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Business Combinations and Discontinued Operations - Additional Information (Details) - USD ($)
$ in Millions
 12 Months Ended
Nov. 24, 2025
May 18, 2025
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Jun. 30, 2025
Dec. 31, 2022
Business Combination [Line Items]              
Common stock, shares issued (in shares)     708,546,381 702,224,674      
Treasury stock, shares (in shares)     83,444,110 320,994,331      
Preferred stock, shares issued (in shares)     4,980,700 4,975,000      
Preferred stock, value, issued     $ 0 $ 0      
Goodwill     28,509 15,059 $ 15,065   $ 14,777
Proceeds from divestiture of business     8,800 0 0    
Gain on sale of discontinued operations     483 0 0    
Discover              
Business Combination [Line Items]              
Proceeds from divestiture of business $ 8,800            
Gain on sale of discontinued operations $ 483            
Credit Card              
Business Combination [Line Items]              
Goodwill         5,366   5,078
Consumer Banking              
Business Combination [Line Items]              
Goodwill         $ 4,645   $ 4,645
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     1,100 $ 234      
Business combination, acquisition related costs   124          
Business combination, allowance for credit losses PCD loan   8,800 8,800     $ 8,800  
Goodwill   13,424 13,400        
Business combination, pro-forma information, interest income from continuing operations     9,000        
Business combination, pro-forma information, non-interest income from continuing operations     1,800        
Business combination, pro forma information, pro forma income (loss) from continuing operations, after tax     $ (4,500)        
Discover | Credit Card              
Business Combination [Line Items]              
Goodwill   6,500          
Discover | Consumer Banking              
Business Combination [Line Items]              
Goodwill   $ 6,900          
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