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Fair Values - Activity of Level 3 Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - Recurring - Level 3 - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Liabilities at Fair Value        
Portion of Unrealized losses (gains) recorded in OCI—Change in net DVA $ 0 $ (1) $ 0 $ 0
Deposits        
Liabilities at Fair Value        
Beginning balance 30 34 1 33
Settlements 0 0 (1) 0
Net transfers (29) (33) 1 (32)
Ending balance 1 1 1 1
Unrealized losses (gains) 0 0 0 0
Nonderivative trading liabilities        
Liabilities at Fair Value        
Beginning balance 114 42 110 60
Realized and unrealized losses (gains) 16 6 (5) (17)
Purchases (104) (44) 8 (50)
Settlements 0 0 0 (1)
Net transfers (9) 43 (55) 2
Sales 118 25 77 78
Ending balance 135 72 135 72
Unrealized losses (gains) 46 9 (4) (6)
Securities sold under agreements to repurchase        
Liabilities at Fair Value        
Beginning balance 446 449 444 449
Realized and unrealized losses (gains) 6 4 8 4
Ending balance 452 453 452 453
Unrealized losses (gains) 5 3 7 4
Other secured financings        
Liabilities at Fair Value        
Beginning balance 144 91 76 92
Realized and unrealized losses (gains) (11) 1 (1) (4)
Issuances 4 57 257 94
Settlements 0 (16) (152) (58)
Net transfers (19) 14 169 23
Sales 0 0 (231) 0
Ending balance 118 147 118 147
Unrealized losses (gains) (11) 1 (1) (4)
Borrowings        
Liabilities at Fair Value        
Beginning balance 2,678 1,976 947 1,878
Realized and unrealized losses (gains) 115 86 214 90
Issuances 155 95 576 412
Settlements (178) (105) (181) (212)
Net transfers (1,419) (581) (205) (697)
Ending balance 1,351 1,471 1,351 1,471
Unrealized losses (gains) 124 109 210 115
Transfers into level 3 (1,400)   (200)  
Net derivatives: Interest rate        
Assets at Fair value        
Beginning balance (457) 262 (53) (73)
Realized and unrealized gains (losses) 35 (120) (370) (103)
Purchases 64 20 85 27
Issuances (29) (6) (121) (14)
Settlements (21) (77) 44 (18)
Net transfers 35 (79) 42 181
Ending balance (373) 0 (373) 0
Unrealized gains (losses) 50 (114) (326) (65)
Net derivatives: Credit        
Assets at Fair value        
Beginning balance 97 124 97 96
Realized and unrealized gains (losses) (31) 108 (115) (42)
Settlements 8 (116) 117 39
Net transfers 19 (2) (6) 21
Ending balance 93 114 93 114
Unrealized gains (losses) (42) 108 (104) (21)
Net derivatives: Foreign exchange        
Assets at Fair value        
Beginning balance (433) (118) 589 (365)
Realized and unrealized gains (losses) 66 51 68 57
Purchases 2 0 13 0
Issuances 0 0 (24) 0
Settlements 133 117 (870) 264
Net transfers (23) 45 (31) 139
Ending balance (255) 95 (255) 95
Unrealized gains (losses) 60 51 68 61
Net derivatives: Equity        
Assets at Fair value        
Beginning balance (1,077) (1,055) (1,148) (1,102)
Realized and unrealized gains (losses) (148) (123) 110 125
Purchases 53 54 206 186
Issuances (197) (161) (753) (473)
Settlements (131) 265 154 337
Net transfers 479 252 410 159
Ending balance (1,021) (768) (1,021) (768)
Unrealized gains (losses) (104) (155) (24) 11
Net derivatives: Commodity and other        
Assets at Fair value        
Beginning balance 887 1,203 1,308 1,290
Realized and unrealized gains (losses) 208 223 370 789
Purchases 81 70 206 126
Issuances (176) (23) (315) (37)
Settlements (119) (398) (296) (909)
Net transfers 144 (51) (248) (235)
Ending balance 1,025 1,024 1,025 1,024
Unrealized gains (losses) 332 (58) 457 (48)
Other sovereign government obligations        
Assets at Fair value        
Beginning balance 26 74 17 94
Realized and unrealized gains (losses) 0 3 0 1
Purchases 5 14 5 48
Sales (18) (27) (5) (74)
Net transfers 51 45 47 40
Ending balance 64 109 64 109
Unrealized gains (losses) 0 (2) 0 (2)
State and municipal securities        
Assets at Fair value        
Beginning balance 10 0 0 34
Sales 0 0 0 (29)
Net transfers (10) 13 0 8
Ending balance 0 13 0 13
Unrealized gains (losses) 0 0 0 0
MABS        
Assets at Fair value        
Beginning balance 515 423 281 489
Realized and unrealized gains (losses) 12 10 11 27
Purchases 26 43 101 140
Sales (46) (58) (68) (243)
Net transfers (1) 23 181 28
Ending balance 506 441 506 441
Unrealized gains (losses) 11 15 (2) 9
Loans and lending commitments        
Assets at Fair value        
Beginning balance 1,283 2,176 1,059 2,066
Realized and unrealized gains (losses) 20 29 20 19
Purchases and originations 273 130 557 681
Sales (277) (648) (484) (917)
Settlements 0 (4) (2) (174)
Net transfers (33) (99) 116 (91)
Ending balance 1,266 1,584 1,266 1,584
Unrealized gains (losses) 13 (1) 18 (2)
Corporate and other debt        
Assets at Fair value        
Beginning balance 1,759 1,925 1,258 1,983
Realized and unrealized gains (losses) 73 9 (84) 44
Purchases and originations 225 423 643 834
Sales (285) (496) (308) (980)
Settlements 0 (73) 0 (85)
Net transfers (273) (62) (10) (70)
Ending balance 1,499 1,726 1,499 1,726
Unrealized gains (losses) 84 6 129 101
Corporate equities        
Assets at Fair value        
Beginning balance 205 217 154 199
Realized and unrealized gains (losses) 17 (24) (16) (93)
Purchases 63 26 153 65
Sales (62) (29) (111) (58)
Net transfers 44 4 87 81
Ending balance 267 194 267 194
Unrealized gains (losses) 39 (11) 0 (17)
Investments        
Assets at Fair value        
Beginning balance 780 843 754 949
Realized and unrealized gains (losses) 69 53 345 63
Purchases 56 18 76 42
Sales (44) (101) (235) (241)
Net transfers 600 (3) 521 (3)
Ending balance 1,461 810 1,461 810
Unrealized gains (losses) 94 24 342 6
Investment securities—AFS        
Assets at Fair value        
Beginning balance 11 0 0 0
Net transfers (11) 0 0 0
Ending balance 0 0 0 0
Unrealized gains (losses) $ 0 $ 0 $ 0 $ 0