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FAIR VALUE MEASUREMENT - Level 3 Roll Forward (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Equity contracts    
Fair value, Derivative assets (liabilities) measured on recurring basis, level 3 fair-value category reconciliation    
Transfers out of Level 3 $ (1,900)  
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 (1,207) $ (1,715)
Net realized/unrealized gains (losses) included in principal transactions 918 120
Net realized/unrealized gains (losses) included in locations Other 0 0
Transfers into Level 3 (978) 1,336
Transfers out of Level 3 2,175 0
Purchases 773 251
Issuances (84) 134
Sales (928) (1,036)
Settlements (781) (297)
Balance at end of period, asset (liability), net (112) (1,207)
Unrealized gains (losses) still held (587) (3,306)
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 1,614 1
Net realized/unrealized gains (losses) included in principal transactions (376) 429
Net realized/unrealized gains (losses) included in locations Other 0 0
Transfers into Level 3 102 1,644
Transfers out of Level 3 562 16
Purchases 27 41
Issuances (84) 134
Sales 0 (34)
Settlements (119) (617)
Balance at end of period, asset (liability), net 1,726 1,614
Unrealized gains (losses) still held 4 161
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 52 (5)
Net realized/unrealized gains (losses) included in principal transactions (8) 105
Net realized/unrealized gains (losses) included in locations Other 0 0
Transfers into Level 3 (57) (61)
Transfers out of Level 3 104 48
Purchases 220 74
Issuances 0 0
Sales (326) (55)
Settlements (74) (54)
Balance at end of period, asset (liability), net (89) 52
Unrealized gains (losses) still held 7 130
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 (3,213) (1,596)
Net realized/unrealized gains (losses) included in principal transactions 964 (536)
Net realized/unrealized gains (losses) included in locations Other 0 0
Transfers into Level 3 (1,101) (519)
Transfers out of Level 3 1,923 378
Purchases 364 35
Issuances 0 0
Sales (364) (886)
Settlements (713) (89)
Balance at end of period, asset (liability), net (2,140) (3,213)
Unrealized gains (losses) still held (729) (3,868)
Fair value, liabilities measured on recurring basis, level 3 fair-value category reconciliation    
Transfers into Level 3 1,100  
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 292 (59)
Net realized/unrealized gains (losses) included in principal transactions 474 (1)
Net realized/unrealized gains (losses) included in locations Other 0 0
Transfers into Level 3 174 99
Transfers out of Level 3 (454) (108)
Purchases 162 101
Issuances 0 0
Sales (238) (61)
Settlements 12 321
Balance at end of period, asset (liability), net 422 292
Unrealized gains (losses) still held 261 407
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 48 (56)
Net realized/unrealized gains (losses) included in principal transactions (136) 123
Net realized/unrealized gains (losses) included in locations Other 0 0
Transfers into Level 3 (96) 173
Transfers out of Level 3 40 (334)
Purchases 0 0
Issuances 0 0
Sales 0 0
Settlements 113 142
Balance at end of period, asset (liability), net (31) 48
Unrealized gains (losses) still held (130) (136)
Interest-bearing deposits    
Fair value, liabilities measured on recurring basis, level 3 fair-value category reconciliation    
Balance at beginning of period 206 215
Net realized/unrealized gains (losses) included in principal transactions 0 0
Net realized/unrealized gains (losses) included in locations Other (18) 11
Transfers into Level 3 0 278
Transfers out of Level 3 (44) (152)
Purchases 0 0
Issuance 38 34
Sales 0 0
Settlements (35) (158)
Balance at end of period 183 206
Unrealized gains (losses) still held (19) (142)
Federal funds purchased and securities loaned or sold under agreements to repurchase    
Fair value, liabilities measured on recurring basis, level 3 fair-value category reconciliation    
Balance at beginning of period 631 757
Net realized/unrealized gains (losses) included in principal transactions (9) 5
Net realized/unrealized gains (losses) included in locations Other 0 0
Transfers into Level 3 183 0
Transfers out of Level 3 (483) 0
Purchases 488 0
Issuance 0 0
Sales 0 0
Settlements (185) (121)
Balance at end of period 643 631
Unrealized gains (losses) still held 32 (18)
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 214 48
Net realized/unrealized gains (losses) included in principal transactions 48 (102)
Net realized/unrealized gains (losses) included in locations Other 0 0
Transfers into Level 3 87 271
Transfers out of Level 3 (34) (17)
Purchases 59 0
Issuance 0 0
Sales 0 10
Settlements (213) (200)
Balance at end of period 65 214
Unrealized gains (losses) still held (4) (163)
Trading account liabilities | Other trading liabilities    
Fair value, liabilities measured on recurring basis, level 3 fair-value category reconciliation    
Balance at beginning of period 26 0
Net realized/unrealized gains (losses) included in principal transactions 26 9
Net realized/unrealized gains (losses) included in locations Other 0 0
Transfers into Level 3 0 35
Transfers out of Level 3 0 0
Purchases 0 0
Issuance 0 0
Sales 0 0
Settlements 0 0
Balance at end of period 0 26
Unrealized gains (losses) still held 0 23
Short-term borrowings    
Fair value, liabilities measured on recurring basis, level 3 fair-value category reconciliation    
Balance at beginning of period 219 13
Net realized/unrealized gains (losses) included in principal transactions 43 78
Net realized/unrealized gains (losses) included in locations Other 0 0
Transfers into Level 3 137 220
Transfers out of Level 3 (57) (6)
Purchases 0 0
Issuance 49 86
Sales 0 0
Settlements (200) (16)
Balance at end of period 105 219
Unrealized gains (losses) still held (2) (91)
Long-term debt    
Fair value, Derivative assets (liabilities) measured on recurring basis, level 3 fair-value category reconciliation    
Transfers into Level 3 8,600  
Transfers out of Level 3 (9,800)  
Fair value, liabilities measured on recurring basis, level 3 fair-value category reconciliation    
Balance at beginning of period 25,210 17,169
Net realized/unrealized gains (losses) included in principal transactions 2,774 (1,489)
Net realized/unrealized gains (losses) included in locations Other 0 0
Transfers into Level 3 8,611 6,553
Transfers out of Level 3 (9,771) (2,615)
Purchases 0 0
Issuance 10,262 10,270
Sales 0 0
Settlements (6,029) (7,656)
Balance at end of period 25,509 25,210
Unrealized gains (losses) still held 1,756 (1,679)
Other financial liabilities    
Fair value, liabilities measured on recurring basis, level 3 fair-value category reconciliation    
Balance at beginning of period 1 0
Net realized/unrealized gains (losses) included in principal transactions 0 0
Net realized/unrealized gains (losses) included in locations Other (3) 0
Transfers into Level 3 0 0
Transfers out of Level 3 (4) 0
Purchases 0 0
Issuance 14 3
Sales 0 0
Settlements (13) (2)
Balance at end of period 1 1
Unrealized gains (losses) still held 0 0
Securities borrowed or purchased under agreements to resell    
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation    
Balance at beginning of period 320 303
Net realized/unrealized gains (losses) included in principal transactions (36) 23
Net realized/unrealized gains (losses) included in Other 0 0
Transfers into Level 3 45 0
Transfers out of Level 3 (49) 0
Purchases 362 194
Issuance 0 0
Sales 0 0
Settlements (411) (200)
Balance at end of period 231 320
Unrealized gains (losses) still held 0 43
Trading non-derivative assets    
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation    
Balance at beginning of period 3,647 2,455
Net realized/unrealized gains (losses) included in principal transactions 690 407
Net realized/unrealized gains (losses) included in Other 0 0
Transfers into Level 3 1,655 1,861
Transfers out of Level 3 (1,633) (730)
Purchases 4,169 4,086
Issuance 4 19
Sales (6,008) (4,426)
Settlements (4) (25)
Balance at end of period 2,520 3,647
Unrealized gains (losses) still held (79) (390)
Trading non-derivative assets | Mortgage-backed securities - U.S. government-sponsored agency guaranteed    
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation    
Balance at beginning of period 27 10
Net realized/unrealized gains (losses) included in principal transactions 8 (79)
Net realized/unrealized gains (losses) included in Other 0 0
Transfers into Level 3 355 21
Transfers out of Level 3 (131) (11)
Purchases 447 392
Issuance 0 0
Sales (210) (306)
Settlements 0 0
Balance at end of period 496 27
Unrealized gains (losses) still held 11 (1)
Trading non-derivative assets | Mortgage-backed securities - Residential    
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation    
Balance at beginning of period 340 123
Net realized/unrealized gains (losses) included in principal transactions 25 79
Net realized/unrealized gains (losses) included in Other 0 0
Transfers into Level 3 89 234
Transfers out of Level 3 (96) (68)
Purchases 282 486
Issuance 0 0
Sales (536) (514)
Settlements 0 0
Balance at end of period 104 340
Unrealized gains (losses) still held 13 (20)
Trading non-derivative assets | Mortgage-backed securities - Commercial    
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation    
Balance at beginning of period 136 61
Net realized/unrealized gains (losses) included in principal transactions 23 0
Net realized/unrealized gains (losses) included in Other 0 0
Transfers into Level 3 96 162
Transfers out of Level 3 (58) (35)
Purchases 62 174
Issuance 0 0
Sales (178) (226)
Settlements 0 0
Balance at end of period 81 136
Unrealized gains (losses) still held 0 (14)
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 503 194
Net realized/unrealized gains (losses) included in principal transactions 56 0
Net realized/unrealized gains (losses) included in Other 0 0
Transfers into Level 3 540 417
Transfers out of Level 3 (285) (114)
Purchases 791 1,052
Issuance 0 0
Sales (924) (1,046)
Settlements 0 0
Balance at end of period 681 503
Unrealized gains (losses) still held 24 (35)
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 0 0
Net realized/unrealized gains (losses) included in principal transactions 0 0
Net realized/unrealized gains (losses) included in Other 0 0
Transfers into Level 3 4 0
Transfers out of Level 3 0 0
Purchases 0 0
Issuance 0 0
Sales 0 0
Settlements 0 0
Balance at end of period 4 0
Unrealized gains (losses) still held 0 0
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 94 64
Net realized/unrealized gains (losses) included in principal transactions (4) 2
Net realized/unrealized gains (losses) included in Other 0 0
Transfers into Level 3 20 33
Transfers out of Level 3 (29) (3)
Purchases 17 62
Issuance 0 0
Sales (61) (64)
Settlements 0 0
Balance at end of period 37 94
Unrealized gains (losses) still held (6) 4
Trading non-derivative assets | Foreign government    
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation    
Balance at beginning of period 51 52
Net realized/unrealized gains (losses) included in principal transactions 29 (35)
Net realized/unrealized gains (losses) included in Other 0 0
Transfers into Level 3 143 9
Transfers out of Level 3 (129) (1)
Purchases 83 169
Issuance 0 0
Sales (154) (143)
Settlements 0 0
Balance at end of period 23 51
Unrealized gains (losses) still held (2) (7)
Trading non-derivative assets | Corporate    
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation    
Balance at beginning of period 375 313
Net realized/unrealized gains (losses) included in principal transactions 74 246
Net realized/unrealized gains (losses) included in Other 0 0
Transfers into Level 3 461 211
Transfers out of Level 3 (384) (136)
Purchases 867 770
Issuance 0 0
Sales (981) (1,023)
Settlements 0 (6)
Balance at end of period 412 375
Unrealized gains (losses) still held (38) (37)
Trading non-derivative assets | Equity securities    
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation    
Balance at beginning of period 73 100
Net realized/unrealized gains (losses) included in principal transactions 67 (16)
Net realized/unrealized gains (losses) included in Other 0 0
Transfers into Level 3 156 43
Transfers out of Level 3 (52) (2)
Purchases 118 240
Issuance 0 0
Sales (188) (292)
Settlements 0 0
Balance at end of period 174 73
Unrealized gains (losses) still held 23 (11)
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 1,606 1,177
Net realized/unrealized gains (losses) included in principal transactions 371 (105)
Net realized/unrealized gains (losses) included in Other 0 0
Transfers into Level 3 173 677
Transfers out of Level 3 (297) (131)
Purchases 1,313 1,406
Issuance 0 0
Sales (2,553) (1,418)
Settlements 0 0
Balance at end of period 613 1,606
Unrealized gains (losses) still held (43) (248)
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 945 555
Net realized/unrealized gains (losses) included in principal transactions 97 315
Net realized/unrealized gains (losses) included in Other 0 0
Transfers into Level 3 158 471
Transfers out of Level 3 (457) (343)
Purchases 980 387
Issuance 4 19
Sales (1,147) (440)
Settlements (4) (19)
Balance at end of period 576 945
Unrealized gains (losses) still held (37) (56)
Investments    
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation    
Balance at beginning of period 1,542 1,259
Net realized/unrealized gains (losses) included in principal transactions 0 0
Net realized/unrealized gains (losses) included in Other (130) 48
Transfers into Level 3 904 401
Transfers out of Level 3 (739) (349)
Purchases 1,012 667
Issuance 0 3
Sales (362) (430)
Settlements 0 (57)
Balance at end of period 2,227 1,542
Unrealized gains (losses) still held (19) (117)
Investments | Mortgage-backed securities - 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 32
Net realized/unrealized gains (losses) included in principal transactions 0 0
Net realized/unrealized gains (losses) included in Other 2 (5)
Transfers into Level 3 42 2
Transfers out of Level 3 (10) 0
Purchases 3 1
Issuance 0 0
Sales (16) 0
Settlements 0 0
Balance at end of period 51 30
Unrealized gains (losses) still held 2 (104)
Investments | Mortgage-backed securities - Residential    
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 0 76
Transfers into Level 3 54 0
Transfers out of Level 3 (12) 0
Purchases 52 0
Issuance 0 0
Sales 0 (76)
Settlements 0 0
Balance at end of period 94 0
Unrealized gains (losses) still held (1) 5
Investments | Mortgage-backed securities - 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 0
Net realized/unrealized gains (losses) included in Other 0 0
Transfers into Level 3 0 0
Transfers out of Level 3 0 0
Purchases 0 0
Issuance 0 0
Sales 0 0
Settlements 0 0
Balance at end of period 0 0
Unrealized gains (losses) still held 0 0
Investments | Mortgage-backed securities    
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation    
Balance at beginning of period 30 32
Net realized/unrealized gains (losses) included in principal transactions 0 0
Net realized/unrealized gains (losses) included in Other 2 71
Transfers into Level 3 96 2
Transfers out of Level 3 (22) 0
Purchases 55 1
Issuance 0 0
Sales (16) (76)
Settlements 0 0
Balance at end of period 145 30
Unrealized gains (losses) still held 1 (99)
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 0
Net realized/unrealized gains (losses) included in principal transactions 0 0
Net realized/unrealized gains (losses) included in Other 0 0
Transfers into Level 3 1 0
Transfers out of Level 3 0 0
Purchases 0 0
Issuance 0 0
Sales 0 0
Settlements 0 0
Balance at end of period 1 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 834 623
Net realized/unrealized gains (losses) included in principal transactions 0 0
Net realized/unrealized gains (losses) included in Other (21) (3)
Transfers into Level 3 58 322
Transfers out of Level 3 (108) (131)
Purchases 49 121
Issuance 0 0
Sales (40) (98)
Settlements 0 0
Balance at end of period 772 834
Unrealized gains (losses) still held (12) (20)
Investments | Foreign government    
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation    
Balance at beginning of period 268 96
Net realized/unrealized gains (losses) included in principal transactions 0 0
Net realized/unrealized gains (losses) included in Other (49) 11
Transfers into Level 3 512 27
Transfers out of Level 3 (565) (64)
Purchases 871 381
Issuance 0 0
Sales (251) (183)
Settlements 0 0
Balance at end of period 786 268
Unrealized gains (losses) still held (2) (4)
Investments | Corporate    
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation    
Balance at beginning of period 60 45
Net realized/unrealized gains (losses) included in principal transactions 0 0
Net realized/unrealized gains (losses) included in Other (14) 6
Transfers into Level 3 183 49
Transfers out of Level 3 (44) (152)
Purchases 37 162
Issuance 0 0
Sales (34) (50)
Settlements 0 0
Balance at end of period 188 60
Unrealized gains (losses) still held 2 0
Investments | Equity 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 0 (1)
Transfers into Level 3 16 1
Transfers out of Level 3 0 0
Purchases 0 0
Issuance 0 0
Sales 0 0
Settlements 0 0
Balance at end of period 16 0
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 22
Net realized/unrealized gains (losses) included in principal transactions 0 0
Net realized/unrealized gains (losses) included in Other (21) (1)
Transfers into Level 3 36 0
Transfers out of Level 3 0 0
Purchases 0 0
Issuance 0 0
Sales (13) (20)
Settlements 0 0
Balance at end of period 3 1
Unrealized gains (losses) still held (2) (4)
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 0 0
Transfers into Level 3 0 0
Transfers out of Level 3 0 0
Purchases 0 0
Issuance 0 0
Sales 0 0
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 349 441
Net realized/unrealized gains (losses) included in principal transactions 0 0
Net realized/unrealized gains (losses) included in Other (27) (35)
Transfers into Level 3 2 0
Transfers out of Level 3 0 (2)
Purchases 0 2
Issuance 0 3
Sales (8) (3)
Settlements 0 (57)
Balance at end of period 316 349
Unrealized gains (losses) still held (6) 10
Loans    
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation    
Balance at beginning of period 1,985 402
Net realized/unrealized gains (losses) included in principal transactions 0 0
Net realized/unrealized gains (losses) included in Other 90 1,143
Transfers into Level 3 311 451
Transfers out of Level 3 (2,071) (6)
Purchases 0 0
Issuance 529 0
Sales 0 0
Settlements (133) (5)
Balance at end of period 711 1,985
Unrealized gains (losses) still held (77) 1,424
Fair value, Derivative assets (liabilities) measured on recurring basis, level 3 fair-value category reconciliation    
Transfers out of Level 3 (2,100)  
Mortgage servicing rights    
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation    
Balance at beginning of period 336 495
Net realized/unrealized gains (losses) included in principal transactions 0 0
Net realized/unrealized gains (losses) included in Other 43 (204)
Transfers into Level 3 0 0
Transfers out of Level 3 0 0
Purchases 0 0
Issuance 92 123
Sales 0 0
Settlements (67) (78)
Balance at end of period 404 336
Unrealized gains (losses) still held 52 (180)
Other financial assets measured on a recurring basis    
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 6 0
Transfers into Level 3 65 0
Transfers out of Level 3 (27) 0
Purchases 58 0
Issuance 0 0
Sales (26) (1)
Settlements (3) 0
Balance at end of period 73 0
Unrealized gains (losses) still held $ 0 $ 0