Quarterly report pursuant to Section 13 or 15(d)

Fair Values of Assets and Liabilities (Level 3 rollforward) (Details 1)

v2.4.1.9
Fair Values of Assets and Liabilities (Level 3 rollforward) (Details 1) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
MSRs [Member]    
Rollforward of financial instruments measured on a recurring basis and classified as Level 3    
Balance, beginning of period $ 22,786us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
/ us-gaap_FairValueByAssetClassAxis
= hban_MortgageServicingRightsMember
$ 34,236us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
/ us-gaap_FairValueByAssetClassAxis
= hban_MortgageServicingRightsMember
Total gains/losses:    
Included in earnings 2,331us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1
/ us-gaap_FairValueByAssetClassAxis
= hban_MortgageServicingRightsMember
3,608us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1
/ us-gaap_FairValueByAssetClassAxis
= hban_MortgageServicingRightsMember
Included in OCI 0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss
/ us-gaap_FairValueByAssetClassAxis
= hban_MortgageServicingRightsMember
0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss
/ us-gaap_FairValueByAssetClassAxis
= hban_MortgageServicingRightsMember
Purchases 0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases
/ us-gaap_FairValueByAssetClassAxis
= hban_MortgageServicingRightsMember
0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases
/ us-gaap_FairValueByAssetClassAxis
= hban_MortgageServicingRightsMember
Sales 0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales
/ us-gaap_FairValueByAssetClassAxis
= hban_MortgageServicingRightsMember
0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales
/ us-gaap_FairValueByAssetClassAxis
= hban_MortgageServicingRightsMember
Repayments 0hban_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetRepayments
/ us-gaap_FairValueByAssetClassAxis
= hban_MortgageServicingRightsMember
0hban_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetRepayments
/ us-gaap_FairValueByAssetClassAxis
= hban_MortgageServicingRightsMember
Issuances 0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetIssues
/ us-gaap_FairValueByAssetClassAxis
= hban_MortgageServicingRightsMember
0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetIssues
/ us-gaap_FairValueByAssetClassAxis
= hban_MortgageServicingRightsMember
Settlements 0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements
/ us-gaap_FairValueByAssetClassAxis
= hban_MortgageServicingRightsMember
0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements
/ us-gaap_FairValueByAssetClassAxis
= hban_MortgageServicingRightsMember
Balance, end of period 20,455us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
/ us-gaap_FairValueByAssetClassAxis
= hban_MortgageServicingRightsMember
30,628us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
/ us-gaap_FairValueByAssetClassAxis
= hban_MortgageServicingRightsMember
The amount of total gains or losses for the period included in earnings (or OCI) attributable to the change in unrealized gains or losses relating to assets still held at reporting date (2,331)hban_FairValueMeasuredOnRecurringBasisChangeInUnrealizedGainLossIncludedInEarnings
/ us-gaap_FairValueByAssetClassAxis
= hban_MortgageServicingRightsMember
(3,608)hban_FairValueMeasuredOnRecurringBasisChangeInUnrealizedGainLossIncludedInEarnings
/ us-gaap_FairValueByAssetClassAxis
= hban_MortgageServicingRightsMember
Derivative Instruments [Member]    
Rollforward of financial instruments measured on a recurring basis and classified as Level 3    
Balance, beginning of period 3,360us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
/ us-gaap_FairValueByAssetClassAxis
= hban_DerivativeInstrumentsMember
2,390us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
/ us-gaap_FairValueByAssetClassAxis
= hban_DerivativeInstrumentsMember
Total gains/losses:    
Included in earnings (5,001)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1
/ us-gaap_FairValueByAssetClassAxis
= hban_DerivativeInstrumentsMember
(1,675)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1
/ us-gaap_FairValueByAssetClassAxis
= hban_DerivativeInstrumentsMember
Included in OCI 0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss
/ us-gaap_FairValueByAssetClassAxis
= hban_DerivativeInstrumentsMember
0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss
/ us-gaap_FairValueByAssetClassAxis
= hban_DerivativeInstrumentsMember
Purchases 0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases
/ us-gaap_FairValueByAssetClassAxis
= hban_DerivativeInstrumentsMember
0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases
/ us-gaap_FairValueByAssetClassAxis
= hban_DerivativeInstrumentsMember
Sales 0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales
/ us-gaap_FairValueByAssetClassAxis
= hban_DerivativeInstrumentsMember
0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales
/ us-gaap_FairValueByAssetClassAxis
= hban_DerivativeInstrumentsMember
Repayments 0hban_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetRepayments
/ us-gaap_FairValueByAssetClassAxis
= hban_DerivativeInstrumentsMember
0hban_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetRepayments
/ us-gaap_FairValueByAssetClassAxis
= hban_DerivativeInstrumentsMember
Issuances 0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetIssues
/ us-gaap_FairValueByAssetClassAxis
= hban_DerivativeInstrumentsMember
0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetIssues
/ us-gaap_FairValueByAssetClassAxis
= hban_DerivativeInstrumentsMember
Settlements (536)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements
/ us-gaap_FairValueByAssetClassAxis
= hban_DerivativeInstrumentsMember
(365)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements
/ us-gaap_FairValueByAssetClassAxis
= hban_DerivativeInstrumentsMember
Balance, end of period 7,825us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
/ us-gaap_FairValueByAssetClassAxis
= hban_DerivativeInstrumentsMember
3,700us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
/ us-gaap_FairValueByAssetClassAxis
= hban_DerivativeInstrumentsMember
The amount of total gains or losses for the period included in earnings (or OCI) attributable to the change in unrealized gains or losses relating to assets still held at reporting date 4,465hban_FairValueMeasuredOnRecurringBasisChangeInUnrealizedGainLossIncludedInEarnings
/ us-gaap_FairValueByAssetClassAxis
= hban_DerivativeInstrumentsMember
1,675hban_FairValueMeasuredOnRecurringBasisChangeInUnrealizedGainLossIncludedInEarnings
/ us-gaap_FairValueByAssetClassAxis
= hban_DerivativeInstrumentsMember
Municipal securities [Member]    
Rollforward of financial instruments measured on a recurring basis and classified as Level 3    
Balance, beginning of period 1,417,593us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_MunicipalBondsMember
654,537us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_MunicipalBondsMember
Total gains/losses:    
Included in earnings 0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_MunicipalBondsMember
0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_MunicipalBondsMember
Included in OCI 3,992us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_MunicipalBondsMember
(7,272)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_MunicipalBondsMember
Purchases 242,997us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_MunicipalBondsMember
80,185us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_MunicipalBondsMember
Sales 0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_MunicipalBondsMember
0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_MunicipalBondsMember
Repayments 0hban_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetRepayments
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_MunicipalBondsMember
0hban_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetRepayments
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_MunicipalBondsMember
Issuances 0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetIssues
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_MunicipalBondsMember
0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetIssues
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_MunicipalBondsMember
Settlements (20,790)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_MunicipalBondsMember
(7,616)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_MunicipalBondsMember
Balance, end of period 1,635,808us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_MunicipalBondsMember
734,378us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_MunicipalBondsMember
The amount of total gains or losses for the period included in earnings (or OCI) attributable to the change in unrealized gains or losses relating to assets still held at reporting date (3,992)hban_FairValueMeasuredOnRecurringBasisChangeInUnrealizedGainLossIncludedInEarnings
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_MunicipalBondsMember
7,272hban_FairValueMeasuredOnRecurringBasisChangeInUnrealizedGainLossIncludedInEarnings
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_MunicipalBondsMember
Private label CMO [Member]    
Rollforward of financial instruments measured on a recurring basis and classified as Level 3    
Balance, beginning of period 30,464us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember
32,140us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember
Total gains/losses:    
Included in earnings (16)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember
(9)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember
Included in OCI (18)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember
(252)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember
Purchases 0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember
0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember
Sales 0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember
0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember
Repayments 0hban_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetRepayments
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember
0hban_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetRepayments
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember
Issuances 0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetIssues
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember
0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetIssues
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember
Settlements (426)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember
(504)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember
Balance, end of period 30,072us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember
31,897us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember
The amount of total gains or losses for the period included in earnings (or OCI) attributable to the change in unrealized gains or losses relating to assets still held at reporting date 18hban_FairValueMeasuredOnRecurringBasisChangeInUnrealizedGainLossIncludedInEarnings
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember
252hban_FairValueMeasuredOnRecurringBasisChangeInUnrealizedGainLossIncludedInEarnings
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember
Asset-backed Securities [Member]    
Rollforward of financial instruments measured on a recurring basis and classified as Level 3    
Balance, beginning of period 82,738us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_AssetBackedSecuritiesMember
107,419us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_AssetBackedSecuritiesMember
Total gains/losses:    
Included in earnings 0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_AssetBackedSecuritiesMember
(22)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_AssetBackedSecuritiesMember
Included in OCI (7,511)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_AssetBackedSecuritiesMember
(11,543)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_AssetBackedSecuritiesMember
Purchases 0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_AssetBackedSecuritiesMember
0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_AssetBackedSecuritiesMember
Sales 0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_AssetBackedSecuritiesMember
0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_AssetBackedSecuritiesMember
Repayments 0hban_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetRepayments
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_AssetBackedSecuritiesMember
0hban_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetRepayments
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_AssetBackedSecuritiesMember
Issuances 0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetIssues
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_AssetBackedSecuritiesMember
0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetIssues
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_AssetBackedSecuritiesMember
Settlements (1,094)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_AssetBackedSecuritiesMember
(9,015)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_AssetBackedSecuritiesMember
Balance, end of period 89,155us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_AssetBackedSecuritiesMember
109,969us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_AssetBackedSecuritiesMember
The amount of total gains or losses for the period included in earnings (or OCI) attributable to the change in unrealized gains or losses relating to assets still held at reporting date 7,511hban_FairValueMeasuredOnRecurringBasisChangeInUnrealizedGainLossIncludedInEarnings
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_AssetBackedSecuritiesMember
11,543hban_FairValueMeasuredOnRecurringBasisChangeInUnrealizedGainLossIncludedInEarnings
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_AssetBackedSecuritiesMember
Automobile Loan [Member]    
Rollforward of financial instruments measured on a recurring basis and classified as Level 3    
Balance, beginning of period 10,590us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_AutomobileLoanMember
52,286us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_AutomobileLoanMember
Total gains/losses:    
Included in earnings 213us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_AutomobileLoanMember
251us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_AutomobileLoanMember
Included in OCI 0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_AutomobileLoanMember
0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_AutomobileLoanMember
Purchases 0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_AutomobileLoanMember
0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_AutomobileLoanMember
Sales 0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_AutomobileLoanMember
0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_AutomobileLoanMember
Repayments (3,882)hban_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetRepayments
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_AutomobileLoanMember
(14,767)hban_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetRepayments
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_AutomobileLoanMember
Issuances 0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetIssues
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_AutomobileLoanMember
0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetIssues
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_AutomobileLoanMember
Settlements 0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_AutomobileLoanMember
0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_AutomobileLoanMember
Balance, end of period 6,495us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_AutomobileLoanMember
37,268us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_AutomobileLoanMember
The amount of total gains or losses for the period included in earnings (or OCI) attributable to the change in unrealized gains or losses relating to assets still held at reporting date $ (213)hban_FairValueMeasuredOnRecurringBasisChangeInUnrealizedGainLossIncludedInEarnings
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_AutomobileLoanMember
$ (251)hban_FairValueMeasuredOnRecurringBasisChangeInUnrealizedGainLossIncludedInEarnings
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_AutomobileLoanMember