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FAIR VALUE MEASUREMENT - Level 3 Roll Forward (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
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 $ (1,715) $ (901)
Net realized/unrealized gains (losses) included in principal transactions 120 (915)
Net realized/unrealized gains (losses) included in locations Other 0 0
Transfers into Level 3 1,336 (319)
Transfers out of Level 3 0 538
Purchases 251 408
Issuances 134 (102)
Sales (1,036) (242)
Settlements (297) (182)
Balance at end of period, asset (liability), net (1,207) (1,715)
Unrealized gains (losses) still held (3,306) 1,316
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 (154)
Net realized/unrealized gains (losses) included in principal transactions 429 116
Net realized/unrealized gains (losses) included in locations Other 0 0
Transfers into Level 3 1,644 (129)
Transfers out of Level 3 16 172
Purchases 41 154
Issuances 134 45
Sales (34) (1)
Settlements (617) (202)
Balance at end of period, asset (liability), net 1,614 1
Unrealized gains (losses) still held 161 2,194
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 (5) (6)
Net realized/unrealized gains (losses) included in principal transactions 105 (73)
Net realized/unrealized gains (losses) included in locations Other 0 0
Transfers into Level 3 (61) 152
Transfers out of Level 3 48 (97)
Purchases 74 113
Issuances 0 0
Sales (55) (114)
Settlements (54) 20
Balance at end of period, asset (liability), net 52 (5)
Unrealized gains (losses) still held 130 (134)
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 (1,596) (784)
Net realized/unrealized gains (losses) included in principal transactions (536) (425)
Net realized/unrealized gains (losses) included in locations Other 0 0
Transfers into Level 3 (519) (213)
Transfers out of Level 3 378 274
Purchases 35 (111)
Issuances 0 (147)
Sales (886) (8)
Settlements (89) (182)
Balance at end of period, asset (liability), net (3,213) (1,596)
Unrealized gains (losses) still held (3,868) (422)
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 (59) (18)
Net realized/unrealized gains (losses) included in principal transactions (1) (121)
Net realized/unrealized gains (losses) included in locations Other 0 0
Transfers into Level 3 99 (15)
Transfers out of Level 3 (108) (15)
Purchases 101 252
Issuances 0 0
Sales (61) (133)
Settlements 321 (9)
Balance at end of period, asset (liability), net 292 (59)
Unrealized gains (losses) still held 407 (33)
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 (56) 61
Net realized/unrealized gains (losses) included in principal transactions 123 (412)
Net realized/unrealized gains (losses) included in locations Other 0 0
Transfers into Level 3 173 (114)
Transfers out of Level 3 (334) 204
Purchases 0 0
Issuances 0 0
Sales 0 14
Settlements 142 191
Balance at end of period, asset (liability), net 48 (56)
Unrealized gains (losses) still held (136) (289)
Interest-bearing deposits    
Fair value, liabilities measured on recurring basis, level 3 fair-value category reconciliation    
Balance at beginning of period 215 495
Net realized/unrealized gains (losses) included in principal transactions 0 0
Net realized/unrealized gains (losses) included in locations Other 11 (16)
Transfers into Level 3 278 10
Transfers out of Level 3 (152) (783)
Purchases 0 0
Issuance 34 843
Sales 0 0
Settlements (158) (366)
Balance at end of period 206 215
Unrealized gains (losses) still held (142) (25)
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 757 983
Net realized/unrealized gains (losses) included in principal transactions 5 121
Net realized/unrealized gains (losses) included in locations Other 0 0
Transfers into Level 3 0 1
Transfers out of Level 3 0 4
Purchases 0 0
Issuance 0 0
Sales 0 (168)
Settlements (121) 58
Balance at end of period 631 757
Unrealized gains (losses) still held (18) (26)
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 48 586
Net realized/unrealized gains (losses) included in principal transactions (102) 122
Net realized/unrealized gains (losses) included in locations Other 0 0
Transfers into Level 3 271 68
Transfers out of Level 3 (17) (443)
Purchases 0 19
Issuance 0 0
Sales 10 (12)
Settlements (200) (48)
Balance at end of period 214 48
Unrealized gains (losses) still held (163) 3
Trading account liabilities | Other trading liabilities    
Fair value, liabilities 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 9 0
Net realized/unrealized gains (losses) included in locations Other 0 0
Transfers into Level 3 35 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 26 0
Unrealized gains (losses) still held 23 0
Short-term borrowings    
Fair value, liabilities measured on recurring basis, level 3 fair-value category reconciliation    
Balance at beginning of period 13 37
Net realized/unrealized gains (losses) included in principal transactions 78 32
Net realized/unrealized gains (losses) included in locations Other 0 0
Transfers into Level 3 220 13
Transfers out of Level 3 (6) (42)
Purchases 0 0
Issuance 86 168
Sales 0 0
Settlements (16) (131)
Balance at end of period 219 13
Unrealized gains (losses) still held (91) (1)
Long-term debt    
Fair value, Derivative assets (liabilities) measured on recurring basis, level 3 fair-value category reconciliation    
Transfers into Level 3 6,600  
Transfers out of Level 3 (2,600)  
Fair value, liabilities measured on recurring basis, level 3 fair-value category reconciliation    
Balance at beginning of period 17,169 12,570
Net realized/unrealized gains (losses) included in principal transactions (1,489) (1,899)
Net realized/unrealized gains (losses) included in locations Other 0 0
Transfers into Level 3 6,553 3,304
Transfers out of Level 3 (2,615) (4,411)
Purchases 0 0
Issuance 10,270 6,766
Sales 0 0
Settlements (7,656) (2,958)
Balance at end of period 25,210 17,169
Unrealized gains (losses) still held (1,679) (1,411)
Other financial liabilities    
Fair value, liabilities 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 locations Other 0 4
Transfers into Level 3 0 5
Transfers out of Level 3 0 0
Purchases 0 0
Issuance 3 4
Sales 0 0
Settlements (2) (5)
Balance at end of period 1 0
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 303 115
Net realized/unrealized gains (losses) included in principal transactions 23 (5)
Net realized/unrealized gains (losses) included in Other 0 0
Transfers into Level 3 0 191
Transfers out of Level 3 0 (4)
Purchases 194 195
Issuance 0 0
Sales 0 0
Settlements (200) (189)
Balance at end of period 320 303
Unrealized gains (losses) still held 43 3
Trading non-derivative assets    
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation    
Balance at beginning of period 2,455 3,548
Net realized/unrealized gains (losses) included in principal transactions 407 192
Net realized/unrealized gains (losses) included in Other 0 0
Transfers into Level 3 1,861 677
Transfers out of Level 3 (730) (798)
Purchases 4,086 2,409
Issuance 19 6
Sales (4,426) (3,539)
Settlements (25) (40)
Balance at end of period 3,647 2,455
Unrealized gains (losses) still held (390) (284)
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 10 156
Net realized/unrealized gains (losses) included in principal transactions (79) 0
Net realized/unrealized gains (losses) included in Other 0 0
Transfers into Level 3 21 54
Transfers out of Level 3 (11) (72)
Purchases 392 160
Issuance 0 (1)
Sales (306) (287)
Settlements 0 0
Balance at end of period 27 10
Unrealized gains (losses) still held (1) 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 123 268
Net realized/unrealized gains (losses) included in principal transactions 79 15
Net realized/unrealized gains (losses) included in Other 0 0
Transfers into Level 3 234 86
Transfers out of Level 3 (68) (80)
Purchases 486 227
Issuance 0 0
Sales (514) (393)
Settlements 0 0
Balance at end of period 340 123
Unrealized gains (losses) still held (20) 10
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 61 77
Net realized/unrealized gains (losses) included in principal transactions 0 14
Net realized/unrealized gains (losses) included in Other 0 0
Transfers into Level 3 162 150
Transfers out of Level 3 (35) (105)
Purchases 174 136
Issuance 0 0
Sales (226) (211)
Settlements 0 0
Balance at end of period 136 61
Unrealized gains (losses) still held (14) (4)
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 194 501
Net realized/unrealized gains (losses) included in principal transactions 0 29
Net realized/unrealized gains (losses) included in Other 0 0
Transfers into Level 3 417 290
Transfers out of Level 3 (114) (257)
Purchases 1,052 523
Issuance 0 (1)
Sales (1,046) (891)
Settlements 0 0
Balance at end of period 503 194
Unrealized gains (losses) still held (35) 7
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 1
Net realized/unrealized gains (losses) included in principal transactions 0 (9)
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 20
Issuance 0 0
Sales 0 (11)
Settlements 0 (1)
Balance at end of period 0 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 64 200
Net realized/unrealized gains (losses) included in principal transactions 2 (2)
Net realized/unrealized gains (losses) included in Other 0 0
Transfers into Level 3 33 1
Transfers out of Level 3 (3) (19)
Purchases 62 2
Issuance 0 0
Sales (64) (118)
Settlements 0 0
Balance at end of period 94 64
Unrealized gains (losses) still held 4 (2)
Trading non-derivative assets | Foreign government    
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation    
Balance at beginning of period 52 31
Net realized/unrealized gains (losses) included in principal transactions (35) 28
Net realized/unrealized gains (losses) included in Other 0 0
Transfers into Level 3 9 12
Transfers out of Level 3 (1) (7)
Purchases 169 88
Issuance 0 0
Sales (143) (100)
Settlements 0 0
Balance at end of period 51 52
Unrealized gains (losses) still held (7) 1
Trading non-derivative assets | Corporate    
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation    
Balance at beginning of period 313 360
Net realized/unrealized gains (losses) included in principal transactions 246 284
Net realized/unrealized gains (losses) included in Other 0 0
Transfers into Level 3 211 213
Transfers out of Level 3 (136) (86)
Purchases 770 323
Issuance 0 (29)
Sales (1,023) (742)
Settlements (6) (10)
Balance at end of period 375 313
Unrealized gains (losses) still held (37) (11)
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 100 153
Net realized/unrealized gains (losses) included in principal transactions (16) (21)
Net realized/unrealized gains (losses) included in Other 0 0
Transfers into Level 3 43 13
Transfers out of Level 3 (2) (19)
Purchases 240 117
Issuance 0 0
Sales (292) (143)
Settlements 0 0
Balance at end of period 73 100
Unrealized gains (losses) still held (11) (51)
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 1,177 1,484
Net realized/unrealized gains (losses) included in principal transactions (105) (65)
Net realized/unrealized gains (losses) included in Other 0 0
Transfers into Level 3 677 51
Transfers out of Level 3 (131) (127)
Purchases 1,406 738
Issuance 0 0
Sales (1,418) (904)
Settlements 0 0
Balance at end of period 1,606 1,177
Unrealized gains (losses) still held (248) 29
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 555 818
Net realized/unrealized gains (losses) included in principal transactions 315 (52)
Net realized/unrealized gains (losses) included in Other 0 0
Transfers into Level 3 471 97
Transfers out of Level 3 (343) (283)
Purchases 387 598
Issuance 19 36
Sales (440) (630)
Settlements (19) (29)
Balance at end of period 945 555
Unrealized gains (losses) still held (56) (257)
Investments    
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation    
Balance at beginning of period 1,259 1,737
Net realized/unrealized gains (losses) included in principal transactions 0 0
Net realized/unrealized gains (losses) included in Other 48 52
Transfers into Level 3 401 178
Transfers out of Level 3 (349) (1,025)
Purchases 667 1,136
Issuance 3 0
Sales (430) (787)
Settlements (57) (32)
Balance at end of period 1,542 1,259
Unrealized gains (losses) still held (117) 112
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 32 32
Net realized/unrealized gains (losses) included in principal transactions 0 0
Net realized/unrealized gains (losses) included in Other (5) 0
Transfers into Level 3 2 0
Transfers out of Level 3 0 0
Purchases 1 0
Issuance 0 0
Sales 0 0
Settlements 0 0
Balance at end of period 30 32
Unrealized gains (losses) still held (104) (1)
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 76 0
Transfers into Level 3 0 0
Transfers out of Level 3 0 0
Purchases 0 0
Issuance 0 0
Sales (76) 0
Settlements 0 0
Balance at end of period 0 0
Unrealized gains (losses) still held 5 0
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 32 32
Net realized/unrealized gains (losses) included in principal transactions 0 0
Net realized/unrealized gains (losses) included in Other 71 0
Transfers into Level 3 2 0
Transfers out of Level 3 0 0
Purchases 1 0
Issuance 0 0
Sales (76) 0
Settlements 0 0
Balance at end of period 30 32
Unrealized gains (losses) still held (99) (1)
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 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 | State and municipal    
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation    
Balance at beginning of period 623 708
Net realized/unrealized gains (losses) included in principal transactions 0 0
Net realized/unrealized gains (losses) included in Other (3) 86
Transfers into Level 3 322 14
Transfers out of Level 3 (131) (318)
Purchases 121 430
Issuance 0 0
Sales (98) (297)
Settlements 0 0
Balance at end of period 834 623
Unrealized gains (losses) still held (20) 82
Investments | Foreign government    
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation    
Balance at beginning of period 96 68
Net realized/unrealized gains (losses) included in principal transactions 0 0
Net realized/unrealized gains (losses) included in Other 11 2
Transfers into Level 3 27 0
Transfers out of Level 3 (64) 0
Purchases 381 145
Issuance 0 0
Sales (183) (119)
Settlements 0 0
Balance at end of period 268 96
Unrealized gains (losses) still held (4) 2
Investments | Corporate    
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation    
Balance at beginning of period 45 156
Net realized/unrealized gains (losses) included in principal transactions 0 0
Net realized/unrealized gains (losses) included in Other 6 (14)
Transfers into Level 3 49 3
Transfers out of Level 3 (152) (94)
Purchases 162 0
Issuance 0 0
Sales (50) (6)
Settlements 0 0
Balance at end of period 60 45
Unrealized gains (losses) still held 0 0
Investments | Marketable 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 (1) 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 0 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 22 187
Net realized/unrealized gains (losses) included in principal transactions 0 0
Net realized/unrealized gains (losses) included in Other (1) (11)
Transfers into Level 3 0 122
Transfers out of Level 3 0 (612)
Purchases 0 550
Issuance 0 0
Sales (20) (214)
Settlements 0 0
Balance at end of period 1 22
Unrealized gains (losses) still held (4) 13
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 441 586
Net realized/unrealized gains (losses) included in principal transactions 0 0
Net realized/unrealized gains (losses) included in Other (35) (11)
Transfers into Level 3 0 39
Transfers out of Level 3 (2) (1)
Purchases 2 11
Issuance 3 0
Sales (3) (151)
Settlements (57) (32)
Balance at end of period 349 441
Unrealized gains (losses) still held 10 16
Loans    
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation    
Balance at beginning of period 402 277
Net realized/unrealized gains (losses) included in principal transactions 0 0
Net realized/unrealized gains (losses) included in Other 1,143 192
Transfers into Level 3 451 148
Transfers out of Level 3 (6) (189)
Purchases 0 16
Issuance 0 0
Sales 0 (40)
Settlements (5) (2)
Balance at end of period 1,985 402
Unrealized gains (losses) still held 1,424 186
Mortgage servicing rights    
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation    
Balance at beginning of period 495 584
Net realized/unrealized gains (losses) included in principal transactions 0 0
Net realized/unrealized gains (losses) included in Other (204) (84)
Transfers into Level 3 0 0
Transfers out of Level 3 0 0
Purchases 0 0
Issuance 123 70
Sales 0 0
Settlements (78) (75)
Balance at end of period 336 495
Unrealized gains (losses) still held (180) (68)
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 1 0
Net realized/unrealized gains (losses) included in principal transactions 0 0
Net realized/unrealized gains (losses) included in Other 0 96
Transfers into Level 3 0 6
Transfers out of Level 3 0 (2)
Purchases 0 2
Issuance 0 32
Sales (1) (21)
Settlements 0 (112)
Balance at end of period 0 1
Unrealized gains (losses) still held $ 0 $ 18