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Business Combinations and Discontinued Operations - Business Combination (Details)
$ / shares in Units, $ in Millions
May 18, 2025
USD ($)
$ / shares
shares
Jun. 30, 2025
USD ($)
shares
Dec. 31, 2024
USD ($)
shares
Business Combination [Line Items]      
Common stock, shares issued (in shares) | shares   706,729,115 702,224,674
Common stock, shares outstanding (in shares) | shares   639,517,306 381,230,343
Preliminary fair value of liabilities assumed:      
Goodwill   $ 28,335 $ 15,059
Discover      
Business Combination [Line Items]      
Common stock, shares issued (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    
Preliminary 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 1,065    
Interest receivable 926    
Intangible assets (see Table 2.4) 18,210    
Other assets 1,254    
Assets of discontinued operations 7,982    
Preliminary fair value of liabilities assumed:      
Interest payable 347    
Non-interest-bearing deposits 1,516    
Interest-bearing deposits (see Table 2.5) 105,201    
Securitized debt obligations 5,827    
Senior and subordinated notes 6,917    
Other borrowings 538    
Deferred tax liability 3,603    
Other liabilities 6,121    
Preliminary fair value of net assets acquired 38,551    
Goodwill 13,242    
Business combination, recognized asset acquired, home loans, discontinued operations 7,900    
Discover | Securitization Investors      
Preliminary 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]      
Common stock, shares issued (in shares) | shares 251,679,740    
Common stock, shares outstanding (in shares) | shares 251,679,740