditQualityIndicatorAxis
= hban_CreditRiskProfileByFicoScoreTwoMember
       
Automobile loans including automobile loans transferred to loans held for sale 3,249,141hban_AutomobileLoansIncludingHFSSecuritization
/ hban_CreditQualityIndicatorAxis
= hban_CreditRiskProfileByFicoScoreTwoMember
2,517,756hban_AutomobileLoansIncludingHFSSecuritization
/ hban_CreditQualityIndicatorAxis
= hban_CreditRiskProfileByFicoScoreTwoMember
     
Less than 650 [Member]          
Loan and lease balances by credit quality indicator          
Home equity 631,977us-gaap_LoansAndLeasesReceivableConsumerHomeEquity
/ hban_CreditQualityIndicatorAxis
= hban_CreditRiskProfileByFicoScoreThreeMember
       
Residential mortgage 666,745us-gaap_LoansAndLeasesReceivableConsumerMortgage
/ hban_CreditQualityIndicatorAxis
= hban_CreditRiskProfileByFicoScoreThreeMember
       
Other consumer 30,582us-gaap_LoansAndLeasesReceivableConsumerOther
/ hban_CreditQualityIndicatorAxis
= hban_CreditRiskProfileByFicoScoreThreeMember
       
Automobile loans including automobile loans transferred to loans held for sale 1,028,381hban_AutomobileLoansIncludingHFSSecuritization
/ hban_CreditQualityIndicatorAxis
= hban_CreditRiskProfileByFicoScoreThreeMember
945,604hban_AutomobileLoansIncludingHFSSecuritization
/ hban_CreditQualityIndicatorAxis
= hban_CreditRiskProfileByFicoScoreThreeMember
     
Other (2) [Member]          
Loan and lease balances by credit quality indicator          
Home equity 249,664us-gaap_LoansAndLeasesReceivableConsumerHomeEquity
/ hban_CreditQualityIndicatorAxis
= hban_CreditRiskProfileByFicoScoreFourMember
       
Residential mortgage 91,688us-gaap_LoansAndLeasesReceivableConsumerMortgage
/ hban_CreditQualityIndicatorAxis
= hban_CreditRiskProfileByFicoScoreFourMember
       
Other consumer 209us-gaap_LoansAndLeasesReceivableConsumerOther
/ hban_CreditQualityIndicatorAxis
= hban_CreditRiskProfileByFicoScoreFourMember
       
Automobile loans including automobile loans transferred to loans held for sale 246,569hban_AutomobileLoansIncludingHFSSecuritization
/ hban_CreditQualityIndicatorAxis
= hban_CreditRiskProfileByFicoScoreFourMember
188,030hban_AutomobileLoansIncludingHFSSecuritization
/ hban_CreditQualityIndicatorAxis
= hban_CreditRiskProfileByFicoScoreFourMember
     
Commercial and industrial owner occupied [Member]          
Loan and lease balances by credit quality indicator          
Total commercial and industrial 4,254,875us-gaap_LoansReceivableCommercialAndIndustrial
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_CommercialAndIndustrialOwnerOccupiedMember
4,347,872us-gaap_LoansReceivableCommercialAndIndustrial
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_CommercialAndIndustrialOwnerOccupiedMember
     
Commercial and industrial owner occupied [Member] | Pass [Member]          
Loan and lease balances by credit quality indicator          
Total commercial and industrial 3,959,046us-gaap_LoansReceivableCommercialAndIndustrial
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_CommercialAndIndustrialOwnerOccupiedMember
/ hban_CreditQualityIndicatorAxis
= us-gaap_PassMember
4,052,579us-gaap_LoansReceivableCommercialAndIndustrial
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_CommercialAndIndustrialOwnerOccupiedMember
/ hban_CreditQualityIndicatorAxis
= us-gaap_PassMember
     
Commercial and industrial owner occupied [Member] | OLEM [Member]          
Loan and lease balances by credit quality indicator          
Total commercial and industrial 117,637us-gaap_LoansReceivableCommercialAndIndustrial
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_CommercialAndIndustrialOwnerOccupiedMember
/ hban_CreditQualityIndicatorAxis
= us-gaap_SpecialMentionMember
130,645us-gaap_LoansReceivableCommercialAndIndustrial
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_CommercialAndIndustrialOwnerOccupiedMember
/ hban_CreditQualityIndicatorAxis
= us-gaap_SpecialMentionMember
     
Commercial and industrial owner occupied [Member] | Substandard [Member]          
Loan and lease balances by credit quality indicator          
Total commercial and industrial 175,767us-gaap_LoansReceivableCommercialAndIndustrial
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_CommercialAndIndustrialOwnerOccupiedMember
/ hban_CreditQualityIndicatorAxis
= us-gaap_SubstandardMember
155,994us-gaap_LoansReceivableCommercialAndIndustrial
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_CommercialAndIndustrialOwnerOccupiedMember
/ hban_CreditQualityIndicatorAxis
= us-gaap_SubstandardMember
     
Commercial and industrial owner occupied [Member] | Doubtful [Member]          
Loan and lease balances by credit quality indicator          
Total commercial and industrial 2,425us-gaap_LoansReceivableCommercialAndIndustrial
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_CommercialAndIndustrialOwnerOccupiedMember
/ hban_CreditQualityIndicatorAxis
= us-gaap_DoubtfulMember
8,654us-gaap_LoansReceivableCommercialAndIndustrial
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_CommercialAndIndustrialOwnerOccupiedMember
/ hban_CreditQualityIndicatorAxis
= us-gaap_DoubtfulMember
     
Commercial and industrial purchased impaired          
Loan and lease balances by credit quality indicator          
Total commercial and industrial 23,228us-gaap_LoansReceivableCommercialAndIndustrial
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_CommercialAndIndustrialPurchasedImpairedMember
       
Commercial and industrial purchased impaired | Pass [Member]          
Loan and lease balances by credit quality indicator          
Total commercial and industrial 3,915us-gaap_LoansReceivableCommercialAndIndustrial
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_CommercialAndIndustrialPurchasedImpairedMember
/ hban_CreditQualityIndicatorAxis
= us-gaap_PassMember
5,015us-gaap_LoansReceivableCommercialAndIndustrial
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_CommercialAndIndustrialPurchasedImpairedMember
/ hban_CreditQualityIndicatorAxis
= us-gaap_PassMember
     
Commercial and industrial purchased impaired | OLEM [Member]          
Loan and lease balances by credit quality indicator          
Total commercial and industrial 741us-gaap_LoansReceivableCommercialAndIndustrial
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_CommercialAndIndustrialPurchasedImpairedMember
/ hban_CreditQualityIndicatorAxis
= us-gaap_SpecialMentionMember
661us-gaap_LoansReceivableCommercialAndIndustrial
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_CommercialAndIndustrialPurchasedImpairedMember
/ hban_CreditQualityIndicatorAxis
= us-gaap_SpecialMentionMember
     
Commercial and industrial purchased impaired | Substandard [Member]          
Loan and lease balances by credit quality indicator          
Total commercial and industrial 14,901us-gaap_LoansReceivableCommercialAndIndustrial
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_CommercialAndIndustrialPurchasedImpairedMember
/ hban_CreditQualityIndicatorAxis
= us-gaap_SubstandardMember
27,693us-gaap_LoansReceivableCommercialAndIndustrial
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_CommercialAndIndustrialPurchasedImpairedMember
/ hban_CreditQualityIndicatorAxis
= us-gaap_SubstandardMember
     
Commercial and industrial purchased impaired | Doubtful [Member]          
Loan and lease balances by credit quality indicator          
Total commercial and industrial 3,671us-gaap_LoansReceivableCommercialAndIndustrial
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_CommercialAndIndustrialPurchasedImpairedMember
/ hban_CreditQualityIndicatorAxis
= us-gaap_DoubtfulMember
2,157us-gaap_LoansReceivableCommercialAndIndustrial
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_CommercialAndIndustrialPurchasedImpairedMember
/ hban_CreditQualityIndicatorAxis
= us-gaap_DoubtfulMember
     
Commercial and industrial purchased impaired | Total          
Loan and lease balances by credit quality indicator          
Total commercial and industrial   35,526us-gaap_LoansReceivableCommercialAndIndustrial
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_CommercialAndIndustrialPurchasedImpairedMember
/ hban_CreditQualityIndicatorAxis
= hban_CreditRiskProfileByUcsClassificationMember
     
Other commercial and industrial [Member]          
Loan and lease balances by credit quality indicator          
Total commercial and industrial 14,755,043us-gaap_LoansReceivableCommercialAndIndustrial
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_CommercialAndIndustrialOtherMember
13,210,878us-gaap_LoansReceivableCommercialAndIndustrial
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_CommercialAndIndustrialOtherMember
     
Other commercial and industrial [Member] | Pass [Member]          
Loan and lease balances by credit quality indicator          
Total commercial and industrial 13,925,334us-gaap_LoansReceivableCommercialAndIndustrial
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_CommercialAndIndustrialOtherMember
/ hban_CreditQualityIndicatorAxis
= us-gaap_PassMember
12,630,512us-gaap_LoansReceivableCommercialAndIndustrial
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_CommercialAndIndustrialOtherMember
/ hban_CreditQualityIndicatorAxis
= us-gaap_PassMember
     
Other commercial and industrial [Member] | OLEM [Member]          
Loan and lease balances by credit quality indicator          
Total commercial and industrial 386,666us-gaap_LoansReceivableCommercialAndIndustrial
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_CommercialAndIndustrialOtherMember
/ hban_CreditQualityIndicatorAxis
= us-gaap_SpecialMentionMember
211,860us-gaap_LoansReceivableCommercialAndIndustrial
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_CommercialAndIndustrialOtherMember
/ hban_CreditQualityIndicatorAxis
= us-gaap_SpecialMentionMember
     
Other commercial and industrial [Member] | Substandard [Member]          
Loan and lease balances by credit quality indicator          
Total commercial and industrial 440,036us-gaap_LoansReceivableCommercialAndIndustrial
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_CommercialAndIndustrialOtherMember
/ hban_CreditQualityIndicatorAxis
= us-gaap_SubstandardMember
364,343us-gaap_LoansReceivableCommercialAndIndustrial
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_CommercialAndIndustrialOtherMember
/ hban_CreditQualityIndicatorAxis
= us-gaap_SubstandardMember
     
Other commercial and industrial [Member] | Doubtful [Member]          
Loan and lease balances by credit quality indicator          
Total commercial and industrial 3,007us-gaap_LoansReceivableCommercialAndIndustrial
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_CommercialAndIndustrialOtherMember
/ hban_CreditQualityIndicatorAxis
= us-gaap_DoubtfulMember
4,163us-gaap_LoansReceivableCommercialAndIndustrial
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_CommercialAndIndustrialOtherMember
/ hban_CreditQualityIndicatorAxis
= us-gaap_DoubtfulMember
     
Commercial and Industrial [Member]          
Allowance For Credit Losses Roll Forward [Abstract]          
ALLL balance, beginning of period 265,801us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_CommercialAndIndustrialMember
  241,051us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_CommercialAndIndustrialMember
  275,367us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_CommercialAndIndustrialMember
Recoveries of loans previously charged-off 44,531hban_RecoveriesOfLoansPreviouslyChargedoff
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_CommercialAndIndustrialMember
29,514hban_RecoveriesOfLoansPreviouslyChargedoff
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_CommercialAndIndustrialMember
37,227hban_RecoveriesOfLoansPreviouslyChargedoff
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_CommercialAndIndustrialMember
   
Loan charge-offs (76,654)us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_CommercialAndIndustrialMember
(45,904)us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_CommercialAndIndustrialMember
(101,475)us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_CommercialAndIndustrialMember
   
Provision for loan and lease losses 53,317hban_ProvisionForLoanAndLeaseLosse
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_CommercialAndIndustrialMember
41,140hban_ProvisionForLoanAndLeaseLosse
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_CommercialAndIndustrialMember
29,932hban_ProvisionForLoanAndLeaseLosse
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_CommercialAndIndustrialMember
   
Allowance for loans sold or transferred to hoans held for sale 0hban_AllowanceForLoansSoldOrTransferredToLoansHeldForSale
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_CommercialAndIndustrialMember
0hban_AllowanceForLoansSoldOrTransferredToLoansHeldForSale
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_CommercialAndIndustrialMember
0hban_AllowanceForLoansSoldOrTransferredToLoansHeldForSale
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_CommercialAndIndustrialMember
   
ALLL balance, end of period 286,995us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_CommercialAndIndustrialMember
265,801us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_CommercialAndIndustrialMember
    275,367us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_CommercialAndIndustrialMember
AULC balance, beginning of period 49,596hban_ULCBalanceBeginningOfPeriod
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_CommercialAndIndustrialMember
  33,868hban_ULCBalanceBeginningOfPeriod
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_CommercialAndIndustrialMember
  39,658hban_ULCBalanceBeginningOfPeriod
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_CommercialAndIndustrialMember
Provision for unfunded loan commitments and letters of credit (608)hban_ProvisionForUnfundedLoanCommitmentsAndLettersOfCredit
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_CommercialAndIndustrialMember
15,728hban_ProvisionForUnfundedLoanCommitmentsAndLettersOfCredit
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_CommercialAndIndustrialMember
(5,790)hban_ProvisionForUnfundedLoanCommitmentsAndLettersOfCredit
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_CommercialAndIndustrialMember
   
AULC Balance, end of period 48,988hban_AulcBalanceEndOfPeriod
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_CommercialAndIndustrialMember
49,596hban_AulcBalanceEndOfPeriod
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_CommercialAndIndustrialMember
  33,868hban_AulcBalanceEndOfPeriod
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_CommercialAndIndustrialMember
 
ACL balance, end of period 335,983hban_AclBalanceEndOfPeriod
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_CommercialAndIndustrialMember
315,397hban_AclBalanceEndOfPeriod
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_CommercialAndIndustrialMember
  274,919hban_AclBalanceEndOfPeriod
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_CommercialAndIndustrialMember
 
Commercial real estate retail properties [Member]          
Loan and lease balances by credit quality indicator          
Total commercial real estate 1,357,746us-gaap_LoansReceivableCommercialRealEstate
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_CommercialRealEstateRetailPropertiesMember
1,263,569us-gaap_LoansReceivableCommercialRealEstate
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_CommercialRealEstateRetailPropertiesMember
     
Commercial real estate retail properties [Member] | Pass [Member]          
Loan and lease balances by credit quality indicator          
Total commercial real estate 1,279,064us-gaap_LoansReceivableCommercialRealEstate
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_CommercialRealEstateRetailPropertiesMember
/ hban_CreditQualityIndicatorAxis
= us-gaap_PassMember
1,153,747us-gaap_LoansReceivableCommercialRealEstate
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_CommercialRealEstateRetailPropertiesMember
/ hban_CreditQualityIndicatorAxis
= us-gaap_PassMember
     
Commercial real estate retail properties [Member] | OLEM [Member]          
Loan and lease balances by credit quality indicator          
Total commercial real estate 10,204us-gaap_LoansReceivableCommercialRealEstate
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_CommercialRealEstateRetailPropertiesMember
/ hban_CreditQualityIndicatorAxis
= us-gaap_SpecialMentionMember
16,003us-gaap_LoansReceivableCommercialRealEstate
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_CommercialRealEstateRetailPropertiesMember
/ hban_CreditQualityIndicatorAxis
= us-gaap_SpecialMentionMember
     
Commercial real estate retail properties [Member] | Substandard [Member]          
Loan and lease balances by credit quality indicator          
Total commercial real estate 67,911us-gaap_LoansReceivableCommercialRealEstate
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_CommercialRealEstateRetailPropertiesMember
/ hban_CreditQualityIndicatorAxis
= us-gaap_SubstandardMember
93,819us-gaap_LoansReceivableCommercialRealEstate
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_CommercialRealEstateRetailPropertiesMember
/ hban_CreditQualityIndicatorAxis
= us-gaap_SubstandardMember
     
Commercial real estate retail properties [Member] | Doubtful [Member]          
Loan and lease balances by credit quality indicator          
Total commercial real estate 567us-gaap_LoansReceivableCommercialRealEstate
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_CommercialRealEstateRetailPropertiesMember
/ hban_CreditQualityIndicatorAxis
= us-gaap_DoubtfulMember
0us-gaap_LoansReceivableCommercialRealEstate
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_CommercialRealEstateRetailPropertiesMember
/ hban_CreditQualityIndicatorAxis
= us-gaap_DoubtfulMember
     
Commercial real estate Multi family [Member]          
Loan and lease balances by credit quality indicator          
Total commercial real estate 1,090,416us-gaap_LoansReceivableCommercialRealEstate
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_CommercialRealEstateMultiFamilyMember
1,025,591us-gaap_LoansReceivableCommercialRealEstate
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_CommercialRealEstateMultiFamilyMember
     
Commercial real estate Multi family [Member] | Pass [Member]          
Loan and lease balances by credit quality indicator          
Total commercial real estate 1,044,521us-gaap_LoansReceivableCommercialRealEstate
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_CommercialRealEstateMultiFamilyMember
/ hban_CreditQualityIndicatorAxis
= us-gaap_PassMember
972,526us-gaap_LoansReceivableCommercialRealEstate
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_CommercialRealEstateMultiFamilyMember
/ hban_CreditQualityIndicatorAxis
= us-gaap_PassMember
     
Commercial real estate Multi family [Member] | OLEM [Member]          
Loan and lease balances by credit quality indicator          
Total commercial real estate 12,608us-gaap_LoansReceivableCommercialRealEstate
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_CommercialRealEstateMultiFamilyMember
/ hban_CreditQualityIndicatorAxis
= us-gaap_SpecialMentionMember
16,540us-gaap_LoansReceivableCommercialRealEstate
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_CommercialRealEstateMultiFamilyMember
/ hban_CreditQualityIndicatorAxis
= us-gaap_SpecialMentionMember
     
Commercial real estate Multi family [Member] | Substandard [Member]          
Loan and lease balances by credit quality indicator          
Total commercial real estate 32,322us-gaap_LoansReceivableCommercialRealEstate
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_CommercialRealEstateMultiFamilyMember
/ hban_CreditQualityIndicatorAxis
= us-gaap_SubstandardMember
36,411us-gaap_LoansReceivableCommercialRealEstate
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_CommercialRealEstateMultiFamilyMember
/ hban_CreditQualityIndicatorAxis
= us-gaap_SubstandardMember
     
Commercial real estate Multi family [Member] | Doubtful [Member]          
Loan and lease balances by credit quality indicator          
Total commercial real estate 965us-gaap_LoansReceivableCommercialRealEstate
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_CommercialRealEstateMultiFamilyMember
/ hban_CreditQualityIndicatorAxis
= us-gaap_DoubtfulMember
114us-gaap_LoansReceivableCommercialRealEstate
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_CommercialRealEstateMultiFamilyMember
/ hban_CreditQualityIndicatorAxis
= us-gaap_DoubtfulMember
     
Commercial real estate office [Member]          
Loan and lease balances by credit quality indicator          
Total commercial real estate 980,303us-gaap_LoansReceivableCommercialRealEstate
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_CommercialRealEstateOfficeMember
942,293us-gaap_LoansReceivableCommercialRealEstate
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_CommercialRealEstateOfficeMember
     
Commercial real estate office [Member] | Pass [Member]          
Loan and lease balances by credit quality indicator          
Total commercial real estate 902,474us-gaap_LoansReceivableCommercialRealEstate
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_CommercialRealEstateOfficeMember
/ hban_CreditQualityIndicatorAxis
= us-gaap_PassMember
847,411us-gaap_LoansReceivableCommercialRealEstate
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_CommercialRealEstateOfficeMember
/ hban_CreditQualityIndicatorAxis
= us-gaap_PassMember
     
Commercial real estate office [Member] | OLEM [Member]          
Loan and lease balances by credit quality indicator          
Total commercial real estate 33,107us-gaap_LoansReceivableCommercialRealEstate
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_CommercialRealEstateOfficeMember
/ hban_CreditQualityIndicatorAxis
= us-gaap_SpecialMentionMember
4,866us-gaap_LoansReceivableCommercialRealEstate
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_CommercialRealEstateOfficeMember
/ hban_CreditQualityIndicatorAxis
= us-gaap_SpecialMentionMember
     
Commercial real estate office [Member] | Substandard [Member]          
Loan and lease balances by credit quality indicator          
Total commercial real estate 42,578us-gaap_LoansReceivableCommercialRealEstate
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_CommercialRealEstateOfficeMember
/ hban_CreditQualityIndicatorAxis
= us-gaap_SubstandardMember
87,722us-gaap_LoansReceivableCommercialRealEstate
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_CommercialRealEstateOfficeMember
/ hban_CreditQualityIndicatorAxis
= us-gaap_SubstandardMember
     
Commercial real estate office [Member] | Doubtful [Member]          
Loan and lease balances by credit quality indicator          
Total commercial real estate 2,144us-gaap_LoansReceivableCommercialRealEstate
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_CommercialRealEstateOfficeMember
/ hban_CreditQualityIndicatorAxis
= us-gaap_DoubtfulMember
2,294us-gaap_LoansReceivableCommercialRealEstate
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_CommercialRealEstateOfficeMember
/ hban_CreditQualityIndicatorAxis
= us-gaap_DoubtfulMember
     
Commercial real estate Industrial and warehouse [Member]          
Loan and lease balances by credit quality indicator          
Total commercial real estate 513,401us-gaap_LoansReceivableCommercialRealEstate
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_CommercialRealEstateIndustrialAndWarehouseMember
472,893us-gaap_LoansReceivableCommercialRealEstate
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_CommercialRealEstateIndustrialAndWarehouseMember
     
Commercial real estate Industrial and warehouse [Member] | Pass [Member]          
Loan and lease balances by credit quality indicator          
Total commercial real estate 487,454us-gaap_LoansReceivableCommercialRealEstate
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_CommercialRealEstateIndustrialAndWarehouseMember
/ hban_CreditQualityIndicatorAxis
= us-gaap_PassMember
431,057us-gaap_LoansReceivableCommercialRealEstate
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_CommercialRealEstateIndustrialAndWarehouseMember
/ hban_CreditQualityIndicatorAxis
= us-gaap_PassMember
     
Commercial real estate Industrial and warehouse [Member] | OLEM [Member]          
Loan and lease balances by credit quality indicator          
Total commercial real estate 7,877us-gaap_LoansReceivableCommercialRealEstate
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_CommercialRealEstateIndustrialAndWarehouseMember
/ hban_CreditQualityIndicatorAxis
= us-gaap_SpecialMentionMember
14,138us-gaap_LoansReceivableCommercialRealEstate
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_CommercialRealEstateIndustrialAndWarehouseMember
/ hban_CreditQualityIndicatorAxis
= us-gaap_SpecialMentionMember
     
Commercial real estate Industrial and warehouse [Member] | Substandard [Member]          
Loan and lease balances by credit quality indicator          
Total commercial real estate 17,781us-gaap_LoansReceivableCommercialRealEstate
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_CommercialRealEstateIndustrialAndWarehouseMember
/ hban_CreditQualityIndicatorAxis
= us-gaap_SubstandardMember
27,698us-gaap_LoansReceivableCommercialRealEstate
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_CommercialRealEstateIndustrialAndWarehouseMember
/ hban_CreditQualityIndicatorAxis
= us-gaap_SubstandardMember
     
Commercial real estate Industrial and warehouse [Member] | Doubtful [Member]          
Loan and lease balances by credit quality indicator          
Total commercial real estate 289us-gaap_LoansReceivableCommercialRealEstate
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_CommercialRealEstateIndustrialAndWarehouseMember
/ hban_CreditQualityIndicatorAxis
= us-gaap_DoubtfulMember
0us-gaap_LoansReceivableCommercialRealEstate
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_CommercialRealEstateIndustrialAndWarehouseMember
/ hban_CreditQualityIndicatorAxis
= us-gaap_DoubtfulMember
     
Commercial real estate purchased impaired          
Loan and lease balances by credit quality indicator          
Total commercial real estate 38,371us-gaap_LoansReceivableCommercialRealEstate
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_CommercialRealEstatePurchasedImpairedMember
       
Commercial real estate purchased impaired | Pass [Member]          
Loan and lease balances by credit quality indicator          
Total commercial real estate 6,914us-gaap_LoansReceivableCommercialRealEstate
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_CommercialRealEstatePurchasedImpairedMember
/ hban_CreditQualityIndicatorAxis
= us-gaap_PassMember
13,127us-gaap_LoansReceivableCommercialRealEstate
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_CommercialRealEstatePurchasedImpairedMember
/ hban_CreditQualityIndicatorAxis
= us-gaap_PassMember
     
Commercial real estate purchased impaired | OLEM [Member]          
Loan and lease balances by credit quality indicator          
Total commercial real estate 803us-gaap_LoansReceivableCommercialRealEstate
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_CommercialRealEstatePurchasedImpairedMember
/ hban_CreditQualityIndicatorAxis
= us-gaap_SpecialMentionMember
3,586us-gaap_LoansReceivableCommercialRealEstate
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_CommercialRealEstatePurchasedImpairedMember
/ hban_CreditQualityIndicatorAxis
= us-gaap_SpecialMentionMember
     
Commercial real estate purchased impaired | Substandard [Member]          
Loan and lease balances by credit quality indicator          
Total commercial real estate 25,460us-gaap_LoansReceivableCommercialRealEstate
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_CommercialRealEstatePurchasedImpairedMember
/ hban_CreditQualityIndicatorAxis
= us-gaap_SubstandardMember
62,577us-gaap_LoansReceivableCommercialRealEstate
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_CommercialRealEstatePurchasedImpairedMember
/ hban_CreditQualityIndicatorAxis
= us-gaap_SubstandardMember
     
Commercial real estate purchased impaired | Doubtful [Member]          
Loan and lease balances by credit quality indicator          
Total commercial real estate 5,194us-gaap_LoansReceivableCommercialRealEstate
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_CommercialRealEstatePurchasedImpairedMember
/ hban_CreditQualityIndicatorAxis
= us-gaap_DoubtfulMember
2,783us-gaap_LoansReceivableCommercialRealEstate
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_CommercialRealEstatePurchasedImpairedMember
/ hban_CreditQualityIndicatorAxis
= us-gaap_DoubtfulMember
     
Commercial real estate purchased impaired | Total          
Loan and lease balances by credit quality indicator          
Total commercial real estate   82,073us-gaap_LoansReceivableCommercialRealEstate
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_CommercialRealEstatePurchasedImpairedMember
/ hban_CreditQualityIndicatorAxis
= hban_CreditRiskProfileByUcsClassificationMember
     
Other commercial real estate [Member]          
Loan and lease balances by credit quality indicator          
Total commercial real estate 1,217,166us-gaap_LoansReceivableCommercialRealEstate
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_CommercialRealEstateOtherMember
1,063,675us-gaap_LoansReceivableCommercialRealEstate
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_CommercialRealEstateOtherMember
     
Other commercial real estate [Member] | Pass [Member]          
Loan and lease balances by credit quality indicator          
Total commercial real estate 1,166,293us-gaap_LoansReceivableCommercialRealEstate
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_CommercialRealEstateOtherMember
/ hban_CreditQualityIndicatorAxis
= us-gaap_PassMember
977,987us-gaap_LoansReceivableCommercialRealEstate
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_CommercialRealEstateOtherMember
/ hban_CreditQualityIndicatorAxis
= us-gaap_PassMember
     
Other commercial real estate [Member] | OLEM [Member]          
Loan and lease balances by credit quality indicator          
Total commercial real estate 9,635us-gaap_LoansReceivableCommercialRealEstate
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_CommercialRealEstateOtherMember
/ hban_CreditQualityIndicatorAxis
= us-gaap_SpecialMentionMember
16,270us-gaap_LoansReceivableCommercialRealEstate
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_CommercialRealEstateOtherMember
/ hban_CreditQualityIndicatorAxis
= us-gaap_SpecialMentionMember
     
Other commercial real estate [Member] | Substandard [Member]          
Loan and lease balances by credit quality indicator          
Total commercial real estate 40,019us-gaap_LoansReceivableCommercialRealEstate
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_CommercialRealEstateOtherMember
/ hban_CreditQualityIndicatorAxis
= us-gaap_SubstandardMember
68,653us-gaap_LoansReceivableCommercialRealEstate
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_CommercialRealEstateOtherMember
/ hban_CreditQualityIndicatorAxis
= us-gaap_SubstandardMember
     
Other commercial real estate [Member] | Doubtful [Member]          
Loan and lease balances by credit quality indicator          
Total commercial real estate 1,219us-gaap_LoansReceivableCommercialRealEstate
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_CommercialRealEstateOtherMember
/ hban_CreditQualityIndicatorAxis
= us-gaap_DoubtfulMember
765us-gaap_LoansReceivableCommercialRealEstate
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_CommercialRealEstateOtherMember
/ hban_CreditQualityIndicatorAxis
= us-gaap_DoubtfulMember
     
Commercial Real Estate [Member]          
Allowance For Credit Losses Roll Forward [Abstract]          
ALLL balance, beginning of period 162,557us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialRealEstateMember
  285,369us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialRealEstateMember
  388,706us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialRealEstateMember
Recoveries of loans previously charged-off 34,071hban_RecoveriesOfLoansPreviouslyChargedoff
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialRealEstateMember
44,658hban_RecoveriesOfLoansPreviouslyChargedoff
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialRealEstateMember
39,622hban_RecoveriesOfLoansPreviouslyChargedoff
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialRealEstateMember
   
Loan charge-offs (24,704)us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialRealEstateMember
(69,512)us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialRealEstateMember
(118,051)us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialRealEstateMember
   
Provision for loan and lease losses (69,085)hban_ProvisionForLoanAndLeaseLosse
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialRealEstateMember
(97,958)hban_ProvisionForLoanAndLeaseLosse
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialRealEstateMember
(24,908)hban_ProvisionForLoanAndLeaseLosse
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialRealEstateMember
   
Allowance for loans sold or transferred to hoans held for sale 0hban_AllowanceForLoansSoldOrTransferredToLoansHeldForSale
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialRealEstateMember
0hban_AllowanceForLoansSoldOrTransferredToLoansHeldForSale
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialRealEstateMember
0hban_AllowanceForLoansSoldOrTransferredToLoansHeldForSale
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialRealEstateMember
   
ALLL balance, end of period 102,839us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialRealEstateMember
162,557us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialRealEstateMember
    388,706us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialRealEstateMember
AULC balance, beginning of period 9,891hban_ULCBalanceBeginningOfPeriod
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialRealEstateMember
  4,740hban_ULCBalanceBeginningOfPeriod
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialRealEstateMember
  5,852hban_ULCBalanceBeginningOfPeriod
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialRealEstateMember
Provision for unfunded loan commitments and letters of credit (3,850)hban_ProvisionForUnfundedLoanCommitmentsAndLettersOfCredit
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialRealEstateMember
5,151hban_ProvisionForUnfundedLoanCommitmentsAndLettersOfCredit
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialRealEstateMember
(1,112)hban_ProvisionForUnfundedLoanCommitmentsAndLettersOfCredit
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialRealEstateMember
   
AULC Balance, end of period 6,041hban_AulcBalanceEndOfPeriod
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialRealEstateMember
9,891hban_AulcBalanceEndOfPeriod
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialRealEstateMember
  4,740hban_AulcBalanceEndOfPeriod
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialRealEstateMember
 
ACL balance, end of period 108,880hban_AclBalanceEndOfPeriod
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialRealEstateMember
172,448hban_AclBalanceEndOfPeriod
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialRealEstateMember
  290,109hban_AclBalanceEndOfPeriod
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialRealEstateMember
 
Automobile Loan [Member]          
Allowance For Credit Losses Roll Forward [Abstract]          
ALLL balance, beginning of period 31,053us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_AutomobileLoanMember
  34,979us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_AutomobileLoanMember
  38,282us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_AutomobileLoanMember
Recoveries of loans previously charged-off 13,762hban_RecoveriesOfLoansPreviouslyChargedoff
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_AutomobileLoanMember
13,375hban_RecoveriesOfLoansPreviouslyChargedoff
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_AutomobileLoanMember
16,628hban_RecoveriesOfLoansPreviouslyChargedoff
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_AutomobileLoanMember
   
Loan charge-offs (31,330)us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_AutomobileLoanMember
(23,912)us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_AutomobileLoanMember
(26,070)us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_AutomobileLoanMember
   
Provision for loan and lease losses 19,981hban_ProvisionForLoanAndLeaseLosse
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_AutomobileLoanMember
6,611hban_ProvisionForLoanAndLeaseLosse
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_AutomobileLoanMember
12,964hban_ProvisionForLoanAndLeaseLosse
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_AutomobileLoanMember
   
Allowance for loans sold or transferred to hoans held for sale 0hban_AllowanceForLoansSoldOrTransferredToLoansHeldForSale
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_AutomobileLoanMember
0hban_AllowanceForLoansSoldOrTransferredToLoansHeldForSale
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_AutomobileLoanMember
(6,825)hban_AllowanceForLoansSoldOrTransferredToLoansHeldForSale
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_AutomobileLoanMember
   
ALLL balance, end of period 33,466us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_AutomobileLoanMember
31,053us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_AutomobileLoanMember
    38,282us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_AutomobileLoanMember
AULC balance, beginning of period 0hban_ULCBalanceBeginningOfPeriod
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_AutomobileLoanMember
  0hban_ULCBalanceBeginningOfPeriod
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_AutomobileLoanMember
  0hban_ULCBalanceBeginningOfPeriod
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_AutomobileLoanMember
Provision for unfunded loan commitments and letters of credit 0hban_ProvisionForUnfundedLoanCommitmentsAndLettersOfCredit
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_AutomobileLoanMember
0hban_ProvisionForUnfundedLoanCommitmentsAndLettersOfCredit
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_AutomobileLoanMember
0hban_ProvisionForUnfundedLoanCommitmentsAndLettersOfCredit
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_AutomobileLoanMember
   
AULC Balance, end of period 0hban_AulcBalanceEndOfPeriod
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_AutomobileLoanMember
0hban_AulcBalanceEndOfPeriod
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_AutomobileLoanMember
  0hban_AulcBalanceEndOfPeriod
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_AutomobileLoanMember
 
ACL balance, end of period 33,466hban_AclBalanceEndOfPeriod
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_AutomobileLoanMember
31,053hban_AclBalanceEndOfPeriod
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_AutomobileLoanMember
  34,979hban_AclBalanceEndOfPeriod
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_AutomobileLoanMember
 
Home equity secured by first-lien other [Member]          
Loan and lease balances by credit quality indicator          
Home equity 5,128,804us-gaap_LoansAndLeasesReceivableConsumerHomeEquity
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_HomeEquitySecuredByFirstLienOtherMember
4,842,144us-gaap_LoansAndLeasesReceivableConsumerHomeEquity
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_HomeEquitySecuredByFirstLienOtherMember
     
Home equity secured by first-lien other [Member] | 750+[Member]          
Loan and lease balances by credit quality indicator          
Home equity 3,255,088us-gaap_LoansAndLeasesReceivableConsumerHomeEquity
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_HomeEquitySecuredByFirstLienOtherMember
/ hban_CreditQualityIndicatorAxis
= hban_CreditRiskProfileByFicoScoreOneMember
3,018,784us-gaap_LoansAndLeasesReceivableConsumerHomeEquity
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_HomeEquitySecuredByFirstLienOtherMember
/ hban_CreditQualityIndicatorAxis
= hban_CreditRiskProfileByFicoScoreOneMember
     
Home equity secured by first-lien other [Member] | 650-749 [Member]          
Loan and lease balances by credit quality indicator          
Home equity 1,426,191us-gaap_LoansAndLeasesReceivableConsumerHomeEquity
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_HomeEquitySecuredByFirstLienOtherMember
/ hban_CreditQualityIndicatorAxis
= hban_CreditRiskProfileByFicoScoreTwoMember
1,412,445us-gaap_LoansAndLeasesReceivableConsumerHomeEquity
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_HomeEquitySecuredByFirstLienOtherMember
/ hban_CreditQualityIndicatorAxis
= hban_CreditRiskProfileByFicoScoreTwoMember
     
Home equity secured by first-lien other [Member] | Less than 650 [Member]          
Loan and lease balances by credit quality indicator          
Home equity 283,152us-gaap_LoansAndLeasesReceivableConsumerHomeEquity
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_HomeEquitySecuredByFirstLienOtherMember
/ hban_CreditQualityIndicatorAxis
= hban_CreditRiskProfileByFicoScoreThreeMember
299,681us-gaap_LoansAndLeasesReceivableConsumerHomeEquity
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_HomeEquitySecuredByFirstLienOtherMember
/ hban_CreditQualityIndicatorAxis
= hban_CreditRiskProfileByFicoScoreThreeMember
     
Home equity secured by first-lien other [Member] | Other (2) [Member]          
Loan and lease balances by credit quality indicator          
Home equity 164,373us-gaap_LoansAndLeasesReceivableConsumerHomeEquity
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_HomeEquitySecuredByFirstLienOtherMember
/ hban_CreditQualityIndicatorAxis
= hban_CreditRiskProfileByFicoScoreFourMember
111,234us-gaap_LoansAndLeasesReceivableConsumerHomeEquity
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_HomeEquitySecuredByFirstLienOtherMember
/ hban_CreditQualityIndicatorAxis
= hban_CreditRiskProfileByFicoScoreFourMember
     
Home equity secured by junior-lien [Member]          
Loan and lease balances by credit quality indicator          
Home equity 3,362,111us-gaap_LoansAndLeasesReceivableConsumerHomeEquity
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_HomeEquitySecuredBySecondLienMember
3,494,174us-gaap_LoansAndLeasesReceivableConsumerHomeEquity
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_HomeEquitySecuredBySecondLienMember
     
Home equity secured by junior-lien [Member] | 750+[Member]          
Loan and lease balances by credit quality indicator          
Home equity 1,832,663us-gaap_LoansAndLeasesReceivableConsumerHomeEquity
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_HomeEquitySecuredBySecondLienMember
/ hban_CreditQualityIndicatorAxis
= hban_CreditRiskProfileByFicoScoreOneMember
1,811,102us-gaap_LoansAndLeasesReceivableConsumerHomeEquity
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_HomeEquitySecuredBySecondLienMember
/ hban_CreditQualityIndicatorAxis
= hban_CreditRiskProfileByFicoScoreOneMember
     
Home equity secured by junior-lien [Member] | 650-749 [Member]          
Loan and lease balances by credit quality indicator          
Home equity 1,095,332us-gaap_LoansAndLeasesReceivableConsumerHomeEquity
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_HomeEquitySecuredBySecondLienMember
/ hban_CreditQualityIndicatorAxis
= hban_CreditRiskProfileByFicoScoreTwoMember
1,213,024us-gaap_LoansAndLeasesReceivableConsumerHomeEquity
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_HomeEquitySecuredBySecondLienMember
/ hban_CreditQualityIndicatorAxis
= hban_CreditRiskProfileByFicoScoreTwoMember
     
Home equity secured by junior-lien [Member] | Less than 650 [Member]          
Loan and lease balances by credit quality indicator          
Home equity 348,825us-gaap_LoansAndLeasesReceivableConsumerHomeEquity
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_HomeEquitySecuredBySecondLienMember
/ hban_CreditQualityIndicatorAxis
= hban_CreditRiskProfileByFicoScoreThreeMember
413,695us-gaap_LoansAndLeasesReceivableConsumerHomeEquity
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_HomeEquitySecuredBySecondLienMember
/ hban_CreditQualityIndicatorAxis
= hban_CreditRiskProfileByFicoScoreThreeMember
     
Home equity secured by junior-lien [Member] | Other (2) [Member]          
Loan and lease balances by credit quality indicator          
Home equity 85,291us-gaap_LoansAndLeasesReceivableConsumerHomeEquity
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_HomeEquitySecuredBySecondLienMember
/ hban_CreditQualityIndicatorAxis
= hban_CreditRiskProfileByFicoScoreFourMember
56,353us-gaap_LoansAndLeasesReceivableConsumerHomeEquity
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_HomeEquitySecuredBySecondLienMember
/ hban_CreditQualityIndicatorAxis
= hban_CreditRiskProfileByFicoScoreFourMember
     
Home Equity [Member]          
Allowance For Credit Losses Roll Forward [Abstract]          
ALLL balance, beginning of period 111,131us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_HomeEquityMember
  118,764us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_HomeEquityMember
  143,873us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_HomeEquityMember
Recoveries of loans previously charged-off 17,526hban_RecoveriesOfLoansPreviouslyChargedoff
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_HomeEquityMember
15,921hban_RecoveriesOfLoansPreviouslyChargedoff
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_HomeEquityMember
7,907hban_RecoveriesOfLoansPreviouslyChargedoff
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_HomeEquityMember
   
Loan charge-offs (54,473)us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_HomeEquityMember
(98,184)us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_HomeEquityMember
(124,286)us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_HomeEquityMember
   
Provision for loan and lease losses 22,229hban_ProvisionForLoanAndLeaseLosse
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_HomeEquityMember
74,630hban_ProvisionForLoanAndLeaseLosse
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_HomeEquityMember
91,270hban_ProvisionForLoanAndLeaseLosse
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_HomeEquityMember
   
Allowance for loans sold or transferred to hoans held for sale 0hban_AllowanceForLoansSoldOrTransferredToLoansHeldForSale
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_HomeEquityMember
0hban_AllowanceForLoansSoldOrTransferredToLoansHeldForSale
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_HomeEquityMember
0hban_AllowanceForLoansSoldOrTransferredToLoansHeldForSale
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_HomeEquityMember
   
ALLL balance, end of period 96,413us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_HomeEquityMember
111,131us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_HomeEquityMember
    143,873us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_HomeEquityMember
AULC balance, beginning of period 1,763hban_ULCBalanceBeginningOfPeriod
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_HomeEquityMember
  1,356hban_ULCBalanceBeginningOfPeriod
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_HomeEquityMember
  2,134hban_ULCBalanceBeginningOfPeriod
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_HomeEquityMember
Provision for unfunded loan commitments and letters of credit 161hban_ProvisionForUnfundedLoanCommitmentsAndLettersOfCredit
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_HomeEquityMember
407hban_ProvisionForUnfundedLoanCommitmentsAndLettersOfCredit
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_HomeEquityMember
(778)hban_ProvisionForUnfundedLoanCommitmentsAndLettersOfCredit
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_HomeEquityMember
   
AULC Balance, end of period 1,924hban_AulcBalanceEndOfPeriod
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_HomeEquityMember
1,763hban_AulcBalanceEndOfPeriod
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_HomeEquityMember
  1,356hban_AulcBalanceEndOfPeriod
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_HomeEquityMember
 
ACL balance, end of period 98,337hban_AclBalanceEndOfPeriod
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_HomeEquityMember
112,894hban_AclBalanceEndOfPeriod
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_HomeEquityMember
  120,120hban_AclBalanceEndOfPeriod
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_HomeEquityMember
 
Home Equity [Member] | 750+[Member]          
Loan and lease balances by credit quality indicator          
Home equity   4,829,886us-gaap_LoansAndLeasesReceivableConsumerHomeEquity
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_HomeEquityMember
/ hban_CreditQualityIndicatorAxis
= hban_CreditRiskProfileByFicoScoreOneMember
     
Home Equity [Member] | 650-749 [Member]          
Loan and lease balances by credit quality indicator          
Home equity   2,625,469us-gaap_LoansAndLeasesReceivableConsumerHomeEquity
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_HomeEquityMember
/ hban_CreditQualityIndicatorAxis
= hban_CreditRiskProfileByFicoScoreTwoMember
     
Home Equity [Member] | Less than 650 [Member]          
Loan and lease balances by credit quality indicator          
Home equity   713,376us-gaap_LoansAndLeasesReceivableConsumerHomeEquity
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_HomeEquityMember
/ hban_CreditQualityIndicatorAxis
= hban_CreditRiskProfileByFicoScoreThreeMember
     
Home Equity [Member] | Other (2) [Member]          
Loan and lease balances by credit quality indicator          
Home equity   167,587us-gaap_LoansAndLeasesReceivableConsumerHomeEquity
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_HomeEquityMember
/ hban_CreditQualityIndicatorAxis
= hban_CreditRiskProfileByFicoScoreFourMember
     
Home Equity [Member] | Total          
Loan and lease balances by credit quality indicator          
Home equity   8,336,318us-gaap_LoansAndLeasesReceivableConsumerHomeEquity
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_HomeEquityMember
/ hban_CreditQualityIndicatorAxis
= hban_CreditRiskProfileByFicoScoreMember
     
Residential mortgage other          
Loan and lease balances by credit quality indicator          
Residential mortgage 5,828,697us-gaap_LoansAndLeasesReceivableConsumerMortgage
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_ResidentialMortgageOtherMember
5,318,590us-gaap_LoansAndLeasesReceivableConsumerMortgage
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_ResidentialMortgageOtherMember
     
Residential mortgage other | 750+[Member]          
Loan and lease balances by credit quality indicator          
Residential mortgage 3,285,310us-gaap_LoansAndLeasesReceivableConsumerMortgage
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_ResidentialMortgageOtherMember
/ hban_CreditQualityIndicatorAxis
= hban_CreditRiskProfileByFicoScoreOneMember
2,837,590us-gaap_LoansAndLeasesReceivableConsumerMortgage
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_ResidentialMortgageOtherMember
/ hban_CreditQualityIndicatorAxis
= hban_CreditRiskProfileByFicoScoreOneMember
     
Residential mortgage other | 650-749 [Member]          
Loan and lease balances by credit quality indicator          
Residential mortgage 1,785,137us-gaap_LoansAndLeasesReceivableConsumerMortgage
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_ResidentialMortgageOtherMember
/ hban_CreditQualityIndicatorAxis
= hban_CreditRiskProfileByFicoScoreTwoMember
1,710,183us-gaap_LoansAndLeasesReceivableConsumerMortgage
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_ResidentialMortgageOtherMember
/ hban_CreditQualityIndicatorAxis
= hban_CreditRiskProfileByFicoScoreTwoMember
     
Residential mortgage other | Less than 650 [Member]          
Loan and lease balances by credit quality indicator          
Residential mortgage 666,562us-gaap_LoansAndLeasesReceivableConsumerMortgage
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_ResidentialMortgageOtherMember
/ hban_CreditQualityIndicatorAxis
= hban_CreditRiskProfileByFicoScoreThreeMember
699,541us-gaap_LoansAndLeasesReceivableConsumerMortgage
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_ResidentialMortgageOtherMember
/ hban_CreditQualityIndicatorAxis
= hban_CreditRiskProfileByFicoScoreThreeMember
     
Residential mortgage other | Other (2) [Member]          
Loan and lease balances by credit quality indicator          
Residential mortgage 91,688us-gaap_LoansAndLeasesReceivableConsumerMortgage
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_ResidentialMortgageOtherMember
/ hban_CreditQualityIndicatorAxis
= hban_CreditRiskProfileByFicoScoreFourMember
71,276us-gaap_LoansAndLeasesReceivableConsumerMortgage
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_ResidentialMortgageOtherMember
/ hban_CreditQualityIndicatorAxis
= hban_CreditRiskProfileByFicoScoreFourMember
     
Residential mortgage purchased impaired          
Loan and lease balances by credit quality indicator          
Residential mortgage 1,912us-gaap_LoansAndLeasesReceivableConsumerMortgage
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_ResidentialMortgagePurchasedImpairedMember
       
Residential mortgage purchased impaired | 750+[Member]          
Loan and lease balances by credit quality indicator          
Residential mortgage 594us-gaap_LoansAndLeasesReceivableConsumerMortgage
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_ResidentialMortgagePurchasedImpairedMember
/ hban_CreditQualityIndicatorAxis
= hban_CreditRiskProfileByFicoScoreOneMember
588us-gaap_LoansAndLeasesReceivableConsumerMortgage
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_ResidentialMortgagePurchasedImpairedMember
/ hban_CreditQualityIndicatorAxis
= hban_CreditRiskProfileByFicoScoreOneMember
     
Residential mortgage purchased impaired | 650-749 [Member]          
Loan and lease balances by credit quality indicator          
Residential mortgage 1,135us-gaap_LoansAndLeasesReceivableConsumerMortgage
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_ResidentialMortgagePurchasedImpairedMember
/ hban_CreditQualityIndicatorAxis
= hban_CreditRiskProfileByFicoScoreTwoMember
989us-gaap_LoansAndLeasesReceivableConsumerMortgage
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_ResidentialMortgagePurchasedImpairedMember
/ hban_CreditQualityIndicatorAxis
= hban_CreditRiskProfileByFicoScoreTwoMember
     
Residential mortgage purchased impaired | Less than 650 [Member]          
Loan and lease balances by credit quality indicator          
Residential mortgage 183us-gaap_LoansAndLeasesReceivableConsumerMortgage
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_ResidentialMortgagePurchasedImpairedMember
/ hban_CreditQualityIndicatorAxis
= hban_CreditRiskProfileByFicoScoreThreeMember
921us-gaap_LoansAndLeasesReceivableConsumerMortgage
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_ResidentialMortgagePurchasedImpairedMember
/ hban_CreditQualityIndicatorAxis
= hban_CreditRiskProfileByFicoScoreThreeMember
     
Residential mortgage purchased impaired | Other (2) [Member]          
Loan and lease balances by credit quality indicator          
Residential mortgage 0us-gaap_LoansAndLeasesReceivableConsumerMortgage
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_ResidentialMortgagePurchasedImpairedMember
/ hban_CreditQualityIndicatorAxis
= hban_CreditRiskProfileByFicoScoreFourMember
0us-gaap_LoansAndLeasesReceivableConsumerMortgage
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_ResidentialMortgagePurchasedImpairedMember
/ hban_CreditQualityIndicatorAxis
= hban_CreditRiskProfileByFicoScoreFourMember
     
Residential mortgage purchased impaired | Total          
Loan and lease balances by credit quality indicator          
Residential mortgage   2,498us-gaap_LoansAndLeasesReceivableConsumerMortgage
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_ResidentialMortgagePurchasedImpairedMember
/ hban_CreditQualityIndicatorAxis
= hban_CreditRiskProfileByFicoScoreMember
     
Residential Mortgage [Member]          
Allowance For Credit Losses Roll Forward [Abstract]          
ALLL balance, beginning of period 39,577us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_ResidentialMortgageMember
  61,658us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_ResidentialMortgageMember
  87,194us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_ResidentialMortgageMember
Recoveries of loans previously charged-off 6,194hban_RecoveriesOfLoansPreviouslyChargedoff
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_ResidentialMortgageMember
7,074hban_RecoveriesOfLoansPreviouslyChargedoff
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_ResidentialMortgageMember
4,305hban_RecoveriesOfLoansPreviouslyChargedoff
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_ResidentialMortgageMember
   
Loan charge-offs (25,946)us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_ResidentialMortgageMember
(34,236)us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_ResidentialMortgageMember
(52,228)us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_ResidentialMortgageMember
   
Provision for loan and lease losses 27,386hban_ProvisionForLoanAndLeaseLosse
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_ResidentialMortgageMember
5,417hban_ProvisionForLoanAndLeaseLosse
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_ResidentialMortgageMember
24,046hban_ProvisionForLoanAndLeaseLosse
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_ResidentialMortgageMember
   
Allowance for loans sold or transferred to hoans held for sale 0hban_AllowanceForLoansSoldOrTransferredToLoansHeldForSale
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_ResidentialMortgageMember
(336)hban_AllowanceForLoansSoldOrTransferredToLoansHeldForSale
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_ResidentialMortgageMember
(1,659)hban_AllowanceForLoansSoldOrTransferredToLoansHeldForSale
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_ResidentialMortgageMember
   
ALLL balance, end of period 47,211us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_ResidentialMortgageMember
39,577us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_ResidentialMortgageMember
    87,194us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_ResidentialMortgageMember
AULC balance, beginning of period 9hban_ULCBalanceBeginningOfPeriod
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_ResidentialMortgageMember
  3hban_ULCBalanceBeginningOfPeriod
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_ResidentialMortgageMember
  1hban_ULCBalanceBeginningOfPeriod
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_ResidentialMortgageMember
Provision for unfunded loan commitments and letters of credit (1)hban_ProvisionForUnfundedLoanCommitmentsAndLettersOfCredit
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_ResidentialMortgageMember
6hban_ProvisionForUnfundedLoanCommitmentsAndLettersOfCredit
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_ResidentialMortgageMember
2hban_ProvisionForUnfundedLoanCommitmentsAndLettersOfCredit
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_ResidentialMortgageMember
   
AULC Balance, end of period 8hban_AulcBalanceEndOfPeriod
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_ResidentialMortgageMember
9hban_AulcBalanceEndOfPeriod
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_ResidentialMortgageMember
  3hban_AulcBalanceEndOfPeriod
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_ResidentialMortgageMember
 
ACL balance, end of period 47,219hban_AclBalanceEndOfPeriod
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_ResidentialMortgageMember
39,586hban_AclBalanceEndOfPeriod
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_ResidentialMortgageMember
  61,661hban_AclBalanceEndOfPeriod
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_ResidentialMortgageMember
 
Residential Mortgage [Member] | 750+[Member]          
Loan and lease balances by credit quality indicator          
Residential mortgage   2,838,178us-gaap_LoansAndLeasesReceivableConsumerMortgage
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_ResidentialMortgageMember
/ hban_CreditQualityIndicatorAxis
= hban_CreditRiskProfileByFicoScoreOneMember
     
Residential Mortgage [Member] | 650-749 [Member]          
Loan and lease balances by credit quality indicator          
Residential mortgage   1,711,172us-gaap_LoansAndLeasesReceivableConsumerMortgage
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_ResidentialMortgageMember
/ hban_CreditQualityIndicatorAxis
= hban_CreditRiskProfileByFicoScoreTwoMember
     
Residential Mortgage [Member] | Less than 650 [Member]          
Loan and lease balances by credit quality indicator          
Residential mortgage   700,462us-gaap_LoansAndLeasesReceivableConsumerMortgage
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_ResidentialMortgageMember
/ hban_CreditQualityIndicatorAxis
= hban_CreditRiskProfileByFicoScoreThreeMember
     
Residential Mortgage [Member] | Other (2) [Member]          
Loan and lease balances by credit quality indicator          
Residential mortgage   71,276us-gaap_LoansAndLeasesReceivableConsumerMortgage
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_ResidentialMortgageMember
/ hban_CreditQualityIndicatorAxis
= hban_CreditRiskProfileByFicoScoreFourMember
     
Residential Mortgage [Member] | Total          
Loan and lease balances by credit quality indicator          
Residential mortgage   5,321,088us-gaap_LoansAndLeasesReceivableConsumerMortgage
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_ResidentialMortgageMember
/ hban_CreditQualityIndicatorAxis
= hban_CreditRiskProfileByFicoScoreMember
     
Other consumer other          
Loan and lease balances by credit quality indicator          
Other consumer 413,700us-gaap_LoansAndLeasesReceivableConsumerOther
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_OtherConsumerOtherMember
379,882us-gaap_LoansAndLeasesReceivableConsumerOther
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_OtherConsumerOtherMember
     
Other consumer other | 750+[Member]          
Loan and lease balances by credit quality indicator          
Other consumer 195,128us-gaap_LoansAndLeasesReceivableConsumerOther
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_OtherConsumerOtherMember
/ hban_CreditQualityIndicatorAxis
= hban_CreditRiskProfileByFicoScoreOneMember
161,858us-gaap_LoansAndLeasesReceivableConsumerOther
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_OtherConsumerOtherMember
/ hban_CreditQualityIndicatorAxis
= hban_CreditRiskProfileByFicoScoreOneMember
     
Other consumer other | 650-749 [Member]          
Loan and lease balances by credit quality indicator          
Other consumer 187,781us-gaap_LoansAndLeasesReceivableConsumerOther
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_OtherConsumerOtherMember
/ hban_CreditQualityIndicatorAxis
= hban_CreditRiskProfileByFicoScoreTwoMember
157,675us-gaap_LoansAndLeasesReceivableConsumerOther
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_OtherConsumerOtherMember
/ hban_CreditQualityIndicatorAxis
= hban_CreditRiskProfileByFicoScoreTwoMember
     
Other consumer other | Less than 650 [Member]          
Loan and lease balances by credit quality indicator          
Other consumer 30,582us-gaap_LoansAndLeasesReceivableConsumerOther
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_OtherConsumerOtherMember
/ hban_CreditQualityIndicatorAxis
= hban_CreditRiskProfileByFicoScoreThreeMember
45,370us-gaap_LoansAndLeasesReceivableConsumerOther
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_OtherConsumerOtherMember
/ hban_CreditQualityIndicatorAxis
= hban_CreditRiskProfileByFicoScoreThreeMember
     
Other consumer other | Other (2) [Member]          
Loan and lease balances by credit quality indicator          
Other consumer 209us-gaap_LoansAndLeasesReceivableConsumerOther
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_OtherConsumerOtherMember
/ hban_CreditQualityIndicatorAxis
= hban_CreditRiskProfileByFicoScoreFourMember
14,979us-gaap_LoansAndLeasesReceivableConsumerOther
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_OtherConsumerOtherMember
/ hban_CreditQualityIndicatorAxis
= hban_CreditRiskProfileByFicoScoreFourMember
     
Other consumer purchased impaired          
Loan and lease balances by credit quality indicator          
Other consumer 51us-gaap_LoansAndLeasesReceivableConsumerOther
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_OtherConsumerPurchasedImpairedMember
       
Other consumer purchased impaired | 750+[Member]          
Loan and lease balances by credit quality indicator          
Other consumer 0us-gaap_LoansAndLeasesReceivableConsumerOther
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_OtherConsumerPurchasedImpairedMember
/ hban_CreditQualityIndicatorAxis
= hban_CreditRiskProfileByFicoScoreOneMember
0us-gaap_LoansAndLeasesReceivableConsumerOther
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_OtherConsumerPurchasedImpairedMember
/ hban_CreditQualityIndicatorAxis
= hban_CreditRiskProfileByFicoScoreOneMember
     
Other consumer purchased impaired | 650-749 [Member]          
Loan and lease balances by credit quality indicator          
Other consumer 51us-gaap_LoansAndLeasesReceivableConsumerOther
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_OtherConsumerPurchasedImpairedMember
/ hban_CreditQualityIndicatorAxis
= hban_CreditRiskProfileByFicoScoreTwoMember
60us-gaap_LoansAndLeasesReceivableConsumerOther
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_OtherConsumerPurchasedImpairedMember
/ hban_CreditQualityIndicatorAxis
= hban_CreditRiskProfileByFicoScoreTwoMember
     
Other consumer purchased impaired | Less than 650 [Member]          
Loan and lease balances by credit quality indicator          
Other consumer 0us-gaap_LoansAndLeasesReceivableConsumerOther
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_OtherConsumerPurchasedImpairedMember
/ hban_CreditQualityIndicatorAxis
= hban_CreditRiskProfileByFicoScoreThreeMember
69us-gaap_LoansAndLeasesReceivableConsumerOther
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_OtherConsumerPurchasedImpairedMember
/ hban_CreditQualityIndicatorAxis
= hban_CreditRiskProfileByFicoScoreThreeMember
     
Other consumer purchased impaired | Other (2) [Member]          
Loan and lease balances by credit quality indicator          
Other consumer 0us-gaap_LoansAndLeasesReceivableConsumerOther
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_OtherConsumerPurchasedImpairedMember
/ hban_CreditQualityIndicatorAxis
= hban_CreditRiskProfileByFicoScoreFourMember
0us-gaap_LoansAndLeasesReceivableConsumerOther
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_OtherConsumerPurchasedImpairedMember
/ hban_CreditQualityIndicatorAxis
= hban_CreditRiskProfileByFicoScoreFourMember
     
Other consumer purchased impaired | Total          
Loan and lease balances by credit quality indicator          
Other consumer   129us-gaap_LoansAndLeasesReceivableConsumerOther
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_OtherConsumerPurchasedImpairedMember
/ hban_CreditQualityIndicatorAxis
= hban_CreditRiskProfileByFicoScoreMember
     
Other Consumer loan [Member]          
Allowance For Credit Losses Roll Forward [Abstract]          
ALLL balance, beginning of period 37,751us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_OtherConsumerLoanMember
  27,254us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_OtherConsumerLoanMember
  31,406us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_OtherConsumerLoanMember
Recoveries of loans previously charged-off 5,890hban_RecoveriesOfLoansPreviouslyChargedoff
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_OtherConsumerLoanMember
7,108hban_RecoveriesOfLoansPreviouslyChargedoff
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_OtherConsumerLoanMember
7,049hban_RecoveriesOfLoansPreviouslyChargedoff
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_OtherConsumerLoanMember
   
Loan charge-offs (33,494)us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_OtherConsumerLoanMember
(34,568)us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_OtherConsumerLoanMember
(33,090)us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_OtherConsumerLoanMember
   
Provision for loan and lease losses 29,254hban_ProvisionForLoanAndLeaseLosse
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_OtherConsumerLoanMember
37,957hban_ProvisionForLoanAndLeaseLosse
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_OtherConsumerLoanMember
21,889hban_ProvisionForLoanAndLeaseLosse
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_OtherConsumerLoanMember
   
Allowance for loans sold or transferred to hoans held for sale (1,129)hban_AllowanceForLoansSoldOrTransferredToLoansHeldForSale
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_OtherConsumerLoanMember
0hban_AllowanceForLoansSoldOrTransferredToLoansHeldForSale
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_OtherConsumerLoanMember
0hban_AllowanceForLoansSoldOrTransferredToLoansHeldForSale
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_OtherConsumerLoanMember
   
ALLL balance, end of period 38,272us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_OtherConsumerLoanMember
37,751us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_OtherConsumerLoanMember
    31,406us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_OtherConsumerLoanMember
AULC balance, beginning of period 1,640hban_ULCBalanceBeginningOfPeriod
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_OtherConsumerLoanMember
  684hban_ULCBalanceBeginningOfPeriod
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_OtherConsumerLoanMember
  811hban_ULCBalanceBeginningOfPeriod
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_OtherConsumerLoanMember
Provision for unfunded loan commitments and letters of credit 2,205hban_ProvisionForUnfundedLoanCommitmentsAndLettersOfCredit
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_OtherConsumerLoanMember
956hban_ProvisionForUnfundedLoanCommitmentsAndLettersOfCredit
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_OtherConsumerLoanMember
(127)hban_ProvisionForUnfundedLoanCommitmentsAndLettersOfCredit
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_OtherConsumerLoanMember
   
AULC Balance, end of period 3,845hban_AulcBalanceEndOfPeriod
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_OtherConsumerLoanMember
1,640hban_AulcBalanceEndOfPeriod
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_OtherConsumerLoanMember
  684hban_AulcBalanceEndOfPeriod
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_OtherConsumerLoanMember
 
ACL balance, end of period 42,117hban_AclBalanceEndOfPeriod
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_OtherConsumerLoanMember
39,391hban_AclBalanceEndOfPeriod
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_OtherConsumerLoanMember
  27,938hban_AclBalanceEndOfPeriod
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_OtherConsumerLoanMember
 
Other Consumer loan [Member] | 750+[Member]          
Loan and lease balances by credit quality indicator          
Other consumer   161,858us-gaap_LoansAndLeasesReceivableConsumerOther
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_OtherConsumerLoanMember
/ hban_CreditQualityIndicatorAxis
= hban_CreditRiskProfileByFicoScoreOneMember
     
Other Consumer loan [Member] | 650-749 [Member]          
Loan and lease balances by credit quality indicator          
Other consumer   157,735us-gaap_LoansAndLeasesReceivableConsumerOther
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_OtherConsumerLoanMember
/ hban_CreditQualityIndicatorAxis
= hban_CreditRiskProfileByFicoScoreTwoMember
     
Other Consumer loan [Member] | Less than 650 [Member]          
Loan and lease balances by credit quality indicator          
Other consumer   45,439us-gaap_LoansAndLeasesReceivableConsumerOther
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_OtherConsumerLoanMember
/ hban_CreditQualityIndicatorAxis
= hban_CreditRiskProfileByFicoScoreThreeMember
     
Other Consumer loan [Member] | Other (2) [Member]          
Loan and lease balances by credit quality indicator          
Other consumer   14,979us-gaap_LoansAndLeasesReceivableConsumerOther
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_OtherConsumerLoanMember
/ hban_CreditQualityIndicatorAxis
= hban_CreditRiskProfileByFicoScoreFourMember
     
Other Consumer loan [Member] | Total          
Loan and lease balances by credit quality indicator          
Other consumer   $ 380,011us-gaap_LoansAndLeasesReceivableConsumerOther
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_OtherConsumerLoanMember
/ hban_CreditQualityIndicatorAxis
= hban_CreditRiskProfileByFicoScoreMember