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This concept represents the carrying amount of assets related to these investment structures. 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Entity Emerging Growth Company Entity Emerging Growth Company 2028 Long-Term Debt, Maturity, Year Three Redemptions Payments For Redemption Of Preferred Stock Payments For Redemption Of Preferred Stock Finance leases, a weighted-average remaining lease term Finance Lease, Weighted Average Remaining Lease Term Derivative, collateral, right to reclaim cash Derivative Liability, Subject to Master Netting Arrangement, Collateral, Right to Reclaim Cash Not Offset Capital One Financial Corporation (Parent Company Only) Condensed Financial Information of Parent Company Only Disclosure [Text Block] 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] Reserve for unfunded lending commitments Unfunded Loan Commitment [Member] Restricted cash for securitization investors Restricted Cash and Cash Equivalent Other intangible assets (indefinite lived): 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Businesses, Net of Cash Acquired Buildings and improvements Building and Building Improvements [Member] U.S. federal Income Tax Paid, Federal, after Refund Received 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] Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] Lieu of Fractional Shares Lieu of Fractional Shares [Member] Lieu of Fractional Shares Preferred stock dividends Preferred Stock Dividends, Income Statement Impact Other Effective Income Tax Rate Reconciliation, Other Adjustments, Amount Deferred tax liabilities: Deferred Tax Liabilities, Gross [Abstract] Unvested as of beginning of the period (in shares) Unvested as of end of period (in shares) Share-Based Compensation 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inventories or facilities. Equity Components [Axis] Equity Components [Axis] Jason P. Hanson [Member] Jason P. 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Entity Central Index Key Entity Central Index Key PEO Name PEO Name Total net revenue (loss) Revenues Gains (losses) recognized in other non-interest income: Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net 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] Credit Quality Indicator Financing Receivable Credit Quality Indicators [Table Text Block] Outstanding Aggregate Erroneous Compensation Amount Outstanding Aggregate Erroneous Compensation Amount Payment for origination, loan, mortgage, held-for-sale Payment for Origination, Loan, Mortgage, Held-for-Sale Carrying Value (in millions) Preferred Stock, Including Additional Paid in Capital, Net of Discount State taxes State and Local Income Tax Expense (Benefit), Continuing Operations Qualified affordable housing investments, commitment Investment Program, Proportional Amortization Method, Elected, Commitment Non-interest-bearing deposits Noninterest-Bearing Deposit Liabilities 2026 Time Deposit Maturities With Contractual Maturity Dates, Next Twelve Months Time Deposit Maturities With Contractual Maturity Dates, Next Twelve Months Schedule of Segment Reporting Information, by Segment [Table] Schedule of Segment Reporting Information, by Segment [Table] Derivative Asset, netting adjustments Derivative Asset, Subject to Master Netting Arrangement, Gross Liability and Collateral, Obligation to Return Cash, Offset Schedule of Derivative Assets and Liabilities at Fair Value Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block] Exercise Price Award Exercise Price Entity Filer Category Entity Filer Category Minimum Capital Adequacy Banking Regulation, Tier 1 Risk-Based Capital Ratio, Capital Adequacy, Minimum Class of Stock [Domain] Class of Stock [Domain] Notification of Death Notification of Death [Member] Notification of Death [Member] Valuation Allowance by Deferred Tax Asset [Axis] Valuation Allowance by Deferred Tax Asset [Axis] Unrecognized compensation expense related to unvested awards, awards other than options Share-Based Payment Arrangement, Nonvested Award, Excluding Option, Cost Not yet Recognized, Amount Income tax at U.S. federal statutory tax rate Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent Subsequent Event Type [Axis] Subsequent Event Type [Axis] Goodwill and intangibles Deferred Tax Liabilities Derivative Instruments Deferred Tax Liabilities Derivative Instruments Total Assets Hedged Asset, Fair Value Hedge, Cumulative Increase (Decrease) International taxes Foreign Income Tax Expense (Benefit), Continuing Operations Balance Sheet Location [Axis] Statement of Financial Position Location, Balance [Axis] 2028 Finite-Lived Intangible Asset, Expected Amortization, Year Three Loans held for investment Financing Receivable, before Allowance for Credit Loss Entities that provide capital to low-income and rural communities Investment Companies Providing Capital to Low-Income and Rural Communities [Member] Investment Companies Providing Capital to Low-Income and Rural Communities Customer net revenue range Customer Net Revenue Range Customer Net Revenue Range Other intangible assets (definite lived): Finite-Lived Intangible Assets, Gross Deposits and Borrowings Debt and Deposit Liabilities Disclosures [Text Block] Information about short-term and long-term debt arrangements, including amounts of borrowings, repayment terms, interest rates, collateral provided, restrictions on use of assets and activities, whether or not in compliance with debt covenants, and other matters important to users of the financial statements. Also includes the entire disclosure for deposit liabilities including data and tables. 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] Savings Account and Related Attorney General Litigation Savings Account and Related Attorney General Litigation [Member] Savings Account and Related Attorney General Litigation Threshold period past due for delinquency status of financing receivables Threshold Period Past Due for Delinquency Status of Financing Receivables Threshold Period Past Due for Delinquency Status of Financing Receivables Other debt: Other Debt [Abstract] Other debt. Entity Address, Address Line One Entity Address, Address Line One Accumulated Other Comprehensive Income (Loss) Total AOCI Attributable to Parent [Member] Investments [Domain] Investments [Domain] Swap rates Measurement Input, Swap Rates [Member] Measurement input using swap rates Nondeductible FDIC Premiums Effective Income Tax Rate Reconciliation, Nondeductible Expense, FDIC, Percent Effective Income Tax Rate Reconciliation, Nondeductible Expense, FDIC, Percent Revolving Loans Converted to Term Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan, Writeoff Internal Credit Assessment [Axis] Internal Credit Assessment [Axis] Reissuance of treasury stock, issuance of preferred stock and stock-based compensation awards related to the Transaction Stock Issued Defined Benefit Plan, Funding Status [Axis] Defined Benefit Plan, Funding Status [Axis] Business Combination, Asset Acquisition, Transaction between Entities under Common Control, and Joint Venture 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Position, Less than 12 Months Capital Ratio Banking Regulation, Tier 1 Risk-Based Capital Ratio, Actual Schedule of Assets and Liabilities Measured at Fair Value on Recurring Basis Quantitative Information Fair Value Measurement Inputs and Valuation Techniques [Table Text Block] Changed Peer Group, Footnote Changed Peer Group, Footnote [Text Block] Financial Instrument Performance Status [Axis] Financial Instrument Performance Status [Axis] Counterparty Name [Domain] Counterparty Name [Domain] 90 Plus Day Delinquent Loans Accruing Interest and Nonperforming Loans Financing Receivable, Nonaccrual [Table Text Block] Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type [Table] Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type [Table] 2027 Lessee, Operating Lease, Liability, to be Paid, Year Two Loans held for investment: Loans and Leases Receivable, Net Amount [Abstract] Condensed Financial Information Disclosure [Abstract] Condensed Financial Information Disclosure [Abstract] Adjustment To PEO Compensation, Footnote Adjustment To PEO Compensation, Footnote [Text Block] Net unrealized gains (losses) on securities available for sale Other Comprehensive Income (Loss), Available-for-Sale Securities Adjustment, before Tax, Portion Attributable to Parent Net unrealized gains (losses) on securities available for sale Other Comprehensive Income (Loss), Available-for-Sale Securities, Tax, Portion Attributable to Parent Investment Type [Axis] Investment Type [Axis] Finance Lease, Liability, Statement of Financial Position [Extensible Enumeration] Finance Lease, Liability, Statement of Financial Position [Extensible Enumeration] Title Trading Arrangement, Individual Title Peer Group Total Shareholder Return Amount Peer Group Total Shareholder Return Amount Preferred stock: Preferred Stock, Financing Activities [Abstract] Preferred Stock, Financing Activities [Abstract] Investment Program, Proportional Amortization Method, Applied, Amortization Expense, Statement of Income or Comprehensive Income [Extensible Enumeration] Investment Program, Proportional Amortization Method, Applied, Amortization Expense, Statement of Income or Comprehensive Income [Extensible Enumeration] Series O Series O Preferred Stock [Member] Series O Preferred Stock Securities Collateral Held Under Master Netting Agreements Derivative Asset, Fair Value of Collateral Total cash consideration for acquisition Payments to Acquire Businesses, Gross Non-PEO NEO Non-PEO NEO [Member] Per annum dividend rate Per Annum Dividend Rate Preferred Stock, Dividend Rate, Percentage Accumulated Other Comprehensive Income (Loss) [Line Items] Accumulated Other Comprehensive Income (Loss) [Line Items] Other Consumer Loans Other Consumer Loans [Member] Other Consumer Loans [Member] Other Other Other Intangible Assets [Member] Land Land [Member] Gross Unrealized Gains Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax 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Amount Outstanding Recovery Compensation Amount Deferred income tax provision (benefit): Deferred Income Tax Expense (Benefit), Continuing Operations [Abstract] Litigation cof_LossContingencyRelatedtoLitigationMattersPolicyTextBlock [Policy Text Block] cof_LossContingencyRelatedtoLitigationMattersPolicyTextBlock All other Effective Income Tax Rate Reconciliation, Other Reconciling Items, Percent Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Foreign exchange and other contracts Foreign Exchange Contract [Member] Recovery of Erroneously Awarded Compensation Disclosure [Line Items] Estimated Fair Value Estimate of Fair Value Measurement [Member] Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract] Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract] Retirement Plan Type [Domain] Retirement Plan Type [Domain] Criticized performing Performing Financial Instruments [Member] MNPI Disclosure Timed for Compensation Value MNPI Disclosure Timed for Compensation Value [Flag] Foreign tax effects Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Percent Components of Other Comprehensive Income (Loss) and Related Tax Impact Schedule of Amounts Recognized in Other Comprehensive Income (Loss) [Table Text Block] Documents Incorporated by Reference Documents Incorporated by Reference [Text Block] Restricted Equity Investments cof_ Restricted Equity Investments Policy Text Block [Policy Text Block] cof_ Restricted Equity Investments Policy Text Block Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] Financing Receivable, Past Due [Line Items] Financing Receivable, Past Due [Line Items] Total long-term debt Long-Term Debt and Lease Obligation Amortization method qualified affordable housing investments Investment, Proportional Amortization Method, Elected, Amount Accumulated other comprehensive loss Accumulated Other Comprehensive Income (Loss), Net of Tax Equity in undistributed earnings of subsidiaries Equity In Undistributed Net Income (Loss) Equity in undistributed Net Income (loss) of subsidiaries and Net income (loss) from Discontinued Ops Attributable to Parent Hedged Items In Fair Value Hedging Relationship [Table] Hedged Items In Fair Value Hedging Relationship [Table] Table shows the carrying amount and associated cumulative basis adjustment related to the application of hedge accounting that is included in the carrying amount of hedged assets and liabilities in fair value hedging relationships. Carrying Amount of Assets Goodwill, Gross 2026 Long-Term Debt, Maturity, Year One Financial Instruments [Domain] Financial Instruments [Domain] Total deferred tax liabilities Deferred Tax Liabilities, Gross Purchases Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases Finance lease liabilities Financial Lease Liabilities [Member] Financial Lease Liabilities 2030 Long-Term Debt, Maturity, Year Five Aggregate Pension Adjustments Service Cost Aggregate Pension Adjustments Service Cost [Member] Carrying Amount of Assets Intangible Assets Gross Including Goodwill Intangible Assets Gross Including Goodwill International card businesses International Card Business [Member] International Card Business Other Effective Income Tax Rate Reconciliation, Nondeductible Expense, Other, Amount Realized gains (losses) reclassified from AOCI into net income Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, after Tax Time Deposits, Fiscal Year Maturity: Time Deposits With Contractual Maturity Dates, Fiscal Year Maturity [Abstract] Time Deposits With Contractual Maturity Dates, Fiscal Year Maturity [Abstract] Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets by Major Class [Axis] Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations [Table] Banking Regulation, Regulatory Capital Requirement, Compliance [Table] Minimum Minimum Minimum [Member] Net interest income after provision for credit losses Interest Income (Expense), after Provision for Loan Loss Potential annual reduction in vesting based on performance (percent) Share-based Compensation Arrangement by Share-based Payment Award, Potential Annual Reduction in Vesting Based on Performance, Percentage Share-based Compensation Arrangement by Share-based Payment Award, Potential Annual Reduction in Vesting Based on Performance, Percentage Accrued interest receivable Financing Receivable, Accrued Interest, before Allowance for Credit Loss Goodwill, measurement period adjustment Goodwill, Measurement Period Adjustment Revaluation Of State Attributes Revaluation Of State Attributes [Member] Revaluation Of State Attributes Company Selected Measure Name Company Selected Measure Name Total other VIEs Nonsecuritization-Related Variable Interest Entities [Member] Nonsecuritization-Related Variable Interest Entities Fair Value Measurement [Domain] Fair Value Measurement [Domain] Loans held for investment Gain (Loss) On Fair Value Loans Held For Investment Recognized In Earnings Gain (Loss) On Fair Value Loans Held For Investment measured on nonrecurring basis Aggregate Available Trading Arrangement, Securities Aggregate Available Amount Cash paid for amounts included in the measurement of lease liabilities Operating Lease, Payments Stock Appreciation Rights (SARs) Stock Appreciation Rights (SARs) [Member] Depositary Shares, Each Representing a 1/40th Interest in a Share of Fixed Rate Non-Cumulative Perpetual Preferred Stock, Series K Series K Series K Preferred Stock [Member] Outstanding nonredeemable series K preferred stock or outstanding series K preferred stock. Classified within stockholders' equity if nonredeemable or redeemable solely at the option of the issuer. Classified within temporary equity if redemption is outside the control of the issuer. Carrying Amount of Assets Mortgage Servicing Asset at Amortized Cost, Gross Mortgage Servicing Asset at Amortized Cost, Gross Affordable housing entities Affordable Housing Entities [Member] The Company invests in affordable housing properties. Affordable housing VIEs can be corporations, partnerships, trusts, or any other legal structure used for investing in affordable housing properties. The Company consolidates those VIEs in which it has a variable interest, power to direct significant activities of the VIE, and obligation to absorb losses or right to receive benefits that could be significant to the VIE. The Company's exposure to losses is limited to its variable interests. International taxes Current Foreign Tax Expense (Benefit) Goodwill [Roll Forward] Goodwill [Roll Forward] > 90 Days and Accruing Financing Receivable, 90 Days or More Past Due, Still Accruing Loans, Including Loans Held for Sale Interest income - Loans [Member] Interest income - Loans [Member] Total weighted-average diluted common shares outstanding (in shares) Weighted Average Number of Shares Outstanding, Diluted Business Segment Reporting Methodology Segment Reporting, Policy [Policy Text Block] Non-GAAP Measure Description Non-GAAP Measure Description [Text Block] 2029 Time Deposits Maturities With Contractual Maturity Dates and Long-Term Debt Maturities, Year Four Time Deposits Maturities With Contractual Maturity Dates and Long-Term Debt Maturities, Year Four Current Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Current Entity Small Business Entity Small Business Income Tax Disclosure [Abstract] Income Tax Disclosure [Abstract] Equity securities Equity Securities, Fair Value Disclosure Equity Securities Classified as Other Assets, Fair Value Disclosure Domestic Credit Card and Commercial Banking Portfolios Domestic Credit Card and Commercial Banking Portfolios [Member] Domestic Credit Card and Commercial Banking Portfolios Preferred stock, shares outstanding (in shares) Preferred Stock, Shares Outstanding State taxes Current State and Local Tax Expense (Benefit) Document Transition Report Document Transition Report Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] Other assets Business Combination, Recognized Asset Acquired, Other Asset, Noncurrent Loan Restructuring Modification Name [Axis] Loan Restructuring Modification Name [Axis] Underlying Securities Award Underlying Securities Amount Gross realized gains Debt Securities, Available-for-Sale, Realized Gain Equity Component [Domain] Equity Component [Domain] Document Period End Date Document Period End Date Cash and Cash Equivalents [Domain] Cash and Cash Equivalents [Domain] Amortization expense (benefit) Amortization of Basis Adjustment on Discontinued Hedges Amortization of Basis Adjustment on Discontinued Hedges Income Taxes Income Tax Disclosure [Text Block] Total cash and cash equivalents Cash and cash equivalents Cash, Cash Equivalents, and Federal Funds Sold Loan Fees & Expenses Deferred Tax Liabilities, Security and Loan Valuations Deferred Tax Liabilities, Security and Loan Valuations Equity investments accounted for under measurement alternative Investments in Affiliates, Subsidiaries, Associates, and Joint Ventures, Fair Value Disclosure Geographic Distribution [Domain] Geographic Distribution [Domain] Awards Close in Time to MNPI Disclosures, Table Awards Close in Time to MNPI Disclosures [Table Text Block] Net Exposure Derivative Asset, Including Not Subject to Master Netting Arrangement, after Offset and Deduction Capital One Bank (USA), N.A. Capital One Bank (USA) N.A. [Member] Capital One Bank (USA) N.A. [Member] Variable interest entity, nonconsolidated Variable Interest Entity, Nonconsolidated, Total Assets Variable Interest Entity, Nonconsolidated, Total Assets Weighted-average expected life Debt Maturities, Available-for-Sale, Weighted Average Expected Life Debt Maturities, Available-for-Sale, Weighted Average Expected Life Document Type Document Type Level 3 Fair Value, Inputs, Level 3 [Member] Earnings Per Common Share Earnings Per Share [Text Block] 1.650% Senior Notes Due 2029 Senior Notes Due 2029 [Member] 1.650% Senior Notes Due 2029 Name Outstanding Recovery, Individual Name Loss Contingencies [Table] Loss Contingencies [Table] Additional paid-in capital, net Additional Paid in Capital Product and Service [Axis] Product and Service [Axis] Revolving Loans Financing Receivable, Excluding Accrued Interest, Revolving, Writeoff Litigation settlement, loss Litigation Settlement, Loss Total contract revenue Revenue from Contract with Customer, Excluding Assessed Tax Variable lease cost Variable Lease, Cost Loans to subsidiaries Receivables From Subsidiaries Receivables From Subsidiaries Small Business Banking Loans Small Business Banking Loans [Member] Small Business Banking Loans [Member] Treasury stock, par value (in dollars per share) Treasury Stock, Par Value Treasury Stock, Par Value Credit Card Credit Card Segment [Member] Credit Card Segment Neal Blinde [Member] Neal Blinde Statistical Measurement [Axis] Statistical Measurement [Axis] Loss contingency accrual Loss Contingency Accrual Credit Score, FICO [Domain] Credit Score, FICO [Domain] Term loan by year, year 2 Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year, Writeoff Class of Securities [Axis] Class of Securities [Axis] Class of Securities Robert M. Alexander [Member] Robert M. Alexander Fair Value Measurement Inputs and Valuation Techniques [Line Items] Fair Value Measurement Inputs and Valuation Techniques [Line Items] Compensation and employee benefits Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Employee Compensation Cumulative Effect, Period of Adoption, Adjusted Balance Cumulative Effect, Period of Adoption, Adjusted Balance [Member] Aggregate Erroneous Compensation Amount Aggregate Erroneous Compensation Amount Disposal Group Name [Axis] Disposal Group Name [Axis] Percentage, 90 Days Past Due and Accruing Financing Receivable, Percent 90 Days Past Due and Still Accruing Financing Receivable, Percent 90 Days Past Due and Still Accruing Peer Group Issuers, Footnote Peer Group Issuers, Footnote [Text Block] Due > 1 Year through 5 Years Debt Securities, Available-for-Sale, Maturity, Allocated and Single Maturity Date, Rolling after One Through Five Years, Fair Value Net income available to common stockholders Net Income (Loss) Available to Common Stockholders, Basic Service charges and other customer-related fees Service Charges And Other Customer Fees, Contracts [Member] Service Charges And Other Customer Fees, Contracts [Member] Entity Information [Line Items] Entity Information [Line Items] Principal balance reduction and term extension Extended Maturity and Principal Forgiveness [Member] Other comprehensive income (loss), net of tax Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent Interest rate reduction and term extension Extended Maturity and Interest Rate Reduction [Member] Guarantor Obligations, Nature [Domain] Guarantor Obligations, Nature [Domain] Gains (Losses) on Free-Standing Derivatives Derivative Instruments, Gain (Loss) [Table Text Block] Operating expenses Operating Expenses Price per share of Capital One common stock (in usd per share) Business Combination, Price Per Share Level 1 Fair Value, Inputs, Level 1 [Member] Interest payable Business Combination, Recognized Liability Assumed, Accounts Payable, Current Liquidation Preference per Share (in dollars per share) Preferred Stock, Redemption Price Per Share 2026 Time Deposits Maturities With Contractual Maturity Dates, Debt, Long-term and Short-term, Combined Amount, Maturities, Next Twelve Months Time Deposits Maturities With Contractual Maturity Dates, Debt, Long-term and Short-term, Combined Amount, Maturities, Next Twelve Months Net income (loss) per diluted common share (in dollars per share) Earnings Per Share, Diluted Other Effective Income Tax Rate Reconciliation, Tax Credit, Other, Amount Capital Ratio Banking Regulation, Supplementary Leverage Ratio, Actual Reclassification out of Accumulated Other Comprehensive Income [Axis] Reclassification out of Accumulated Other Comprehensive Income [Axis] Long lived assets held for sale Long-Lived Asset, Held-for-Sale, Fair Value Disclosure Schedule of Realized Gain (Loss) Schedule of Realized Gain (Loss) [Table Text Block] Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] AOCI Attributable to Parent, Net of Tax [Roll Forward] Total loans modified Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount Dividends—preferred stock Dividends, Preferred Stock, Cash VIE, nonconsolidated, carrying amount of liabilities included in certain investment structures Variable Interest Entities, nonconsolidated, Carrying amount of liabilities included in certain investment structures In certain investment structures, we consolidate a VIE which in turn holds as its primary asset an investment in an unconsolidated VIE. This concept represents the carrying amount of liabilities related to these investment structures. Hedged Item in Fair Value Hedging Relationship Hedged Item in Fair Value Hedging Relationship [Table Text Block] Table shows the carrying amount and associated cumulative basis adjustment related to the application of hedge accounting that is included in the carrying amount of hedged assets and liabilities in fair value hedging relationships. Treasury stock, shares (in shares) Treasury Stock, Common, Shares Net income (expense) recognized on cash flow hedges Gain (Loss) On Cash Flow Hedges Recognized In Earnings Total amount of gain (loss) derived from cash flow hedges recognized in earnings in the period Domestic state and local: Income Tax Paid, State and Local, after Refund Received Consolidation Items [Domain] Consolidation Items [Domain] Derivative Liability, Statement of Financial Position [Extensible Enumeration] Derivative Liability, Statement of Financial Position [Extensible Enumeration] Investments, Debt and Equity Securities [Abstract] Investments, Debt and Equity Securities [Abstract] Auditor Location Auditor Location Core deposit Core Deposits [Member] Unconsolidated Variable Interest Entity, Not Primary Beneficiary [Member] Depositary Shares, Each Representing a 1/40th Interest in a Share of Fixed Rate Non-Cumulative Perpetual Preferred Stock, Series N Series N Series N Preferred Stock [Member] Series N Preferred Stock Customer reward expenses Customer Reward Expenses Customer Reward Expenses Term extension Extended Maturity [Member] Condensed Balance Sheet Statement [Table] Condensed Balance Sheet Statement [Table] Financing Receivable Portfolio Segment [Axis] Financing Receivable Portfolio Segment [Axis] Domestic Tax Jurisdiction Domestic Tax Jurisdiction [Member] Total Gains or (Losses) (Realized/Unrealized), Included in Net Income Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Gain (Loss) Included in Earnings Less: Imputed interest Lessee, Operating Lease, Liability, Undiscounted Excess Amount Other Modifications Other Modifications [Member] Other Modifications Other Effective Income Tax Rate Reconciliation, Nondeductible Expense, Other, Percent Income taxes paid Income Taxes Paid, Net Restricted Cash and Cash Equivalents [Axis] Restricted Cash and Cash Equivalents [Axis] 2027 Finite-Lived Intangible Asset, Expected Amortization, Year Two Collaborative Arrangement and Arrangement Other than Collaborative [Table] Collaborative Arrangement and Arrangement Other than Collaborative [Table] Total unfunded lending commitments, contractual amount Letter of Credit Issued Contractual Amount and Unused Commitment to Extend Credit Letter of credit issued contractual amount and unused commitment to extend credit Entity Well-known Seasoned Issuer Entity Well-known Seasoned Issuer Total undiscounted lease payments Lessee, Operating Lease, Liability, to be Paid Schedule of Comparison of Capital Ratios Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations [Table Text Block] Due > 5 Years through 10 Years Debt Securities, Available-for-Sale, Maturity, Allocated and Single Maturity Date, Rolling after 5 through 10 Years, Fair Value Total loans held for investment Total Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss Other: Accumulated Other Comprehensive Income (Loss), Other Component [Member] Accumulated other comprehensive income or loss from pension, other postretirement benefit plans, and others. Net Amounts as Recognized Securities Sold under Agreements to Repurchase Brand/Trade names Trade Names [Member] 2028 Time Deposits Maturities With Contractual Maturity Dates and Long-Term Debt Maturities, Year Three Time Deposits Maturities With Contractual Maturity Dates and Long-Term Debt Maturities, Year Three Schedule of Available-for-Sale Securities in Gross Unrealized Loss Position Debt Securities, Available-for-Sale, Unrealized Loss Position, Fair Value [Table Text Block] Expiration Date Trading Arrangement Expiration Date Finance lease expense Finance Lease, Cost Finance Lease, Cost Total Loans Financing Receivable, Excluding Accrued Interest, Modified, after 12 Months Financing Receivable, Excluding Accrued Interest, Modified, after 12 Months Changes in other liabilities Increase (Decrease) in Other Operating Liabilities 2030 Finite-Lived Intangible Asset, Expected Amortization, Year Five Changes in other borrowings Proceeds from (Repayments of) Other Debt Other Other Investments [Member] Premises and equipment, net Total premises and equipment, net Property, Plant and Equipment, Net Net unrealized gains (losses) on securities available for sale Net unrealized gains (losses) on securities available for sale Other Comprehensive Income (Loss), Available-for-Sale Securities Adjustment, Net of Tax, Portion Attributable to Parent Compensation Actually Paid vs. Net Income Compensation Actually Paid vs. Net Income [Text Block] Amended and Restated 2004 Stock Incentive Plan Stock Incentive Plan 2004 [Member] The active stock-based employee compensation plan. Under the plan, we reserve common shares for issuance in various forms including incentive stock options, nonstatutory stock options, stock appreciation rights, restricted stock awards, restricted stock units, and performance share units. Recoveries on acquired Discover loans that are fully charged off Financial Asset Acquired and Recovered [Member] Financial Asset Acquired and Recovered Common stock: Payments of Ordinary Dividends [Abstract] Entity Current Reporting Status Entity Current Reporting Status Due in 1 Year or Less Debt Securities, Available-for-Sale, Maturity, Rolling within One Year, Weighted Average Yield Receivables [Abstract] Receivables [Abstract] Business combination, expected recovery in allowance for credit losses Business Combination, Expected Recovery in Allowance for Credit Losses Business Combination, Expected Recovery in Allowance for Credit Losses Life of receivables (months) Measurement Input, Life of Receivables [Member] Measurement input using life of receivables Awards Close in Time to MNPI Disclosures Awards Close in Time to MNPI Disclosures [Table] Consolidated Entities [Domain] Consolidated Entities [Domain] Credit card marketing expense Credit Card Marketing Expense Credit Card Marketing Expense Income tax at U.S. federal statutory tax rate Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount Derivative liabilities, gross amount Gross Amounts Derivative Liability, Gross Liability Including Not Subject to Master Netting Arrangement Issuance of senior and subordinated notes and long-term FHLB advances Proceeds from Issuance of Unsecured Debt and Long Term FHLB Advances, Net of Issuance Cost Proceeds from issuance of senior and sub notes and long term FHLB advances, Net of Issuance Cost Other interest-bearing deposits Deposits, Others Deposits, Others Financial Instrument [Axis] Financial Instrument Financial Instrument [Axis] Adjustments to reconcile net income to net cash from operating activities: Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity, Noncash Item [Abstract] Statement of Financial Position [Abstract] Statement of Financial Position [Abstract] Executive Category: Executive Category [Axis] Gross Unrealized Loss - 12 Months or Longer Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss Loans Financing Receivable [Policy Text Block] Depositary Shares, Each Representing a 1/40th Interest in a Share of Fixed Rate Non-Cumulative Perpetual Preferred Stock, Series J Series J Series J Preferred Stock [Member] Outstanding nonredeemable series J preferred stock or outstanding series J preferred stock. Classified within stockholders' equity if nonredeemable or redeemable solely at the option of the issuer. Classified within temporary equity if redemption is outside the control of the issuer. 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Weighted-Average Grant Date Fair Value per Unit Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract] Shares remaining available (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant Net Amounts as Recognized Derivative liability Derivative Liability Other Other Noninterest Expense Reclassification out of Accumulated Other Comprehensive Income [Domain] Reclassification out of Accumulated Other Comprehensive Income [Domain] Equity Awards Adjustments, Excluding Value Reported in Compensation Table Equity Awards Adjustments, Excluding Value Reported in the Compensation Table [Member] Noncriticized Pass [Member] Loan Restructuring Modification [Axis] Loan Restructuring Modification [Axis] Interest rate contracts: Interest Rate Contract [Member] Securitized debt obligations Securitized Debt Obligations Interest Expense, Secured Debt Interest Expense, Secured Debt Delinquent Loans Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent Gross Unrealized Loss - 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Goodwill by Business Segments Schedule of Goodwill [Table Text Block] Trading Arrangement: Trading Arrangement [Axis] Total Shareholder Return Amount Total Shareholder Return Amount Repurchase agreements Offsetting Securities Sold under Agreements to Repurchase [Abstract] Loss Contingencies [Line Items] Loss Contingencies [Line Items] Retained interests in securitizations Retained Interest [Member] Securities Resale and Repurchase Agreements Repurchase and Resale Agreements Policy [Policy Text Block] Current Financial Asset, Current And Less Than 30 Days Past Due [Member] Financial Asset, Current And Less Than 30 Days Past Due [Member] Other Segment Reporting, Reconciling Item, Corporate Nonsegment [Member] Security Exchange Name Security Exchange Name Common equity Tier 1 capital: Tier One Common Equity [Abstract] Tier One Common Equity [Abstract] Securities available for sale Business Combination, Recognized Asset Acquired, Securities Available for Sale Business Combination, Recognized Asset Acquired, Securities Available for Sale Senior and Subordinated Notes Interest expense - Senior and Subordinated Debt [Member] Interest expense - Senior and Subordinated Debt [Member] Foreign Income Tax Paid, Foreign, after Refund Received Goodwill Goodwill, Impaired, Accumulated Impairment Loss [Abstract] Mark Daniel Mouadeb [Member] Mark Daniel Mouadeb Standby letters of credit and commercial letters of credit, contractual amount Line of Credit Facility, Maximum Borrowing Capacity Business Combination, Consideration Transferred, Equity Interest, Type [Domain] Business Combination, Consideration Transferred, Equity Interest, Type [Domain] Indefinite-Lived Intangible Assets, Major Class Name [Domain] Indefinite-Lived Intangible Assets, Major Class Name [Domain] Common stock: Common Stock, Financing Activities [Abstract] Common Stock, Financing Activities [Abstract] Foreclosed property and repossessed assets, fair value disclosure Foreclosed Property and Repossessed Assets, Fair Value Disclosure Foreclosed property and repossessed assets, fair value disclosure Total Gains or (Losses) (Realized/Unrealized), Included in Net Income Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings Financing Receivable, Modified, Subsequent Default [Table] Financing Receivable, Modified, Subsequent Default [Table] Schedule of Intangible Assets by Major Class [Line Items] Schedule of Intangible Assets by Major Class [Line Items] [Line Items] for Schedule of Intangible Assets by Major Class [Table] Net loans held for investment (see Table 2.3) Business Combination, Recognized Asset Acquired, Loans Held for Investment Business Combination, Recognized Asset Acquired, Loans Held for Investment Statement [Line Items] Statement [Line Items] Entity Loan Modification Program Entity Loan Modification Program [Member] Securities Collateral Pledged Under Master Netting Agreements Security Sold under Agreement to Repurchase, Subject to Master Netting Arrangement, Collateral, Right to Reclaim Security Not Offset 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] Retained interests in securitizations Retained Interest, Fair Value Disclosure Other borrowings Business Combination, Recognized Liability Assumed, Other Borrowings Business Combination, Recognized Liability Assumed, Other Borrowings Credit car lines, contractual amount Unused Commitments to Extend Credit Subsequent Event [Line Items] Subsequent Event [Line Items] Common Stock (par value $.01 per share) Common Stock Common Stock [Member] Vested (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period Goodwill and Other Intangible Assets Goodwill and Intangible Assets, Intangible Assets, Policy [Policy Text Block] CONA: Capital One, N.A. [Member] Capital One, N.A. [Member] Changes in cash, cash equivalents and restricted cash for securitization investors Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Period Increase (Decrease), Including Exchange Rate Effect and Discontinued Operation Total effect of dilutive securities (in shares) Weighted Average Number of Shares Outstanding, Diluted, Adjustment Cybersecurity Incident Cybersecurity Incident [Member] Cybersecurity Incident [Member] Statistical Measurement [Domain] Statistical Measurement [Domain] Premises and equipment Business Combination, Recognized Asset Acquired, Property, Plant, and Equipment Thereafter Lessee, Operating Lease, Liability, to be Paid, after Year Five Condensed Balance Sheet Condensed Balance Sheet [Table Text Block] Underlying Asset Class [Axis] Underlying Asset Class [Axis] Securities available for sale, amortized cost Amortized Cost Basis Total Debt Securities, Available-for-Sale, Amortized Cost, Excluding Accrued Interest, before Allowance for Credit Loss RMBS, Non-agency Residential Mortgage Backed Securities, Non-agency [Member] Securities collateralized by non-agency residential real estate mortgage loans. Financing receivable, nonaccrual, interest income Interest income for loans classified as nonperforming Financing Receivable, Nonaccrual, Interest Income Weighted-Average Interest Rate Long-Term Debt, Weighted Average Interest Rate, at Point in Time Carrying Amount of Assets Intangible Assets, Gross (Excluding Goodwill) Valuation Approach and Technique [Domain] Valuation Approach and Technique [Domain] Customer Rewards Reserve cof_Customer Rewards Reserve Policy Text Block [Policy Text Block] cof_Customer Rewards Reserve Policy Text Block Total Gains or (Losses) (Realized/Unrealized), Included in OCI Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) 621-660 FICO Score 621 To 660 [Member] FICO Score 621 To 660 [Member] Additions for tax positions related to prior years Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions Basic earnings per common share: Earnings Per Share, Basic [Abstract] Number of shares of Capital One treasury stock issued in the acquisition (in shares) Business Combination, Consideration Transferred, Equity Interest, Share Issued, Number of Shares Restricted cash for securitization investors Restricted Cash and Cash Equivalents, Fair value Disclosure Restricted Cash and Cash Equivalents, Fair value Disclosure Total Loan Held For Investment [Member] Loan Held For Investment Retirement Plan Name [Axis] Retirement Plan Name [Axis] Transfers Into Level 3 Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Transfers into Level 3 Domestic credit card Domestic Card [Member] Domestic Card Gross Unrealized Losses Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax Trading Arrangements, by Individual Trading Arrangements, by Individual [Table] Net income (loss) per basic common share (in dollars per share) Net income per basic common share (in dollars per share) Earnings Per Share, Basic Series M Series M Preferred Stock [Member] Outstanding nonredeemable series M preferred stock or outstanding series M preferred stock. Classified within stockholders' equity if nonredeemable or redeemable solely at the option of the issuer. Classified within temporary equity if redemption is outside the control of the issuer. Capital shares reserved for future issuance (in shares) Common Stock, Capital Shares Reserved for Future Issuance Worldwide changes in prior year unrecognized tax benefits Effective Income Tax Rate Reconciliation, Tax Contingency, Percent Subtotal Deferred Tax Assets, Gross Other comprehensive income (loss), net of tax Other Comprehensive Income (Loss), Net of Tax Discount rate Measurement Input, Discount Rate [Member] Schedule of Segment Results and Reconciliation Schedule of Segment Reporting Information, by Segment [Table Text Block] Net loss from discontinued operations (in dollars per share) Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Diluted Share Total short-term borrowings Short-term borrowings Short-Term Debt Changes in interest receivable Increase (Decrease) in Accrued Interest Receivable, Net Measurement Input Type [Domain] Measurement Input Type [Domain] Schedule of Available-for-Sale Securities Schedule of Available-for-Sale Securities Reconciliation [Table Text Block] Brex Inc. Brex Inc. [Member] Brex Inc. Net Unrealized Gains (Losses) Included in Net Income Related to Assets and Liabilities Still Held Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Nature of Uncertainty [Domain] Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Nature of Uncertainty [Domain] Schedule of Assets Measured at Fair Value on Nonrecurring Basis Fair Value Measurements, Nonrecurring [Table Text Block] Cumulative Effect, Period of Adoption [Domain] Cumulative Effect, Period of Adoption [Domain] Total Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff Communications and data processing Communications and Information Technology Award Timing MNPI Disclosure Award Timing MNPI Disclosure [Text Block] Business combination, allowance for credit losses PCD loan Business Combination, Allowance for Credit Losses PCD Loan Business Combination, Allowance for Credit Losses PCD Loan Loans held in consolidated trusts Consolidated Variable Interest Entity, Primary Beneficiary [Member] Financial receivable, non-interest expense Third Party Collections Expense Third Party Collections Expense Business combination, pro forma information, pro forma income (loss) from continuing operations, after tax Business Combination, Pro Forma Information, Pro Forma Income (Loss) from Continuing Operations, after Tax Securities sold under repurchase agreements, fair value of collateral Securities Sold under Agreements to Repurchase, Fair Value of Collateral Other comprehensive income (loss) before reclassifications OCI, before Reclassifications, Net of Tax, Attributable to Parent Derivative Instruments, Gain (Loss) [Line Items] Derivative Instruments, Gain (Loss) [Line Items] Compensation expense from award Share-Based Payment Arrangement, Expense Hedging Designation [Domain] Hedging Designation [Domain] Goodwill and Intangible Assets Disclosure [Abstract] Goodwill and Intangible Assets Disclosure [Abstract] Maturities and paydowns of senior and subordinated notes Repayments of Unsecured Debt and Long Term FHLB Advances The cash outflow to repay senior and subordinated notes and long term FHLB Advances. Securitized debt obligations Secured Debt Loans held for sale ($755 million and $87 million carried at fair value as of December 31, 2025 and 2024, respectively) Loans held for sale Financing Receivable, Held-for-Sale, Not Part of Disposal Group, after Valuation Allowance Audit Information [Abstract] Audit Information Total liabilities and stockholders’ 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] Derivative Instruments, Gain (Loss) [Table] Derivative Instruments, Gain (Loss) [Table] Concentration Risk Benchmark [Axis] Concentration Risk Benchmark [Axis] Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] Amounts reclassified from AOCI into earnings Reclassification from AOCI, Current Period, Net of Tax, Attributable to Parent Other assets Deferred Tax Assets, Other Derivative assets Offsetting Derivative Assets [Abstract] Derivative, collateral, obligation to return securities Derivative Asset, Subject to Master Netting Arrangement, Collateral, Obligation to Return Security Not Offset Federal funds purchased and securities loaned or sold under agreements to repurchase Short-Term Debt, Maturities, Next 12 Months Short-term debt, maturities, next 12 months Accounting Policies [Abstract] Accounting Policies [Abstract] Due > 10 Years Debt Securities, Available-for-Sale, Maturity, Rolling after 10 Years, Weighted Average Yield Financial Instruments Security Sold under Agreement to Repurchase, Subject to Master Netting Arrangement, Asset Offset Schedule of Future Minimum Lease Payments Lessee, Operating Lease, Liability, to be Paid, Maturity [Table Text Block] Concentration Risk Type [Domain] Concentration Risk Type [Domain] Maturities and paydowns of securitized debt obligations Repayments of Secured Debt Other borrowings other borrowings [Member] other borrowings Treasury Stock Treasury Stock, Common [Member] Total fair value of awards vested Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value Term Loans by Vintage Year, Year 1 Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year Pay vs Performance Disclosure [Line Items] Well- Capitalized Banking Regulation, Tier 1 Leverage Capital Ratio, Well Capitalized, Minimum Lease liabilities Total lease liabilities Operating Lease, Liability Loss sharing agreements Loss sharing agreements Loss Sharing Agreement [Member] Loss Sharing Agreement [Member] Foreign currency translation adjustments Foreign currency translation adjustments Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Portion Attributable to Parent Greater than 90 days Financial Asset, Equal to or Greater than 90 Days Past Due [Member] Liabilities: Liabilities [Abstract] Accrued interest receivable Debt Securities, Available-for-Sale, Change in Present Value, Interest Income Depreciation and amortization, net Depreciation, Depletion and Amortization, Nonproduction Redemptions of preferred stock (shares) Stock Redeemed or Called During Period, Shares Auto Auto Automobile Loan [Member] Allowance for credit losses SEC Schedule, 12-09, Allowance, Loan and Lease Loss [Member] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] Gains (losses) recognized on hedged items Change in Unrealized Gain (Loss) on Hedged Item in Fair Value Hedge Unpaid principal balance Business Combination, Unpaid Principal Balance Business Combination, Unpaid Principal Balance Regulatory and Capital Adequacy Regulatory Capital Requirements under Banking Regulations [Text Block] Schedule of Variable Interest Entities [Table] Variable Interest Entity [Table] Interest-bearing Deposits Interest expense - Deposits [Member] Interest expense - Deposits [Member] Term Loans by Vintage Year, Year 3 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 2028 Lessee, Operating Lease, Liability, to be Paid, Year Three Prior Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year, Writeoff Well- Capitalized Banking Regulation, Tier 1 Risk-Based Capital Ratio, Well Capitalized, Minimum Comprehensive income Comprehensive income (loss) Comprehensive income (loss) Comprehensive Income (Loss), Net of Tax, Attributable to Parent Measurement Input Type [Axis] Measurement Input Type [Axis] Amortization term of annual membership fees Amortization Term of Annual Membership Fees Amortization term of credit card annual membership fees Disposal Group Name [Domain] Disposal Group Name [Domain] Name Measure Name Issuances Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Issuances Securitized debt obligations Securitized debt obligations Secured Debt [Member] Other comprehensive income (loss) Other Comprehensive Income (Loss), before Tax, Portion Attributable to Parent Changes in deposits Increase (Decrease) in Deposits Proceeds from paydowns and maturities Proceeds from Maturities, Prepayments and Calls of Debt Securities, Available-for-Sale Sales Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Sales Class of Stock [Line Items] Class of Stock [Line Items] Income from discontinued operations, net of tax Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent Off-balance sheet lending commitment, carrying value Off-Balance Sheet Lending Commitment Carrying Value The carrying value of off-balance sheet lending-related financial instruments (e.g., commitments and guarantees), which represents the allowance for lending-related commitments, deferred revenue and the guarantee liability. Securitized debt obligations Securitized Debt Obligations [Member] securitized debt obligations [Member] Total Gains or (Losses) (Realized/Unrealized), Included in OCI Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Gain (Loss) Included in Other Comprehensive Income (Loss) Derivative Liability, netting adjustments Derivative Liability, Subject to Master Netting Arrangement, Gross Asset and Collateral, Right to Reclaim Cash, Offset Income Tax Contingency [Table] Income Tax Contingency [Table] Carrying value Total Long-Term Debt Legal Entity [Axis] Legal Entity [Axis] Total assets Carrying Amount of Assets Assets Assets Condensed Cash Flow Statement Condensed Cash Flow Statement [Table Text Block] Total Time Deposits With Contractual Maturity Dates Time Deposits With Contractual Maturity Dates Allowance for credit losses Deferred Tax Asset, Tax Deferred Expense, Reserve and Accrual, Financing Receivable, Allowance for Credit Loss 2026 Finite-Lived Intangible Asset, Expected Amortization, Year One Interest receivable Interest Receivable, Fair Value Disclosure This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure and may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. This item represents interest earned but not received as of the balance sheet date. Senior and subordinated notes Senior and Subordinated Notes Interest Expense, Unsecured Debt Interest expense incurred during the reporting period on senior and subordinated notes. Vested (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value Financing Receivable, Credit Quality Indicator [Line Items] Financing Receivable, Credit Quality Indicator [Line Items] Total Shares Outstanding (in shares) Preferred Stock, Depositary Shares Issued Preferred Stock, Depositary Shares Issued Net derivative assets (liabilities) Net Derivative Assets (Liabilities) [Member] Net Derivative Assets (Liabilities) Income Taxes Income Tax, Policy [Policy Text Block] Estimated reimbursements from partners, beginning of period Estimated reimbursements from partners, end of period Loss Sharing Agreements, Financing Receivable, Allowance, Covered, Expected Reimbursement Loss Sharing Agreements, Financing Receivable, Allowance, Covered, Expected Reimbursement Allowance for Credit Losses [Roll Forward] Financing Receivable, Allowance for Credit Loss [Roll Forward] Financing Receivable, Allowance for Credit Loss [Roll Forward] Operating activities: Cash Provided by (Used in) Operating Activity, Including Discontinued Operation [Abstract] Acquired finite-lived intangible assets, weighted average useful life Acquired Finite-Lived Intangible Assets, Weighted Average Useful Life Concentration Risk Type [Axis] Concentration Risk Type [Axis] Proceeds from sales and paydowns Proceeds from Sale and Collection, Loan, Held-for-Sale Dividends from subsidiaries Dividends from Subsidiaries Dividends from Subsidiaries Assets: Assets, Fair Value Disclosure [Abstract] Due > 1 Year through 5 Years Debt Securities, Available-for-Sale, Maturity, Allocated and Single Maturity Date, Rolling after One Through Five Years, Amortized Cost 2029 Finite-Lived Intangible Asset, Expected Amortization, Year Four Variable Interest Entity [Line Items] Variable Interest Entity [Line Items] Performance Share Units Performance Share Units [Member] Performance share units. Minimum Capital Adequacy Banking Regulation, Total Risk-Based Capital Ratio, Capital Adequacy, Minimum Credit Score, FICO [Axis] Credit Score, FICO [Axis] Marketing Marketing Expense Other investments Other Investments Variable Interest Entities Consolidation, Variable Interest Entity, Policy [Policy Text Block] Dividend per share on common stock declared (in dollars per share) Common Stock, Dividends, Per Share, Declared Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Revenue (reduction) from other sources Noninterest Income, Excluding Revenue From Contract With Customer Noninterest Income, Excluding Revenue From Contract With Customer Capital Amount Tier one capital under Basel III standardized approach Tier one capital calculated under Basel III standardized approach Right-of-use assets obtained in exchange for lease liabilities Right-of-Use Asset Obtained in Exchange for Operating Lease Liability Debt Securities, Available-for-sale [Line Items] Debt Securities, Available-for-Sale [Line Items] Changes in loans to subsidiaries Increase (Decrease) in Loans to Subsidiaries Increase (Decrease) in Loans to Subsidiaries Cumulative Effect, Period of Adoption, Adjustment Cumulative Effect, Period of Adoption, Adjustment [Member] Basic earnings per common share: Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Basic Share [Abstract] Level 2 Fair Value, Inputs, Level 2 [Member] Document Financial Statement Error Correction [Flag] Document Financial Statement Error Correction [Flag] Domestic state and local taxes, net of federal effect Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Amount Additional Information [Line Items] Income Tax Examination [Line Items] Loans held for sale: Proceeds from Sale, Loan, Held-for-Sale [Abstract] Securitized debt obligations Secured Debt, Fair Value Disclosure Secured Debt, Fair Value Disclosure Insider Trading Policies and Procedures Not Adopted Insider Trading Policies and Procedures Not Adopted [Text Block] Business Combination [Domain] Business Combination [Domain] Net derivative assets (liabilities), measurement input Derivative Asset (Liability) Net, Measurement Input Schedule of Significant Components of Provision for Income Taxes Attributable to Continuing Operations Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] Plan Name [Axis] Plan Name [Axis] Premises and Equipment Property, Plant and Equipment, Policy [Policy Text Block] PEO PEO [Member] Greater than 660 FICO Score Greater Than 660 [Member] FICO Score Greater Than 660 [Member] Transfers Into Level 3 Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3 Issuance of securitized debt obligations Proceeds from Issuance of Secured Debt Capital Amount Banking Regulation, Tier 1 Leverage Capital, Actual Schedule of Contractual Maturities for Securities Investments Classified by Contractual Maturity Date [Table Text Block] Discontinued Hedging Relationships, Assets Hedged Asset, Discontinued Fair Value Hedge, Cumulative Increase (Decrease) Exercises of stock options (in shares) Stock Issued During Period, Shares, Stock Options and Warrants Exercised and Restricted Stock Vesting Stock Issued During Period, Shares, Stock Options and Warrants Exercised and Restricted Stock Vesting Due in 1 Year or Less Debt Securities, Available-for-Sale, Maturity, Allocated and Single Maturity Date, Rolling within One Year, Fair Value Foreclosed Property and Repossessed Assets Financing Receivable, Held-for-Investment, Foreclosed Asset [Policy Text Block] Changes in operating assets and liabilities: 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] Capital Amount Banking Regulation, Common Equity Tier 1 Risk-Based Capital, Actual Changes in valuation allowance Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount Delinquent Loans, percentage of total loans Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent, Percent Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent, Percent Time deposits Time Deposits Retained Earnings Retained Earnings [Member] Income Tax Authority [Axis] Income Tax Jurisdiction [Axis] Partnership investments Deferred Tax liabilities Partnership Investments Deferred Tax liabilities Partnership Investments Principal recoveries of loans previously charged off Benefit from expected recoveries of charged off loans Proceeds, Financing Receivable, Previously Written off, Recovery Share-based Payment Arrangement [Abstract] Share-Based Payment Arrangement [Abstract] Cash, cash equivalents and restricted cash for securitization investors, beginning of the period Cash, cash equivalents and restricted cash for securitization investors, end of the period Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation Income Statement [Abstract] Income Statement [Abstract] Net Amounts as Recognized Derivative asset Derivative Asset Fair Value - 12 Months or Longer Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer Fixed unsecured senior debt Fixed Unsecured Senior Debt [Member] Fixed unsecured senior debt. Nonrecurring Fair Value, Nonrecurring [Member] Securities available for sale: Proceeds from Sale and Maturity of Debt Securities, Available-for-Sale [Abstract] Other investments Investments, Fair Value Disclosure Changes in interest payable Increase (Decrease) in Interest Payable, Net Other intangible assets Net Carrying Amount Intangible Assets, Net (Excluding Goodwill) Financing Receivable, Troubled Debt Restructuring [Table] Financing Receivable, Modified [Table] Other Non-interest income (expense) Noninterest Income, Other Product and Service [Domain] Product and Service [Domain] Network and financial partner relationships Network and Financial Partner Relationships [Member] Network and Financial Partner Relationships Transfers Out of Level 3 Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Transfers out of Level 3 Net income (loss) from continuing operations (in dollars per share) Income (Loss) from Continuing Operations, Per Diluted Share Restatement does not require Recovery Restatement Does Not Require Recovery [Text Block] Business Combination [Table] Business Combination [Table] Notional or Contractual Amount Derivative, Notional Amount Business Combination, Consideration Transferred, Equity Interest, Type [Axis] Business Combination, Consideration Transferred, Equity Interest, Type [Axis] Securities received as collateral Securities Received as Collateral Net valuation allowance on derivative assets and liabilities for non-performance risk Net valuation allowance Derivative Credit Risk Valuation Adjustment, Derivative Assets (Liabilities) Derivative Credit Risk Valuation Adjustment, Derivative Assets (Liabilities) Revolving Loans Financing Receivable, Excluding Accrued Interest, Revolving Minimum Capital Adequacy Tier One Common Capital Required for Capital Adequacy to Risk Weighted Assets Tier One Common Capital Required for Capital Adequacy to Risk Weighted Assets Realized gain (loss) on foreign exchange contracts reclassified from AOCI Realized Gains (Losses) On Foreign Exchange Contracts Reclassified From AOCI Realized Gains (Losses) On Foreign Exchange Contracts Reclassified From AOCI City Area Code City Area Code Allowance for Credit Losses on Financing Receivables Financing Receivable, Allowance for Credit Loss [Table Text Block] Award Timing, How MNPI Considered Award Timing, How MNPI Considered [Text Block] Gain (loss) from Litigation Settlement Gain (Loss) from Litigation Settlement Net operating loss and tax credit carryforwards Deferred Tax Assets, Operating Loss Carryforwards and Tax Credit Carryforward Amount before allocation of valuation allowances of deferred tax asset attributable to operating loss and tax credit carryforwards. Loan Restructuring Modification Name [Domain] Loan Restructuring Modification Name [Domain] Investing activities: Cash Provided by (Used in) Investing Activity, Including Discontinued Operation [Abstract] Pay vs Performance Disclosure Pay vs Performance Disclosure [Table] Retained interests, measurement input, life of receivables Retained Interest, Measurement Input, Life of Receivables Retained Interest, Measurement Input, life of receivables Operating Lease, Liability, Statement of Financial Position [Extensible List] Operating Lease, Liability, Statement of Financial Position [Extensible Enumeration] Interest receivable Interest Receivable Fair value hedges Fair Value Hedging [Member] Investment securities available for sale Total securities available for sale Debt Securities, Available For Sale [Member] Debt Securities, Available For Sale Related Party Transactions [Abstract] Related Party Transactions [Abstract] Investment Program, Proportional Amortization Method, Elected, Income Tax Credit and Other Income Tax Benefit, before Amortization, Statement of Cash Flows [Extensible Enumeration] Investment Program, Proportional Amortization Method, Elected, Income Tax Credit and Other Income Tax Benefit, before Amortization, Statement of Cash Flows [Extensible Enumeration] Net lease cost Lease, Cost Total securitization-related VIEs Securitization-Related Variable Interest Entities [Member] Securitization-Related Variable Interest Entities Cash flow hedges Cash Flow Hedging [Member] Other liabilities Accrued expenses and other liabilities Other Liabilities Goodwill Net Carrying Amount Goodwill, beginning balance Goodwill, ending balance Goodwill Loss contingency, estimate of possible loss Loss Contingency, Estimate of Possible Loss Schedule of Lease Cost Lease, Cost [Table Text Block] Principal balance reduction Financing Receivable, Modified in Period, Amount Federal taxes Deferred Federal Income Tax Expense (Benefit) Due > 5 Years through 10 Years Debt Securities, Available-for-Sale, Maturity, Rolling after 5 through 10 Years, Weighted Average Yield Transfers Out of Level 3 Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3 Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] Unrecognized Tax Benefits [Roll Forward] Auditor Name Auditor Name Interest recognized on derivatives Gain Or Loss On Fair Value Hedges Recognized In Net Interest Income Gain or loss on fair value hedges recognized in net interest income Supplemental cash flow information: Supplemental Cash Flow Information [Abstract] Beginning balance Ending balance Net derivative assets (liabilities) Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs Preferred Stock Redemption Discount Preferred Stock Redemption Discount Other Performance Measure, Amount Other Performance Measure, Amount US Treasury and Agency securities US Treasury and Government [Member] Low Income Housing Effective Income Tax Rate Reconciliation, Tax Credit, Low Income Housing, Amount Effective Income Tax Rate Reconciliation, Tax Credit, Low Income Housing, Amount Investment Securities Marketable Securities, Policy [Policy Text Block] Business combination, stock-based compensation award Business Combination, Stock-Based Compensation Award Business Combination, Stock-Based Compensation Award Deferred Tax Asset [Domain] Deferred Tax Asset [Domain] Amount Income Tax Expense (Benefit), Effective Income Tax Rate Reconciliation, Amount [Abstract] Voluntary prepayment rate Measurement Input, Constant Prepayment Rate [Member] Derivative Instrument [Axis] Derivative Instrument [Axis] Restricted cash Restricted Cash Fair Value Fair Value of Financial Instruments, Policy [Policy Text Block] Net changes in loans originated as held for investment Payments For (Proceeds From) Sale Of Financing Receivable, Held-For-Investment Payments For (Proceeds From) Sale Of Financing Receivable, Held-For-Investment Financial liabilities: Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract] Debt Fiscal Year Maturity: Debt, Long-term and Short-term, Combined Amount, Fiscal Year Maturity [Abstract] Debt, Long-term and Short-term, Combined Amount, Fiscal Year Maturity [Abstract] Low Income Housing Effective Income Tax Rate Reconciliation, Tax Credit, Low Income Housing, Percent Effective Income Tax Rate Reconciliation, Tax Credit, Low Income Housing, Percent Schedule Of Expected Maturity And Weighted Average Yield Of Securities [Table] Schedule Of Expected Maturity And Weighted Average Yield Of Securities [Table] Schedule of expected maturity and weighted average yield of securities. 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] Interest paid Interest Paid, Excluding Capitalized Interest, Operating Activity Schedule of Debtor Troubled Debt Restructuring, Subsequent Periods Schedule of Debtor Troubled Debt Restructuring, Subsequent Periods [Table Text Block] Document Fiscal Year Focus Document Fiscal Year Focus Basis of Presentation Basis of Accounting, Policy [Policy Text Block] Hedged Items In Fair Value Hedging Relationship [Line Items] Hedged Items In Fair Value Hedging Relationship [Line Items] [Line Items] for Table shows the carrying amount and associated cumulative basis adjustment related to the application of hedge accounting that is included in the carrying amount of hedged assets and liabilities in fair value hedging relationships. Right-of-use assets Operating Lease, Right-of-Use Asset Premium/(Discount) Financing Receivable, Unamortized Purchase Premium (Discount) Issuance of senior and subordinated notes Proceeds from issuance of senior notes and sub notes Proceeds from issuance of senior notes and sub notes FDIC Special Assessment FDIC Special Assessment [Member] FDIC Special Assessment Deferred compensation plan assets Deferred Compensation Plan Assets Effective income tax rate Effective Income Tax Rate Reconciliation, Percent Other reductions for tax positions related to prior years Unrecognized Tax Benefits, Decrease Resulting from Prior Period Tax Positions Operating lease cost Operating Lease, Cost Accounts, Notes, Loans and Financing Receivable, Gross, Allowance, and Net [Abstract] Accounts, Notes, Loans and Financing Receivable, Gross, Allowance, and Net [Abstract] Carrying Value Reported Value Measurement [Member] Plan Name [Domain] Plan Name [Domain] Total goodwill and other intangible assets Intangible Assets, Net (Including Goodwill) [Abstract] Business combination, acquisition related costs Business Combination, Acquisition-Related Cost, Expense Weighted-average period of recognition of unrecognized compensation costs (Years) Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition Loans held for investment, measurement input Loans Held for Investment, Measurement Input Loans held for investment, measurement input Securitized debt obligations Business Combination, Recognized Liability Assumed, Securitized Debt Obligations Business Combination, Recognized Liability Assumed, Securitized Debt Obligations Valuation allowance Valuation allowance Deferred Tax Assets, Valuation Allowance Equity [Abstract] Equity [Abstract] Nonperforming Loans Financing Receivable, Nonaccrual Net securities gains (losses) Net securities losses Debt and Equity Securities, Gain (Loss) Derivatives Instruments and Hedging Activities Derivatives, Policy [Policy Text Block] Business Segments and Revenue from Contracts with Customers Segment Reporting Disclosure [Text Block] Schedule of Goodwill [Table] Goodwill [Table] 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] Derivatives not designated as accounting hedges: Not Designated as Hedging Instrument [Member] U.S. Treasury securities US Treasury Securities [Member] Issuances of common stock and restricted stock, net of forfeitures (in shares) Stock Issued During Period, Shares, New Issues and Restricted Stock, Net of Forfeitures (in shares) Stock Issued During Period, Shares, New Issues and Restricted Stock, Net of Forfeitures Plan assets Defined Benefit Plan, Plan Assets, Amount Federal taxes Current Federal Tax Expense (Benefit) Total short-term borrowings and long-term debt Debt and Lease Obligation Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Assets of discontinued operations Business Combination, Recognized Asset Acquired, Assets of Discontinued Operations Business Combination, Recognized Asset Acquired, Assets of Discontinued Operations Purchases Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Purchases Personal loans Personal Loans [Member] Personal Loans Other securities Other Debt Obligations [Member] Other liabilities Business Combination, Recognized Liability Assumed, Other Liability, Noncurrent Compensation Actually Paid vs. Total Shareholder Return Compensation Actually Paid vs. Total Shareholder Return [Text Block] Advised line of credit Advised Line of Credit The contractual amount of line of credit that drawings are subject to our satisfactory evaluation of the customer and are cancelable upon proper notice. Weighted average Weighted Average [Member] Fair Value, Recurring and Nonrecurring [Table] Fair Value, Recurring and Nonrecurring [Table] Commercial Banking Commercial Banking Segment [Member] Consists of lending, deposit gathering and treasury management services to commercial real estate and middle market customers. Our Commercial Banking business results also include the results of a national portfolio of small ticket commercial real-estate loans that are in run-off mode. Amortization of Intangible Assets Amortization of Intangible Assets Threshold period past due for write-off of trade accounts receivable Threshold Period Past Due, Trade Accounts Receivable, Writeoff Leases Lessee, Leases [Policy Text Block] Redemptions of preferred stock Stock Redeemed or Called During Period, Value Securities available-for-sale, measurement input Debt Securities, Available-for-Sale, Measurement Input Change in AOCI Gain (Loss) by Component (Net of Tax) Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] Criticized nonperforming Nonperforming Financial Instruments [Member] Percentage of total loans Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Percent, Total Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Percent, Total Total RMBS Residential Mortgage-Backed Securities [Member] Foreign tax effects Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Amount Finance lease, liability Finance Lease, Liability Arrangement Duration Trading Arrangement Duration Criticized Criticized [Member] Segments [Axis] Segments [Axis] Tier 1 capital Banking Regulation, Risk-Based Information [Abstract] Schedule of Earnings Related to Assets Measured at Fair Value on Nonrecurring Basis Fair Value Assets Measured On Non Recurring Basis Gain Loss Included In Earnings [Table Text Block] Fair Value Assets Measured On Non Recurring Basis Gain Loss Included In Earnings [Table Text Block] Net unrealized loss on derivatives Deferred Tax Assets, Derivative Instruments Local Phone Number Local Phone Number Additional 402(v) Disclosure Additional 402(v) Disclosure [Text Block] Collaborative Arrangement and Arrangement Other than Collaborative [Domain] Collaborative Arrangement and Arrangement Other than Collaborative [Domain] Other operating activities Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity, Other Item Net cash used in other investing activities Payment for (Proceeds from) Other Investing Activity Thereafter Long-Term Debt, Maturity, after Year Five Stock-Based Compensation Plans Share-Based Payment Arrangement [Text Block] Intangible assets (see Table 2.4) Business Combination, Recognized Asset Acquired, Identifiable Intangible Asset, Excluding Goodwill Cash and cash equivalents and Restricted cash for securitization investors Business Combination, Recognized Asset Acquired, Cash and Cash Equivalent Federal funds purchased and securities loaned or sold under agreements to repurchase Federal Funds Purchased and Securities Sold under Agreements to Repurchase Assets: Assets [Abstract] Chapter Seven Bankruptcy Chapter Seven Bankruptcy [Member] Chapter Seven Bankruptcy [Member] Credit Facility [Axis] Credit Facility [Axis] Other contracts Other Contract [Member] Underlying Security Market Price Change Underlying Security Market Price Change, Percent Debt Instrument [Axis] Debt Instrument [Axis] Forfeited (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value Fair Value Measurement Fair Value Disclosures [Text Block] Employee Benefit Plans Retirement Benefits [Text Block] Business Combination [Line Items] Business Combination [Line Items] Debt and equity securities, unrealized gain (loss) Debt and Equity Securities, Unrealized Gain (Loss) Credit Facility [Domain] Credit Facility [Domain] Stockholders’ equity: Equity, Attributable to Parent [Abstract] Investment Securities Interest income - Investment securities [Member] Interest income - Investment securities [Member] FDM Disclosures Financing Receivable, Modified [Table Text Block] Purchases of treasury stock Treasury Stock, Value, Acquired, Cost Method Stated Interest Rates Debt Instrument, Interest Rate, Stated Percentage 30-59 days Financial Asset, 30 to 59 Days Past Due [Member] Entity Voluntary Filers Entity Voluntary Filers Business combination, pro-forma information, interest income from continuing operations Business Combination, Pro-Forma Information, Interest Income from Continuing Operations Business Combination, Pro-Forma Information, Interest Income from Continuing Operations Other intangible assets (definite lived): Intangible Assets, Net (Excluding Goodwill) [Abstract] Other Other Comprehensive Income (Loss), Other Tax, Attributable To Parent Other Comprehensive Income (Loss), Other Tax, Attributable To Parent Commitments, Contingencies, Guarantees and Others Commitments Contingencies and Guarantees [Text Block] Accrued Interest and Penalties Accrued Interest And Penalties [Member] The balance of unrecognized tax benefits and changes in the period. Commitments to lend on loans modified in TDRs Financing Receivable, Modified, Commitment to Lend Entity Registrant Name Entity Registrant Name Gain (loss) (net after-tax) recorded in AOCI related to derivatives designated as cash flow hedges expected to be reclassified to earnings over the next 12 months Cash Flow Hedge Gain (Loss) to be Reclassified within 12 Months Retirement Plan Name [Domain] Retirement Plan Name [Domain] Federal Reserve Discount Window Federal Reserve Discount Window [Member] Federal Reserve Discount Window [Member] Stock Price or TSR Estimation Method Stock Price or TSR Estimation Method [Text Block] Well- Capitalized Banking Regulation, Total Risk-Based Capital Ratio, Well Capitalized, Minimum Schedule Of Expected Maturity And Weighted Average Yield Of Securities [Line Items] Schedule Of Expected Maturity And Weighted Average Yield Of Securities [Line Items] Schedule of expected maturity and weighted average yield of securities line items. Depreciation and amortization expense Depreciation, Nonproduction Service charges and other customer-related fees Service Charges and Other Customer-Related Fees Amount of income earned from loan services (including debt and credit protection, over limit, membership and annual fees). Excludes interest income earned on credit card balances and transactions. State and Local Tax Jurisdiction, Other State and Local Tax Jurisdiction, Other [Member] Total Assets, Fair Value Disclosure Number of securities in gross unrealized loss positions Debt Securities, Available-for-Sale, Unrealized Loss Position, Number of Positions Deposits: Deposits [Abstract] Total Delinquent Loans Financial Asset, Past Due [Member] Equity investment without readily determinable fair value Equity Securities without Readily Determinable Fair Value, Amount Number of operating segments Number of Operating Segments Additional Information [Table] Income Tax, Examination [Table] Components of Deposits, Short-Term Borrowings and Long-Term Debt Schedule of Debt [Table Text Block] Granted (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value Cumulative Effect, Period of Adoption [Axis] Cumulative Effect, Period of Adoption [Axis] Collaborative Arrangement and Arrangement Other than Collaborative [Axis] Collaborative Arrangement and Arrangement Other than Collaborative [Axis] Schedule of Finite-Lived Intangible Assets Schedule of Finite-Lived Intangible Assets [Table Text Block] Restatement Determination Date: Restatement Determination Date [Axis] Number of consumer class action cases filed for cybersecurity incident Number of Consumer Class Action Cases Filed for Cybersecurity Incident Number of consumer class action cases filed for Cybersecurity Incident International taxes Deferred Foreign Income Tax Expense (Benefit) Gain on sale of discontinued operations Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax Accumulated Other Comprehensive Income (Loss) [Table] Accumulated Other Comprehensive Income (Loss) [Table] Number of reporting units Number of Reporting Units Total other long-term borrowings Other Long Term Borrowings [Member] Other Long Term Borrowings Total income Tax provision (benefit) Income Tax Expense (Benefit), Continuing Operations [Abstract] Due > 5 Years through 10 Years Debt Securities, Available-for-Sale, Maturity, Allocated and Single Maturity Date, Rolling after 5 through 10 Years, Amortized Cost Fair value of liabilities assumed: Business Combination, Recognized Liability Assumed, Liability [Abstract] All Currencies [Domain] All Currencies [Domain] Originations and purchases Payment for Origination and Purchase, Loan, Held-for-Sale Name Trading Arrangement, Individual Name Underlying Asset Class [Domain] Underlying Asset Class [Domain] Schedule of Short-term Debt [Table] Short-Term Debt [Table] Financing receivable, modified, subsequent default Amount Financing Receivable, Modified, Subsequent Default Loans held for sale Loan, Held-for-Sale, Fair Value Disclosure Senior and subordinated notes Unsecured Debt, Fair Value Disclosure Unsecured Debt, Fair Value Disclosure Due > 1 Year through 5 Years Debt Securities, Available-for-Sale, Maturity, Rolling after One Through Five Years, Weighted Average Yield Statement of Comprehensive Income [Abstract] Statement of Comprehensive Income [Abstract] Premises, equipment and software Deferred Tax Assets, Property, Plant and Equipment Preferred Stock Preferred Stock [Member] Schedule of Loss Sharing Arrangement Impact Schedule of Loss Sharing Arrangement Impact [Table Text Block] Schedule of loss sharing arrangement impact Name Awards Close in Time to MNPI Disclosures, Individual Name Income (loss) from continuing operations before income tax expense (benefit) Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest [Abstract] Unvested as of beginning of the period (in dollars per share) Unvested as of end of the period (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value Excluded component of fair value hedges Gain (Loss) from Components Excluded from Assessment of Fair Value Hedge Effectiveness, Net Other interest rate exposures Other Interest Rate Exposures [Member] Non-customer accommodation interest rate derivatives not designated as hedging instruments. Aggregate Erroneous Compensation Not Yet Determined Aggregate Erroneous Compensation Not Yet Determined [Text Block] Net Exposure Security Sold under Agreement to Repurchase, Including Not Subject to Master Netting Arrangement, after Offset and Deduction ICFR Auditor Attestation Flag ICFR Auditor Attestation Flag Loan origination fees and direct loan origination costs amortization period Loan Commitment and Origination Fees and Discounts or Premiums, Amortization Period Loan Commitment and Origination Fees and Discounts or Premiums, Amortization Period Treasury stock, value Treasury Stock, Value Compensation expense for restricted stock units APIC, Share-Based Payment Arrangement, Increase for Cost Recognition Securities Collateral Pledged Under Master Netting Agreements Derivative Liability, Fair Value of Collateral Defined Contribution Plan Disclosure [Line Items] Defined Contribution Plan Disclosure [Line Items] Unamortized premiums and discounts, deferred fees and costs Unamortized Loan Commitment and Origination Fees and Unamortized Discounts or Premiums Condensed Income Statement Condensed Income Statement [Table Text Block] Litigation Case [Axis] Litigation Case [Axis] Foreign Tax Authority Foreign Tax Jurisdiction [Member] Auditor Firm ID Auditor Firm ID Credit Loss Status [Domain] Credit Loss Status [Domain] Segments [Domain] Segments [Domain] Income Statement Location [Axis] Statement of Income Location, Balance [Axis] International Income (Loss) from Continuing Operations before Income Taxes, Foreign Other Other Loan Modifications [Member] Other Loan Modifications Remaining borrowing capacity Line of Credit Facility, Remaining Borrowing Capacity Investment Securities Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block] Defined benefit plan, benefit obligation Defined Benefit Plan, Benefit Obligation Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] Agency CMBS Commercial Mortgage Backed Securities - Agency [Member] Commercial Mortgage Backed Securities - Agency [Member] Balance Sheet Location [Domain] Statement of Financial Position Location, Balance [Domain] Accounting Standards Update and Change in Accounting Principle Accounting Standards Update and Change in Accounting Principle [Table Text Block] Other Effective Income Tax Rate Reconciliation, Tax Credit, Other, Percent Securities Available for Sale Securities available for sale: AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-Sale, Parent [Member] Derivative, collateral, obligation to return cash Derivative Asset, Subject to Master Netting Arrangement, Collateral, Obligation to Return Cash Not Offset Interest expense: Interest Expense, Operating and Nonoperating [Abstract] Less: Accumulated depreciation and amortization Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Interest-bearing deposits (see Table 2.5) Business Combination, Recognized Liability Assumed, Interest-Bearing Deposits Business Combination, Recognized Liability Assumed, Interest-Bearing Deposits Earnings Per Share Earnings Per Share, Policy [Policy Text Block] Voting Interest Entities Consolidation, Subsidiaries or Other Investments, Consolidated Entities, Policy [Policy Text Block] Allowance build for credit losses Allowance build (release) for credit losses Financing Receivable, Allowance for Credit Loss, Period Increase (Decrease) Revenue Recognition Revenue [Policy Text Block] Financial Instruments Derivative Liability, Subject to Master Netting Arrangement, Asset Offset Senior notes Senior Notes [Member] Purchases Payments to Acquire Debt Securities, Available-for-Sale Preferred stock (par value $0.01 per share; 50,000,000 shares authorized; 4,980,700 and 4,975,000 shares issued and outstanding as of December 31, 2025 and 2024, respectively) Preferred stock, value, issued Preferred Stock, Value, Issued Defined Contribution Plan [Table] Defined Contribution Plan [Table] Interest payable Interest Payable Term Loans by Vintage Year, Year 2 Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year Proceeds from share-based payment activities Proceeds from share-based payment activities Proceeds from Stock Plans Subordinated notes Subordinated Debt [Member] Financial Asset, Period Past Due [Axis] Financial Asset, Aging [Axis] All Executive Categories All Executive Categories [Member] Interest and fees forgiven Financing Receivable, Modified in Period, Accrued Interest, Amount Schedule of Significant Components of Deferred Tax Assets and Liabilities Schedule of Deferred Tax Assets and Liabilities [Table Text Block] Other changes Financing Receivable, Allowance For Credit Loss, Adjustments, Other Financing Receivable, Allowance For Credit Loss, Adjustments, Other Common stock (par value $0.01 per share; 1,000,000,000 shares authorized; 708,546,381 and 702,224,674 shares issued as of December 31, 2025 and 2024, respectively; 625,102,271 and 381,230,343 shares outstanding as of December 31, 2025 and 2024, respectively) Common Stock, Value, Issued Finance lease, right-of-use asset Finance Lease, Right-of-Use Asset, after Accumulated Amortization Loans, including loans held for sale Loans, Including Loans Held for Sale Interest and Fee Income, Loans and Leases Gains (losses) recognized on derivatives Change in Unrealized Gain (Loss) on Fair Value Hedging Instruments Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table] Launch and integration expenses Business Combination, Integration-Related Cost, Expense Federal funds purchased and securities loaned or sold under agreements to repurchase Federal Funds Purchased and Securities Loaned or Sold under Agreements to Repurchase, Fair Value Disclosure Commitments, contingencies and guarantees (see Note 19) Commitments and Contingencies Term loan by year, year 1 Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year, Writeoff Net cash received in acquisitions Cash Acquired from Acquisition Other Other Comprehensive Income (Loss), Before Tax, Attributable To Parent Other Comprehensive Income (Loss), Other, Before Tax, Attributable To Parent Other assets Gain (Loss) On Fair Value Other Assets Recognized In Earnings Gain (Loss) On Fair Value Other Assets measured on nonrecurring basis Business Combination [Axis] Business Combination [Axis] Funds available for dividend payments Statutory Accounting Practices, Statutory Amount Available for Dividend Payments Investment Program, Proportional Amortization Method, Elected, Income Tax Credit and Other Income Tax Benefit, before Amortization, Statement of Income or Comprehensive Income [Extensible Enumeration] Investment Program, Proportional Amortization Method, Elected, Income Tax Credit and Other Income Tax Benefit, before Amortization, Statement of Income or Comprehensive Income [Extensible Enumeration] Short-Term Debt [Line Items] Short-Term Debt [Line Items] Net deferred tax assets Deferred Tax Assets, Net Total Liabilities Hedged Liability, Fair Value Hedge, Cumulative Increase (Decrease) Net charge-offs Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery PEO Actually Paid Compensation Amount PEO Actually Paid Compensation Amount Diluted earnings per common share: Earnings Per Share, Diluted [Abstract] New Markets Effective Income Tax Rate Reconciliation, Tax Credit, New Markets, Percent Effective Income Tax Rate Reconciliation, Tax Credit, New Markets, Percent Total Term Loans Financing Receivable, Excluding Accrued Interest, Before Allowance for Credit Loss, Term Loans Financing Receivable, Excluding Accrued Interest, Before Allowance for Credit Loss, Term Loans 60-89 days Financial Asset, 60 to 89 Days Past Due [Member] Hedging Designation [Axis] Hedging Designation [Axis] Effects of Fair Value and Cash Flow Hedge Accounting Schedule of Derivatives Instruments Statements of Financial Performance and Financial Position, Location [Table Text Block] Other Other Other Interest and Dividend Income Deferred tax liability Business Combination, Recognized Liability Assumed, Deferred Tax Liability Schedule of Reconciliation of Change in Unrecognized Tax Benefits Schedule of Unrecognized Tax Benefits Roll Forward [Table Text Block] Discount and interchange fees, net Interchange Fees, Net Revenues earned from switch fees charged to financial institutions for accessing our network to process transactions and other fees, net of reward costs. Loans held for sale Gain (Loss) On Fair Value Loans Held For Sale Recognized In Earnings Gain (Loss) On Fair Value Loans Held For Sale measured on nonrecurring basis Net Exposure Derivative Liability, Including Not Subject to Master Netting Arrangement, after Offset and Deduction CALIFORNIA CALIFORNIA Other comprehensive gain (loss) Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax Net investment hedges Net investment hedges Net Investment Hedging [Member] Derivative Contract [Domain] Derivative Contract [Domain] Financing Receivable, Allowance for Credit Loss [Table] Financing Receivable, Allowance for Credit Loss [Table] Net proceeds from issuances Proceeds from Issuance of Common Stock Gross realized losses Debt Securities, Available-for-Sale, Realized Loss All Individuals All Individuals [Member] Issuances Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Issues Long-term Debt, Type [Domain] Long-Term Debt, Type [Domain] Discover Network Network [Member] Network Fair Value Disclosures [Abstract] Fair Value Disclosures [Abstract] Changes in premises and equipment Payments to Acquire Property, Plant, and Equipment Name Forgone Recovery, Individual Name Maximum contractual term (in years) Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Period 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] Net change from discontinued operations Cash Provided by (Used in) Operating Activity, Discontinued Operation Reclassification out of Accumulated Other Comprehensive Income Reclassification out of Accumulated Other Comprehensive Income [Member] Retained interests, measurement input Retained Interest, Measurement Input Value of input used to measure portion of interest continued to be held by a transferor after transferring financial assets to a third party Nonperforming Loans Without an Allowance Financing Receivable, Nonaccrual, No Allowance Domestic credit card: Geographic Distribution, Domestic [Member] Federal funds purchased and securities loaned or sold under agreements to repurchase Federal Funds Purchased and Securities Sold under Agreements to Repurchase [Member] Government Contracts Concentration Risk Government Contracts Concentration Risk [Member] Revolving loans converted to term during period Financing Receivable, Revolving, Converted to Term Loan During Period Term loan by year, year 5 Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year, Writeoff Premises, Equipment and Leases Property Plant Equipment and Operating Lease Commitments Disclosure [Text Block] Disclosure of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale. This includes assets that are purchased or leased. Examples include land, building and production equipment. This disclosure may include a schedule of property, plant and equipment gross, depreciation, and net, accumulated depreciation, depletion, useful lives, and income statement disclosures. Erroneous Compensation Analysis Erroneous Compensation Analysis [Text Block] Acquired loans held for investment, premium Business Combination, Fair Value of Acquired Loans Held for Investment, Premium Business Combination, Fair Value of Acquired Loans Held for Investment, Premium Other borrowings Other Borrowings Commercial Banking: Commercial Portfolio Segment [Member] Number of shares of Capital One treasury stock reissued in the acquisition before fractional shares adjustment (in shares) Treasury Stock Issued, Fractional Shares, Adjustment Treasury Stock Issued, Fractional Shares, Adjustment Nature of Uncertainty [Axis] Nature of Uncertainty [Axis] Rule 10b5-1 Arrangement Terminated Rule 10b5-1 Arrangement Terminated [Flag] Cash Collateral Pledged Repurchase Agreement, Collateral, Right To Reclaim Cash, Offset Repurchase agreement, collateral, right to reclaim cash, offset Credit card loan securitizations Credit Card Receivable [Member] 620 or below FICO Score, Less Than 620 [Member] FICO Score, Less Than 620 [Member] Erroneously Awarded Compensation Recovery Erroneously Awarded Compensation Recovery [Table] Concentration Risk Benchmark [Domain] Concentration Risk Benchmark [Domain] Title of 12(b) Security Title of 12(b) Security Income before income taxes and equity in undistributed earnings of subsidiaries Income (Loss) from Continuing Operations before Equity in Undistributed Earnings of Subsidiaries Income (Loss) from Continuing Operations before Equity in Undistributed Earnings of Subsidiaries Due in 1 Year or Less Debt Securities, Available-for-Sale, Maturity, Allocated and Single Maturity Date, Rolling within One Year, Amortized Cost All other Effective Income Tax Rate Reconciliation, Other Reconciling Items, Amount Other comprehensive income (loss), net of tax: After Tax Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent [Abstract] Earnings Per Share [Abstract] Earnings Per Share [Abstract] 2030 Lessee, Operating Lease, Liability, to be Paid, Year Five Mortgage servicing rights Deferred Tax Liabilities, Mortgage Servicing Rights Capital Ratio Common Equity Tier One Capital to Risk-Weighted Assets Common equity Tier 1 capital ratio is a regulatory capital measure under Basel III calculated based on common equity Tier 1 capital divided by risk-weighted assets. Term loan by year, year 3 Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year, Writeoff Net income (expense) recognized on fair value hedges Gain (Loss) on Fair Value Hedges Recognized in Earnings Purchase price allocation for restricted stock awards related to the Transaction Adjustments to Additional Paid in Capital, Other Short-term Debt, Type [Axis] Short-Term Debt, Type [Axis] Combined allowance and reserve Combined Allowance And Unfunded Reserve [Member] Combined allowance and unfunded reserve. Total Debt Securities, Available-for-Sale, Weighted Average Yield Class of Securities [Domain] Security Class [Domain] [Domain] for Security Class Amortization of intangibles Amortization and Impairment of Intangibles Amortization and impairment of Intangibles Effect of dilutive securities: Weighted Average Number of Shares Outstanding, Diluted, Adjustment [Abstract] 2030 Time Deposit Maturities With Contractual Maturity Dates, Year Five Time Deposit Maturities With Contractual Maturity Dates, Year Five Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] Financing Receivable, Allowance for Credit Loss [Line Items] Financing Receivable, Allowance for Credit Loss [Line Items] Award Timing Disclosures [Line Items] Other Interest income - Other [Member] Interest income - Other [Member] Measurement Frequency [Domain] Measurement Frequency [Domain] Short-term FHLB advances Federal Home Loan Bank Advances [Member] Variable Interest Entities and Securitization [Abstract] Variable Interest Entities and Securitization [Abstract] Variable Interest Entities and Securitization [Abstract] Loss severity Measurement Input, Loss Severity [Member] Total Delinquent Loans, percentage of total loans Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent, Percent, Total Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent, Percent, Total Gross Amounts Security Sold under Agreement to Repurchase, Subject to Master Netting Arrangement, before Offset Servicing asset at amortized cost, amortization Servicing Asset at Amortized Cost, Amortization Consumer Banking Consumer Banking Segment [Member] Consists of our branch-based lending and deposit gathering activities for small business customers, as well as branch-based consumer deposit gathering and lending activities, national deposit gathering, national automobile lending, consumer mortgage lending and servicing activities. Stockholders' Equity Equity [Text Block] State taxes Deferred State and Local Income Tax Expense (Benefit) Loan Restructuring Modification [Domain] Loan Restructuring Modification [Domain] Issuances of common stock and restricted stock, net of forfeitures Stock Issued During Period, Value, New Issues and Restricted Stock, Net of Forfeitures Stock Issued During Period, Value, New Issues and Restricted Stock, Net of Forfeitures Net loans held for investment Financing Receivable, Excluding Accrued Interest, after Allowance for Credit Loss Income before equity in undistributed earnings of subsidiaries Income Before Equity In Undistributed Net Income Of Subsidiary Income Before Equity In Undistributed Net Income Of Subsidiary Net income Net income Net income Net Income (Loss) Attributable to Parent Subsequent Event [Table] Subsequent Event [Table] Business combination, provisional information, initial accounting incomplete, adjustment, assets of discontinued operations Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Assets of Discontinued Operations Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Assets of Discontinued Operations Capital Ratio Banking Regulation, Total Risk-Based Capital Ratio, Actual In progress Construction in Progress [Member] Schedule of Effective Income Tax Rate Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] Award vesting period (in years) Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period Other Effective Income Tax Rate Reconciliation, Other Adjustments, Percent Current, percentage of total loans Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Current, Percent, Total Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Current, Percent, Total Segment Reporting Information [Line Items] Segment Reporting Information [Line Items] Preferred stock, shares authorized (in shares) Preferred Stock, Shares Authorized Purchases of treasury stock Purchases of treasury stock Payments for Repurchase of Common Stock Adoption Date Trading Arrangement Adoption Date Percentage, Nonperforming Loans Without an Allowance Financing Receivable, Nonaccrual, No Allowance, Percent Past Due Financing Receivable, Nonaccrual, No Allowance, Percent Past Due Financing Receivable, Past Due [Table] Financing Receivable, Past Due [Table] Interest-bearing deposits Interest-Bearing Deposits [Member] Weighted-average yield for securities available for sale Available-for-sale Securities, Weighted Average Yield [Abstract] Available-for-sale Securities, Weighted Average Yield [Abstract] Depositary Shares, Each Representing a 1/40th Interest in a Share of Fixed Rate Non-Cumulative Perpetual Preferred Stock, Series L Series L Series L Preferred Stock [Member] Outstanding nonredeemable series L preferred stock or outstanding series L preferred stock. Classified within stockholders' equity if nonredeemable or redeemable solely at the option of the issuer. Classified within temporary equity if redemption is outside the control of the issuer. Purchased credit card relationships Customer Relationships [Member] Offsetting Liabilities Offsetting Liabilities [Table Text Block] Cash payments to settle awards Share-Based Payment Arrangement, Cash Used to Settle Award Retained earnings Retained Earnings (Accumulated Deficit) Interchange fees, net Interchange Fees, Contracts [Member] Interchange Fees, Contracts [Member] 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] Uncollectible portion of billed finance charges and fees Uncollectible Portion of Billed Finance Charges and Fees Uncollectible Portion of Billed Finance Charges and Fees Class of Stock [Axis] Class of Stock [Axis] Number of active stock plans Number of Active Stock Plans Number of Active Stock Plans Hedging relationships: Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member] Subsequent Event Type [Domain] Subsequent Event Type [Domain] Impairment of intangible assets, finite-lived Impairment of Intangible Assets, Finite-Lived 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] Other liabilities Deferred Tax Liabilities, Other Retirement Plan Type [Axis] Retirement Plan Type [Axis] Percentage of target award opportunities Share-based Compensation Arrangement by Share-based Payment Award, Percentage of Target Number of Common Shares Granted Share-based Compensation Arrangement by Share-based Payment Award, Percentage of Target Number of Common Shares Granted Statement [Table] Statement [Table] Business Combination Business Combination [Table Text Block] Deferred tax benefit Total deferred provision (benefit) Deferred Income Tax Expense (Benefit) Financing activities: Cash Provided by (Used in) Financing Activity, Including Discontinued Operation [Abstract] Nondeductible FDIC Premiums Effective Income Tax Rate Reconciliation, Nondeductible Expense, FDIC, Amount Effective Income Tax Rate Reconciliation, Nondeductible Expense, FDIC, Amount Beginning balance (in shares) Ending balance (in shares) Shares, Issued Deposits with defined maturities Deposits with Defined Maturities Deposits with Defined Maturities, Fair Value Disclosure Discount on redeemed preferred stock Discount For Preferred Stock Redeemed Issuance cost for preferred stock redeemed Credit Card: Credit Card Portfolio Segment [Member] Credit Card Portfolio Segment [Member] Retail banking Retail Banking [Member] Any loan or extension of credit to an individual for personal, family, or household. Summary of Significant Accounting Policies Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block] Schedule of Level 3 Inputs Reconciliation 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 Recognized tax benefit from stock-based compensation arrangements Share-Based Payment Arrangement, Expense, Tax Benefit Shares authorized under plans (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized Condensed Income Statements, Captions [Line Items] Condensed Income Statements, Captions [Line Items] Treasury stock, at cost (par value $0.01 per share; 83,444,110 and 320,994,331 shares as of December 31, 2025 and 2024, respectively) Treasury Stock, Common, Value Other assets: Other Assets, Fair Value Disclosure [Abstract] Other Assets, Fair Value Disclosure [Abstract] Termination Date Trading Arrangement Termination Date Interest-bearing deposits and other short-term investments Interest-Bearing Deposits in Banks and Other Financial Institutions Insider Trading Policies and Procedures Adopted Insider Trading Policies and Procedures Adopted [Flag] Allowance for credit losses Allowance for credit losses Balance at beginning of the period Balance at the end of the period Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest Minimum Capital Adequacy Minimum Capital Adequacy for Supplementary Leverage Ratio The minimum amount of supplementary leverage ratio required for capital adequacy to average assets as defined in the regulations Weighted-average discount rate Operating Lease, Weighted Average Discount Rate, Percent Exchange ratio Common stock, Exchange Ratio Common stock, Exchange Ratio Total weighted-average basic common shares outstanding (in shares) Weighted Average Number of Shares Outstanding, Basic Portion of balance that if recognized, would impact the effective income tax rate Unrecognized Tax Benefits that Would Impact Effective Tax Rate Other borrowings Other Borrowings Fair Value Disclosure This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure and may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. This item represents the aggregate of other miscellaneous borrowings owed by the company as of the balance sheet date. Schedule of Computation of Basic and Diluted Earnings Per Common Share Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Derivative assets, gross amount Gross Amounts Derivative Asset, Gross Asset Including Not Subject to Master Netting Arrangement Deposit Liabilities, Type Deposit Liabilities, Type [Table Text Block] Subsequent Events [Abstract] Segment Reporting [Abstract] Segment Reporting [Abstract] Defined benefit plan, cost of providing special and contractual termination benefits Defined Benefit Plan, Cost of Providing Special and Contractual Termination Benefits Debt Securities, Available-for-Sale, Realized Gain (Loss), Excluding Other-than-temporary Impairment [Abstract] Debt Securities, Available-for-Sale, Realized Gain (Loss), Excluding Other-than-temporary Impairment [Abstract] Total Term Loans Total Term Loans Financing Receivable, Excluding Accrued Interest, Term Writeoff Debt Disclosure [Abstract] Expected benefits to be paid in the next ten years Defined Benefit Plan, Expected Future Benefit Payment, Next 10 Years Amount of benefits for defined benefit plan expected to be paid in the next ten years following latest fiscal year. Supplementary leverage Supplementary leverage [Abstract] Supplementary leverage [Abstract] Defined Benefit Plan, Overfunded Plan Defined Benefit Plan, Overfunded Plan [Member] Total, Fiscal Year Maturity: Time Deposits Maturities With Contractual Maturity Dates, Debt, Long-term and Short-term, Combined Amount, Fiscal Year Maturity [Abstract] Time Deposits Maturities With Contractual Maturity Dates, Debt, Long-term and Short-term, Combined Amount, Fiscal Year Maturity [Abstract] Derivative liabilities Offsetting Derivative Liabilities [Abstract] Net realized gains (losses) Debt Securities, Available-for-Sale, Realized Gain (Loss) FHLB advances FHA Advances [Member] FHA Advances Forgone Recovery due to Expense of Enforcement, Amount Forgone Recovery due to Expense of Enforcement, Amount 2027 Time Deposit Maturities With Contractual Maturity Dates, Year Two Time Deposit Maturities With Contractual Maturity Dates, Year Two Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] Common stock, par value (in dollars per share) Common Stock, Par or Stated Value Per Share Consolidated Entities [Axis] Consolidated Entities [Axis] Less: Number of fractional shares (in shares) Number of Fractional Shares Number of Fractional Shares Interest payable Interest Payable Fair Value Disclosure This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure and may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. This item represents accrued interest payable on all forms of debt, including trade payables, that has been incurred and is unpaid as of the balance sheet date. Geographic Distribution [Axis] Geographic Distribution [Axis] Cross-border taxes Effective Income Tax Rate Reconciliation, Cross-Border Tax Effect, Amount Provision (Benefit) Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent, Parenthetical Disclosure [Abstract] Use of Estimates Use of Estimates, Policy [Policy Text Block] Guarantor Obligations, Nature [Axis] Guarantor Obligations, Nature [Axis] Settlements Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements Capital Amount Banking Regulation, Total Capital, Actual Other comprehensive income (loss) Other comprehensive income (loss), tax portion attributable to parent Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent Occupancy and equipment Occupancy, Net Financial Instruments Derivative Asset, Subject to Master Netting Arrangement, Liability Offset Subsequent Events Subsequent Events [Text Block] Insider Trading Arrangements [Line Items] Prior Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year Business combination, pro forma net interest income Business Combination, Pro Forma Net Interest Income Business Combination, Pro Forma Net Interest Income Current Financial Asset, Not Past Due [Member] Allowance for credit losses Allowance for Credit Losses Debt Securities, Available-for-Sale, Allowance for Credit Loss, Excluding Accrued Interest Net unrealized loss on securities Deferred Tax Assets, Security and Loan Valuations Deferred tax assets security and loan valuations. Total liabilities Carrying Amount of Liabilities Liabilities Antidilutive Securities, Name [Domain] Antidilutive Securities, Name [Domain] Currency [Axis] Currency [Axis] Settlements Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Settlements Gross Unrecognized Tax Benefits Gross Unrecognized Tax Benefits [Member] The balance of unrecognized tax benefits and changes in the period. Designated hedged items Financial Asset, Closed Portfolio, Portfolio Layer Method, Amortized Cost Pension Adjustments Prior Service Cost Pension Adjustments Prior Service Cost [Member] Additions for tax positions related to the current year Unrecognized Tax Benefits, Increase Resulting from Current Period Tax Positions Proceeds from paydowns and maturities of securities available for sale Proceeds from Sale and Maturity of Debt Securities, Available-for-Sale Loans Loans, Notes, Trade and Other Receivables, Excluding Allowance for Credit Losses [Text Block] Material Terms of Trading Arrangement Material Terms of Trading Arrangement [Text Block] Financial Instrument Performance Status [Domain] Financial Instrument Performance Status [Domain] Maturities and paydowns of senior and subordinated notes Maturities of Senior Debt Thereafter Time Deposits Maturities With Contractual Maturity Dates and Long-Term Debt Maturities, After Year Five Time Deposits Maturities With Contractual Maturity Dates and Long-Term Debt Maturities, After Year Five Issuances of preferred stock related to the Transaction Stock Issued During Period, Value, New Issues Discover Card Product Misclassification Discover Card Product Misclassification [Member] Discover Card Product Misclassification Asset-backed Securities Asset-Backed Securities [Member] Consolidation Items [Axis] Consolidation Items [Axis] Counterparty Name [Axis] Counterparty Name [Axis] Fixed unsecured subordinated debt Fixed Unsecured Subordinated Debt [Member] Fixed unsecured subordinated debt. Total senior and subordinated notes Senior and subordinated notes Senior And Subordinated Notes [Member] Senior and subordinated notes. Securities available for sale Debt Securities, Available-for-Sale Other loan commitments Other Portfolio Segments, Excluding Credit Card [Member] Other Portfolio Segments, Excluding Credit Card [Member] Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Defined contribution plan, age eligible to participate Defined Contribution Plan, Age Eligible to Participate Defined Contribution Plan, Age Eligible to Participate Non-NEOs Non-NEOs [Member] Series P Series P Preferred Stock [Member] Series P Preferred Stock Investment Program, Proportional Amortization Method, Applied, Amortization Expense, Statement of Cash Flows [Extensible Enumeration] Investment Program, Proportional Amortization Method, Applied, Amortization Expense, Statement of Cash Flows [Extensible Enumeration]