XML 81 R69.htm IDEA: XBRL DOCUMENT
v3.25.3

FAIR VALUES OF ASSETS AND LIABILITIES - Level 3 Roll Forward (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Jun. 30, 2025 | Dec. 31, 2024 | Jun. 30, 2024 | Dec. 31, 2023
Level 3 Assets Roll Forward: |  |  |  |  |  |  |  |
Transfers into Level 3 |  |  | $ 0 |  |  |  |  |
Transfers out of Level 3 |  |  | (31) |  |  |  |  |
Derivative instruments |  |  |  |  |  |  |  |
Opening balance | $ 3 | $ (9) | 3 | $ (9) | $ 7 | $ 2 | $ 1 | $ (2)
Transfers into Level 3 | 0 | 0 |  | 0 |  |  |  |
Transfers out of Level 3 | (14) | (8) |  | (19) |  |  |  |
Included in OCI | 0 | 0 | 0 | 0 |  |  |  |
Purchases/originations | 0 | 0 | 0 | 0 |  |  |  |
Repayments | 0 | 0 | 0 | 0 |  |  |  |
Settlements | 2 | 4 | 8 | 15 |  |  |  |
Closing balance | 3 | (9) | 3 | (9) |  |  |  |
Change in unrealized gains or losses for the period included in earnings for assets held at end of the reporting date | (1) | 2 | 4 | 2 |  |  |  |
Mortgage banking income |  |  |  |  |  |  |  |
Derivative instruments |  |  |  |  |  |  |  |
Included in earnings: | 12 | 10 | 34 | 21 |  |  |  |
Other noninterest income |  |  |  |  |  |  |  |
Derivative instruments |  |  |  |  |  |  |  |
Included in earnings: | (4) | (16) | (10) | (24) |  |  |  |
Provision for credit losses |  |  |  |  |  |  |  |
Derivative instruments |  |  |  |  |  |  |  |
Included in earnings: |  |  |  | 0 |  |  |  |
Interest and fee income |  |  |  |  |  |  |  |
Derivative instruments |  |  |  |  |  |  |  |
Included in earnings: |  |  | 0 | 0 |  |  |  |
MSRs |  |  |  |  |  |  |  |
Level 3 Assets Roll Forward: |  |  |  |  |  |  |  |
Opening balance | 567 | 543 | 573 | 515 |  |  |  |
Transfers into Level 3 | 0 | 0 | 0 | 0 |  |  |  |
Transfers out of Level 3 | 0 | 0 | 0 | 0 |  |  |  |
Total gains (losses) for the period: |  |  |  |  |  |  |  |
Included in OCI | 0 | 0 | 0 | 0 |  |  |  |
Purchases/originations | 27 | 12 | 67 | 33 |  |  |  |
Repayments | 0 | 0 | 0 | 0 |  |  |  |
Settlements | (17) | (15) | (48) | (40) |  |  |  |
Closing balance | 576 | 515 | 576 | 515 | 567 | 573 | 543 | 515
Change in unrealized gains or losses for the period included in earnings for assets held at end of the reporting date | (1) | (25) | (16) | 7 |  |  |  |
MSRs | Mortgage banking income |  |  |  |  |  |  |  |
Total gains (losses) for the period: |  |  |  |  |  |  |  |
Included in earnings: | (1) | (25) | (16) | 7 |  |  |  |
MSRs | Other noninterest income |  |  |  |  |  |  |  |
Total gains (losses) for the period: |  |  |  |  |  |  |  |
Included in earnings: | 0 | 0 | 0 | 0 |  |  |  |
MSRs | Provision for credit losses |  |  |  |  |  |  |  |
Total gains (losses) for the period: |  |  |  |  |  |  |  |
Included in earnings: |  |  |  | 0 |  |  |  |
MSRs | Interest and fee income |  |  |  |  |  |  |  |
Total gains (losses) for the period: |  |  |  |  |  |  |  |
Included in earnings: |  |  | 0 | 0 |  |  |  |
Municipal securities |  |  |  |  |  |  |  |
Level 3 Assets Roll Forward: |  |  |  |  |  |  |  |
Opening balance | 4,067 | 3,341 | 3,954 | 3,335 |  |  |  |
Transfers into Level 3 | 0 | 0 | 0 | 0 |  |  |  |
Transfers out of Level 3 | 0 | 0 | 0 | 0 |  |  |  |
Total gains (losses) for the period: |  |  |  |  |  |  |  |
Included in OCI | 35 | 70 | 52 | 56 |  |  |  |
Purchases/originations | 160 | 390 | 799 | 690 |  |  |  |
Repayments | 0 | 0 | 0 | 0 |  |  |  |
Settlements | (172) | (190) | (714) | (467) |  |  |  |
Closing balance | 4,090 | 3,611 | 4,090 | 3,611 | 4,067 | 3,954 | 3,341 | 3,335
Change in unrealized gains or losses for the period included in earnings for assets held at end of the reporting date | 34 | 68 | 48 | 52 |  |  |  |
Municipal securities | Mortgage banking income |  |  |  |  |  |  |  |
Total gains (losses) for the period: |  |  |  |  |  |  |  |
Included in earnings: | 0 | 0 | 0 | 0 |  |  |  |
Municipal securities | Other noninterest income |  |  |  |  |  |  |  |
Total gains (losses) for the period: |  |  |  |  |  |  |  |
Included in earnings: | 0 | 0 | 0 | 0 |  |  |  |
Municipal securities | Provision for credit losses |  |  |  |  |  |  |  |
Total gains (losses) for the period: |  |  |  |  |  |  |  |
Included in earnings: |  |  |  | (2) |  |  |  |
Municipal securities | Interest and fee income |  |  |  |  |  |  |  |
Total gains (losses) for the period: |  |  |  |  |  |  |  |
Included in earnings: |  |  | (1) | (1) |  |  |  |
Private-label CMO |  |  |  |  |  |  |  |
Level 3 Assets Roll Forward: |  |  |  |  |  |  |  |
Opening balance | 21 | 20 | 21 | 20 |  |  |  |
Transfers into Level 3 | 0 | 0 | 0 | 0 |  |  |  |
Transfers out of Level 3 | 0 | 0 | 0 | 0 |  |  |  |
Total gains (losses) for the period: |  |  |  |  |  |  |  |
Included in OCI | 0 | 0 | 0 | 0 |  |  |  |
Purchases/originations | 0 | 0 | 0 |  |  |  |  |
Repayments | 0 | 0 | 0 | 0 |  |  |  |
Settlements | 2 | 2 | 2 | 3 |  |  |  |
Closing balance | 23 | 22 | 23 | 22 | 21 | 21 | 20 | 20
Change in unrealized gains or losses for the period included in earnings for assets held at end of the reporting date | 0 | 0 | 0 | 0 |  |  |  |
Private-label CMO | Mortgage banking income |  |  |  |  |  |  |  |
Total gains (losses) for the period: |  |  |  |  |  |  |  |
Included in earnings: | 0 | 0 | 0 | 0 |  |  |  |
Private-label CMO | Other noninterest income |  |  |  |  |  |  |  |
Total gains (losses) for the period: |  |  |  |  |  |  |  |
Included in earnings: | 0 | 0 | 0 | 0 |  |  |  |
Private-label CMO | Provision for credit losses |  |  |  |  |  |  |  |
Total gains (losses) for the period: |  |  |  |  |  |  |  |
Included in earnings: |  |  |  | 0 |  |  |  |
Private-label CMO | Interest and fee income |  |  |  |  |  |  |  |
Total gains (losses) for the period: |  |  |  |  |  |  |  |
Included in earnings: |  |  | 0 | (1) |  |  |  |
Asset-backed securities |  |  |  |  |  |  |  |
Level 3 Assets Roll Forward: |  |  |  |  |  |  |  |
Opening balance | 38 | 35 | 49 | 75 |  |  |  |
Transfers into Level 3 | 0 | 0 | 0 | 0 |  |  |  |
Transfers out of Level 3 | 0 | 0 | 0 | 0 |  |  |  |
Total gains (losses) for the period: |  |  |  |  |  |  |  |
Included in OCI | 0 | 0 | 0 | 0 |  |  |  |
Purchases/originations | 0 | 0 | 0 | 0 |  |  |  |
Repayments | 0 | 0 | 0 | 0 |  |  |  |
Settlements | 0 | (1) | (11) | (41) |  |  |  |
Closing balance | 38 | 34 | 38 | 34 | 38 | 49 | 35 | 75
Change in unrealized gains or losses for the period included in earnings for assets held at end of the reporting date | 0 | 0 | 0 | 0 |  |  |  |
Asset-backed securities | Mortgage banking income |  |  |  |  |  |  |  |
Total gains (losses) for the period: |  |  |  |  |  |  |  |
Included in earnings: | 0 | 0 | 0 | 0 |  |  |  |
Asset-backed securities | Other noninterest income |  |  |  |  |  |  |  |
Total gains (losses) for the period: |  |  |  |  |  |  |  |
Included in earnings: | 0 | 0 | 0 | 0 |  |  |  |
Asset-backed securities | Provision for credit losses |  |  |  |  |  |  |  |
Total gains (losses) for the period: |  |  |  |  |  |  |  |
Included in earnings: |  |  |  | 0 |  |  |  |
Asset-backed securities | Interest and fee income |  |  |  |  |  |  |  |
Total gains (losses) for the period: |  |  |  |  |  |  |  |
Included in earnings: |  |  | 0 | 0 |  |  |  |
Loans held for investment |  |  |  |  |  |  |  |
Level 3 Assets Roll Forward: |  |  |  |  |  |  |  |
Opening balance | 62 | 60 | 61 | 54 |  |  |  |
Transfers into Level 3 | 3 | 3 | 7 | 11 |  |  |  |
Transfers out of Level 3 | 0 | 0 | 0 | 0 |  |  |  |
Total gains (losses) for the period: |  |  |  |  |  |  |  |
Included in OCI | 0 | 0 | 0 | 0 |  |  |  |
Purchases/originations | 0 | 0 | 0 | 0 |  |  |  |
Repayments | (2) | (3) | (5) | (4) |  |  |  |
Settlements | 0 | 0 | 0 | 0 |  |  |  |
Closing balance | 63 | 60 | 63 | 60 | $ 62 | $ 61 | $ 60 | $ 54
Change in unrealized gains or losses for the period included in earnings for assets held at end of the reporting date | 0 | 0 | 0 | 0 |  |  |  |
Loans held for investment | Mortgage banking income |  |  |  |  |  |  |  |
Total gains (losses) for the period: |  |  |  |  |  |  |  |
Included in earnings: | 0 | 0 | 0 | 0 |  |  |  |
Loans held for investment | Other noninterest income |  |  |  |  |  |  |  |
Total gains (losses) for the period: |  |  |  |  |  |  |  |
Included in earnings: | $ 0 | $ 0 | 0 | 0 |  |  |  |
Loans held for investment | Provision for credit losses |  |  |  |  |  |  |  |
Total gains (losses) for the period: |  |  |  |  |  |  |  |
Included in earnings: |  |  |  | 0 |  |  |  |
Loans held for investment | Interest and fee income |  |  |  |  |  |  |  |
Total gains (losses) for the period: |  |  |  |  |  |  |  |
Included in earnings: |  |  | $ 0 | $ (1) |  |  |  |

X
- Definition Fair Value Assets Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Calculation Roll Forward. + References No definition available. + Details
Name: | hban_FairValueAssetsLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForwardAbstract
Namespace Prefix: | hban_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Repayments. + References No definition available. + Details
Name: | hban_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetRepayments
Namespace Prefix: | hban_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Repayments + References No definition available. + Details
Name: | hban_FairValueNetDerivativeAssetLiabilityMeasuredonRecurringBasisUnobservableInputsReconciliationRepayments
Namespace Prefix: | hban_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of unrealized gain (loss) recognized in income from asset measured at fair value on recurring basis using unobservable input (level 3) and still held. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 101 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482078/820-10-55-101 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-3 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 102 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482078/820-10-55-102 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
Name: | us-gaap_FairValueAssetsMeasuredOnRecurringBasisChangeInUnrealizedGainLoss
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
Name: | us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of gain (loss) recognized in income from asset measured at fair value on recurring basis using unobservable input (level 3). + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 101 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482078/820-10-55-101 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-3 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 102 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482078/820-10-55-102 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
Name: | us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of gain (loss) recognized in other comprehensive income (OCI) from asset measured at fair value on recurring basis using unobservable input (level 3). + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 101 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482078/820-10-55-101 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-3 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
Name: | us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of purchases of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2G -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2G Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 101 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482078/820-10-55-101 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-3 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
Name: | us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of settlement of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 101 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482078/820-10-55-101 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-3 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
Name: | us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of transfer of financial instrument classified as an asset into level 3 of the fair value hierarchy. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2G -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2G Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 101 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482078/820-10-55-101 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-3 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(3) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
Name: | us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersIntoLevel3
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of transfers of financial instrument classified as an asset out of level 3 of the fair value hierarchy. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2G -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2G Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 101 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482078/820-10-55-101 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-3 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(3) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
Name: | us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersOutOfLevel3
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Fair value of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 101 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482078/820-10-55-101 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-3 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
Name: | us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of unrealized gain (loss) recognized in income for derivative asset (liability) after deduction of derivative liability (asset), measured at fair value using unobservable input (level 3) and still held. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-3 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
Name: | us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisChangeInUnrealizedGainLoss
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
Name: | us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputReconciliationRollForward
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of gain (loss) recognized in income from derivative asset (liability) after deduction of derivative liability (asset), measured at fair value on recurring basis using unobservable input (level 3). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-3 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
Name: | us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationGainLossIncludedInEarnings
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of gain (loss) recognized in other comprehensive income from derivative asset (liability) after deduction of derivative liability (asset), measured at fair value on recurring basis using unobservable input (level 3). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-3 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
Name: | us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationGainLossIncludedInOtherComprehensiveIncomeLoss
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of purchases of financial instrument classified as a derivative asset (liability) after deduction of derivative liability (asset), measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-3 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
Name: | us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationPurchases
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of settlements of financial instrument classified as a derivative asset (liability) after deduction of derivative liability, measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-3 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
Name: | us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationSettlements
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of transfers of financial instrument classified as a derivative asset (liability) after deduction of derivative liability (asset) into level 3 of the fair value hierarchy. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-3 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(3) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
Name: | us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationTransfersIntoLevel3
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of transfers of financial instrument classified as derivative asset (liability) after deduction of derivative liability (asset) out of level 3 of the fair value hierarchy. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-3 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(3) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
Name: | us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationTransfersOutOfLevel3
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Fair value of financial instrument classified as derivative asset (liability) after deduction of derivative liability (asset), measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-3 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
Name: | us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisWithUnobservableInputs
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | us-gaap_IncomeStatementLocationAxis=hban_MortgageBankingIncomeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_IncomeStatementLocationAxis=hban_NoninterestIncomeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_IncomeStatementLocationAxis=hban_ProvisionForCreditLossMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_IncomeStatementLocationAxis=hban_InterestandFeeIncomeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByAssetClassAxis=hban_MortgageServicingRightsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByAssetClassAxis=us-gaap_MunicipalBondsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByAssetClassAxis=us-gaap_MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByAssetClassAxis=us-gaap_AssetBackedSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByAssetClassAxis=hban_LoansheldforinvestmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |