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Goodwill and Other Intangible Assets - Goodwill Business Segments (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Goodwill [Roll Forward]      
Goodwill, beginning balance $ 15,059 $ 15,065 $ 14,777
Acquisitions 13,424   273
Other adjustments 26 (6) 15
Goodwill, ending balance 28,509 15,059 15,065
Credit Card      
Goodwill [Roll Forward]      
Goodwill, beginning balance   5,366 5,078
Acquisitions     273
Other adjustments   (6) 15
Goodwill, ending balance     5,366
Credit Card | Operating segments      
Goodwill [Roll Forward]      
Goodwill, beginning balance 5,360    
Acquisitions 6,529    
Other adjustments 26    
Goodwill, ending balance 11,915 5,360  
Consumer Banking      
Goodwill [Roll Forward]      
Goodwill, beginning balance   4,645 4,645
Acquisitions     0
Other adjustments   0 0
Goodwill, ending balance     4,645
Consumer Banking | Operating segments      
Goodwill [Roll Forward]      
Goodwill, beginning balance 4,645    
Acquisitions 6,895    
Other adjustments 0    
Goodwill, ending balance 11,540 4,645  
Commercial Banking      
Goodwill [Roll Forward]      
Goodwill, beginning balance   5,054 5,054
Acquisitions     0
Other adjustments   0 0
Goodwill, ending balance     $ 5,054
Commercial Banking | Operating segments      
Goodwill [Roll Forward]      
Goodwill, beginning balance 5,054    
Acquisitions 0    
Other adjustments 0    
Goodwill, ending balance $ 5,054 $ 5,054