Accumulated Amortization Finite-Lived Intangible Assets, Accumulated Amortization Schedule of Short-term Debt Schedule of Short-Term Debt [Table Text Block] Commodities contracts Commodity Contract [Member] Total Gains/(Losses) Changes Measurement [Member] Cumulative default Measurement Input, Default Rate [Member] Award Timing Predetermined Award Timing Predetermined [Flag] Proportional amortization expense included in provision for income taxes Investment Program, Proportional Amortization Method, Applied, Amortization Expense Entity File Number Entity File Number Credit contracts Credit Risk Contract [Member] Capital Surplus Additional Paid-in Capital [Member] Tabular List, Table Tabular List [Table Text Block] Total other comprehensive income (loss), tax (expense) benefit Other Comprehensive Income (Loss), Tax Accounting Standards Update New Accounting Pronouncements, Policy [Policy Text Block] Carrying Amounts and Estimated Fair Values of Financial Instruments Fair Value, by Balance Sheet Grouping [Table Text Block] Maximum amount guaranteed Guarantor Obligations, Maximum Exposure, Undiscounted Debt securities Debt Securities [Member] Demand deposits—noninterest-bearing Noninterest-Bearing Deposit Liabilities, Domestic Tax (expense) benefit Other Comprehensive Income (Loss), Tax [Abstract] Goodwill [Line Items] Goodwill [Line Items] Equity-based Awards Share-Based Payment Arrangement [Member] Measurement Basis [Axis] Measurement Basis [Axis] Adjustment to Compensation: Adjustment to Compensation [Axis] Over 12 Months, Fair Value Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value Named Executive Officers, Footnote Named Executive Officers, Footnote [Text Block] REVENUE FROM CONTRACTS WITH CUSTOMERS Revenue from Contract with Customer [Text Block] Financing Receivable Portfolio Segment [Domain] Financing Receivable Portfolio Segment [Domain] Dividends paid on preferred stock Payments of Ordinary Dividends, Preferred Stock and Preference Stock Recoveries of loans and leases previously charged-off Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Recovery Schedule of Stock by Class [Table] Stock, Class of Stock [Table] Spread over forward interest rate swap rates Measurement Input, Option Adjusted Spread [Member] Spread over forward interest rate swap rates Net gains (losses) from fair value changes Fair Value, Option, Changes in Fair Value, Gain (Loss) After 1 year through 5 years Debt Securities, Held-to-Maturity, Amortized Cost Excluding Accrued Interest, after Allowance for Credit Loss, Maturity, Allocated and Single Maturity Date, after Year One through Five Adjustment to Compensation, Amount Adjustment to Compensation Amount Share-based compensation expense Share-Based Payment Arrangement, Noncash Expense Affordable housing tax credit partnerships Low Income Housing Tax Credit Partners [Member] Low Income Housing Tax Credit Partners Member. Employee Stock Options Share-Based Payment Arrangement, Option [Member] Net loans and leases Financing Receivable, after Allowance for Credit Loss Antidilutive Securities [Axis] Antidilutive Securities [Axis] Debt securities transferred from available-for-sale OCI, Debt Securities, Held-to-Maturity, Transfer from Available-for-Sale, Gain (Loss), before Adjustment, after Tax OCI, Debt Securities, Held-to-Maturity, Transfer from Available-for-Sale, Gain (Loss), before Adjustment, after Tax Consumer loan portfolio Consumer Loan [Member] Common Dividends, Common Stock, Cash Total Huntington shareholders’ equity Equity, Attributable to Parent Measurement Frequency [Axis] Measurement Frequency [Axis] After 5 years through 10 years Debt Securities, Held-to-Maturity, Amortized Cost Excluding Accrued Interest, after Allowance for Credit Loss, Maturity, Allocated and Single Maturity Date, after Year 5 through 10 Other comprehensive (loss) income, net of tax: After-tax Other Comprehensive Income (Loss), Net of Tax [Abstract] Insider Trading Policies and Procedures [Line Items] Spread over forward interest rate swap rates, 20% adverse change Sensitivity Analysis of Fair Value, Transferor's Interests in Transferred Financial Assets, Impact of 20 Percent Adverse Change in Discount Rate Non-marketable equity securities: Nonmarketable Equity Securities [Member] Nonmarketable Equity Securities [Member] Common shares authorized (in shares) Common Stock, Shares Authorized Financial Assets Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] Sensitivity Analysis of Fair Value of Servicing Rights [Axis] Sensitivity Analysis Of Fair Value Of Servicing Rights [Axis] Sensitivity Analysis Of Fair Value Of Servicing Rights. Allowance for loan and lease losses Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Loans And Leases Receivable, Allowance For Credit Loss Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Loans And Leases Receivable, Allowance For Credit Loss Derivative credit and equity contracts not designated as hedging instruments, liability Derivative Instruments Not Designated as Hedging Instruments, Liability, at Fair Value Liabilities and shareholders’ equity Liabilities and Equity [Abstract] Cover [Abstract] Cover [Abstract] Portion at Fair Value Measurement Portion at Fair Value Measurement [Member] Maximum Maximum [Member] Held-to-maturity securities Amortized Cost Debt Securities, Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss Useful life Finite-Lived Intangible Asset, Useful Life Difference Fair Value, Option, Aggregate Differences, Long-Term Debt Instruments Income attributable to non-controlling interest Net Income (Loss) Attributable to Noncontrolling Interest Investment, Variable Interest Rate, Type [Extensible Enumeration] Investment, Variable Interest Rate, Type [Extensible Enumeration] Net Carrying Value Finite-Lived Intangible Assets, Net Total, Fair Value Debt Securities, Available-for-Sale, Unrealized Loss Position After 10 years Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year 10 Non-PEO NEO Average Total Compensation Amount Non-PEO NEO Average Total Compensation Amount Debt Instrument [Line Items] Debt Instrument [Line Items] Adjustment to Non-PEO NEO Compensation Footnote Adjustment to Non-PEO NEO Compensation Footnote [Text Block] Financing Receivable, Credit Quality Indicator [Table] Financing Receivable, Credit Quality Indicator [Table] Affordable Housing Tax Credit Investments Affordable Housing Tax Credit Investments [Table Text Block] Affordable Housing Tax Credit Investments Table. Series B Series B Preferred Stock [Member] Forgone Recovery due to Disqualification of Tax Benefits, Amount Forgone Recovery due to Disqualification of Tax Benefits, Amount Interest rate contracts designated as hedging instruments Interest Rate Fair Value Hedge Liability at Fair Value Provision for credit losses Provision for credit losses Financing Receivable And Off-Balance Sheet, Credit Loss, Expense (Reversal) Financing Receivable And Off-Balance Sheet, Credit Loss, Expense (Reversal) Non-Rule 10b5-1 Arrangement Terminated Non-Rule 10b5-1 Arrangement Terminated [Flag] Weighted-average years added to the life Financing Receivable, Modified, Weighted Average Term Increase from Modification Income before income taxes Income (loss) before income taxes Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Leasing revenue Leasing Revenue [Member] Leasing Revenue Entity Shell Company Entity Shell Company Available-for-sale securities Interest and Dividend Income, Securities, by Taxable Status [Abstract] Allowance on PCD loans and leases at acquisition Financing Receivable, Allowance for Credit Loss, Purchased with Credit Deterioration, Increase Revolver Total Converted to Term Loans Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan Schedule of Long-term Debt Instruments [Table] Schedule of Long-Term Debt Instruments [Table] Unrealized Gross Losses Equity Securities, FV-NI, Accumulated Gross Unrealized Loss, Before Tax Equity Securities, FV-NI, Accumulated Gross Unrealized Loss, Before Tax Purchases of other securities Payments To Acquire Other Securities Payments To Acquire Other Securities Statement of Stockholders' Equity [Abstract] Statement of Stockholders' Equity [Abstract] Operating Segments Operating Segments [Member] Servicing rights and other intangible assets Other Intangible Assets, Net Comprehensive income attributed to non-controlling interest Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest Award Timing MNPI Considered Award Timing MNPI Considered [Flag] Lease payments receivable Direct Financing Lease, Lease Receivable Total interest expense Interest Expense, Operating Document Fiscal Period Focus Document Fiscal Period Focus Derivatives, Fair Value [Line Items] Derivatives, Fair Value [Line Items] Assets and Liabilities Under the Fair Value Option Fair Value Option, Disclosures [Table Text Block] Award Timing Method Award Timing Method [Text Block] Award Type Award Type [Axis] Hedging Relationship [Domain] Hedging Relationship [Domain] Future lease rental payments due on sales-type and direct financing leases, year three Sales-Type and Direct Financing Leases, Payment to be Received, Year Three Loans held for investment Loans held for investment [Member] Loans held for investment Parent Parent Company [Member] Business Combination, Pro Forma Information Business Combination, Pro Forma Information [Table Text Block] Trading Symbol Trading Symbol Accrued expenses and other liabilities Accrued Expenses And Other Liabilities [Member] Accrued expenses and other liabilities. Tax-exempt Interest Income, Securities, Operating, Tax Exempt Affordable housing tax credit investments Gross Investment In Qualified Affordable Housing Projects Gross Investment In Qualified Affordable Housing Projects Other share-based compensation activity (in shares) Shares Issued, Shares, Share-Based Payment Arrangement, after Forfeiture Entity Address, City or Town Entity Address, City or Town Short-term Debt, Type [Domain] Short-Term Debt, Type [Domain] Hedged Subordinated notes Hedged Subordinated notes [Member] Hedged Subordinated notes. Series L Preferred Stock Series L Series L Preferred Stock [Member] Series L Preferred Stock Class of Financing Receivable [Axis] Class of Financing Receivable [Axis] Non-PEO NEO Average Compensation Actually Paid Amount Non-PEO NEO Average Compensation Actually Paid Amount Decrease in short-term borrowings Proceeds from (Repayments of) Short-Term Debt Statement of Income Location, Balance [Domain] Statement of Income Location, Balance [Domain] Commitments to sell residential real estate loans Commitments to sell residential real estate loans Commitments to sell residential real estate loans. Compensation Actually Paid vs. Other Measure Compensation Actually Paid vs. Other Measure [Text Block] Consideration transferred Total consideration Business Combination, Consideration Transferred Short-term borrowings Interest Expense, Short-Term Borrowings FHLB borrowings and advances, collateral Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Collateral Pledged Entity Emerging Growth Company Entity Emerging Growth Company Non-PCD loans Financial Asset Acquired Without Purchased Credit Deterioration For Purchased Seasoned Loan [Member] Financial Asset Acquired Without Purchased Credit Deterioration For Purchased Seasoned Loan Gross amounts not offset in the condensed consolidated balance sheets, Cash collateral delivered Derivative Liability, Subject to Master Netting Arrangement, Collateral, Right to Reclaim Cash Not Offset Less than 12 Months, Gross Unrealized Losses Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss Other securities Other Securities Other Securities Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year [Member] Trading gains (losses) Derivative, Gain (Loss) on Derivative, Net Noninterest income Noninterest Income Shares held in deferred compensation plans Incremental Common Shares Attributable to Dilutive Effect of Contingently Issuable Shares Common share outstanding (in shares) Balance, beginning of period, common stock (in shares) Balance, end of period, common stock (in shares) Common Stock, Shares, Outstanding Unrealized Gross Losses Debt Securities, Held-to-Maturity, Accumulated Unrecognized Loss Noninterest expense: Noninterest Expense [Abstract] Schedule of Noninterest Income Disaggregation of Revenue [Table Text Block] Cash and due from banks Cash and Due from Banks Tax credits and other tax benefits recognized Investment Program, Proportional Amortization Method, Elected, Income Tax Credit and Other Income Tax Benefit, before Amortization Expense Other noninterest income Noninterest income [Member] Noninterest income Class of Financing Receivable [Domain] Class of Financing Receivable [Domain] Huntington National Bank Unsecured Notes Maturing March 2033 Huntington National Bank Unsecured Notes Maturing March 2033 [Member] Huntington National Bank Unsecured Notes Maturing March 2033 Other securities—taxable Interest Income, Securities, Operating, Other, Taxable Interest Income, Securities, Operating, Other, Taxable Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year [Member] Contract amount represents credit risk Guarantor Obligations, Current Carrying Value Derivative Instruments and Hedging Activities Disclosure [Abstract] Derivative Instruments and Hedging Activities Disclosure [Abstract] After 1 year through 5 years Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, after Year One Through Five Weighted-average contractual interest rate Financing Receivable, Modified, Weighted Average Interest Rate Decrease from Modification Pledged Status [Domain] Pledged Status [Domain] Entity Address, Postal Zip Code Entity Address, Postal Zip Code Restatement Determination Date Restatement Determination Date Provision for income taxes Provision (benefit) for income taxes Income Tax Expense (Benefit) Series K Series K Preferred Stock [Member] Series K Preferred Stock Basis spread on variable rate Debt Instrument, Basis Spread on Variable Rate Other assets Other Assets Opening balance Closing balance Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value Schedule of Investment Securities and Other Securities [Table] Schedule of Investment Securities and Other Securities [Table] Schedule of Investment Securities and Other Securities [Table] Servicing asset, measurement input Servicing Asset, Measurement Input Pension Adjustments Service Cost Pension Adjustments Service Cost [Member] Derivatives designated as Hedging Instruments Designated as Hedging Instrument [Member] Amortized Cost Amortized Cost [Member] Amortized Cost [Member] Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Hedging Relationship [Axis] Hedging Relationship [Axis] Under 1 year Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, Year One Other borrowings Other Notes Payable, Other Payables [Member] Compensation Actually Paid vs. Company Selected Measure Compensation Actually Paid vs. Company Selected Measure [Text Block] Cadence acquisition Goodwill, Acquired During Period All Trading Arrangements All Trading Arrangements [Member] Equity Awards Adjustments, Footnote Equity Awards Adjustments, Footnote [Text Block] Total Shareholder Return Vs Peer Group Total Shareholder Return Vs Peer Group [Text Block] Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Disclosure [Abstract] Net cash provided by operating activities Cash Provided by (Used in) Operating Activity, Including Discontinued Operation Commodities contracts not designated as hedging instruments Price Risk Derivative Instruments Not Designated as Hedging Instruments Liability, at Fair Value Sales of available-for-sale securities Proceeds from Sale of Debt Securities, Available-for-Sale Available-for-sale securities Fair Value Fair Value Debt Securities, Available-for-Sale, Excluding Accrued Interest Net loans and leases Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Loans And Leases Receivable, After Allowance For Credit Loss Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Loans And Leases Receivable, After Allowance For Credit Loss Net interest income Net interest income (loss) Interest Income (Expense), Operating Equity Valuation Assumption Difference, Footnote Equity Valuation Assumption Difference, Footnote [Text Block] PEO Total Compensation Amount PEO Total Compensation Amount Long-term Debt, Type [Axis] Long-Term Debt, Type [Axis] Loans transferred to portfolio from held-for-sale Loan, Transfer from Held-for-Sale to Held-in-Portfolio Interest income available for sale securities taxable Interest income available for sale securities taxable [Member] Interest income available for sale securities taxable Gross amounts of recognized liabilities Derivative liabilities, gross Total contracts Derivative Liability, Subject to Master Netting Arrangement, before Offset Assets acquired Business Combination, Recognized Asset Acquired, Asset [Abstract] Direct financing leases, interest income Direct Financing Lease, Interest Income Payments and cash management revenue Cards And Payment Processing Revenue [Member] Cards And Payment Processing Revenue [Member] Available-for-sale securities, amortized cost: Debt Securities, Available-for-Sale, Amortized Cost, Rolling Maturity [Abstract] Equity Components [Axis] Equity Components [Axis] Year four Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year Standby letters of credit and guarantees on industrial revenue bonds Standby Letters of Credit [Member] Non-Rule 10b5-1 Arrangement Adopted Non-Rule 10b5-1 Arrangement Adopted [Flag] Mortgage banking income Mortgage Banking Income [Member] Mortgage Banking Income [Member] Number of reporting segments Number of Reportable Segments Commercial real estate Commercial real estate Commercial Real Estate [Member] Entity Address, State or Province Entity Address, State or Province Substandard Substandard [Member] Future lease rental payments due on sales-type and direct financing leases, after year five Sales-Type and Direct Financing Leases, Payment to be Received, after Year Five Total interest income Interest and Dividend Income, Operating OLEM Special Mention [Member] Financial Asset, Period Past Due [Domain] Financial Asset, Aging [Domain] Antidilutive Security, Excluded EPS Calculation [Table] Antidilutive Security, Excluded EPS Calculation [Table] Derivative financial instruments used by Huntington on behalf of customers including offsetting derivatives, notional value Derivative Financial Instruments Used By Company On Behalf Of Customers Including Offsetting Derivatives Notional Value Derivative financial instruments used by Huntington on behalf of customers including offsetting derivatives, notional value. Loans held for investment, fair value Loans Accounted for Under FVO Loans Receivable, Fair Value Disclosure Individual: Individual [Axis] Dividends paid on common stock Payments of Ordinary Dividends, Common Stock Loans held for sale Increase (Decrease) in Loan, Held-for-Sale Entities [Table] Entities [Table] Fair Value or Fair Value Option Fair Value Fair Value Option [Member] Fair Value Fair Value Option [Member] Less than 650 FICO Score, Less than 650 [Member] FICO Score, Less than 650 Maximum Exposure to Loss Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount Forgone Recovery, Explanation of Impracticability Forgone Recovery, Explanation of Impracticability [Text Block] Loans held for sale, aggregate unpaid principal Mortgages Held For Sale Unpaid Principal For mortgages held for sale for which the fair value option has been elected, this item represents the aggregate unpaid principal balance. Repayment of long-term debt Repayments of Long-Term Debt Entity Interactive Data Current Entity Interactive Data Current Mutual funds Mutual Fund [Member] Financing Receivable, Modified [Line Items] Financing Receivable, Modified [Line Items] Interest and fee income: Interest and Dividend Income, Operating [Abstract] Total noninterest expense Total noninterest expense Noninterest Expense Disaggregation of Revenue [Table] Disaggregation of Revenue [Table] Payment deferral Payment Deferral [Member] ALLOWANCE FOR CREDIT LOSSES Allowance for Credit Losses [Text Block] Deposits Interest Expense, Deposits Noninterest income: Noninterest Income [Abstract] Lease financing Financing Lease [Member] Financing Lease Entity Central Index Key Entity Central Index Key PEO Name PEO Name Amount of Gain or (Loss) Recognized in Income on Derivatives Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net Total lease financing receivables Direct Financing Lease, Net Investment in Lease, Excluding Accrued Interest, before Allowance for Credit Loss Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year [Member] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Loan and Lease Balances by Credit Quality Indicator Financing Receivable Credit Quality Indicators [Table Text Block] Outstanding Aggregate Erroneous Compensation Amount Outstanding Aggregate Erroneous Compensation Amount Unfunded commitments Investment Program, Proportional Amortization Method, Elected, Commitment Schedule of Segment Reporting Information, by Segment [Table] Schedule of Segment Reporting Information, by Segment [Table] Derivative assets netting Derivative assets, netting adjustments Gross amounts
offset in the unaudited
consolidated
balance sheets Derivative Asset, Subject to Master Netting Arrangement, Gross Liability and Collateral, Obligation to Return Cash, Offset Exercise Price Award Exercise Price Entity Filer Category Entity Filer Category Class of Stock [Domain] Class of Stock [Domain] Fair Value Option, Disclosures [Table] Fair Value Option, Disclosures [Table] Statement of Financial Position Location, Balance [Axis] Statement of Financial Position Location, Balance [Axis] Loans and leases Financing Receivable, before Allowance for Credit Loss Customer deposit and loan fees Service Charges Revenue [Member] Service Charges Revenue [Member] Series B, H and J Preferred Stock Series B, H And J Preferred Stock [Member] Series B, H And J Preferred Stock Reclassification adjustment for cash flow hedges included in net income Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax Gross Carrying Amount Finite-Lived Intangible Assets, Gross Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year [Member] Entity Address, Address Line One Entity Address, Address Line One AOCI AOCI Attributable to Parent [Member] Investments [Domain] Investments [Domain] Revolver Converted to Term Loans Gross Charge-offs Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan, Writeoff Internal Credit Assessment [Axis] Internal Credit Assessment [Axis] Preferred stock issued Stock Issued Business Combination, Asset Acquisition, Transaction between Entities under Common Control, and Joint Venture Formation [Abstract] Investment securities Securities Investment [Member] Internal Credit Assessment [Domain] Internal Credit Assessment [Domain] DERIVATIVE FINANCIAL INSTRUMENTS Derivative Instruments and Hedging Activities Disclosure [Text Block] Schedule of Stock Schedule of Stock by Class [Table Text Block] Fair Value as of Grant Date Award Grant Date Fair Value Other consumer Other Consumer Loan [Member] Other consumer loan. Amortized Cost Equity Securities, FV-NI, Cost Year five Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year Schedule of Long-term Debt Instruments Schedule of Long-Term Debt Instruments [Table Text Block] Personnel costs Direct personnel costs Labor and Related Expense Derivative Instruments and Hedging Activities Disclosures [Table] Derivative Instruments and Hedging Activities Disclosures [Table] Servicing Asset at Amortized Cost [Table] Servicing Asset at Amortized Cost [Table] Private-label CMO Mortgage-Backed Securities, Issued by Private Enterprises [Member] Stock options, restricted stock units and awards, and performance share units Incremental Common Shares Attributable to Dilutive Effect of Share-Based Payment Arrangements Servicing Right Carrying Method [Domain] Servicing Right Carrying Method [Domain] Distiniguishes if the servicing right is carried under the fair value method or the amortization method Document Quarterly Report Document Quarterly Report Less than 12 Months, Fair Value Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months Other securities, at cost: Other Securities, Amortized Cost [Abstract] Other Securities, Amortized Cost Quantitative Information About Significant Unobservable Level 3 Fair Value Measurement Inputs Fair Value Measurement Inputs and Valuation Techniques [Table Text Block] Long-term debt Long-Term Debt, Fair Value Changed Peer Group, Footnote Changed Peer Group, Footnote [Text Block] Over 12 Months, Gross Unrealized Losses Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss NALs and Past Due Loans Financing Receivable, Nonaccrual [Table Text Block] Translation adjustments, net of hedges Accumulated Foreign Currency Adjustment Net Of Investment Hedges Attributable to Parent [Member] Accumulated Foreign Currency Adjustment Net Of Investment Hedges Attributable to Parent Series I Series I Preferred Stock [Member] Series I Preferred Stock Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type [Table] Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type [Table] Carrying value of residual values guaranteed Residual Value of Leased Asset Total U.S. Treasury, federal agency, and other agency securities US Government-sponsored Enterprises Debt Securities [Member] Other noninterest income Other Income [Member] Adjustment To PEO Compensation, Footnote Adjustment To PEO Compensation, Footnote [Text Block] New Accounting Pronouncements and Changes in Accounting Principles [Abstract] Accounting Standards Update and Change in Accounting Principle [Abstract] Investment Type [Axis] Investment Type [Axis] Title Trading Arrangement, Individual Title Peer Group Total Shareholder Return Amount Peer Group Total Shareholder Return Amount Cash Payments to Acquire Businesses, Gross Non-PEO NEO Non-PEO NEO [Member] 650-749 FICO Score, 650-749 [Member] FICO Score, 650-749 Dividend Rate Preferred Stock, Dividend Rate, Percentage Accumulated Other Comprehensive Income (Loss) [Line Items] Accumulated Other Comprehensive Income (Loss) [Line Items] Principal payments received under direct finance leases Finance Principal Lease Payments Finance Principal Lease Payments - Amounts of cash inflow for principal payment on finance lease Other intangible assets Other Intangible Assets [Member] Unrealized Gross Gains Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax Offsetting of Financial Assets and Derivatives Assets Offsetting Assets [Table Text Block] Allowance for loan losses Financing Receivable, Allowance for Credit Loss All Award Types Award Type [Domain] Home equity Home Equity, Including FVO [Member] Home Equity, Including FVO Non-controlling interest Equity, Attributable to Noncontrolling Interest Equity Awards Adjustments Equity Awards Adjustments [Member] Other, net Other Noncash Income (Expense) Pension Benefits Adjustments, Footnote Pension Benefits Adjustments, Footnote [Text Block] Disaggregation of Revenue [Line Items] Disaggregation of Revenue [Line Items] Bank Non-Guarantor Subsidiaries [Member] Compensation Amount Outstanding Recovery Compensation Amount Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Foreign exchange contracts Foreign Exchange Contract [Member] Recovery of Erroneously Awarded Compensation Disclosure [Line Items] Fair Value Estimate of Fair Value Measurement Estimate of Fair Value Measurement [Member] MNPI Disclosure Timed for Compensation Value MNPI Disclosure Timed for Compensation Value [Flag] After 1 year through 5 years Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year One Through Five Fair Value, Option, Quantitative Disclosures [Line Items] Fair Value, Option, Quantitative Disclosures [Line Items] Interest rate contracts not designated as hedging instruments Interest Rate Derivative Instruments Not Designated as Hedging Instruments, Asset at Fair Value Short-term borrowings Increase (Decrease) in Notes Payable, Current After 5 years through 10 years Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10 Net affordable housing tax credit investments Investment, Proportional Amortization Method, Elected, Amount Accumulated other comprehensive income (loss) Accumulated Other Comprehensive Income (Loss), Net of Tax Financial Instruments [Domain] Financial Instruments [Domain] After 10 years Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 10 Purchases/originations Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases Aggregate Pension Adjustments Service Cost Aggregate Pension Adjustments Service Cost [Member] Constant prepayment rate (annualized), 10% adverse change Sensitivity Analysis of Fair Value, Transferor's Interests in Transferred Financial Assets, Impact of 10 Percent Adverse Change in Prepayment Speed Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets by Major Class [Axis] Minimum Minimum [Member] Future lease rental payments due on sales-type and direct financing leases, year four Sales-Type and Direct Financing Leases, Payment to be Received, Year Four Net interest income after provision for credit losses Net interest income (loss) after provision for credit losses Interest Income (Expense), after Provision for Loan Loss Accrued interest receivable Financing Receivable, Accrued Interest, before Allowance for Credit Loss Accounts, Notes, Loans and Financing Receivable [Line Items] Accounts, Notes, Loans and Financing Receivable [Line Items] Company Selected Measure Name Company Selected Measure Name Fair Value Measurement [Domain] Fair Value Measurement [Domain] Net income attributable to Huntington Business Combination, Pro Forma Information, Pro Forma Income (Loss), after Tax Contract Amounts of Various Commitments to Extend Credit Schedule of Fair Value, off-Balance-Sheet Risks [Table Text Block] Aggregate Available Trading Arrangement, Securities Aggregate Available Amount Stock Appreciation Rights (SARs) Stock Appreciation Rights (SARs) [Member] Other comprehensive income (loss), pretax Other Comprehensive Income (Loss), before Tax Net income available to common shareholders, diluted Net Income (Loss) Available to Common Stockholders, Diluted Goodwill by business segment Goodwill [Roll Forward] 90 or more days past due and accruing Financing Receivable, 90 Days or More Past Due, Still Accruing Series F and G Preferred Stock Series F And G Preferred Stock [Member] Series F And G Preferred Stock Gross Notional Values of Derivatives Used in Asset and Liability Management Activities Gross notional values of derivatives used in asset and liability management activities [Table Text Block] Gross notional values of derivatives used in asset and liability management activities. COMMITMENTS AND CONTINGENT LIABILITIES Commitments and Contingencies Disclosure [Text Block] Net derivative asset (liability) Derivative Assets (Liabilities), at Fair Value, Net Average common shares—diluted (in shares) Total diluted average common shares issued and outstanding (in shares) Weighted Average Number of Shares Outstanding, Diluted Non-GAAP Measure Description Non-GAAP Measure Description [Text Block] Derivative [Table] Derivative [Table] Home equity Home Equity Loan [Member] Short-term borrowings Business Combination, Recognized Liability Assumed, Long-Term Debt, Current Entity Small Business Entity Small Business Business combination, voting equity interest acquired, percentage Business Combination, Voting Equity Interest Acquired, Percentage Investment securities and cash collateral pledged to Huntington Investment securities and cash collateral pledged to company Investment securities and cash collateral pledged to company. Preferred shares outstanding (in shares) Shares outstanding (in shares) Preferred Stock, Shares Outstanding BORROWINGS Long-Term Debt [Text Block] Document Transition Report Document Transition Report After 1 year through 5 years Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year One Through Five Other assets Business Combination, Recognized Asset Acquired, Other Asset, Noncurrent Carrying Amount Preferred Stock, Value, Outstanding Underlying Securities Award Underlying Securities Amount Other comprehensive income (loss) before reclassifications Other Comprehensive Income (Loss), before Reclassifications, before Tax Equity Component [Domain] Equity Component [Domain] Document Period End Date Document Period End Date Cumulative Amount of Fair Value Hedging Adjustment To Hedged Items Hedged Asset, Fair Value Hedge, Portfolio Layer Method, Hedged Layer, Fair Value, Cumulative Increase (Decrease) Awards Close in Time to MNPI Disclosures, Table Awards Close in Time to MNPI Disclosures [Table Text Block] Designated hedged items Hedged Asset, Fair Value Hedge, Portfolio Layer Method, Hedged Layer, Amount Net amount Derivative Asset, Including Not Subject to Master Netting Arrangement, after Offset and Deduction Total equity Balance, beginning of period Balance, end of period Equity, Including Portion Attributable to Noncontrolling Interest Document Type Document Type Level 3 Fair Value, Inputs, Level 3 [Member] EARNINGS PER SHARE Earnings Per Share [Text Block] Name Outstanding Recovery, Individual Name Loss Contingencies [Table] Loss Contingencies [Table] Capital surplus Additional Paid in Capital Wealth and asset management revenue Wealth And Asset Management Revenue [Member] Wealth And Asset Management Revenue Product and Service [Axis] Product and Service [Axis] Revolver Gross Charge-offs Financing Receivable, Excluding Accrued Interest, Revolving, Writeoff Wealth and asset management revenue Revenue from Contract with Customer, Excluding Assessed Tax Commodities contracts not designated as hedging instruments Price Risk Derivative Instruments Not Designated as Hedging Instruments Asset, at Fair Value Statistical Measurement [Axis] Statistical Measurement [Axis] Credit Score, FICO [Domain] Credit Score, FICO [Domain] Year two Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year, Writeoff Fair Value Inputs, Assets, Quantitative Information [Line Items] Fair Value Measurement Inputs and Valuation Techniques [Line Items] Aggregate Erroneous Compensation Amount Aggregate Erroneous Compensation Amount Peer Group Issuers, Footnote Peer Group Issuers, Footnote [Text Block] Net income applicable to common shares Net Income (Loss) Available to Common Stockholders, Basic Entity Information [Line Items] Entity Information [Line Items] Other comprehensive (loss) income, net of tax Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent Combo - interest rate reduction and term extension Extended Maturity and Interest Rate Reduction [Member] Marcy Hingst [Member] Marcy Hingst Gains and (Losses) Recognized in Other Comprehensive Income (Loss) (OCI) for Derivatives Designated as Effective Cash Flow Hedges Derivative Instruments, Gain (Loss) [Table Text Block] Amortized cost basis Financing Receivable, Excluding Accrued Interest, Modified, after 12 Months Other assets Accrued Income and Other Assets The increase (decrease) during the reporting period in the aggregate amount of accrued expenses and the increase (decrease) during the reporting period in other assets used in operating activities not separately disclosed in the statement of cash flows. May include changes in other current assets, other noncurrent assets, or a combination of other current and noncurrent assets. Level 1 Fair Value, Inputs, Level 1 [Member] Other securities Other Securities, Fair Value Other Securities, Fair Value Net income—diluted (in usd per share) Diluted earnings per common share (in usd per share) Earnings Per Share, Diluted Deposit and other insurance expense Federal Deposit Insurance Corporation Premium Expense Reclassification out of Accumulated Other Comprehensive Income [Axis] Reclassification out of Accumulated Other Comprehensive Income [Axis] After 5 years through 10 years Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10 AOCI Attributable to Parent, Net of Tax [Roll Forward] AOCI Attributable to Parent, Net of Tax [Roll Forward] Total Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount Preferred Amount Dividends, Preferred Stock, Cash Commercial and industrial Commercial Loan [Member] ACL, period increase (decrease) Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Period Increase (Decrease) Treasury shares outstanding (in shares) Balance, beginning of period, treasury stock (in shares) Balance, end of period, treasury stock (in shares) Treasury Stock, Common, Shares Consolidation Items [Domain] Consolidation Items [Domain] Long-term debt Interest Expense, Other Long-Term Debt Asset derivatives included in accrued income and other assets Asset derivatives included in accrued income and other assets [Abstract] Asset derivatives included in accrued income and other assets. Investments, Debt and Equity Securities [Abstract] Investments, Debt and Equity Securities [Abstract] Core deposit intangible Core Deposits [Member] Variable Interest Entity Variable Interest Entity, Not Primary Beneficiary [Member] New servicing assets created Servicing Asset at Fair Value, Additions Series J Series J Preferred Stock [Member] Series J Preferred Stock Term extension Extended Maturity [Member] Repurchases of common stock Stock Repurchased and Retired During Period, Value Financing Receivable Portfolio Segment [Axis] Financing Receivable Portfolio Segment [Axis] Payoffs Servicing Asset At Fair Value Payoffs Servicing Asset At Fair Value Payoffs. Other Stockholders' Equity, Other Unpaid principal balance Financing Receivable, before Allowance for Credit Loss, Fee and Loan in Process Included in earnings Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Gain (Loss) Included in Earnings Net interest income Interest and dividend income operating [Member] Interest and dividend income operating Income taxes paid Income Taxes Paid, Net Long-term debt, aggregate unpaid principal Long-Term Debt, Gross Loans and leases Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Loans And Leases Receivable, Before Allowance For Credit Loss Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Loans And Leases Receivable, Before Allowance For Credit Loss MSRs Mortgage servicing rights [Member] Mortgage servicing rights. Loans and leases (includes $166 and $167, respectively, measured at fair value) Loans and leases Total Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss Fair Value, off-Balance-Sheet Risk [Table] Fair Value, off-Balance-Sheet Risk [Table] Included in earnings, location Fair Value, Net Derivative Asset (Liability), Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Loans held for sale Mortgages Held For Sale [Member] Mortgages Held For Sale [Member] Investments with Unrealized Losses by Investment Category Debt Securities, Available-for-Sale, Unrealized Loss Position, Fair Value [Table Text Block] Expiration Date Trading Arrangement Expiration Date RV and marine RV and Marine Finance Loan [Member] RV and Marine Finance Loan. Allowance related to investment securities Debt Securities, Held-to-Maturity, Allowance for Credit Loss, Excluding Accrued Interest Other investments Other Investments [Member] Unrealized (losses) gains on available-for-sale securities, net of hedges Other Comprehensive Income (Loss), Available-for-Sale Securities Adjustment, Net of Tax, Portion Attributable to Parent Premises and equipment Property, Plant and Equipment, Net Compensation Actually Paid vs. Net Income Compensation Actually Paid vs. Net Income [Text Block] Series A Non-Cumulative Perpetual Preferred Stock Series A Preferred Stock [Member] Entity Current Reporting Status Entity Current Reporting Status Receivables [Abstract] Receivables [Abstract] Derivative [Line Items] Derivative [Line Items] Awards Close in Time to MNPI Disclosures Awards Close in Time to MNPI Disclosures [Table] Interest rate contracts not designated as hedging instruments Interest Rate Derivative Instruments Not Designated as Hedging Instruments, Liability at Fair Value Consolidated Entities [Domain] Consolidated Entities [Domain] Under 1 year Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, Year One Veritex Shareholders Common Stock Veritex Shareholders Common Stock [Member] Veritex Shareholders Common Stock Investment Securities [Table] Investment Securities [Table] Investment Securities [Table] Financial Instrument [Axis] Financial Instrument [Axis] Statement of Financial Position [Abstract] Statement of Financial Position [Abstract] Executive Category: Executive Category [Axis] Over 12 Months, Gross Unrealized Losses Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss Derivative instruments Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] Net proceeds from issuance of long-term debt Proceeds from Issuance of Long-Term Debt Current Fiscal Year End Date Current Fiscal Year End Date Less than 12 Months, Gross Unrealized Losses Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss Finite-Lived Intangible Assets, Major Class Name [Domain] Finite-Lived Intangible Assets, Major Class Name [Domain] Total deposits Total deposits Deposits Deposits Loan and Lease Portfolio Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block] Professional services Professional Fees Derivative instruments not designated as hedging instruments, asset Derivative Instruments Not Designated as Hedging Instruments, Asset, at Fair Value Goodwill and other intangible assets Noncash or Part Noncash Acquisition, Intangible Assets Acquired Derivative liabilities Derivative liabilities, net Net amounts of liabilities presented in the unaudited consolidated balance sheets Derivative Liability Aging Analysis of Loans and Leases Aging analysis of loans and leases [Table Text Block] Aging analysis of loans and leases. Other noninterest expense Other Noninterest Expense Reclassification out of Accumulated Other Comprehensive Income [Domain] Reclassification out of Accumulated Other Comprehensive Income [Domain] Other agencies Other Federal Agencies [Member] Other Federal Agencies Member. Equity Awards Adjustments, Excluding Value Reported in Compensation Table Equity Awards Adjustments, Excluding Value Reported in the Compensation Table [Member] Less: amortization Amortization Method Qualified Affordable Housing Project Investments, Accumulated Amortization Amortization Method Qualified Affordable Housing Project Investments, Accumulated Amortization Loan Restructuring Modification [Axis] Loan Restructuring Modification [Axis] Pass Pass [Member] Interest rate contracts Interest Rate Contract [Member] Preferred stock, basis spread adjustment on variable rate Preferred Stock, Basis Spread Adjustment On Variable Rate Preferred Stock, Basis Spread Adjustment On Variable Rate Total, Gross Unrealized Losses Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss Assets and Liabilities Measured at Fair Value on a Recurring Basis Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] Other securities Fair Value Equity Securities, FV-NI, Current Issuance of stock, acquisition Stock Issued During Period, Value, Acquisitions Preliminary fair value of net assets acquired Business Combination, Recognized Asset Acquired to Liability Assumed, Excess (Less) Anti-dilutive awards (in shares) Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Credit risks from interest rate swaps used for trading purposes Credit risks from interest rate swaps used for trading purposes Credit risks from interest rate swaps used for trading purposes. Fair Value, by Balance Sheet Grouping [Table] Fair Value, by Balance Sheet Grouping [Table] Fair value of liabilities assumed Noncash or Part Noncash Acquisition, Value of Liabilities Assumed Net cash provided by financing activities Cash Provided by (Used in) Financing Activity, Including Discontinued Operation Measure: Measure [Axis] Valuation Approach and Technique [Axis] Valuation Approach and Technique [Axis] Derivative, fair value, net Derivative, Fair Value, Net Consumer Consumer Consumer Portfolio Segment [Member] Constant prepayment rate (annualized), 20% adverse change Sensitivity Analysis of Fair Value, Transferor's Interests in Transferred Financial Assets, Impact of 20 Percent Adverse Change in Prepayment Speed Pay vs Performance Disclosure, Table Pay vs Performance [Table Text Block] Forgone Recovery due to Violation of Home Country Law, Amount Forgone Recovery due to Violation of Home Country Law, Amount Non-cash activities Other Noncash Investing and Financing Items [Abstract] Entity Tax Identification Number Entity Tax Identification Number Discounted cash flow Valuation Technique, Discounted Cash Flow [Member] Summary of Key Assumptions and the Sensitivity of the Servicing Rights Value to Changes in the Assumptions Schedule of Sensitivity Analysis of Fair Value, Transferor's Interests in Transferred Financial Assets [Table Text Block] Other activity Goodwill, Other Increase (Decrease) Year four Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year, Writeoff Carrying Amount and Classification of the Trusts Assets and Liabilities Schedule of Variable Interest Entities [Table Text Block] Residential mortgage loans sold with servicing retained Loans with servicing retained sold Loans with servicing retained sold. Fixed Rate Subordinated Note Due January, 28 2041 Fixed Rate Subordinated Note Due January, 28 2041 [Member] Fixed Rate Subordinated Note Due January, 28 2041 Common shares issued (in shares) Common Stock, Shares, Issued Commercial MBS Commercial Mortgage-Backed Securities [Member] GOODWILL AND OTHER INTANGIBLE ASSETS Goodwill and Intangible Assets Disclosure [Text Block] Loans transferred to held-for-sale from portfolio Loan and Lease, Transfer from Held-in-Portfolio to Held-for-Sale Residential CMO Mortgage-Backed Security, Issued by US Government-Sponsored Enterprise [Member] Net gains (losses) on sales of securities Gains (Losses) on Sales of Securities [Member] Gains (Losses) on Sales of Securities Schedule of Goodwill Schedule of Goodwill [Table Text Block] Trading Arrangement: Trading Arrangement [Axis] Total Shareholder Return Amount Total Shareholder Return Amount Loss Contingencies [Line Items] Loss Contingencies [Line Items] Difference Fair Value, Option, Aggregate Differences, Loans and Long-Term Receivables Loan and lease charge-offs Financing Receivable, Excluding Accrued Interest, Allowance For Credit Loss, Writeoff, Including Writeoff From Acquisition Financing Receivable, Excluding Accrued Interest, Allowance For Credit Loss, Writeoff, Including Writeoff From Acquisition Treasury / Other Segment Reporting, Reconciling Item, Corporate Nonsegment [Member] Security Exchange Name Security Exchange Name Purchases of loans and leases Payments to Acquire Finance Receivables Leasing revenue Insurance Revenue [Member] Insurance Revenue [Member] Asset and Liability Derivatives Included in Accrued Income and Other Assets Asset and liability derivatives included in accrued income and other assets [Table Text Block] Asset and liability derivatives included in accrued income and other assets. Net proceeds from sales of loans and leases Proceeds from Sale, Loan, Held-for-Investment LOANS AND LEASES Financing Receivables [Text Block] Dividends on preferred shares Dividends, Preferred Stock Business Combination, Consideration Transferred, Equity Interest, Type [Domain] Business Combination, Consideration Transferred, Equity Interest, Type [Domain] Deferred origination costs Direct Financing Leases, Initial Direct Costs Remaining unamortized costs as of the balance sheet date that were essential to acquiring the lease, and that would not otherwise have been incurred without the lease agreement, including evaluating the lessee's credit condition, guarantees, and collateral and costs incurred negotiating, processing, and closing the lease agreement. Asset Class [Domain] Asset Class [Domain] Included in earnings Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings Statement [Line Items] Statement [Line Items] Rule 10b5-1 Arrangement Adopted Rule 10b5-1 Arrangement Adopted [Flag] Fair Value Measurement Inputs and Valuation Techniques [Table] Fair Value Measurement Inputs and Valuation Techniques [Table] Related loans serviced for third parties, unpaid principal balance, end of period Unpaid Principal Balance Of Third Party Serviced Loans Unpaid Principal Balance Of Third Party Serviced Loans Loans held for sale Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Loans Held for Sale Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Loans Held for Sale Common stock and equity-based awards issued Noncash Or Part Noncash Acquisition, Noncash Financial Or Equity Instrument Consideration, Equity Issued Noncash Or Part Noncash Acquisition, Noncash Financial Or Equity Instrument Consideration, Equity Issued Common Stock-Par Value $0.01 per share Common Stock Common Stock [Member] Trading liabilities Trading Liabilities Increase in cash and cash equivalents Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Period Increase (Decrease), Including Exchange Rate Effect and Discontinued Operation Dilutive potential common shares (in shares) Weighted Average Number of Shares Outstanding, Diluted, Adjustment Servicing Asset at Fair Value, Amount [Roll Forward] Servicing Asset at Fair Value, Amount [Roll Forward] ACL balance, end of period Financing Receivable, Allowance For Credit Loss And Off Balance Sheet, Credit Loss, Liability Financing Receivable, Allowance For Credit Loss And Off Balance Sheet, Credit Loss, Liability Statistical Measurement [Domain] Statistical Measurement [Domain] Premises and equipment Business Combination, Recognized Asset Acquired, Property, Plant, and Equipment Cadence acquisition: Business combination: Business Combination [Abstract] Underlying Asset Class [Axis] Underlying Asset Class [Axis] Amortized Cost Debt Securities, Available-for-Sale, Amortized Cost, Excluding Accrued Interest, before Allowance for Credit Loss Reported Value Measurement [Domain] Reported Value Measurement [Domain] [Domain] for Reported Value Measurement [Axis] Short-term borrowings Short-Term Debt, Fair Value Asset Class [Axis] Asset Class [Axis] Valuation Approach and Technique [Domain] Valuation Approach and Technique [Domain] Included in OCI Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) Bank-owned life insurance Bank Owned Life Insurance Basic earnings per common share: Earnings Per Share, Basic [Abstract] Preferred stock, variable rate basis spread Preferred Stock, Basis Spread On Variable Rate Preferred Stock, Basis Spread On Variable Rate Total held-to-maturity securities Debt Securities, Held-to-Maturity, Unrealized Loss Position, Fair Value Shares issued (in shares) Business Combination, Consideration Transferred, Equity Interest, Share Issued, Number of Shares Share issuance ratio Business Combination, Consideration Transferred, Equity Interests Issued and Issuable, Entity Shares Issued Per Acquiree Share Business Combination, Consideration Transferred, Equity Interests Issued and Issuable, Entity Shares Issued Per Acquiree Share Pledged Status [Axis] Pledged Status [Axis] Transfers into Level 3 Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Transfers into Level 3 Unrealized Gross Losses Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax Trading Arrangements, by Individual Trading Arrangements, by Individual [Table] Net income—basic (in usd per share) Basic earnings per common share (in usd per share) Earnings Per Share, Basic Summarizes Activity Relating to Loans Securitized Sold with Servicing Retained Activity Relating To Loans Securitized Sold With Servicing Retained [Table Text Block] activity relating to loans securitized sold with servicing retained. Liabilities measured at fair value on a recurring basis Liabilities, Fair Value Disclosure [Abstract] Accrued income and other assets Accrued income and other assets [Member] Accrued Income and other Assets. Cash dividend declared per share (in usd per share) Preferred Stock, Dividends Per Share, Declared Discount rate Measurement Input, Discount Rate [Member] Other comprehensive income (loss), net of tax Other comprehensive income (loss), net of tax Other Comprehensive Income (Loss), Net of Tax Collateral-dependent loans Impaired loans Fair Value Disclosure Impaired loans Fair Value Disclosure. Constant prepayment rate (annualized), actual Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value, Prepayment Speed Schedule of Segment Reporting Information, by Segment Schedule of Segment Reporting Information, by Segment [Table Text Block] Short-term borrowings Short-term borrowings Short-Term Debt Unrealized Gross Gains Debt Securities, Held-to-Maturity, Accumulated Unrecognized Gain Measurement Input Type [Domain] Measurement Input Type [Domain] Share issuance ratio Business Combination, Consideration Transferred, Equity Interests Issued And Issuable, Ratio Business Combination, Consideration Transferred, Equity Interests Issued And Issuable, Ratio Residential CMO Collateralized Mortgage Obligations [Member] Other noninterest income Other Noninterest Income [Member] Other Noninterest Income Change in unrealized gains (losses) for the period included in earnings for assets held at end of the reporting date Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) Total Loan and lease charge-offs Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff Award Timing MNPI Disclosure Award Timing MNPI Disclosure [Text Block] Preferred stock, convertible, conversion ratio Preferred Stock, Convertible, Conversion Ratio Summarizes Activity Relating to Loans Sold with Servicing Retained Using the Fair Value Method Schedule of Servicing Assets at Fair Value [Table Text Block] Taxable Interest Income, Securities, Operating, Taxable Consolidated VIE Variable Interest Entity, Primary Beneficiary [Member] Trading account securities Debt Securities, Trading, and Equity Securities, FV-NI Accounts and Financing Receivables [Table] Accounts and Financing Receivables [Table] Carrying value of assets pledged as collateral against repurchase agreements Securities Sold under Agreements to Repurchase, Fair Value of Collateral Derivative Instruments, Gain (Loss) [Line Items] Derivative Instruments, Gain (Loss) [Line Items] Hedging Designation [Domain] Hedging Designation [Domain] Goodwill and Intangible Assets Disclosure [Abstract] Goodwill and Intangible Assets Disclosure [Abstract] Increase or (Decrease) to Interest Expense for Derivatives Designated as Fair Value Hedges Increase or decrease to interest expense for derivatives designated as fair value hedges [Table Text Block] The increase or (decrease) to interest expense for derivatives designated as fair value (FV) hedges. Loans held for sale (includes $1,068 and $885, respectively, measured at fair value) Loans held for sale Financing Receivable, Held-for-Sale, Not Part of Disposal Group, after Valuation Allowance Total liabilities and equity Liabilities and Equity Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Unrealized losses for pension and other post-retirement obligations Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] Issuance of stock, acquisition (in shares) Stock Issued During Period, Shares, Acquisitions Derivative Instruments, Gain (Loss) [Table] Derivative Instruments, Gain (Loss) [Table] Veritex Holdings, Inc. Veritex Holdings, Inc. [Member] Veritex Holdings, Inc. Offsetting Derivative Assets [Abstract] Offsetting Derivative Assets [Abstract] Credit Derivative [Table] Credit Derivative [Table] Gross amounts not offset in the condensed consolidated balance sheets, Financial instruments Derivative Asset, Subject to Master Netting Arrangement, Collateral, Obligation to Return Security Not Offset Time decay Time decay Time decay. Deposits Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deposits Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deposits Treasury Stock Treasury Stock, Common [Member] Allowance on purchased seasoned loans and leases at acquisition Financing Receivable, Allowance For Credit Loss, Purchased Seasoned Loan Financing Receivable, Allowance For Credit Loss, Purchased Seasoned Loan Year one Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year Pay vs Performance Disclosure [Line Items] Translation adjustments, net of hedges Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Portion Attributable to Parent 90 or  more days Financial Asset, Equal to or Greater than 90 Days Past Due [Member] Redemption price (per share) Preferred Stock, Liquidation Preference Per Share Liabilities Liabilities Liabilities [Abstract] BUSINESS COMBINATIONS Business Combination [Text Block] Automobile Automobile Loan [Member] Level 3 Assets Roll Forward: Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] Variable Interest Entity [Table] Variable Interest Entity [Table] Year three Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Company Selected Measure Amount Company Selected Measure Amount Prior Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year, Writeoff Other liabilities Increase (Decrease) in Other Noncurrent Liabilities Liabilities, Amortized Cost Financial Liability, Closed Portfolio, Portfolio Layer Method, Amortized Cost Financial Liability, Closed Portfolio, Portfolio Layer Method, Amortized Cost Included in earnings, location Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Comprehensive income attributable to Huntington Comprehensive Income (Loss), Net of Tax, Attributable to Parent Measurement Input Type [Axis] Measurement Input Type [Axis] Name Measure Name Under 1 year Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, Year One Auto Loan Securitization Trust Secured Debt [Member] Schedule of investment securities and other securities [Line Items] Schedule of investment securities and other securities [Line Items] [Line Items] for Schedule of investment securities and other securities [Table] Increase in deposits Increase (Decrease) in Deposits Maturities and calls of available-for-sale securities Proceeds from Maturities, Prepayments and Calls of Debt Securities, Available-for-Sale Class of Stock [Line Items] Class of Stock [Line Items] Credit Linked Notes Unsecured debt Unsecured Debt [Member] Amortized Cost, Fair Value, and Gross Unrealized Gains and Losses by Investment Category Unrealized Gain (Loss) on Investments [Table Text Block] Included in OCI Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Gain (Loss) Included in Other Comprehensive Income (Loss) Gross amounts offset in the unaudited consolidated balance sheets Derivative liabilities, netting adjustments Derivative Liability, Subject to Master Netting Arrangement, Gross Asset and Collateral, Right to Reclaim Cash, Offset Components of Other Comprehensive Income Comprehensive Income (Loss) [Table Text Block] Long-term debt Long-term borrowings Long-Term Debt Legal Entity [Axis] Legal Entity [Axis] Total assets Total Assets Assets Assets Loans held for investment Loans held for investment Mortgages Held To Maturity [Member] Mortgages Held To Maturity [Member] Financing Receivable, Credit Quality Indicator [Line Items] Financing Receivable, Credit Quality Indicator [Line Items] Financing Receivable, Allowance for Credit Loss [Roll Forward] Financing Receivable, Allowance for Credit Loss [Roll Forward] Investment securities pledged Debt Securities Operating activities Cash Provided by (Used in) Operating Activity, Including Discontinued Operation [Abstract] VARIABLE INTEREST ENTITIES Organization, Consolidation and Presentation of Financial Statements Disclosure and Significant Accounting Policies [Text Block] Loans held for investment, aggregate unpaid principal Mortgages Held To Maturity Unpaid Principal Mortgages Held To Maturity Unpaid Principal Repayments Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Repayments Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Repayments. 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Residential mortgage Residential mortgage Residential Mortgage [Member] Fair value of tangible assets acquired Noncash or Part Noncash Acquisition, Value of Assets Acquired Future lease rental payments due on sales-type and direct financing leases, year five Sales-Type and Direct Financing Leases, Payment to be Received, Year Five PEO PEO [Member] FHLB stock Investment in Federal Home Loan Bank Stock [Member] Transfers into Level 3 Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3 Investments by Contractual Maturity Investments Classified by Contractual Maturity Date [Table Text Block] Trading account securities Debt Securities, Trading Spread over forward interest rate swap rates, 10% adverse change Sensitivity Analysis of Fair Value, Transferor's Interests in Transferred Financial Assets, Impact of 10 Percent Adverse Change in Discount Rate Commercial Banking Commercial Banking Commercial Banking [Member] Commercial Banking. Net change in: Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity, Increase (Decrease) in Operating Capital [Abstract] PCD loans Financial Asset Acquired with Credit Deterioration [Member] Interest rate contracts designated as hedging instruments Interest Rate Fair Value Hedge Asset at Fair Value Retained Earnings Retained Earnings [Member] Fair value hedging adjustments Fair value hedging adjustments Fair value hedging adjustments Cash and cash equivalents at beginning of period Cash and cash equivalents at end of period Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation Income Statement [Abstract] Income Statement [Abstract] Derivative assets Derivative assets, net Net amounts of
assets
presented in
the unaudited
consolidated
balance sheets Derivative Asset Over 12 Months, Fair Value Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer Not Designated as Hedging Instrument, Economic Hedge Not Designated as Hedging Instrument, Economic Hedge [Member] Nonrecurring Basis Fair Value, Nonrecurring [Member] Proceeds from: Proceeds from Sale and Maturity of Debt Securities, Available-for-Sale [Abstract] Underlying Liability Class [Domain] Underlying Liability Class [Domain] Underlying Liability Class [Domain] Capital markets and advisory fees Capital Market Fees [Member] Capital Market Fees [Member] Financing Receivable, Modified [Table] Financing Receivable, Modified [Table] Provision (benefit) for unfunded lending commitments Off-Balance-Sheet, Credit Loss, Liability, Credit Loss Expense (Reversal) Product and Service [Domain] Product and Service [Domain] Available-for-sale securities: Debt Securities, Available-for-Sale [Abstract] Other share-based compensation activity Shares Issued, Value, Other Share-Based Payment Arrangement, After Forfeiture Shares Issued, Value, Other Share-Based Payment Arrangement, After Forfeiture Transfers out of Level 3 Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Transfers out of Level 3 Future lease rental payments due on sales-type and direct financing leases, year two Sales-Type and Direct Financing Leases, Payment to be Received, Year Two Huntington Shareholders’ Equity Parent [Member] Income after income taxes Net income Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Restatement does not require Recovery Restatement Does Not Require Recovery [Text Block] Business Combination [Table] Business Combination [Table] Notional Value Derivative, Notional Amount Business Combination, Consideration Transferred, Equity Interest, Type [Axis] Business Combination, Consideration Transferred, Equity Interest, Type [Axis] Organization, Consolidation and Presentation of Financial Statements [Abstract] Organization, Consolidation and Presentation of Financial Statements [Abstract] Series H Series H Preferred Stock [Member] Revolver Total at Amortized Cost Basis Financing Receivable, Excluding Accrued Interest, Revolving Future lease rental payments due on sales-type and direct financing leases Sales-Type and Direct Financing Leases, Payment to be Received City Area Code City Area Code Allowance Roll-forward Financing Receivable, Allowance for Credit Loss [Table Text Block] Award Timing, How MNPI Considered Award Timing, How MNPI Considered [Text Block] Investing activities Cash Provided by (Used in) Investing Activity, Including Discontinued Operation [Abstract] Pay vs Performance Disclosure Pay vs Performance Disclosure [Table] Fair Value Hedges Fair Value Hedging [Member] Servicing Asset at Fair Value, Activity [Table] Servicing Asset at Fair Value, Activity [Table] Cash Flow Hedges Cash Flow Hedging [Member] Other liabilities Other liabilities Other Liabilities Goodwill Preliminary goodwill Balance, December 31, 2025 Balance, March 31, 2026 Goodwill Estimate of possible loss Loss Contingency, Estimate of Possible Loss Equity contracts Equity Contract [Member] Proportional Amortization Method Proportional Amortization Method [Member] Proportional Amortization Method Member. 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Credit Loss Status [Axis] Credit Loss Status [Axis] Entity [Domain] Entity [Domain] Net cash used in investing activities Cash Provided by (Used in) Investing Activity, Including Discontinued Operation Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table [Member] Bond expiration period Standby Bond Purchase Commitment, Expiration Period Interest paid Interest Paid, Excluding Capitalized Interest, Operating Activity Document Fiscal Year Focus Document Fiscal Year Focus Servicing Assets at Fair Value [Line Items] Servicing Assets at Fair Value [Line Items] Premium/(discount) Financing Receivable, Unamortized Purchase Premium (Discount) Reported Value Measurement Reported Value Measurement [Member] Acquisition-related expenses Business Combination, Acquisition-Related Cost, Expense Equity [Abstract] Equity [Abstract] Total nonaccrual loans and leases Financing Receivable, Nonaccrual Underlying Liability Class [Axis] Underlying Liability Class [Axis] Underlying Liability Class Accrued interest receivable on HTM securities Debt Securities, Held-to-Maturity, Accrued Interest, after Allowance for Credit Loss Net gains on sales of securities Debt and Equity Securities, Gain (Loss) SEGMENT REPORTING Segment Reporting Disclosure [Text Block] Goodwill [Table] Goodwill [Table] Derivatives not designated as Hedging Instruments Not Designated as Hedging Instrument [Member] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] U.S. Treasury US Treasury Securities [Member] Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Outside data processing and other services Information Technology and Data Processing Finite-Lived Intangible Assets [Line Items] Finite-Lived Intangible Assets [Line Items] Segment Disclosure of Assets and Deposits Segment Disclosure Of Assets And Deposits [Table Text Block] Segment disclosure of assets and deposits. Purchases/originations Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Purchases Cumulative Amount of Fair Value Hedging Adjustment To Hedged Items Hedged Liability, Fair Value Hedge, Portfolio Layer Method, Hedged Layer, Fair Value, Cumulative Increase (Decrease) Hedged Liability, Fair Value Hedge, Portfolio Layer Method, Hedged Layer, Fair Value, Cumulative Increase (Decrease) Other securities/sovereign debt Other Debt Obligations [Member] Other liabilities Business Combination, Recognized Liability Assumed, Other Liability, Noncurrent Net change related to cash flow hedges on loans Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax, Parent Compensation Actually Paid vs. Total Shareholder Return Compensation Actually Paid vs. Total Shareholder Return [Text Block] Held-to-maturity securities, fair value: Debt Securities, Held-to-Maturity, Fair Value, Rolling Maturity [Abstract] OTHER COMPREHENSIVE INCOME Comprehensive Income (Loss) Note [Text Block] Fair Value, Recurring and Nonrecurring [Table] Fair Value, Recurring and Nonrecurring [Table] Weighted average Weighted Average [Member] Amortization of intangibles Amortization of Intangible Assets Estimated residual value of leased assets Direct Financing Lease, Unguaranteed Residual Asset Debt securities, available-for-sale, measurement input Debt Securities, Available-for-Sale, Measurement Input Activity in Accumulated Other Comprehensive Income, Net of Tax Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] Lower of Cost or Market LowerOfCostOrMarket [Member] Lower of cost or market Collateral-dependent loans, gains (losses) Impaired Loans, Fair Value Disclosure, Gains (Losses) Impaired Loans, Fair Value Disclosure, Gains (Losses) Pretax Other Comprehensive Income (Loss), before Tax [Abstract] Residential MBS Residential Mortgage-Backed Securities [Member] Number of primary groups Derivative, Number Of Primary Groups Entered Into Derivative Transactions Derivative, Number Of Primary Groups Entered Into Derivative Transactions Arrangement Duration Trading Arrangement Duration Segments [Axis] Segments [Axis] Local Phone Number Local Phone Number Additional 402(v) Disclosure Additional 402(v) Disclosure [Text Block] Other, net Payment for (Proceeds from) Other Investing Activity Series F Series F Preferred Stock [Member] Repurchases of common stock (in shares) Stock Repurchased and Retired During Period, Shares 750+ FICO Score, Greater than 750 [Member] FICO Score, Greater than 750 [Member] Cash and due from banks Business Combination, Recognized Asset Acquired, Cash and Cash Equivalent AULC balance, beginning of period AULC balance, end of period Off-Balance-Sheet, Credit Loss, Liability Assets Assets Assets [Abstract] Underlying Security Market Price Change Underlying Security Market Price Change, Percent Debt Instrument [Axis] Debt Instrument [Axis] Interest-bearing Interest-Bearing Deposit Liabilities, Domestic FAIR VALUES OF ASSETS AND LIABILITIES Fair Value Disclosures [Text Block] Business Combination [Line Items] Business Combination [Line Items] Shareholders’ equity Equity, Attributable to Parent [Abstract] Summary of Modifications Financing Receivable, Modified [Table Text Block] Carrying amount of deferred revenue associated with guarantees Deferred Revenue Debt stated interest rate Debt Instrument, Interest Rate, Stated Percentage 30-59 Days Financial Asset, 30 to 59 Days Past Due [Member] Schedule of Financing Receivables Purchased With Credit Deterioration Schedule Of Financing Receivables Purchased Seasoned Loans [Table Text Block] Schedule Of Financing Receivables Purchased Seasoned Loans Other securities/sovereign debt Other Securities [Member] Other securities. Gross amounts of recognized assets Derivative assets, gross Total contracts Derivative Asset, Subject to Master Netting Arrangement, before Offset Depreciation, amortization, and accretion Depreciation, Amortization and Accretion, Net Held-to-maturity securities—taxable Interest Income, Debt Securities, Held-to-Maturity Increase (decrease) to net interest income due to derivative adjustment Increase decrease to net interest income due to derivative adjustment Increase (decrease) to net interest income due to derivative adjustment. Entity Registrant Name Entity Registrant Name Net losses recognized in AOCI expected to be reclassed Cash Flow Hedge Gain (Loss) to be Reclassified within 12 Months Stock Price or TSR Estimation Method Stock Price or TSR Estimation Method [Text Block] Municipal securities Municipal Bonds [Member] Lease financing equipment depreciation Depreciation, Nonproduction Deposits: Deposits [Abstract] Total Financial Asset, Past Due [Member] Investment securities and other securities disclosure [Table] Investment securities and other securities disclosure [Table] Investment securities and other securities disclosure [Table] Assets held in trust for deferred compensation plans Asset, Held-in-Trust Fair value, beginning of period Fair value, end of period MSRs Servicing Asset at Fair Value, Amount Acquired unfunded lending commitments Off-Balance-Sheet, Credit Loss, Liability, Acquired During Period Off-Balance-Sheet, Credit Loss, Liability, Acquired During Period Less than 12 Months, Fair Value Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value Schedule of Finite-Lived Intangible Assets Schedule of Finite-Lived Intangible Assets [Table Text Block] Restatement Determination Date: Restatement Determination Date [Axis] Maturity term Securities Sold under Agreements to Repurchase, Term Securities Sold under Agreements to Repurchase, Term Accumulated Other Comprehensive Income (Loss) [Table] Accumulated Other Comprehensive Income (Loss) [Table] Other, net Proceeds from (Payment for) Other Financing Activity Liabilities assumed Business Combination, Recognized Liability Assumed, Liability [Abstract] Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax Amounts reclassified from AOCI to earnings Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax Time deposits in excess of the FDIC insurance coverage limit Time Deposit Liability, above US Insurance Limit Name Trading Arrangement, Individual Name Underlying Asset Class [Domain] Underlying Asset Class [Domain] Cash dividends declared: Dividends, Cash [Abstract] Short-Term Debt [Table] Short-Term Debt [Table] Loans held for sale, fair value Loans held for sale Loan, Held-for-Sale, Fair Value Disclosure Foreign exchange contracts not designated as hedging instruments Foreign Currency Derivative Instruments Not Designated as Hedging Instruments, Liability at Fair Value Debt face amount Debt Instrument, Face Amount Notional Disclosures [Abstract] Notional Disclosures [Abstract] Statement of Comprehensive Income [Abstract] Statement of Comprehensive Income [Abstract] Veritex and Cadence Veritex And Cadence [Member] Veritex And Cadence Fair value of equity interests Business Combination, Consideration Transferred, Equity Interest Preferred Stock Preferred Stock [Member] Name Awards Close in Time to MNPI Disclosures, Individual Name Reported Value Measurement [Axis] Reported Value Measurement [Axis] Reported Value Measurement [Axis] Bank-owned life insurance Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Bank Owned Life Insurance Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Bank Owned Life Insurance Total gains (losses) for the period: Fair Value Assets Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Calculation Roll Forward [Abstract] Fair Value Assets Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Calculation Roll Forward. Aggregate Erroneous Compensation Not Yet Determined Aggregate Erroneous Compensation Not Yet Determined [Text Block] Credit Loss [Abstract] Credit Loss [Abstract] Conversion of equity awards Stock Issued During Period, Value, Conversion of Convertible Securities Available-for-sale securities, fair value: Debt Securities, Available-for-Sale, Maturity, Fair Value, Rolling Maturity [Abstract] Recognition of the fair value of share-based compensation APIC, Share-Based Payment Arrangement, Increase for Cost Recognition Net accrued income and other receivables activity Payments for (Proceeds from) Interest Receivables and Other Receivables Activity Payments for (Proceeds from) Interest Receivables and Other Receivables Activity OCI before reclassification, tax (expense) benefit Other Comprehensive Income (Loss) before Reclassifications, Tax Unrealized Gross Gains Equity Securities, FV-NI, Accumulated Gross Unrealized Gain, before Tax Equity Securities, FV-NI, Accumulated Gross Unrealized Gain, before Tax MSR Derivative Hedging MSR Derivative Hedging [Table Text Block] [Table Text Block] for MSR Derivative Hedging [Table] Segments [Domain] Segments [Domain] Credit Loss Status [Domain] Credit Loss Status [Domain] Statement of Income Location, Balance [Axis] Statement of Income Location, Balance [Axis] Servicing assets obtained in acquisition Servicing Asset at Fair Value, Other Changes that Affect Balance INVESTMENT SECURITIES AND OTHER SECURITIES Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block] Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] FRB stock Investment in Federal Reserve Stock [Member] This item represents the amount shown on an entity's books for investments in Federal Reserve Stock. Statement of Financial Position Location, Balance [Domain] Statement of Financial Position Location, Balance [Domain] ACCOUNTING STANDARDS UPDATE Accounting Standards Update and Change in Accounting Principle [Table Text Block] Gross amounts not offset in the condensed consolidated balance sheets, Cash collateral received Derivative Asset, Subject to Master Netting Arrangement, Collateral, Obligation to Return Cash Not Offset Unrealized gains and (losses) on debt securities Unrealized gains (losses) on available-for-sale securities, net of hedges AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-Sale, Parent [Member] Interest expense: Interest Expense, Operating and Nonoperating [Abstract] Senior Notes Senior Notes [Member] Purchases of available-for-sale securities Payments to Acquire Debt Securities, Available-for-Sale Preferred stock Preferred Stock, Value, Issued Year two Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year Total liabilities assumed Business Combination, Recognized Liability Assumed, Liability Subordinated Notes Subordinated Debt [Member] Financial Asset, Period Past Due [Axis] Financial Asset, Aging [Axis] All Executive Categories All Executive Categories [Member] Subordinated notes Subordinated Notes [Member] Subordinated notes. Common stock Common Stock, Value, Issued Loans and leases Interest and Fee Income, Loans and Leases Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table] Commitments and Contingent Liabilities (Note 17) Commitments and Contingencies Year one Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year, Writeoff Net cash and cash equivalents received from business combinations Cash Acquired from Acquisition Other non-marketable equity securities Equity Securities, At Cost [Member] Equity Securities, At Cost Servicing rights and other intangible assets Business Combination, Recognized Asset Acquired, Identifiable Intangible Asset, Finite-Lived Conversion of Certain Veritex Equity Awards Conversion Of Certain Veritex Equity Awards [Member] Conversion Of Certain Veritex Equity Awards Business Combination [Axis] Business Combination [Axis] Comprehensive income Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest Loans Loans Payable [Member] Other securities Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other securities Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other securities Non-controlling Interest Noncontrolling Interest [Member] Repayments Fair Value, Net Derivative Asset (Liability) Measured On Recurring Basis, Unobservable Inputs Reconciliation, Repayments Fair Value, Net Derivative Asset (Liability) Measured On Recurring Basis, Unobservable Inputs Reconciliation, Repayments Short-term Debt [Line Items] Short-Term Debt [Line Items] PEO Actually Paid Compensation Amount PEO Actually Paid Compensation Amount After 10 years Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 10 Diluted earnings per common share: Earnings Per Share, Diluted [Abstract] 60-89  Days Financial Asset, 60 to 89 Days Past Due [Member] Revenue from Contract with Customer [Abstract] Revenue from Contract with Customer [Abstract] Hedging Designation [Axis] Hedging Designation [Axis] Other Other Interest and Dividend Income Fair value method Sensitivity Analysis Fair Value Carrying Method [Member] Sensitivity Analysis for servicing rights carried at fair value Net amount Derivative Liability, Including Not Subject to Master Netting Arrangement, after Offset and Deduction Derivative Contract [Domain] Derivative Contract [Domain] Debt Instruments [Abstract] After 10 years Debt Securities, Held-to-Maturity, Amortized Cost Excluding Accrued Interest, after Allowance for Credit Loss, Maturity, Allocated and Single Maturity Date, after Year 10 All Individuals All Individuals [Member] Long-term Debt, Type [Domain] Long-Term Debt, Type [Domain] Fair Value Disclosures [Abstract] Fair Value Disclosures [Abstract] Purchases of premises and equipment Payments to Acquire Property, Plant, and Equipment Name Forgone Recovery, Individual Name Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested [Member] Reclassification out of Accumulated Other Comprehensive Income Reclassification out of Accumulated Other Comprehensive Income [Member] Securities sold under agreements to repurchase Securities Sold under Agreements to Repurchase [Member] Weighted average rate Debt, Weighted Average Interest Rate Nonaccrual loans and leases with no ACL Financing Receivable, Nonaccrual, No Allowance Maturities and calls of other securities Proceeds from Maturities, Prepayments and Calls of Other Investments Year five Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year, Writeoff Customer deposit and loan fees Customer Deposit and Loan Fees [Member] Customer Deposit and Loan Fees Erroneous Compensation Analysis Erroneous Compensation Analysis [Text Block] Intangible Asset, Finite-Lived [Table] Intangible Asset, Finite-Lived [Table] Total, Gross Unrealized Losses Debt Securities, Held-to-Maturity, Unrealized Loss Position, Accumulated Loss Amounts Recorded on the Balance Sheet Related to Cumulative Basis Adjustments Schedule of Fair Value Hedging Instruments, Statements of Financial Performance and Financial Position, Location [Table Text Block] Commercial Commercial and industrial Commercial Portfolio Segment [Member] Rule 10b5-1 Arrangement Terminated Rule 10b5-1 Arrangement Terminated [Flag] Change in accumulated unrealized losses for pension and other post-retirement obligations Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax and Reclassification Adjustment, Attributable to Parent Pro forma revenue Business Combination, Pro Forma Information, Pro Forma Revenue Erroneously Awarded Compensation Recovery Erroneously Awarded Compensation Recovery [Table] Investment Securities Investment Securities [Member] Investment Securities Other noninterest expense, including corporate allocations Other Noninterest Expense Including Corporate Allocations Other Noninterest Expense Including Corporate Allocations Title of 12(b) Security Title of 12(b) Security Provision for loan and lease losses Financing Receivable, Excluding Accrued Interest, Credit Loss Expense (Reversal) Other noninterest income and other noninterest expense Other Expense [Member] Investment securities and other securities disclosure [Line Items] Investment securities and other securities disclosure [Line Items] [Line Items] for Investment securities and other securities disclosure [Table] Equipment Equipment Expense Gross investment in lease financing receivables Direct Financing Lease, Gross Investment In Direct Financing Leases Direct Financing Lease, Gross Investment In Direct Financing Leases Per common share: Earnings Per Share [Abstract] Earnings Per Share [Abstract] Change in unrealized gains (losses) for the period included in earnings for assets held at end of the reporting date Fair Value, Net Derivative Asset (Liability), Recurring Basis, Still Held, Unrealized Gain (Loss) Year three Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year, Writeoff Short-term Debt, Type [Axis] Short-Term Debt, Type [Axis] Interest expense subordinated notes and other long term debt Interest expense subordinated notes and other long term debt [Member] Interest expense subordinated notes and other long term debt member. Payments and cash management revenue Payments And Cash Management Revenue [Member] Cards And Payment Processing Revenue [Member] Reference pool Fair Value, Option, Credit Risk, Mitigation Loss Reference Pool, Amount Fair Value, Option, Credit Risk, Mitigation Loss Reference Pool, Amount Average dilutive potential common shares: Weighted Average Number of Shares Outstanding, Diluted, Adjustment [Abstract] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] Total servicing, late, and other ancillary fees Contractually Specified Servicing Fee, Late Fee, and Ancillary Fee Earned in Exchange for Servicing Financial Asset Award Timing Disclosures [Line Items] Interest-earning deposits with banks Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Interest Bearing Deposits in Banks Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Interest Bearing Deposits in Banks Servicing Asset at Amortized Cost [Line Items] Servicing Asset at Amortized Cost [Line Items] Measurement Frequency [Domain] Measurement Frequency [Domain] FHLB advances FHLB Advances Federal Home Loan Bank Advances [Member] Unrealized gains (losses) on available-for-sale securities arising during the period, net of hedges Other comprehensive income (loss) before reclassifications Other Comprehensive Income (Loss), before Reclassifications, Net of Tax Residential mortgage Residential Loan [Member] Residential Loan [Member] SHAREHOLDERS' EQUITY Equity [Text Block] Change in fair value for derivatives designated as fair value hedges Increase (Decrease) in Fair Value of Hedged Item in Interest Rate Fair Value Hedge Loan Restructuring Modification [Domain] Loan Restructuring Modification [Domain] Net loans and leases Net loans and leases Net loans and leases Financing Receivable, Excluding Accrued Interest, after Allowance for Credit Loss Net income attributable to Huntington Net income attributable to Huntington Net Income (Loss) Attributable to Parent Pretax gains resulting from above loan sales Gain (Loss) on Sale of Mortgage Loans Segment Reporting Information [Line Items] Segment Reporting Information [Line Items] Noninterest income within the scope of other GAAP topics Revenue Not from Contract with Customer Preferred stock, authorized shares (in shares) Preferred Stock, Shares Authorized Repurchases of common stock Payments for Repurchase of Common Stock Adoption Date Trading Arrangement Adoption Date Held-to-maturity securities, amortized cost: Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Rolling Maturity [Abstract] Offsetting of Financial Liabilities and Derivative Liabilities Offsetting Liabilities [Table Text Block] Retained earnings Retained Earnings (Accumulated Deficit) Consumer & Regional Banking Consumer & Regional Banking Consumer And Business Banking [Member] Consumer And Business Banking Member. Remaining maturity Derivative, Remaining Maturity Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested [Member] Huntington National Bank Unsecured Notes Maturing May 20, 2032 Huntington National Bank Unsecured Notes Maturing May 20, 2032 [Member] Huntington National Bank Unsecured Notes Maturing May 20, 2032 Spread over forward interest rate swap rates, actual Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value, Discount Rate Changes in valuation inputs or assumptions Servicing Asset at Fair Value, Changes in Fair Value Resulting from Changes in Valuation Inputs or Changes in Assumptions Purchases of held-to-maturity securities Payments to Acquire Held-to-Maturity Securities Class of Stock [Axis] Class of Stock [Axis] Net change related to cash flow hedges on loans Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member] Derivative used in trading activity Derivative used in trading activity [Member] Derivative used in trading activity. Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table [Member] Credit Derivatives [Line Items] Credit Derivatives [Line Items] Statement [Table] Statement [Table] Business Combination Business Combination [Table Text Block] Deferred income tax benefit Deferred Income Tax Expense (Benefit) Adjustments to reconcile net income to net cash provided by operating activities: Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity [Abstract] Financing activities Cash Provided by (Used in) Financing Activity, Including Discontinued Operation [Abstract] Hedged investment securities Hedged investment securities [Member] Hedged investment securities Assets held in trust for deferred compensation plans Restricted Assets, Fair Value Disclosure Restricted Assets, Fair Value Disclosure BASIS OF PRESENTATION Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block] Trading account securities Increase (Decrease) in Debt Securities, Trading, and Equity Securities, FV-NI Rollforward of Financial Instruments Measured on a Recurring Basis and Classified as Level 3 Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block] All Adjustments to Compensation All Adjustments to Compensation [Member] Interest rate reduction Contractual Interest Rate Reduction [Member] Amendment Flag Amendment Flag Accrued interest receivable on AFS securities Debt Securities, Available-for-Sale, Accrued Interest, after Allowance for Credit Loss Transfers and Servicing [Abstract] Transfers and Servicing [Abstract] Less treasury shares, at cost Treasury Stock, Common, Value Future lease rental payments due on sales-type and direct financing leases, year one Sales-Type and Direct Financing Leases, Payment to be Received, Year One Termination Date Trading Arrangement Termination Date Interest-earning deposits with banks Interest-Bearing Deposits in Banks and Other Financial Institutions Insider Trading Policies and Procedures Adopted Insider Trading Policies and Procedures Adopted [Flag] Allowance for loan and lease losses ALLL balance, beginning of period ALLL balance, end of period Allowance for loan and lease losses Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest Under 1 year Debt Securities, Held-to-Maturity, Amortized Cost Excluding Accrued Interest, after Allowance for Credit Loss, Maturity, Allocated and Single Maturity Date, Year One Average common shares—basic (in shares) Average common shares issued and outstanding (in shares) Weighted Average Number of Shares Outstanding, Basic Basic and Diluted Earnings Per Share Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Segment Reporting [Abstract] Segment Reporting [Abstract] Debt Disclosure [Abstract] Debt Disclosure [Abstract] Reclassification from AOCI, Current Period, Tax Reclassification from AOCI, Current Period, Tax Trust preferred securities Trust Preferred Securities [Member] Trust Preferred Securites [Member]. Investment Securities [Line Items] Investment Securities [Line Items] [Line Items] for Investment Securities [Table] Offsetting Derivative Liabilities [Abstract] Offsetting Derivative Liabilities [Abstract] Forgone Recovery due to Expense of Enforcement, Amount Forgone Recovery due to Expense of Enforcement, Amount Consolidated Entities [Axis] Consolidated Entities [Axis] Common stock, par value (in usd per share) Common Stock, Par or Stated Value Per Share Other securities Other Securities, Only Measured At Fair Value Other Securities, Only Measured At Fair Value Derivative Instruments and Hedging Activities Disclosures [Line Items] Derivative Instruments and Hedging Activities Disclosures [Line Items] Wealth and asset management revenue Trust And Investment Management Services Revenue [Member] Trust And Investment Management Services Revenue [Member] Settlements Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements Cadence Cadence Bank [Member] Cadence Bank Net occupancy Occupancy, Net Available-for-sale securities Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Available for sale securities Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Available for sale securities Insider Trading Arrangements [Line Items] Prior Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year Current Financial Asset, Not Past Due [Member] Allowance related to investment securities, available for sale securities Debt Securities, Available-for-Sale, Allowance for Credit Loss, Excluding Accrued Interest Equity securities Equity Securities [Member] Total liabilities Total Liabilities Liabilities Antidilutive Securities, Name [Domain] Antidilutive Securities, Name [Domain] Settlements Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Settlements Assets, Amortized Cost Financial Asset, Closed Portfolio, Portfolio Layer Method, Amortized Cost % of total loan class Financing Receivable, Excluding Accrued Interest, Modified in Period, to Total Financing Receivables, Percentage Series G Series G Preferred Stock [Member] Pension Adjustments Prior Service Cost Pension Adjustments Prior Service Cost [Member] Material Terms of Trading Arrangement Material Terms of Trading Arrangement [Text Block] Fixed-to-Floating Senior Notes Due April 12, 2028 Fixed-to-Floating Senior Notes Due April 12, 2028 [Member] Fixed-to-Floating Senior Notes Due April 12, 2028 Other (in shares) Stockholders' Equity, Other Shares Gross amounts not offset in the condensed consolidated balance sheets, Financial instruments Derivative Liability, Subject to Master Netting Arrangement, Collateral, Right to Reclaim Security Not Offset Long-term debt Business Combination, Recognized Liability Assumed, Long-Term Debt, Noncurrent Asset-backed securities Asset-Backed Securities [Member] Consolidation Items [Axis] Consolidation Items [Axis] Assets Measured at Fair Value on a Nonrecurring Basis Fair Value, Assets and Liabilities Measured on Nonrecurring Basis, Valuation Techniques [Table Text Block] Maturities and calls of held-to-maturity securities Proceeds from Maturities, Prepayments and Calls of Held-to-Maturity Securities Amortized Cost Debt Securities, Held-to-Maturity, Excluding Accrued Interest, after Allowance for Credit Loss Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Non-NEOs Non-NEOs [Member] Corporate debt Corporate Debt Securities [Member] Net loan and lease activity, excluding sales and purchases Payments for (Proceeds from) Other Loans and Leases Deferred fees, unearned income, and other Direct Financing Lease, Deferred Selling Profit Investment securities and cash collateral pledged by Huntington Collateral Already Posted, Aggregate Fair Value Secured Overnight Financing Rate (SOFR) [Member]