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Business Combinations and Discontinued Operations - Business Combination (Details)
$ / shares in Units, $ in Millions
 7 Months Ended
May 18, 2025
USD ($)
$ / shares
shares
Dec. 31, 2025
USD ($)
shares
Dec. 31, 2024
USD ($)
shares
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Business Combination [Line Items]          
Shares of Discover common stock issued immediately prior to the acquisition (in shares) | shares   708,546,381 702,224,674    
Shares of Discover common stock outstanding immediately prior to the acquisition (in shares) | shares   625,102,271 381,230,343    
Fair value of liabilities assumed:          
Goodwill   $ 28,509 $ 15,059 $ 15,065 $ 14,777
Discover          
Business Combination [Line Items]          
Shares of Discover common stock issued immediately prior to the acquisition (in shares) | shares 1.0192        
Exchange ratio 1.0192        
Number of shares of Capital One treasury stock reissued in the acquisition before fractional shares adjustment (in shares) | shares 256,511,991        
Less: Number of fractional shares (in shares) | shares (14,778)        
Number of shares of Capital One treasury stock issued in the acquisition (in shares) | shares 256,497,213        
Price per share of Capital One common stock (in usd per share) | $ / shares $ 197.22        
Fair value of purchase consideration $ 51,793        
Fair value of assets acquired:          
Cash and cash equivalents and Restricted cash for securitization investors 16,467        
Securities available for sale 14,108        
Net loans held for investment (see Table 2.3) 108,609        
Premises and equipment 956        
Interest receivable 926        
Intangible assets (see Table 2.4) 17,670        
Other assets 1,448        
Assets of discontinued operations 8,398        
Fair value of liabilities assumed:          
Interest payable 347        
Non-interest-bearing deposits 1,710        
Interest-bearing deposits (see Table 2.5) 105,208        
Securitized debt obligations 5,827        
Senior and subordinated notes 6,917        
Other borrowings 538        
Deferred tax liability 3,572        
Other liabilities 6,094        
Fair value of net assets acquired 38,369        
Goodwill 13,424 13,400      
Business combination, provisional information, initial accounting incomplete, adjustment, intangibles   540      
Business combination, provision information, initial accounting incomplete, adjustment, property, plant and equipment   109      
Business combination, provisional information, initial accounting incomplete, adjustment, assets of discontinued operations   416      
Goodwill, measurement period adjustment   $ 182      
Business combination, recognized asset acquired, home loans, discontinued operations 8,400        
Discover | Securitization Investors          
Fair value of liabilities assumed:          
Restricted cash 1,000        
Discover | Common Stock          
Business Combination [Line Items]          
Fair value of purchase consideration 50,586        
Discover | Preferred Stock          
Business Combination [Line Items]          
Fair value of purchase consideration 1,068        
Discover | Award          
Business Combination [Line Items]          
Fair value of purchase consideration 136        
Discover | Lieu of Fractional Shares          
Business Combination [Line Items]          
Fair value of purchase consideration $ 3        
Discover | Discover          
Business Combination [Line Items]          
Shares of Discover common stock issued immediately prior to the acquisition (in shares) | shares 251,679,740        
Shares of Discover common stock outstanding immediately prior to the acquisition (in shares) | shares 251,679,740