Quarterly report pursuant to Section 13 or 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 $)
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Allowance For Credit Losses Roll Forward [Abstract]      
ALLL balance, beginning of period $ 605,196,000us-gaap_LoansAndLeasesReceivableAllowance $ 647,870,000us-gaap_LoansAndLeasesReceivableAllowance  
Recoveries of loans previously charged-off 30,643,000hban_RecoveriesOfLoansPreviouslyChargedoff 30,025,000hban_RecoveriesOfLoansPreviouslyChargedoff  
Loan charge-offs (55,075,000)us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs (73,011,000)us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs  
Provision for loan and lease losses 26,655,000hban_ProvisionForLoanAndLeaseLosse 28,161,000hban_ProvisionForLoanAndLeaseLosse  
Allowance for loans sold or transferred to hoans held for sale (2,293,000)hban_AllowanceForLoansSoldOrTransferredToLoansHeldForSale (1,127,000)hban_AllowanceForLoansSoldOrTransferredToLoansHeldForSale  
ALLL balance, end of period 605,126,000us-gaap_LoansAndLeasesReceivableAllowance 631,918,000us-gaap_LoansAndLeasesReceivableAllowance  
AULC balance, beginning of period 60,806,000hban_ULCBalanceBeginningOfPeriod 62,899,000hban_ULCBalanceBeginningOfPeriod  
Provision for unfunded loan commitments and letters of credit (6,064,000)hban_ProvisionForUnfundedLoanCommitmentsAndLettersOfCredit (3,531,000)hban_ProvisionForUnfundedLoanCommitmentsAndLettersOfCredit  
AULC Balance, end of period 54,742,000hban_AulcBalanceEndOfPeriod 59,368,000hban_AulcBalanceEndOfPeriod  
ACL balance, end of period 659,868,000hban_AclBalanceEndOfPeriod 691,286,000hban_AclBalanceEndOfPeriod  
Loan and lease balances by credit quality indicator      
Total commercial and industrial 20,108,742,000us-gaap_LoansReceivableCommercialAndIndustrial   19,033,146,000us-gaap_LoansReceivableCommercialAndIndustrial
Total commercial real estate 5,067,024,000us-gaap_LoansReceivableCommercialRealEstate   5,197,403,000us-gaap_LoansReceivableCommercialRealEstate
Automobile 7,802,542,000hban_LoansAndLeasesReceivableAutomobile   8,689,902,000hban_LoansAndLeasesReceivableAutomobile
Home equity 8,492,460,000us-gaap_LoansAndLeasesReceivableConsumerHomeEquity   8,490,915,000us-gaap_LoansAndLeasesReceivableConsumerHomeEquity
Residential mortgage 5,794,707,000us-gaap_LoansAndLeasesReceivableConsumerMortgage   5,830,609,000us-gaap_LoansAndLeasesReceivableConsumerMortgage
Other consumer 430,157,000us-gaap_LoansAndLeasesReceivableConsumerOther   413,751,000us-gaap_LoansAndLeasesReceivableConsumerOther
Automobile loans including automobile loans transferred to loans held for sale 7,802,542,000hban_AutomobileLoansIncludingHFSSecuritization    
Pass [Member]      
Loan and lease balances by credit quality indicator      
Total commercial and industrial 18,904,282,000us-gaap_LoansReceivableCommercialAndIndustrial
/ hban_CreditQualityIndicatorAxis
= us-gaap_PassMember
  17,888,295,000us-gaap_LoansReceivableCommercialAndIndustrial
/ hban_CreditQualityIndicatorAxis
= us-gaap_PassMember
Total commercial real estate 4,761,269,000us-gaap_LoansReceivableCommercialRealEstate
/ hban_CreditQualityIndicatorAxis
= us-gaap_PassMember
  4,886,720,000us-gaap_LoansReceivableCommercialRealEstate
/ hban_CreditQualityIndicatorAxis
= us-gaap_PassMember
OLEM [Member]      
Loan and lease balances by credit quality indicator      
Total commercial and industrial 499,114,000us-gaap_LoansReceivableCommercialAndIndustrial
/ hban_CreditQualityIndicatorAxis
= us-gaap_SpecialMentionMember
  505,044,000us-gaap_LoansReceivableCommercialAndIndustrial
/ hban_CreditQualityIndicatorAxis
= us-gaap_SpecialMentionMember
Total commercial real estate 78,998,000us-gaap_LoansReceivableCommercialRealEstate
/ hban_CreditQualityIndicatorAxis
= us-gaap_SpecialMentionMember
  74,234,000us-gaap_LoansReceivableCommercialRealEstate
/ hban_CreditQualityIndicatorAxis
= us-gaap_SpecialMentionMember
Substandard [Member]      
Loan and lease balances by credit quality indicator      
Total commercial and industrial 699,947,000us-gaap_LoansReceivableCommercialAndIndustrial
/ hban_CreditQualityIndicatorAxis
= us-gaap_SubstandardMember
  630,704,000us-gaap_LoansReceivableCommercialAndIndustrial
/ hban_CreditQualityIndicatorAxis
= us-gaap_SubstandardMember
Total commercial real estate 219,530,000us-gaap_LoansReceivableCommercialRealEstate
/ hban_CreditQualityIndicatorAxis
= us-gaap_SubstandardMember
  226,071,000us-gaap_LoansReceivableCommercialRealEstate
/ hban_CreditQualityIndicatorAxis
= us-gaap_SubstandardMember
Doubtful [Member]      
Loan and lease balances by credit quality indicator      
Total commercial and industrial 5,399,000us-gaap_LoansReceivableCommercialAndIndustrial
/ hban_CreditQualityIndicatorAxis
= us-gaap_DoubtfulMember
  9,103,000us-gaap_LoansReceivableCommercialAndIndustrial
/ hban_CreditQualityIndicatorAxis
= us-gaap_DoubtfulMember
Total commercial real estate 7,227,000us-gaap_LoansReceivableCommercialRealEstate
/ hban_CreditQualityIndicatorAxis
= us-gaap_DoubtfulMember
  10,378,000us-gaap_LoansReceivableCommercialRealEstate
/ hban_CreditQualityIndicatorAxis
= us-gaap_DoubtfulMember
750+[Member]      
Loan and lease balances by credit quality indicator      
Home equity 5,148,737,000us-gaap_LoansAndLeasesReceivableConsumerHomeEquity
/ hban_CreditQualityIndicatorAxis
= hban_CreditRiskProfileByFicoScoreOneMember
   
Residential mortgage 3,369,123,000us-gaap_LoansAndLeasesReceivableConsumerMortgage
/ hban_CreditQualityIndicatorAxis
= hban_CreditRiskProfileByFicoScoreOneMember
   
Other consumer 196,239,000us-gaap_LoansAndLeasesReceivableConsumerOther
/ hban_CreditQualityIndicatorAxis
= hban_CreditRiskProfileByFicoScoreOneMember
   
Automobile loans including automobile loans transferred to loans held for sale 3,535,817,000hban_AutomobileLoansIncludingHFSSecuritization
/ hban_CreditQualityIndicatorAxis
= hban_CreditRiskProfileByFicoScoreOneMember
   
650-749 [Member]      
Loan and lease balances by credit quality indicator      
Home equity 2,553,344,000us-gaap_LoansAndLeasesReceivableConsumerHomeEquity
/ hban_CreditQualityIndicatorAxis
= hban_CreditRiskProfileByFicoScoreTwoMember
   
Residential mortgage 1,741,554,000us-gaap_LoansAndLeasesReceivableConsumerMortgage
/ hban_CreditQualityIndicatorAxis
= hban_CreditRiskProfileByFicoScoreTwoMember
   
Other consumer 196,153,000us-gaap_LoansAndLeasesReceivableConsumerOther
/ hban_CreditQualityIndicatorAxis
= hban_CreditRiskProfileByFicoScoreTwoMember
   
Automobile loans including automobile loans transferred to loans held for sale 2,985,426,000hban_AutomobileLoansIncludingHFSSecuritization
/ hban_CreditQualityIndicatorAxis
= hban_CreditRiskProfileByFicoScoreTwoMember
   
Less than 650 [Member]      
Loan and lease balances by credit quality indicator      
Home equity 655,081,000us-gaap_LoansAndLeasesReceivableConsumerHomeEquity
/ hban_CreditQualityIndicatorAxis
= hban_CreditRiskProfileByFicoScoreThreeMember
   
Residential mortgage 639,945,000us-gaap_LoansAndLeasesReceivableConsumerMortgage
/ hban_CreditQualityIndicatorAxis
= hban_CreditRiskProfileByFicoScoreThreeMember
   
Other consumer 29,047,000us-gaap_LoansAndLeasesReceivableConsumerOther
/ hban_CreditQualityIndicatorAxis
= hban_CreditRiskProfileByFicoScoreThreeMember
   
Automobile loans including automobile loans transferred to loans held for sale 1,062,789,000hban_AutomobileLoansIncludingHFSSecuritization
/ hban_CreditQualityIndicatorAxis
= hban_CreditRiskProfileByFicoScoreThreeMember
   
Other (2) [Member]      
Loan and lease balances by credit quality indicator      
Home equity 135,298,000us-gaap_LoansAndLeasesReceivableConsumerHomeEquity
/ hban_CreditQualityIndicatorAxis
= hban_CreditRiskProfileByFicoScoreFourMember
   
Residential mortgage 44,085,000us-gaap_LoansAndLeasesReceivableConsumerMortgage
/ hban_CreditQualityIndicatorAxis
= hban_CreditRiskProfileByFicoScoreFourMember
   
Other consumer 8,718,000us-gaap_LoansAndLeasesReceivableConsumerOther
/ hban_CreditQualityIndicatorAxis
= hban_CreditRiskProfileByFicoScoreFourMember
   
Automobile loans including automobile loans transferred to loans held for sale 218,510,000hban_AutomobileLoansIncludingHFSSecuritization
/ hban_CreditQualityIndicatorAxis
= hban_CreditRiskProfileByFicoScoreFourMember
   
Commercial and industrial owner occupied [Member]      
Loan and lease balances by credit quality indicator      
Total commercial and industrial 4,189,903,000us-gaap_LoansReceivableCommercialAndIndustrial
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_CommercialAndIndustrialOwnerOccupiedMember
  4,254,875,000us-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 3,863,529,000us-gaap_LoansReceivableCommercialAndIndustrial
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_CommercialAndIndustrialOwnerOccupiedMember
/ hban_CreditQualityIndicatorAxis
= us-gaap_PassMember
  3,959,046,000us-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 140,076,000us-gaap_LoansReceivableCommercialAndIndustrial
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_CommercialAndIndustrialOwnerOccupiedMember
/ hban_CreditQualityIndicatorAxis
= us-gaap_SpecialMentionMember
  117,637,000us-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 183,947,000us-gaap_LoansReceivableCommercialAndIndustrial
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_CommercialAndIndustrialOwnerOccupiedMember
/ hban_CreditQualityIndicatorAxis
= us-gaap_SubstandardMember
  175,767,000us-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 2,351,000us-gaap_LoansReceivableCommercialAndIndustrial
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_CommercialAndIndustrialOwnerOccupiedMember
/ hban_CreditQualityIndicatorAxis
= us-gaap_DoubtfulMember
  2,425,000us-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 21,378,000us-gaap_LoansReceivableCommercialAndIndustrial
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_CommercialAndIndustrialPurchasedImpairedMember
  23,228,000us-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 3,863,000us-gaap_LoansReceivableCommercialAndIndustrial
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_CommercialAndIndustrialPurchasedImpairedMember
/ hban_CreditQualityIndicatorAxis
= us-gaap_PassMember
  3,915,000us-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 679,000us-gaap_LoansReceivableCommercialAndIndustrial
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_CommercialAndIndustrialPurchasedImpairedMember
/ hban_CreditQualityIndicatorAxis
= us-gaap_SpecialMentionMember
  741,000us-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 16,646,000us-gaap_LoansReceivableCommercialAndIndustrial
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_CommercialAndIndustrialPurchasedImpairedMember
/ hban_CreditQualityIndicatorAxis
= us-gaap_SubstandardMember
  14,901,000us-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 190,000us-gaap_LoansReceivableCommercialAndIndustrial
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_CommercialAndIndustrialPurchasedImpairedMember
/ hban_CreditQualityIndicatorAxis
= us-gaap_DoubtfulMember
  3,671,000us-gaap_LoansReceivableCommercialAndIndustrial
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_CommercialAndIndustrialPurchasedImpairedMember
/ hban_CreditQualityIndicatorAxis
= us-gaap_DoubtfulMember
Other commercial and industrial [Member]      
Loan and lease balances by credit quality indicator      
Total commercial and industrial 15,897,461,000us-gaap_LoansReceivableCommercialAndIndustrial
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_CommercialAndIndustrialOtherMember
  14,755,043,000us-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 15,036,890,000us-gaap_LoansReceivableCommercialAndIndustrial
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_CommercialAndIndustrialOtherMember
/ hban_CreditQualityIndicatorAxis
= us-gaap_PassMember
  13,925,334,000us-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 358,359,000us-gaap_LoansReceivableCommercialAndIndustrial
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_CommercialAndIndustrialOtherMember
/ hban_CreditQualityIndicatorAxis
= us-gaap_SpecialMentionMember
  386,666,000us-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 499,354,000us-gaap_LoansReceivableCommercialAndIndustrial
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_CommercialAndIndustrialOtherMember
/ hban_CreditQualityIndicatorAxis
= us-gaap_SubstandardMember
  440,036,000us-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 2,858,000us-gaap_LoansReceivableCommercialAndIndustrial
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_CommercialAndIndustrialOtherMember
/ hban_CreditQualityIndicatorAxis
= us-gaap_DoubtfulMember
  3,007,000us-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 286,995,000us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_CommercialAndIndustrialMember
265,801,000us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_CommercialAndIndustrialMember
 
Recoveries of loans previously charged-off 13,209,000hban_RecoveriesOfLoansPreviouslyChargedoff
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_CommercialAndIndustrialMember
7,731,000hban_RecoveriesOfLoansPreviouslyChargedoff
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_CommercialAndIndustrialMember
 
Loan charge-offs (24,612,000)us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_CommercialAndIndustrialMember
(16,337,000)us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_CommercialAndIndustrialMember
 
Provision for loan and lease losses 8,981,000hban_ProvisionForLoanAndLeaseLosse
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_CommercialAndIndustrialMember
9,784,000hban_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
 
ALLL balance, end of period 284,573,000us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_CommercialAndIndustrialMember
266,979,000us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_CommercialAndIndustrialMember
 
AULC balance, beginning of period 48,988,000hban_ULCBalanceBeginningOfPeriod
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_CommercialAndIndustrialMember
49,596,000hban_ULCBalanceBeginningOfPeriod
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_CommercialAndIndustrialMember
 
Provision for unfunded loan commitments and letters of credit (6,673,000)hban_ProvisionForUnfundedLoanCommitmentsAndLettersOfCredit
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_CommercialAndIndustrialMember
(3,280,000)hban_ProvisionForUnfundedLoanCommitmentsAndLettersOfCredit
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_CommercialAndIndustrialMember
 
AULC Balance, end of period 42,315,000hban_AulcBalanceEndOfPeriod
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_CommercialAndIndustrialMember
46,316,000hban_AulcBalanceEndOfPeriod
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_CommercialAndIndustrialMember
 
ACL balance, end of period 326,888,000hban_AclBalanceEndOfPeriod
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_CommercialAndIndustrialMember
313,295,000hban_AclBalanceEndOfPeriod
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_CommercialAndIndustrialMember
 
Commercial real estate retail properties [Member]      
Loan and lease balances by credit quality indicator      
Total commercial real estate 1,355,894,000us-gaap_LoansReceivableCommercialRealEstate
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_CommercialRealEstateRetailPropertiesMember
  1,357,746,000us-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 1,282,684,000us-gaap_LoansReceivableCommercialRealEstate
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_CommercialRealEstateRetailPropertiesMember
/ hban_CreditQualityIndicatorAxis
= us-gaap_PassMember
  1,279,064,000us-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 8,824,000us-gaap_LoansReceivableCommercialRealEstate
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_CommercialRealEstateRetailPropertiesMember
/ hban_CreditQualityIndicatorAxis
= us-gaap_SpecialMentionMember
  10,204,000us-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 63,828,000us-gaap_LoansReceivableCommercialRealEstate
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_CommercialRealEstateRetailPropertiesMember
/ hban_CreditQualityIndicatorAxis
= us-gaap_SubstandardMember
  67,911,000us-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 558,000us-gaap_LoansReceivableCommercialRealEstate
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_CommercialRealEstateRetailPropertiesMember
/ hban_CreditQualityIndicatorAxis
= us-gaap_DoubtfulMember
  567,000us-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 1,029,713,000us-gaap_LoansReceivableCommercialRealEstate
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_CommercialRealEstateMultiFamilyMember
  1,090,416,000us-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 987,543,000us-gaap_LoansReceivableCommercialRealEstate
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_CommercialRealEstateMultiFamilyMember
/ hban_CreditQualityIndicatorAxis
= us-gaap_PassMember
  1,044,521,000us-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 11,143,000us-gaap_LoansReceivableCommercialRealEstate
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_CommercialRealEstateMultiFamilyMember
/ hban_CreditQualityIndicatorAxis
= us-gaap_SpecialMentionMember
  12,608,000us-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 29,525,000us-gaap_LoansReceivableCommercialRealEstate
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_CommercialRealEstateMultiFamilyMember
/ hban_CreditQualityIndicatorAxis
= us-gaap_SubstandardMember
  32,322,000us-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 1,502,000us-gaap_LoansReceivableCommercialRealEstate
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_CommercialRealEstateMultiFamilyMember
/ hban_CreditQualityIndicatorAxis
= us-gaap_DoubtfulMember
  965,000us-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 948,413,000us-gaap_LoansReceivableCommercialRealEstate
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_CommercialRealEstateOfficeMember
  980,303,000us-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 847,635,000us-gaap_LoansReceivableCommercialRealEstate
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_CommercialRealEstateOfficeMember
/ hban_CreditQualityIndicatorAxis
= us-gaap_PassMember
  902,474,000us-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 50,513,000us-gaap_LoansReceivableCommercialRealEstate
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_CommercialRealEstateOfficeMember
/ hban_CreditQualityIndicatorAxis
= us-gaap_SpecialMentionMember
  33,107,000us-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 48,210,000us-gaap_LoansReceivableCommercialRealEstate
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_CommercialRealEstateOfficeMember
/ hban_CreditQualityIndicatorAxis
= us-gaap_SubstandardMember
  42,578,000us-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 2,055,000us-gaap_LoansReceivableCommercialRealEstate
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_CommercialRealEstateOfficeMember
/ hban_CreditQualityIndicatorAxis
= us-gaap_DoubtfulMember
  2,144,000us-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 515,221,000us-gaap_LoansReceivableCommercialRealEstate
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_CommercialRealEstateIndustrialAndWarehouseMember
  513,401,000us-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 498,941,000us-gaap_LoansReceivableCommercialRealEstate
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_CommercialRealEstateIndustrialAndWarehouseMember
/ hban_CreditQualityIndicatorAxis
= us-gaap_PassMember
  487,454,000us-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 277,000us-gaap_LoansReceivableCommercialRealEstate
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_CommercialRealEstateIndustrialAndWarehouseMember
/ hban_CreditQualityIndicatorAxis
= us-gaap_SpecialMentionMember
  7,877,000us-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 15,720,000us-gaap_LoansReceivableCommercialRealEstate
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_CommercialRealEstateIndustrialAndWarehouseMember
/ hban_CreditQualityIndicatorAxis
= us-gaap_SubstandardMember
  17,781,000us-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 283,000us-gaap_LoansReceivableCommercialRealEstate
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_CommercialRealEstateIndustrialAndWarehouseMember
/ hban_CreditQualityIndicatorAxis
= us-gaap_DoubtfulMember
  289,000us-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 35,344,000us-gaap_LoansReceivableCommercialRealEstate
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_CommercialRealEstatePurchasedImpairedMember
  38,371,000us-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 6,404,000us-gaap_LoansReceivableCommercialRealEstate
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_CommercialRealEstatePurchasedImpairedMember
/ hban_CreditQualityIndicatorAxis
= us-gaap_PassMember
  6,914,000us-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 854,000us-gaap_LoansReceivableCommercialRealEstate
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_CommercialRealEstatePurchasedImpairedMember
/ hban_CreditQualityIndicatorAxis
= us-gaap_SpecialMentionMember
  803,000us-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 26,291,000us-gaap_LoansReceivableCommercialRealEstate
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_CommercialRealEstatePurchasedImpairedMember
/ hban_CreditQualityIndicatorAxis
= us-gaap_SubstandardMember
  25,460,000us-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 1,795,000us-gaap_LoansReceivableCommercialRealEstate
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_CommercialRealEstatePurchasedImpairedMember
/ hban_CreditQualityIndicatorAxis
= us-gaap_DoubtfulMember
  5,194,000us-gaap_LoansReceivableCommercialRealEstate
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_CommercialRealEstatePurchasedImpairedMember
/ hban_CreditQualityIndicatorAxis
= us-gaap_DoubtfulMember
Other commercial real estate [Member]      
Loan and lease balances by credit quality indicator      
Total commercial real estate 1,182,439,000us-gaap_LoansReceivableCommercialRealEstate
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_CommercialRealEstateOtherMember
  1,217,166,000us-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 1,138,062,000us-gaap_LoansReceivableCommercialRealEstate
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_CommercialRealEstateOtherMember
/ hban_CreditQualityIndicatorAxis
= us-gaap_PassMember
  1,166,293,000us-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 7,387,000us-gaap_LoansReceivableCommercialRealEstate
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_CommercialRealEstateOtherMember
/ hban_CreditQualityIndicatorAxis
= us-gaap_SpecialMentionMember
  9,635,000us-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 35,956,000us-gaap_LoansReceivableCommercialRealEstate
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_CommercialRealEstateOtherMember
/ hban_CreditQualityIndicatorAxis
= us-gaap_SubstandardMember
  40,019,000us-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 1,034,000us-gaap_LoansReceivableCommercialRealEstate
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_CommercialRealEstateOtherMember
/ hban_CreditQualityIndicatorAxis
= us-gaap_DoubtfulMember
  1,219,000us-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 102,839,000us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialRealEstateMember
162,557,000us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialRealEstateMember
 
Recoveries of loans previously charged-off 6,025,000hban_RecoveriesOfLoansPreviouslyChargedoff
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialRealEstateMember
11,097,000hban_RecoveriesOfLoansPreviouslyChargedoff
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialRealEstateMember
 
Loan charge-offs (2,013,000)us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialRealEstateMember
(10,110,000)us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialRealEstateMember
 
Provision for loan and lease losses (6,099,000)hban_ProvisionForLoanAndLeaseLosse
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialRealEstateMember
(3,238,000)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
 
ALLL balance, end of period 100,752,000us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialRealEstateMember
160,306,000us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialRealEstateMember
 
AULC balance, beginning of period 6,041,000hban_ULCBalanceBeginningOfPeriod
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialRealEstateMember
9,891,000hban_ULCBalanceBeginningOfPeriod
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialRealEstateMember
 
Provision for unfunded loan commitments and letters of credit (510,000)hban_ProvisionForUnfundedLoanCommitmentsAndLettersOfCredit
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialRealEstateMember
(764,000)hban_ProvisionForUnfundedLoanCommitmentsAndLettersOfCredit
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialRealEstateMember
 
AULC Balance, end of period 5,531,000hban_AulcBalanceEndOfPeriod
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialRealEstateMember
9,127,000hban_AulcBalanceEndOfPeriod
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialRealEstateMember
 
ACL balance, end of period 106,283,000hban_AclBalanceEndOfPeriod
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialRealEstateMember
169,433,000hban_AclBalanceEndOfPeriod
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialRealEstateMember
 
Automobile Loan [Member]      
Allowance For Credit Losses Roll Forward [Abstract]      
ALLL balance, beginning of period 33,466,000us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_AutomobileLoanMember
31,053,000us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_AutomobileLoanMember
 
Recoveries of loans previously charged-off 3,855,000hban_RecoveriesOfLoansPreviouslyChargedoff
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_AutomobileLoanMember
3,402,000hban_RecoveriesOfLoansPreviouslyChargedoff
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_AutomobileLoanMember
 
Loan charge-offs (8,103,000)us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_AutomobileLoanMember
(8,044,000)us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_AutomobileLoanMember
 
Provision for loan and lease losses 10,200,000hban_ProvisionForLoanAndLeaseLosse
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_AutomobileLoanMember
(1,233,000)hban_ProvisionForLoanAndLeaseLosse
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_AutomobileLoanMember
 
Allowance for loans sold or transferred to hoans held for sale (2,293,000)hban_AllowanceForLoansSoldOrTransferredToLoansHeldForSale
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_AutomobileLoanMember
0hban_AllowanceForLoansSoldOrTransferredToLoansHeldForSale
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_AutomobileLoanMember
 
ALLL balance, end of period 37,125,000us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_AutomobileLoanMember
25,178,000us-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
 
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
 
AULC Balance, end of period 0hban_AulcBalanceEndOfPeriod
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_AutomobileLoanMember
0hban_AulcBalanceEndOfPeriod
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_AutomobileLoanMember
 
ACL balance, end of period 37,125,000hban_AclBalanceEndOfPeriod
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_AutomobileLoanMember
25,178,000hban_AclBalanceEndOfPeriod
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_AutomobileLoanMember
 
Automobile Loan [Member] | 750+[Member]      
Loan and lease balances by credit quality indicator      
Automobile loans including automobile loans transferred to loans held for sale     4,165,811,000hban_AutomobileLoansIncludingHFSSecuritization
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_AutomobileLoanMember
/ hban_CreditQualityIndicatorAxis
= hban_CreditRiskProfileByFicoScoreOneMember
Automobile Loan [Member] | 650-749 [Member]      
Loan and lease balances by credit quality indicator      
Automobile loans including automobile loans transferred to loans held for sale     3,249,141,000hban_AutomobileLoansIncludingHFSSecuritization
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_AutomobileLoanMember
/ hban_CreditQualityIndicatorAxis
= hban_CreditRiskProfileByFicoScoreTwoMember
Automobile Loan [Member] | Less than 650 [Member]      
Loan and lease balances by credit quality indicator      
Automobile loans including automobile loans transferred to loans held for sale     1,028,381,000hban_AutomobileLoansIncludingHFSSecuritization
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_AutomobileLoanMember
/ hban_CreditQualityIndicatorAxis
= hban_CreditRiskProfileByFicoScoreThreeMember
Automobile Loan [Member] | Other (2) [Member]      
Loan and lease balances by credit quality indicator      
Automobile loans including automobile loans transferred to loans held for sale     246,569,000hban_AutomobileLoansIncludingHFSSecuritization
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_AutomobileLoanMember
/ hban_CreditQualityIndicatorAxis
= hban_CreditRiskProfileByFicoScoreFourMember
Automobile Loan [Member] | Total      
Loan and lease balances by credit quality indicator      
Automobile loans including automobile loans transferred to loans held for sale     8,689,902,000hban_AutomobileLoansIncludingHFSSecuritization
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_AutomobileLoanMember
/ hban_CreditQualityIndicatorAxis
= hban_CreditRiskProfileByFicoScoreMember
Home equity secured by first-lien other [Member]      
Loan and lease balances by credit quality indicator      
Home equity 5,154,737,000us-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 3,314,292,000us-gaap_LoansAndLeasesReceivableConsumerHomeEquity
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_HomeEquitySecuredByFirstLienOtherMember
/ hban_CreditQualityIndicatorAxis
= hban_CreditRiskProfileByFicoScoreOneMember
  3,255,088,000us-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 1,461,774,000us-gaap_LoansAndLeasesReceivableConsumerHomeEquity
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_HomeEquitySecuredByFirstLienOtherMember
/ hban_CreditQualityIndicatorAxis
= hban_CreditRiskProfileByFicoScoreTwoMember
  1,426,191,000us-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 290,562,000us-gaap_LoansAndLeasesReceivableConsumerHomeEquity
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_HomeEquitySecuredByFirstLienOtherMember
/ hban_CreditQualityIndicatorAxis
= hban_CreditRiskProfileByFicoScoreThreeMember
  283,152,000us-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 88,109,000us-gaap_LoansAndLeasesReceivableConsumerHomeEquity
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_HomeEquitySecuredByFirstLienOtherMember
/ hban_CreditQualityIndicatorAxis
= hban_CreditRiskProfileByFicoScoreFourMember
  164,373,000us-gaap_LoansAndLeasesReceivableConsumerHomeEquity
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_HomeEquitySecuredByFirstLienOtherMember
/ hban_CreditQualityIndicatorAxis
= hban_CreditRiskProfileByFicoScoreFourMember
Home equity secured by first-lien other [Member] | Total      
Loan and lease balances by credit quality indicator      
Home equity     5,128,804,000us-gaap_LoansAndLeasesReceivableConsumerHomeEquity
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_HomeEquitySecuredByFirstLienOtherMember
/ hban_CreditQualityIndicatorAxis
= hban_CreditRiskProfileByFicoScoreMember
Home equity secured by junior-lien [Member]      
Loan and lease balances by credit quality indicator      
Home equity 3,337,723,000us-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 1,834,445,000us-gaap_LoansAndLeasesReceivableConsumerHomeEquity
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_HomeEquitySecuredBySecondLienMember
/ hban_CreditQualityIndicatorAxis
= hban_CreditRiskProfileByFicoScoreOneMember
  1,832,663,000us-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 1,091,570,000us-gaap_LoansAndLeasesReceivableConsumerHomeEquity
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_HomeEquitySecuredBySecondLienMember
/ hban_CreditQualityIndicatorAxis
= hban_CreditRiskProfileByFicoScoreTwoMember
  1,095,332,000us-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 364,519,000us-gaap_LoansAndLeasesReceivableConsumerHomeEquity
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_HomeEquitySecuredBySecondLienMember
/ hban_CreditQualityIndicatorAxis
= hban_CreditRiskProfileByFicoScoreThreeMember
  348,825,000us-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 47,189,000us-gaap_LoansAndLeasesReceivableConsumerHomeEquity
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_HomeEquitySecuredBySecondLienMember
/ hban_CreditQualityIndicatorAxis
= hban_CreditRiskProfileByFicoScoreFourMember
  85,291,000us-gaap_LoansAndLeasesReceivableConsumerHomeEquity
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_HomeEquitySecuredBySecondLienMember
/ hban_CreditQualityIndicatorAxis
= hban_CreditRiskProfileByFicoScoreFourMember
Home equity secured by junior-lien [Member] | Total      
Loan and lease balances by credit quality indicator      
Home equity     3,362,111,000us-gaap_LoansAndLeasesReceivableConsumerHomeEquity
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_HomeEquitySecuredBySecondLienMember
/ hban_CreditQualityIndicatorAxis
= hban_CreditRiskProfileByFicoScoreMember
Home Equity [Member]      
Allowance For Credit Losses Roll Forward [Abstract]      
ALLL balance, beginning of period 96,413,000us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_HomeEquityMember
111,131,000us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_HomeEquityMember
 
Recoveries of loans previously charged-off 3,961,000hban_RecoveriesOfLoansPreviouslyChargedoff
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_HomeEquityMember
5,372,000hban_RecoveriesOfLoansPreviouslyChargedoff
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_HomeEquityMember
 
Loan charge-offs (8,586,000)us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_HomeEquityMember
(21,059,000)us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_HomeEquityMember
 
Provision for loan and lease losses 18,492,000hban_ProvisionForLoanAndLeaseLosse
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_HomeEquityMember
17,733,000hban_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
 
ALLL balance, end of period 110,280,000us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_HomeEquityMember
113,177,000us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_HomeEquityMember
 
AULC balance, beginning of period 1,924,000hban_ULCBalanceBeginningOfPeriod
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_HomeEquityMember
1,763,000hban_ULCBalanceBeginningOfPeriod
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_HomeEquityMember
 
Provision for unfunded loan commitments and letters of credit 715,000hban_ProvisionForUnfundedLoanCommitmentsAndLettersOfCredit
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_HomeEquityMember
28,000hban_ProvisionForUnfundedLoanCommitmentsAndLettersOfCredit
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_HomeEquityMember
 
AULC Balance, end of period 2,639,000hban_AulcBalanceEndOfPeriod
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_HomeEquityMember
1,791,000hban_AulcBalanceEndOfPeriod
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_HomeEquityMember
 
ACL balance, end of period 112,919,000hban_AclBalanceEndOfPeriod
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_HomeEquityMember
114,968,000hban_AclBalanceEndOfPeriod
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_HomeEquityMember
 
Home Equity [Member] | 750+[Member]      
Loan and lease balances by credit quality indicator      
Home equity     5,087,751,000us-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     2,521,523,000us-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     631,977,000us-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     249,664,000us-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     8,490,915,000us-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 5,792,539,000us-gaap_LoansAndLeasesReceivableConsumerMortgage
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_ResidentialMortgageOtherMember
   
Residential mortgage other | 750+[Member]      
Loan and lease balances by credit quality indicator      
Residential mortgage 3,368,487,000us-gaap_LoansAndLeasesReceivableConsumerMortgage
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_ResidentialMortgageOtherMember
/ hban_CreditQualityIndicatorAxis
= hban_CreditRiskProfileByFicoScoreOneMember
  3,285,310,000us-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 1,740,335,000us-gaap_LoansAndLeasesReceivableConsumerMortgage
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_ResidentialMortgageOtherMember
/ hban_CreditQualityIndicatorAxis
= hban_CreditRiskProfileByFicoScoreTwoMember
  1,785,137,000us-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 639,632,000us-gaap_LoansAndLeasesReceivableConsumerMortgage
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_ResidentialMortgageOtherMember
/ hban_CreditQualityIndicatorAxis
= hban_CreditRiskProfileByFicoScoreThreeMember
  666,562,000us-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 44,085,000us-gaap_LoansAndLeasesReceivableConsumerMortgage
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_ResidentialMortgageOtherMember
/ hban_CreditQualityIndicatorAxis
= hban_CreditRiskProfileByFicoScoreFourMember
  91,688,000us-gaap_LoansAndLeasesReceivableConsumerMortgage
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_ResidentialMortgageOtherMember
/ hban_CreditQualityIndicatorAxis
= hban_CreditRiskProfileByFicoScoreFourMember
Residential mortgage other | Total      
Loan and lease balances by credit quality indicator      
Residential mortgage     5,828,697,000us-gaap_LoansAndLeasesReceivableConsumerMortgage
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_ResidentialMortgageOtherMember
/ hban_CreditQualityIndicatorAxis
= hban_CreditRiskProfileByFicoScoreMember
Residential mortgage purchased impaired      
Loan and lease balances by credit quality indicator      
Residential mortgage 2,168,000us-gaap_LoansAndLeasesReceivableConsumerMortgage
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_ResidentialMortgagePurchasedImpairedMember
   
Residential mortgage purchased impaired | 750+[Member]      
Loan and lease balances by credit quality indicator      
Residential mortgage 636,000us-gaap_LoansAndLeasesReceivableConsumerMortgage
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_ResidentialMortgagePurchasedImpairedMember
/ hban_CreditQualityIndicatorAxis
= hban_CreditRiskProfileByFicoScoreOneMember
  594,000us-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 1,219,000us-gaap_LoansAndLeasesReceivableConsumerMortgage
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_ResidentialMortgagePurchasedImpairedMember
/ hban_CreditQualityIndicatorAxis
= hban_CreditRiskProfileByFicoScoreTwoMember
  1,135,000us-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 313,000us-gaap_LoansAndLeasesReceivableConsumerMortgage
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_ResidentialMortgagePurchasedImpairedMember
/ hban_CreditQualityIndicatorAxis
= hban_CreditRiskProfileByFicoScoreThreeMember
  183,000us-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     1,912,000us-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 47,211,000us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_ResidentialMortgageMember
39,577,000us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_ResidentialMortgageMember
 
Recoveries of loans previously charged-off 2,047,000hban_RecoveriesOfLoansPreviouslyChargedoff
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_ResidentialMortgageMember
1,127,000hban_RecoveriesOfLoansPreviouslyChargedoff
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_ResidentialMortgageMember
 
Loan charge-offs (4,863,000)us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_ResidentialMortgageMember
(8,986,000)us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_ResidentialMortgageMember
 
Provision for loan and lease losses 10,985,000hban_ProvisionForLoanAndLeaseLosse
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_ResidentialMortgageMember
7,350,000hban_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
0hban_AllowanceForLoansSoldOrTransferredToLoansHeldForSale
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_ResidentialMortgageMember
 
ALLL balance, end of period 55,380,000us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_ResidentialMortgageMember
39,068,000us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_ResidentialMortgageMember
 
AULC balance, beginning of period 8,000hban_ULCBalanceBeginningOfPeriod
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_ResidentialMortgageMember
9,000hban_ULCBalanceBeginningOfPeriod
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_ResidentialMortgageMember
 
Provision for unfunded loan commitments and letters of credit 1,000hban_ProvisionForUnfundedLoanCommitmentsAndLettersOfCredit
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_ResidentialMortgageMember
(1,000)hban_ProvisionForUnfundedLoanCommitmentsAndLettersOfCredit
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_ResidentialMortgageMember
 
AULC Balance, end of period 9,000hban_AulcBalanceEndOfPeriod
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_ResidentialMortgageMember
8,000hban_AulcBalanceEndOfPeriod
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_ResidentialMortgageMember
 
ACL balance, end of period 55,389,000hban_AclBalanceEndOfPeriod
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_ResidentialMortgageMember
39,076,000hban_AclBalanceEndOfPeriod
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_ResidentialMortgageMember
 
Residential Mortgage [Member] | 750+[Member]      
Loan and lease balances by credit quality indicator      
Residential mortgage     3,285,904,000us-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     1,786,272,000us-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     666,745,000us-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     91,688,000us-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     5,830,609,000us-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 430,106,000us-gaap_LoansAndLeasesReceivableConsumerOther
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_OtherConsumerOtherMember
   
Other consumer other | 750+[Member]      
Loan and lease balances by credit quality indicator      
Other consumer 196,239,000us-gaap_LoansAndLeasesReceivableConsumerOther
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_OtherConsumerOtherMember
/ hban_CreditQualityIndicatorAxis
= hban_CreditRiskProfileByFicoScoreOneMember
  195,128,000us-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 196,102,000us-gaap_LoansAndLeasesReceivableConsumerOther
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_OtherConsumerOtherMember
/ hban_CreditQualityIndicatorAxis
= hban_CreditRiskProfileByFicoScoreTwoMember
  187,781,000us-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 29,047,000us-gaap_LoansAndLeasesReceivableConsumerOther
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_OtherConsumerOtherMember
/ hban_CreditQualityIndicatorAxis
= hban_CreditRiskProfileByFicoScoreThreeMember
  30,582,000us-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 8,718,000us-gaap_LoansAndLeasesReceivableConsumerOther
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_OtherConsumerOtherMember
/ hban_CreditQualityIndicatorAxis
= hban_CreditRiskProfileByFicoScoreFourMember
  209,000us-gaap_LoansAndLeasesReceivableConsumerOther
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_OtherConsumerOtherMember
/ hban_CreditQualityIndicatorAxis
= hban_CreditRiskProfileByFicoScoreFourMember
Other consumer other | Total      
Loan and lease balances by credit quality indicator      
Other consumer     413,700,000us-gaap_LoansAndLeasesReceivableConsumerOther
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_OtherConsumerOtherMember
/ hban_CreditQualityIndicatorAxis
= hban_CreditRiskProfileByFicoScoreMember
Other consumer purchased impaired      
Loan and lease balances by credit quality indicator      
Other consumer 51,000us-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 51,000us-gaap_LoansAndLeasesReceivableConsumerOther
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_OtherConsumerPurchasedImpairedMember
/ hban_CreditQualityIndicatorAxis
= hban_CreditRiskProfileByFicoScoreTwoMember
  51,000us-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
  0us-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     51,000us-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 38,272,000us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_OtherConsumerLoanMember
37,751,000us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_OtherConsumerLoanMember
 
Recoveries of loans previously charged-off 1,546,000hban_RecoveriesOfLoansPreviouslyChargedoff
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_OtherConsumerLoanMember
1,296,000hban_RecoveriesOfLoansPreviouslyChargedoff
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_OtherConsumerLoanMember
 
Loan charge-offs (6,898,000)us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_OtherConsumerLoanMember
(8,475,000)us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_OtherConsumerLoanMember
 
Provision for loan and lease losses (15,904,000)hban_ProvisionForLoanAndLeaseLosse
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_OtherConsumerLoanMember
(2,235,000)hban_ProvisionForLoanAndLeaseLosse
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_OtherConsumerLoanMember
 
Allowance for loans sold or transferred to hoans held for sale 0hban_AllowanceForLoansSoldOrTransferredToLoansHeldForSale
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_OtherConsumerLoanMember
(1,127,000)hban_AllowanceForLoansSoldOrTransferredToLoansHeldForSale
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_OtherConsumerLoanMember
 
ALLL balance, end of period 17,016,000us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_OtherConsumerLoanMember
27,210,000us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_OtherConsumerLoanMember
 
AULC balance, beginning of period 3,845,000hban_ULCBalanceBeginningOfPeriod
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_OtherConsumerLoanMember
1,640,000hban_ULCBalanceBeginningOfPeriod
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_OtherConsumerLoanMember
 
Provision for unfunded loan commitments and letters of credit 403,000hban_ProvisionForUnfundedLoanCommitmentsAndLettersOfCredit
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_OtherConsumerLoanMember
486,000hban_ProvisionForUnfundedLoanCommitmentsAndLettersOfCredit
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_OtherConsumerLoanMember
 
AULC Balance, end of period 4,248,000hban_AulcBalanceEndOfPeriod
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_OtherConsumerLoanMember
2,126,000hban_AulcBalanceEndOfPeriod
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_OtherConsumerLoanMember
 
ACL balance, end of period 21,264,000hban_AclBalanceEndOfPeriod
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_OtherConsumerLoanMember
29,336,000hban_AclBalanceEndOfPeriod
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_OtherConsumerLoanMember
 
Other Consumer loan [Member] | 750+[Member]      
Loan and lease balances by credit quality indicator      
Other consumer     195,128,000us-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     187,832,000us-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     30,582,000us-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     209,000us-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     $ 413,751,000us-gaap_LoansAndLeasesReceivableConsumerOther
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hban_OtherConsumerLoanMember
/ hban_CreditQualityIndicatorAxis
= hban_CreditRiskProfileByFicoScoreMember