v3.26.3
Accumulated Other Comprehensive Income/(Loss) - Rollforward (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Beginning balance     $ 362,438  
Net change $ (12,127) $ 1,365 (15,530) $ 6,578
Ending balance 372,368 360,212 372,368 360,212
Accumulated other comprehensive income/(loss)        
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Beginning balance (7,693) (7,243) (4,290) (12,456)
Net change (12,127) 1,365 (15,530) 6,578
Ending balance (19,820) (5,878) (19,820) (5,878)
Unrealized gains/(losses) on investment securities        
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Beginning balance (2,342) (3,065) (261) (3,830)
Net change (7,893) 1,509 (9,974) 2,274
Ending balance (10,235) (1,556) (10,235) (1,556)
After-tax unamortized unrealized losses related to AFS securities transferred to HTM     (382) (189)
Translation adjustments, net of hedges        
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Beginning balance (923) (717) (735) (2,074)
Net change (29) (12) (217) 1,345
Ending balance (952) (729) (952) (729)
Fair value hedges        
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Beginning balance (125) (201) (157) (221)
Net change 24 37 56 57
Ending balance (101) (164) (101) (164)
Cash flow hedges        
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Beginning balance (3,275) (1,611) (1,426) (4,814)
Net change (4,410) 314 (6,259) 3,517
Ending balance (7,685) (1,297) (7,685) (1,297)
Defined benefit pension and OPEB plans        
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Beginning balance (521) (1,185) (562) (1,141)
Net change 179 4 220 (40)
Ending balance (342) (1,181) (342) (1,181)
DVA on fair value option elected liabilities        
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Beginning balance (507) (464) (1,149) (376)
Net change 2 (487) 644 (575)
Ending balance $ (505) $ (951) $ (505) $ (951)