v3.26.1
Schedule H, Line 4i – Schedule of Assets (Held At End of Year) (Details) - EBP 002 - USD ($)
12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
EBP, Schedule of Asset Held for Investment [Line Items]    
Entity tax identification number 54-1719854  
Plan number 002  
Current Value $ 14,436,378,403  
Notes receivable from participants 209,666,914  
Total as of December 31, 2025 18,332,173,219  
Investment, Identifier [Axis]: Capital One Stock Fund    
EBP, Schedule of Asset Held for Investment [Line Items]    
Current Value 618,370,747 $ 475,332,439
Total Value of Holdings 618,417,462  
Investment, Identifier [Axis]: Capital One Stock Fund 1    
EBP, Schedule of Asset Held for Investment [Line Items]    
Current Value $ 618,417,462  
Investment, Identifier [Axis]: Capital One Stock Fund | (CASH)    
EBP, Schedule of Asset Held for Investment [Line Items]    
Number of shares (in shares) 1  
Current Value $ 0.72  
Investment, Identifier [Axis]: Capital One Stock Fund | CAPITAL ONE FINANCIAL CORP    
EBP, Schedule of Asset Held for Investment [Line Items]    
Number of shares (in shares) 2,483,012  
Current Value $ 601,782,788.32  
Investment, Identifier [Axis]: Capital One Stock Fund | Cash & equivalents    
EBP, Schedule of Asset Held for Investment [Line Items]    
Cash and equivalents 16,587,958  
Current Value $ 16,587,958  
Investment, Identifier [Axis]: Capital One Stock Fund | Corporate common stock    
EBP, Schedule of Asset Held for Investment [Line Items]    
Number of shares (in shares) 2,483,012  
Current Value $ 601,782,789  
Investment, Identifier [Axis]: Capital One Stock Fund | FIMM MM Government Portfolio - Instl Cl    
EBP, Schedule of Asset Held for Investment [Line Items]    
Number of shares (in shares) 16,587,958  
Current Value $ 16,634,672.96  
Investment, Identifier [Axis]: Collective Investment Trusts | Fidelity Series Global ex U.S. Index Fund    
EBP, Schedule of Asset Held for Investment [Line Items]    
Number of shares (in shares) 1,832,536  
Investment, Identifier [Axis]: Collective Investment Trusts | BlackRock LifePath 2030    
EBP, Schedule of Asset Held for Investment [Line Items]    
Number of shares (in shares) 8,096,259  
Current Value $ 359,916,785  
Investment, Identifier [Axis]: Collective Investment Trusts | BlackRock LifePath 2035    
EBP, Schedule of Asset Held for Investment [Line Items]    
Number of shares (in shares) 10,283,488  
Current Value $ 524,155,576  
Investment, Identifier [Axis]: Collective Investment Trusts | BlackRock LifePath 2040    
EBP, Schedule of Asset Held for Investment [Line Items]    
Number of shares (in shares) 12,270,135  
Current Value $ 706,617,465  
Investment, Identifier [Axis]: Collective Investment Trusts | BlackRock LifePath 2045    
EBP, Schedule of Asset Held for Investment [Line Items]    
Number of shares (in shares) 14,792,769  
Current Value $ 948,627,767  
Investment, Identifier [Axis]: Collective Investment Trusts | BlackRock LifePath 2050    
EBP, Schedule of Asset Held for Investment [Line Items]    
Number of shares (in shares) 15,812,191  
Current Value $ 1,098,275,271  
Investment, Identifier [Axis]: Collective Investment Trusts | BlackRock LifePath 2055    
EBP, Schedule of Asset Held for Investment [Line Items]    
Number of shares (in shares) 20,003,307  
Current Value $ 1,021,054,824  
Investment, Identifier [Axis]: Collective Investment Trusts | BlackRock LifePath 2060    
EBP, Schedule of Asset Held for Investment [Line Items]    
Number of shares (in shares) 26,149,109  
Current Value $ 760,774,344  
Investment, Identifier [Axis]: Collective Investment Trusts | BlackRock LifePath 2065    
EBP, Schedule of Asset Held for Investment [Line Items]    
Number of shares (in shares) 14,401,600  
Current Value $ 298,553,827  
Investment, Identifier [Axis]: Collective Investment Trusts | BlackRock LifePath 2070    
EBP, Schedule of Asset Held for Investment [Line Items]    
Number of shares (in shares) 718,545  
Current Value $ 8,671,627  
Investment, Identifier [Axis]: Collective Investment Trusts | BlackRock LifePath Retirement    
EBP, Schedule of Asset Held for Investment [Line Items]    
Number of shares (in shares) 8,018,857  
Current Value $ 239,317,986  
Investment, Identifier [Axis]: Collective Investment Trusts | BlackRock Russell 2500 Index Fund    
EBP, Schedule of Asset Held for Investment [Line Items]    
Number of shares (in shares) 5,922,588  
Current Value $ 334,191,421  
Investment, Identifier [Axis]: Collective Investment Trusts | BlackRock Strategic Completion    
EBP, Schedule of Asset Held for Investment [Line Items]    
Number of shares (in shares) 1,366,148  
Current Value $ 20,819,289  
Investment, Identifier [Axis]: Collective Investment Trusts | BlackRock U.S. Debt Index    
EBP, Schedule of Asset Held for Investment [Line Items]    
Number of shares (in shares) 7,380,857  
Current Value $ 120,691,787  
Investment, Identifier [Axis]: Collective Investment Trusts | Fidelity Series Global ex U.S. Index Fund    
EBP, Schedule of Asset Held for Investment [Line Items]    
Current Value $ 340,869,949  
Investment, Identifier [Axis]: Collective Investment Trusts | Prudential Core Plus Bond Fund    
EBP, Schedule of Asset Held for Investment [Line Items]    
Number of shares (in shares) 2,037,421  
Current Value $ 410,397,812  
Investment, Identifier [Axis]: Collective Investment Trusts | State Street S&P 500 Index Fund    
EBP, Schedule of Asset Held for Investment [Line Items]    
Number of shares (in shares) 28,723,778  
Current Value $ 4,377,618,687  
Investment, Identifier [Axis]: Fidelity BrokerageLink    
EBP, Schedule of Asset Held for Investment [Line Items]    
Current Value 553,611,158 381,537,064
Investment, Identifier [Axis]: Fidelity Global ex U.S. Index Fund    
EBP, Schedule of Asset Held for Investment [Line Items]    
Current Value 0 227,764,852
Investment, Identifier [Axis]: Fully Benefit -Responsive Investment Contracts | Capital One Stable Value Fund (Invesco)    
EBP, Schedule of Asset Held for Investment [Line Items]    
Current Value 509,206,929  
Investment, Identifier [Axis]: Fully Benefit-Responsive Investment Contracts | Cash & equivalents    
EBP, Schedule of Asset Held for Investment [Line Items]    
Cash and equivalents 14,014,817  
Current Value 14,094,805  
Investment, Identifier [Axis]: Fully Benefit-Responsive Investment Contracts | IGT Dodge & Cox Core Fixed Income Fund    
EBP, Schedule of Asset Held for Investment [Line Items]    
Current Value 26,028,915  
Investment, Identifier [Axis]: Fully Benefit-Responsive Investment Contracts | IGT Invesco Core Fixed Income Fund    
EBP, Schedule of Asset Held for Investment [Line Items]    
Current Value 26,015,370  
Investment, Identifier [Axis]: Fully Benefit-Responsive Investment Contracts | IGT Invesco Intermediate Fund    
EBP, Schedule of Asset Held for Investment [Line Items]    
Current Value 51,998,486  
Investment, Identifier [Axis]: Fully Benefit-Responsive Investment Contracts | IGT Invesco Short Term Bond Fund    
EBP, Schedule of Asset Held for Investment [Line Items]    
Current Value 235,040,063  
Investment, Identifier [Axis]: Fully Benefit-Responsive Investment Contracts | IGT Jennison Intermediate Fund    
EBP, Schedule of Asset Held for Investment [Line Items]    
Current Value 51,983,586  
Investment, Identifier [Axis]: Fully Benefit-Responsive Investment Contracts | IGT Loomis Sayles Core Fixed Income Fund    
EBP, Schedule of Asset Held for Investment [Line Items]    
Current Value 26,010,199  
Investment, Identifier [Axis]: Fully Benefit-Responsive Investment Contracts | IGT Loomis Sayles Intermediate Fund    
EBP, Schedule of Asset Held for Investment [Line Items]    
Current Value 25,998,383  
Investment, Identifier [Axis]: Fully Benefit-Responsive Investment Contracts | IGT Pimco Core Fixed Income Fund    
EBP, Schedule of Asset Held for Investment [Line Items]    
Current Value 26,013,089  
Investment, Identifier [Axis]: Fully Benefit-Responsive Investment Contracts | IGT Pimco Intermediate Fund    
EBP, Schedule of Asset Held for Investment [Line Items]    
Current Value $ 26,024,033  
Investment, Identifier [Axis]: Fully Benefit-Responsive Investment Contracts | Wrapped holdings    
EBP, Schedule of Asset Held for Investment [Line Items]    
Number of shares (in shares) 507,086,870  
Current Value $ 495,112,124  
Investment, Identifier [Axis]: International Equity Fund    
EBP, Schedule of Asset Held for Investment [Line Items]    
Current Value 645,574,128.82 486,423,198
Total Value of Holdings $ 645,433,746.03  
Investment, Identifier [Axis]: International Equity Fund | AMERICAN CENTURY NON-U.S. CONCENTRATED GROWTH (EAF    
EBP, Schedule of Asset Held for Investment [Line Items]    
Number of shares (in shares) 6,759,624  
Current Value $ 112,182,723.64  
Investment, Identifier [Axis]: International Equity Fund | INTL EQ EAFE CIT M    
EBP, Schedule of Asset Held for Investment [Line Items]    
Number of shares (in shares) 751,963  
Current Value $ 211,676,525.59  
Investment, Identifier [Axis]: International Equity Fund | INVESTEC EM LLC    
EBP, Schedule of Asset Held for Investment [Line Items]    
Number of shares (in shares) 529,608  
Current Value $ 128,403,426.14  
Investment, Identifier [Axis]: International Equity Fund | SCHRODER INTERNATIONAL MULTI-CAP VALUE TRUST M    
EBP, Schedule of Asset Held for Investment [Line Items]    
Number of shares (in shares) 7,222,635  
Current Value $ 168,792,972.38  
Investment, Identifier [Axis]: International Equity Fund | SPARTAN GLOBAL EX US INDEX POOL - CLASS D    
EBP, Schedule of Asset Held for Investment [Line Items]    
Number of shares (in shares) 131,813  
Current Value $ 24,518,481.07  
Investment, Identifier [Axis]: Notes receivable from participants    
EBP, Schedule of Asset Held for Investment [Line Items]    
Current Value 215,034,471 163,195,712
Investment, Identifier [Axis]: Participant-Directed Brokerage Accounts | Fidelity BrokerageLink    
EBP, Schedule of Asset Held for Investment [Line Items]    
Current Value 553,611,158  
Investment, Identifier [Axis]: Self Managed Funds | International Equity Fund    
EBP, Schedule of Asset Held for Investment [Line Items]    
Current Value 645,574,129  
Investment, Identifier [Axis]: Self Managed Funds | U.S. Small/Mid Cap Equity Fund    
EBP, Schedule of Asset Held for Investment [Line Items]    
Current Value 539,061,023  
Investment, Identifier [Axis]: Spartan Global ex U.S. Index Fund    
EBP, Schedule of Asset Held for Investment [Line Items]    
Current Value 340,869,949 0
Investment, Identifier [Axis]: Stable Value Fund    
EBP, Schedule of Asset Held for Investment [Line Items]    
Current Value 509,206,928.79  
Total Value of Holdings $ 522,549,500.91  
Investment, Identifier [Axis]: Stable Value Fund | FIMM MM Government Portfolio - Instl Cl    
EBP, Schedule of Asset Held for Investment [Line Items]    
Number of shares (in shares) 14,014,817  
Current Value $ 14,094,804.5  
Investment, Identifier [Axis]: Stable Value Fund | MASSACHUSETTS MUTUAL WBS    
EBP, Schedule of Asset Held for Investment [Line Items]    
Current Value 80,159,425.97  
Investment, Identifier [Axis]: Stable Value Fund | METROPOLITAN LIFE INC CO SICN    
EBP, Schedule of Asset Held for Investment [Line Items]    
Current Value 87,900,948.62  
Investment, Identifier [Axis]: Stable Value Fund | PACIFIC LIFE INS CO ACT    
EBP, Schedule of Asset Held for Investment [Line Items]    
Current Value 78,099,248.07  
Investment, Identifier [Axis]: Stable Value Fund | PRUDENTIAL INS CO AMERICA ACT    
EBP, Schedule of Asset Held for Investment [Line Items]    
Current Value 85,445,426.28  
Investment, Identifier [Axis]: Stable Value Fund | TRANSAMERICA PREMIER LIFE ACT    
EBP, Schedule of Asset Held for Investment [Line Items]    
Current Value 84,893,096.41  
Investment, Identifier [Axis]: Stable Value Fund | VOYA ACT    
EBP, Schedule of Asset Held for Investment [Line Items]    
Current Value $ 78,613,978.94  
Investment, Identifier [Axis]: State Street S&P 500 Index Non-Lending Series Fund    
EBP, Schedule of Asset Held for Investment [Line Items]    
Number of shares (in shares) 28,723,778  
Current Value $ 4,377,618,687.17  
Investment, Identifier [Axis]: State Street S&P 500® Index Non-Lending Series Fund    
EBP, Schedule of Asset Held for Investment [Line Items]    
Current Value 4,377,618,687.17  
Total Value of Holdings 4,377,590,614.97  
Investment, Identifier [Axis]: Transfer due from Discover Financial Services 401k Plan    
EBP, Schedule of Asset Held for Investment [Line Items]    
Current Value 3,686,127,902  
Investment, Identifier [Axis]: U.S. Large Cap Equity Fund    
EBP, Schedule of Asset Held for Investment [Line Items]    
Current Value 0 1,082,944,502
Investment, Identifier [Axis]: U.S. Small / Mid Cap Equity Fund    
EBP, Schedule of Asset Held for Investment [Line Items]    
Current Value 539,905,720.18  
Total Value of Holdings $ 539,903,297.46  
Investment, Identifier [Axis]: U.S. Small / Mid Cap Equity Fund | CAPITAL ONE RIVER RD SMID    
EBP, Schedule of Asset Held for Investment [Line Items]    
Number of shares (in shares) 4,654,032  
Current Value $ 103,822,155.92  
Investment, Identifier [Axis]: U.S. Small / Mid Cap Equity Fund | CAPITAL ONE WILLIAM SMID    
EBP, Schedule of Asset Held for Investment [Line Items]    
Number of shares (in shares) 3,486,699  
Current Value $ 61,407,745.64  
Investment, Identifier [Axis]: U.S. Small / Mid Cap Equity Fund | FRONTIER SMALL CAP GROWTH CIT - CLASS A    
EBP, Schedule of Asset Held for Investment [Line Items]    
Number of shares (in shares) 5,187,302  
Current Value $ 63,648,196.1  
Investment, Identifier [Axis]: U.S. Small / Mid Cap Equity Fund | Russell 2500 Index Fund F    
EBP, Schedule of Asset Held for Investment [Line Items]    
Number of shares (in shares) 36,792  
Current Value $ 2,076,059.92  
Investment, Identifier [Axis]: U.S. Small / Mid Cap Equity Fund | VICTORY CAPITAL SMID    
EBP, Schedule of Asset Held for Investment [Line Items]    
Number of shares (in shares) 12,249,986  
Current Value $ 158,723,066.59  
Investment, Identifier [Axis]: U.S. Small / Mid Cap Equity Fund | Wellington CIF II SMID Cap Research S7    
EBP, Schedule of Asset Held for Investment [Line Items]    
Number of shares (in shares) 13,531,208  
Current Value $ 150,228,496.01  
Investment, Identifier [Axis]: U.S. Small/Mid Cap Equity Fund    
EBP, Schedule of Asset Held for Investment [Line Items]    
Current Value $ 539,061,023 $ 555,387,267