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Business Combinations and Discontinued Operations - Additional Information (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended 21 Months Ended
May 18, 2025
Sep. 30, 2025
Sep. 30, 2025
Sep. 30, 2025
Jun. 30, 2025
Dec. 31, 2024
Business Combination [Line Items]            
Common stock, shares issued (in shares)   707,690,438 707,690,438 707,690,438   702,224,674
Treasury stock, shares (in shares)   71,956,833 71,956,833 71,956,833   320,994,331
Preferred stock, shares issued (in shares)   4,980,700 4,980,700 4,980,700   4,975,000
Preferred stock, value, issued   $ 0 $ 0 $ 0   $ 0
Goodwill   28,863 28,863 28,863   $ 15,059
Series D Preferred Stock            
Business Combination [Line Items]            
Per annum dividend rate 6.125%          
Series P            
Business Combination [Line Items]            
Per annum dividend rate 6.125%          
Discover            
Business Combination [Line Items]            
Common stock, shares issued (in shares) 1.0192          
Treasury stock, shares (in shares) 256,497,213          
Treasury stock, value $ 50,600          
Preferred stock, shares issued (in shares) 10,700          
Preferred stock, value, issued $ 1,100          
Business combination, stock-based compensation award 136          
Fair value of purchase consideration 51,793          
Launch and integration expenses   348 757 991    
Business combination, acquisition related costs 124          
Business combination, provisional information, initial accounting incomplete, adjustment, intangibles   600        
Business combination, provisional information, initial accounting incomplete, adjustment, property, plant, and equipment   109        
Business combination, provisional information, initial accounting incomplete, adjustment, deferred income taxes   148        
Goodwill, measurement period adjustment   536        
Business combination, allowance for credit losses PCD loan 8,800 $ 8,800 8,800 $ 8,800 $ 8,800  
Business combination, pro-forma information, interest income from continuing operations     5,300      
Business combination, pro-forma information, non-interest income from continuing operations     1,100      
Business combination, pro forma information, pro forma income (loss) from continuing operations, after tax     $ (5,300)      
Goodwill 13,778          
Discover | Credit Card            
Business Combination [Line Items]            
Goodwill 6,800          
Discover | Consumer Banking            
Business Combination [Line Items]            
Goodwill $ 7,000          
Discover | Series P            
Business Combination [Line Items]            
Per annum dividend rate 6.125%          
Preferred stock, shares issued (in shares) 5,000          
Discover | Discover            
Business Combination [Line Items]            
Common stock, shares issued (in shares) 251,679,740