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FAIR VALUE MEASUREMENT - Level 3 Roll Forward (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Fair value, liabilities measured on recurring basis, level 3 fair-value category reconciliation    
Gains (losses), location   Realized gains on sales of investments, net
Trading account assets and liabilities    
Fair value, Derivative assets (liabilities) measured on recurring basis, level 3 fair-value category reconciliation    
Balance at beginning of period, asset (liability), net $ (578) $ (112)
Net realized/unrealized gains (losses) included in principal transactions (1,744) 3,070
Net realized/unrealized gains (losses) included in locations Other 0 0
Transfers into Level 3 185 (774)
Transfers out of Level 3 974 (726)
Purchases (1,060) 201
Issuances 6 27
Sales (197) (961)
Settlements 196 (1,303)
Balance at end of period, asset (liability), net (2,218) (578)
Unrealized gains (losses) still held (2,890) 603
Trading account assets and liabilities | Interest rate contracts    
Fair value, Derivative assets (liabilities) measured on recurring basis, level 3 fair-value category reconciliation    
Balance at beginning of period, asset (liability), net 355 1,726
Net realized/unrealized gains (losses) included in principal transactions (1,588) 176
Net realized/unrealized gains (losses) included in locations Other 0 0
Transfers into Level 3 (172) 33
Transfers out of Level 3 (314) (792)
Purchases 21 (163)
Issuances 6 7
Sales 58 79
Settlements 549 (711)
Balance at end of period, asset (liability), net (1,085) 355
Unrealized gains (losses) still held (1,481) (588)
Trading account assets and liabilities | Foreign exchange contracts    
Fair value, Derivative assets (liabilities) measured on recurring basis, level 3 fair-value category reconciliation    
Balance at beginning of period, asset (liability), net 50 (89)
Net realized/unrealized gains (losses) included in principal transactions 412 734
Net realized/unrealized gains (losses) included in locations Other 0 0
Transfers into Level 3 91 (422)
Transfers out of Level 3 46 (22)
Purchases 135 124
Issuances 0 20
Sales (107) (459)
Settlements (332) 164
Balance at end of period, asset (liability), net 295 50
Unrealized gains (losses) still held (144) (81)
Trading account assets and liabilities | Equity contracts    
Fair value, Derivative assets (liabilities) measured on recurring basis, level 3 fair-value category reconciliation    
Balance at beginning of period, asset (liability), net (1,104) (2,140)
Net realized/unrealized gains (losses) included in principal transactions (672) 1,604
Net realized/unrealized gains (losses) included in locations Other 0 0
Transfers into Level 3 32 (572)
Transfers out of Level 3 858 673
Purchases (819) 176
Issuances 0 0
Sales (114) (370)
Settlements 185 (475)
Balance at end of period, asset (liability), net (1,634) (1,104)
Unrealized gains (losses) still held (927) 1,057
Trading account assets and liabilities | Commodity contracts    
Fair value, Derivative assets (liabilities) measured on recurring basis, level 3 fair-value category reconciliation    
Balance at beginning of period, asset (liability), net 278 422
Net realized/unrealized gains (losses) included in principal transactions 324 822
Net realized/unrealized gains (losses) included in locations Other 0 0
Transfers into Level 3 235 194
Transfers out of Level 3 77 (716)
Purchases (389) 100
Issuances 0 0
Sales (34) (211)
Settlements (212) (333)
Balance at end of period, asset (liability), net 279 278
Unrealized gains (losses) still held (284) 413
Trading account assets and liabilities | Credit derivatives    
Fair value, Derivative assets (liabilities) measured on recurring basis, level 3 fair-value category reconciliation    
Balance at beginning of period, asset (liability), net (157) (31)
Net realized/unrealized gains (losses) included in principal transactions (220) (266)
Net realized/unrealized gains (losses) included in locations Other 0 0
Transfers into Level 3 (1) (7)
Transfers out of Level 3 307 131
Purchases (8) (36)
Issuances 0 0
Sales 0 0
Settlements 6 52
Balance at end of period, asset (liability), net (73) (157)
Unrealized gains (losses) still held (54) (198)
Interest-bearing deposits    
Fair value, liabilities measured on recurring basis, level 3 fair-value category reconciliation    
Balance at beginning of period 15 183
Net realized/unrealized gains (losses) included in principal transactions (7) 0
Net realized/unrealized gains (losses) included in locations Other (4) 6
Transfers into Level 3 50 8
Transfers out of Level 3 (118) (122)
Purchases 0 0
Issuances 84 20
Sales 0 0
Settlements (13) (68)
Balance at end of period 29 15
Unrealized gains (losses) still held 9 0
Securities loaned and sold under agreements to repurchase    
Fair value, liabilities measured on recurring basis, level 3 fair-value category reconciliation    
Balance at beginning of period 1,031 643
Net realized/unrealized gains (losses) included in principal transactions (5) 86
Net realized/unrealized gains (losses) included in locations Other 0 0
Transfers into Level 3 0 3
Transfers out of Level 3 (24) (3)
Purchases 1,335 453
Issuances 61 196
Sales 0 0
Settlements (2,018) (175)
Balance at end of period 390 1,031
Unrealized gains (losses) still held 0 7
Trading account liabilities | Securities sold, not yet purchased    
Fair value, liabilities measured on recurring basis, level 3 fair-value category reconciliation    
Balance at beginning of period 50 65
Net realized/unrealized gains (losses) included in principal transactions (30) 2
Net realized/unrealized gains (losses) included in locations Other 0 0
Transfers into Level 3 22 55
Transfers out of Level 3 (49) (36)
Purchases 123 135
Issuances 0 0
Sales 0 0
Settlements (141) (167)
Balance at end of period 35 50
Unrealized gains (losses) still held (13) (65)
Trading account liabilities | Other trading liabilities    
Fair value, liabilities measured on recurring basis, level 3 fair-value category reconciliation    
Balance at beginning of period 3 0
Net realized/unrealized gains (losses) included in principal transactions 1 (3)
Net realized/unrealized gains (losses) included in locations Other 0 0
Transfers into Level 3 4 0
Transfers out of Level 3 (2) 0
Purchases 3 0
Issuances 0 0
Sales 0 0
Settlements (7) 0
Balance at end of period 0 3
Unrealized gains (losses) still held 0 0
Short-term borrowings    
Fair value, liabilities measured on recurring basis, level 3 fair-value category reconciliation    
Balance at beginning of period 38 105
Net realized/unrealized gains (losses) included in principal transactions 44 109
Net realized/unrealized gains (losses) included in locations Other 0 0
Transfers into Level 3 62 46
Transfers out of Level 3 (31) (69)
Purchases 2 0
Issuances 488 96
Sales 0 0
Settlements (34) (31)
Balance at end of period 481 38
Unrealized gains (losses) still held (27) (14)
Long-term debt    
Fair value, Derivative assets (liabilities) measured on recurring basis, level 3 fair-value category reconciliation    
Transfers into Level 3 4,900 9,900
Transfers out of Level 3 (10,200) (7,600)
Fair value, liabilities measured on recurring basis, level 3 fair-value category reconciliation    
Balance at beginning of period 36,117 25,509
Net realized/unrealized gains (losses) included in principal transactions (1,039) 9,796
Net realized/unrealized gains (losses) included in locations Other 0 0
Transfers into Level 3 4,913 9,873
Transfers out of Level 3 (10,215) (7,612)
Purchases 0 0
Issuances 9,811 18,847
Sales 0 0
Settlements (3,285) (704)
Balance at end of period 38,380 36,117
Unrealized gains (losses) still held (2,644) 7,805
Other financial liabilities measured on a recurring basis    
Fair value, liabilities measured on recurring basis, level 3 fair-value category reconciliation    
Balance at beginning of period 2 1
Net realized/unrealized gains (losses) included in principal transactions 0 0
Net realized/unrealized gains (losses) included in locations Other 6 (6)
Transfers into Level 3 0 5
Transfers out of Level 3 (1) (5)
Purchases 6 0
Issuances 49 2
Sales (20) 0
Settlements (24) (7)
Balance at end of period 6 2
Unrealized gains (losses) still held 0 0
Securities borrowed and purchased under agreements to resell    
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation    
Balance at beginning of period 149 231
Net realized/unrealized gains (losses) included in principal transactions 8 12
Net realized/unrealized gains (losses) included in Other 0 0
Transfers into Level 3 0 3
Transfers out of Level 3 (2) 0
Purchases 308 252
Issuances 0 0
Sales 0 0
Settlements (324) (349)
Balance at end of period 139 149
Unrealized gains (losses) still held 13 18
Trading non-derivative assets    
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation    
Balance at beginning of period 2,940 2,520
Net realized/unrealized gains (losses) included in principal transactions 525 219
Net realized/unrealized gains (losses) included in Other 0 0
Transfers into Level 3 1,838 2,220
Transfers out of Level 3 (2,114) (2,391)
Purchases 4,134 4,290
Issuances 2 27
Sales (4,200) (3,932)
Settlements (6) (13)
Balance at end of period 3,119 2,940
Unrealized gains (losses) still held 74 (422)
Trading non-derivative assets | U.S. government-sponsored agency guaranteed    
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation    
Balance at beginning of period 600 496
Net realized/unrealized gains (losses) included in principal transactions 7 (81)
Net realized/unrealized gains (losses) included in Other 0 0
Transfers into Level 3 396 244
Transfers out of Level 3 (543) (475)
Purchases 616 969
Issuances 0 0
Sales (495) (553)
Settlements 0 0
Balance at end of period 581 600
Unrealized gains (losses) still held 14 (59)
Trading non-derivative assets | Residential    
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation    
Balance at beginning of period 166 104
Net realized/unrealized gains (losses) included in principal transactions 2 (5)
Net realized/unrealized gains (losses) included in Other 0 0
Transfers into Level 3 103 112
Transfers out of Level 3 (110) (87)
Purchases 197 187
Issuances 0 0
Sales (242) (145)
Settlements 0 0
Balance at end of period 116 166
Unrealized gains (losses) still held (20) (1)
Trading non-derivative assets | Commercial    
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation    
Balance at beginning of period 145 81
Net realized/unrealized gains (losses) included in principal transactions (25) (13)
Net realized/unrealized gains (losses) included in Other 0 0
Transfers into Level 3 202 167
Transfers out of Level 3 (88) (78)
Purchases 118 37
Issuances 0 0
Sales (150) (49)
Settlements 0 0
Balance at end of period 202 145
Unrealized gains (losses) still held (15) (3)
Trading non-derivative assets | Mortgage-backed securities    
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation    
Balance at beginning of period 911 681
Net realized/unrealized gains (losses) included in principal transactions (16) (99)
Net realized/unrealized gains (losses) included in Other 0 0
Transfers into Level 3 701 523
Transfers out of Level 3 (741) (640)
Purchases 931 1,193
Issuances 0 0
Sales (887) (747)
Settlements 0 0
Balance at end of period 899 911
Unrealized gains (losses) still held (21) (63)
Trading non-derivative assets | U.S. Treasury and federal agency securities    
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation    
Balance at beginning of period 1 4
Net realized/unrealized gains (losses) included in principal transactions (4) (4)
Net realized/unrealized gains (losses) included in Other 0 0
Transfers into Level 3 10 2
Transfers out of Level 3 0 (1)
Purchases 0 1
Issuances 0 0
Sales 0 0
Settlements 0 (1)
Balance at end of period 7 1
Unrealized gains (losses) still held 0 (1)
Trading non-derivative assets | State and municipal    
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation    
Balance at beginning of period 7 37
Net realized/unrealized gains (losses) included in principal transactions (3) 9
Net realized/unrealized gains (losses) included in Other 0 0
Transfers into Level 3 21 77
Transfers out of Level 3 (2) (35)
Purchases 0 16
Issuances 0 0
Sales (20) (97)
Settlements 0 0
Balance at end of period 3 7
Unrealized gains (losses) still held 0 0
Trading non-derivative assets | Foreign government    
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation    
Balance at beginning of period 119 23
Net realized/unrealized gains (losses) included in principal transactions (18) (41)
Net realized/unrealized gains (losses) included in Other 0 0
Transfers into Level 3 8 308
Transfers out of Level 3 (66) (326)
Purchases 174 248
Issuances 0 0
Sales (163) (93)
Settlements 0 0
Balance at end of period 54 119
Unrealized gains (losses) still held (1) (22)
Trading non-derivative assets | Corporate    
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation    
Balance at beginning of period 394 412
Net realized/unrealized gains (losses) included in principal transactions 289 101
Net realized/unrealized gains (losses) included in Other 0 0
Transfers into Level 3 285 499
Transfers out of Level 3 (691) (451)
Purchases 1,163 1,068
Issuances 0 0
Sales (940) (1,235)
Settlements 0 0
Balance at end of period 500 394
Unrealized gains (losses) still held (6) (136)
Trading non-derivative assets | Marketable equity securities    
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation    
Balance at beginning of period 192 174
Net realized/unrealized gains (losses) included in principal transactions 68 45
Net realized/unrealized gains (losses) included in Other 0 0
Transfers into Level 3 99 161
Transfers out of Level 3 (39) (105)
Purchases 146 155
Issuances 0 0
Sales (174) (238)
Settlements 0 0
Balance at end of period 292 192
Unrealized gains (losses) still held 62 (42)
Trading non-derivative assets | Asset-backed securities    
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation    
Balance at beginning of period 668 613
Net realized/unrealized gains (losses) included in principal transactions 25 (41)
Net realized/unrealized gains (losses) included in Other 0 0
Transfers into Level 3 105 243
Transfers out of Level 3 (138) (239)
Purchases 801 835
Issuances 0 0
Sales (930) (743)
Settlements 0 0
Balance at end of period 531 668
Unrealized gains (losses) still held 12 (36)
Trading non-derivative assets | Other trading assets    
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation    
Balance at beginning of period 648 576
Net realized/unrealized gains (losses) included in principal transactions 184 249
Net realized/unrealized gains (losses) included in Other 0 0
Transfers into Level 3 609 407
Transfers out of Level 3 (437) (594)
Purchases 919 774
Issuances 2 27
Sales (1,086) (779)
Settlements (6) (12)
Balance at end of period 833 648
Unrealized gains (losses) still held 28 (122)
Investments    
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation    
Balance at beginning of period 2,049 2,227
Net realized/unrealized gains (losses) included in principal transactions 0 0
Net realized/unrealized gains (losses) included in Other 64 (150)
Transfers into Level 3 116 588
Transfers out of Level 3 (560) (509)
Purchases 1,337 980
Issuances 0 0
Sales (1,207) (1,087)
Settlements 0 0
Balance at end of period 1,799 2,049
Unrealized gains (losses) still held 109 (104)
Investments | U.S. government-sponsored agency guaranteed    
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation    
Balance at beginning of period 30 51
Net realized/unrealized gains (losses) included in principal transactions 0 0
Net realized/unrealized gains (losses) included in Other 4 (7)
Transfers into Level 3 0 1
Transfers out of Level 3 (3) (10)
Purchases 47 7
Issuances 0 0
Sales (3) (12)
Settlements 0 0
Balance at end of period 75 30
Unrealized gains (losses) still held 2 (24)
Investments | Residential    
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation    
Balance at beginning of period 41 94
Net realized/unrealized gains (losses) included in principal transactions 0 0
Net realized/unrealized gains (losses) included in Other 1 (5)
Transfers into Level 3 0 0
Transfers out of Level 3 0 (42)
Purchases 90 3
Issuances 0 0
Sales (16) (9)
Settlements 0 0
Balance at end of period 116 41
Unrealized gains (losses) still held 1 (5)
Investments | Commercial    
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation    
Balance at beginning of period 0 0
Net realized/unrealized gains (losses) included in principal transactions   0
Net realized/unrealized gains (losses) included in Other   0
Transfers into Level 3   0
Transfers out of Level 3   0
Purchases   0
Issuances   0
Sales   0
Settlements   0
Balance at end of period   0
Unrealized gains (losses) still held   0
Investments | Mortgage-backed securities    
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation    
Balance at beginning of period 71 145
Net realized/unrealized gains (losses) included in principal transactions 0 0
Net realized/unrealized gains (losses) included in Other 5 (12)
Transfers into Level 3 0 1
Transfers out of Level 3 (3) (52)
Purchases 137 10
Issuances 0 0
Sales (19) (21)
Settlements 0 0
Balance at end of period 191 71
Unrealized gains (losses) still held 3 (29)
Investments | U.S. Treasury and federal agency securities    
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation    
Balance at beginning of period 0 1
Net realized/unrealized gains (losses) included in principal transactions 0 0
Net realized/unrealized gains (losses) included in Other (1) (1)
Transfers into Level 3 0 0
Transfers out of Level 3 (20) 0
Purchases 51 0
Issuances 0 0
Sales (30) 0
Settlements 0 0
Balance at end of period 0 0
Unrealized gains (losses) still held 0 0
Investments | State and municipal    
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation    
Balance at beginning of period 586 772
Net realized/unrealized gains (losses) included in principal transactions 0 0
Net realized/unrealized gains (losses) included in Other 27 (65)
Transfers into Level 3 2 82
Transfers out of Level 3 (86) (164)
Purchases 64 2
Issuances 0 0
Sales (51) (41)
Settlements 0 0
Balance at end of period 542 586
Unrealized gains (losses) still held 31 (49)
Investments | Foreign government    
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation    
Balance at beginning of period 608 786
Net realized/unrealized gains (losses) included in principal transactions 0 0
Net realized/unrealized gains (losses) included in Other (13) (72)
Transfers into Level 3 27 256
Transfers out of Level 3 (327) (276)
Purchases 850 706
Issuances 0 0
Sales (951) (792)
Settlements 0 0
Balance at end of period 194 608
Unrealized gains (losses) still held (3) (23)
Investments | Corporate    
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation    
Balance at beginning of period 343 188
Net realized/unrealized gains (losses) included in principal transactions 0 0
Net realized/unrealized gains (losses) included in Other (2) (4)
Transfers into Level 3 49 197
Transfers out of Level 3 (61) (4)
Purchases 131 24
Issuances 0 0
Sales (98) (58)
Settlements 0 0
Balance at end of period 362 343
Unrealized gains (losses) still held (4) (2)
Investments | Marketable equity securities    
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation    
Balance at beginning of period 10 16
Net realized/unrealized gains (losses) included in principal transactions 0 0
Net realized/unrealized gains (losses) included in Other 17 (7)
Transfers into Level 3 0 0
Transfers out of Level 3 0 0
Purchases 0 1
Issuances 0 0
Sales 0 0
Settlements 0 0
Balance at end of period 27 10
Unrealized gains (losses) still held 0 0
Investments | Asset-backed securities    
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation    
Balance at beginning of period 1 3
Net realized/unrealized gains (losses) included in principal transactions 0 0
Net realized/unrealized gains (losses) included in Other (1) 22
Transfers into Level 3 30 41
Transfers out of Level 3 0 (1)
Purchases 0 0
Issuances 0 0
Sales (30) (64)
Settlements 0 0
Balance at end of period 0 1
Unrealized gains (losses) still held 0 (5)
Investments | Other debt securities    
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation    
Balance at beginning of period 0 0
Net realized/unrealized gains (losses) included in principal transactions 0 0
Net realized/unrealized gains (losses) included in Other 1 0
Transfers into Level 3 0 0
Transfers out of Level 3 (63) 0
Purchases 62 82
Issuances 0 0
Sales 0 (82)
Settlements 0 0
Balance at end of period 0 0
Unrealized gains (losses) still held 0 0
Investments | Non-marketable equity securities    
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation    
Balance at beginning of period 430 316
Net realized/unrealized gains (losses) included in principal transactions 0 0
Net realized/unrealized gains (losses) included in Other 31 (11)
Transfers into Level 3 8 11
Transfers out of Level 3 0 (12)
Purchases 42 155
Issuances 0 0
Sales (28) (29)
Settlements 0 0
Balance at end of period 483 430
Unrealized gains (losses) still held 82 4
Loans    
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation    
Balance at beginning of period 1,361 711
Net realized/unrealized gains (losses) included in principal transactions 0 0
Net realized/unrealized gains (losses) included in Other (236) 15
Transfers into Level 3 32 426
Transfers out of Level 3 (309) (208)
Purchases 0 0
Issuances 241 569
Sales 0 0
Settlements (662) (152)
Balance at end of period 427 1,361
Unrealized gains (losses) still held (16) 145
Mortgage servicing rights    
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation    
Balance at beginning of period 665 404
Net realized/unrealized gains (losses) included in principal transactions 0 0
Net realized/unrealized gains (losses) included in Other 28 201
Transfers into Level 3 0 0
Transfers out of Level 3 0 0
Purchases 0 0
Issuances 66 120
Sales 0 0
Settlements (68) (60)
Balance at end of period 691 665
Unrealized gains (losses) still held 20 199
Other financial assets measured at fair value on a recurring basis    
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation    
Balance at beginning of period 57 73
Net realized/unrealized gains (losses) included in principal transactions 0 0
Net realized/unrealized gains (losses) included in Other (24) (12)
Transfers into Level 3 0 29
Transfers out of Level 3 (2) (26)
Purchases 50 46
Issuances 22 39
Sales (32) (26)
Settlements (41) (66)
Balance at end of period 30 57
Unrealized gains (losses) still held $ 0 $ 0