v3.26.1
Goodwill - Schedule of Goodwill (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2026
Dec. 31, 2025
Dec. 31, 2024
Goodwill      
Goodwill     $ 5,883
Accumulated impairment losses     (965)
Goodwill [Roll Forward]      
Net carrying value, beginning of period $ 4,947 $ 4,918  
Acquisition activity 5,019 29  
Reallocation of goodwill   0  
Net carrying value, end of period 9,966 4,947  
Operating Segments | Commercial Banking      
Goodwill      
Goodwill     3,074
Accumulated impairment losses     (750)
Goodwill [Roll Forward]      
Net carrying value, beginning of period 2,280 2,324  
Acquisition activity 0 29  
Reallocation of goodwill   (73)  
Net carrying value, end of period 2,280 2,280  
Operating Segments | Consumer and Small Business Banking      
Goodwill      
Goodwill     2,584
Accumulated impairment losses     (215)
Goodwill [Roll Forward]      
Net carrying value, beginning of period 2,442 2,369  
Acquisition activity 0 0  
Reallocation of goodwill   73  
Net carrying value, end of period 2,442 2,442  
Operating Segments | Wealth and Asset Management      
Goodwill      
Goodwill     225
Accumulated impairment losses     0
Goodwill [Roll Forward]      
Net carrying value, beginning of period 225 225  
Acquisition activity 0 0  
Reallocation of goodwill   0  
Net carrying value, end of period 225 225  
General Corporate and Other      
Goodwill      
Goodwill     0
Accumulated impairment losses     $ 0
Goodwill [Roll Forward]      
Net carrying value, beginning of period 0 0  
Acquisition activity 5,019 0  
Reallocation of goodwill   0  
Net carrying value, end of period $ 5,019 $ 0