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FAIR VALUE MEASUREMENT - Level 3 Roll Forward (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Equity securities    
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation    
Transfers out of Level 3   $ (4,000)
Non-marketable equity securities    
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation    
Transfers out of Level 3   (3,200)
Hedging derivatives    
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation    
Transfers out of Level 3   (500)
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 $ (4,753) (2,229)
Net realized/unrealized gains (losses) included in Principal Transactions (1,221) (2,833)
Net realized/unrealized gains (losses) included in Other 0 0
Transfers into Level 3 (84) 22
Transfers out of Level 3 631 (1,185)
Purchases 377 849
Issuances (176) 20
Sales (685) (832)
Settlements 932 1,435
Balance at end of period, asset (liability), net (4,979) (4,753)
Unrealized gains (losses) still held (296) (2,002)
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 (663) (495)
Net realized/unrealized gains (losses) included in Principal Transactions (44) (146)
Net realized/unrealized gains (losses) included in Other 0 0
Transfers into Level 3 (28) 301
Transfers out of Level 3 610 (239)
Purchases 154 163
Issuances (13) (18)
Sales (322) (142)
Settlements (116) (87)
Balance at end of period, asset (liability), net (422) (663)
Unrealized gains (losses) still held 77 26
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 413 620
Net realized/unrealized gains (losses) included in Principal Transactions (438) (276)
Net realized/unrealized gains (losses) included in Other 0 0
Transfers into Level 3 54 75
Transfers out of Level 3 (60) (106)
Purchases 33 200
Issuances 14 0
Sales (21) (181)
Settlements 135 81
Balance at end of period, asset (liability), net 130 413
Unrealized gains (losses) still held (139) 23
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 (1,557) (800)
Net realized/unrealized gains (losses) included in Principal Transactions 129 (89)
Net realized/unrealized gains (losses) included in Other 0 0
Transfers into Level 3 (159) 63
Transfers out of Level 3 28 (772)
Purchases 184 92
Issuances (216) 38
Sales (333) (128)
Settlements (103) 39
Balance at end of period, asset (liability), net (2,027) (1,557)
Unrealized gains (losses) still held (214) (33)
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 (1,945) (1,861)
Net realized/unrealized gains (losses) included in Principal Transactions (384) (352)
Net realized/unrealized gains (losses) included in Other 0 0
Transfers into Level 3 77 (425)
Transfers out of Level 3 35 (39)
Purchases 0 357
Issuances 23 0
Sales (3) (347)
Settlements 336 722
Balance at end of period, asset (liability), net (1,861) (1,945)
Unrealized gains (losses) still held 149 (164)
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 (1,001) 307
Net realized/unrealized gains (losses) included in Principal Transactions (484) (1,970)
Net realized/unrealized gains (losses) included in Other 0 0
Transfers into Level 3 (28) 8
Transfers out of Level 3 18 (29)
Purchases 6 37
Issuances 16 0
Sales (6) (34)
Settlements 680 680
Balance at end of period, asset (liability), net (799) (1,001)
Unrealized gains (losses) still held (169) (1,854)
Interest-bearing deposits    
Fair value, liabilities measured on recurring basis, level 3 fair-value category reconciliation    
Balance at beginning of period 293 434
Net realized/unrealized gains (losses) included in Principal Transactions 0 0
Net realized/unrealized gains (losses) included in locations Other 25 43
Transfers into Level 3 40 322
Transfers out of Level 3 0 (309)
Purchases 0 0
Issuance 2 5
Sales 0 0
Settlements (24) (116)
Balance at end of period 286 293
Unrealized gains (losses) still held 22 46
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 849 1,247
Net realized/unrealized gains (losses) included in Principal Transactions 14 (6)
Net realized/unrealized gains (losses) included in locations Other 0 0
Transfers into Level 3 0 0
Transfers out of Level 3 0 (150)
Purchases 0 0
Issuance 36 0
Sales 0 27
Settlements (145) (281)
Balance at end of period 726 849
Unrealized gains (losses) still held 10 (12)
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 1,177 199
Net realized/unrealized gains (losses) included in Principal Transactions 385 17
Net realized/unrealized gains (losses) included in locations Other 0 0
Transfers into Level 3 22 1,185
Transfers out of Level 3 (796) (109)
Purchases 0 (70)
Issuance 17 (41)
Sales 277 367
Settlements (290) (337)
Balance at end of period 22 1,177
Unrealized gains (losses) still held 8 (43)
Trading account liabilities | Other trading 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 0 0
Transfers into Level 3 4 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 5 1
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 42 9
Net realized/unrealized gains (losses) included in Principal Transactions 32 (16)
Net realized/unrealized gains (losses) included in locations Other 0 0
Transfers into Level 3 4 19
Transfers out of Level 3 (7) (37)
Purchases 0 0
Issuance 31 87
Sales 0 0
Settlements (20) (52)
Balance at end of period 18 42
Unrealized gains (losses) still held (3) 0
Long-term debt    
Fair value, liabilities measured on recurring basis, level 3 fair-value category reconciliation    
Balance at beginning of period 9,744 7,543
Net realized/unrealized gains (losses) included in Principal Transactions (1,083) (282)
Net realized/unrealized gains (losses) included in locations Other 0 0
Transfers into Level 3 1,251 3,792
Transfers out of Level 3 (1,836) (4,350)
Purchases 44 0
Issuance 2,712 4,845
Sales 0 (3)
Settlements 84 (2,365)
Balance at end of period 13,082 9,744
Unrealized gains (losses) still held (1,554) (419)
Other financial liabilities    
Fair value, liabilities measured on recurring basis, level 3 fair-value category reconciliation    
Balance at beginning of period 8 14
Net realized/unrealized gains (losses) included in Principal Transactions 0 0
Net realized/unrealized gains (losses) included in locations Other 0 (11)
Transfers into Level 3 5 2
Transfers out of Level 3 0 (12)
Purchases 0 (8)
Issuance 5 12
Sales (1) 0
Settlements (9) (11)
Balance at end of period 8 8
Unrealized gains (losses) still held (1) (13)
Federal funds sold and 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 1,496 1,337
Net realized/unrealized gains (losses) included in principal transactions (281) (20)
Net realized/unrealized gains (losses) included in Other 0 0
Transfers into Level 3 0 0
Transfers out of Level 3 (1,198) (28)
Purchases 0 758
Issuance 0 0
Sales 0 0
Settlements (1) (551)
Balance at end of period 16 1,496
Unrealized gains (losses) still held 1 (16)
Trading non-derivative assets    
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation    
Balance at beginning of period 6,251 12,418
Net realized/unrealized gains (losses) included in principal transactions 952 (79)
Net realized/unrealized gains (losses) included in Other 0 0
Transfers into Level 3 1,321 3,835
Transfers out of Level 3 (3,737) (9,045)
Purchases 5,676 9,376
Issuance (23) 8
Sales (7,155) (10,235)
Settlements (11) (27)
Balance at end of period 3,274 6,251
Unrealized gains (losses) still held 196 (647)
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 176 744
Net realized/unrealized gains (losses) included in principal transactions 23 6
Net realized/unrealized gains (losses) included in Other 0 0
Transfers into Level 3 176 510
Transfers out of Level 3 (174) (1,087)
Purchases 463 941
Issuance 0 0
Sales (504) (961)
Settlements 3 23
Balance at end of period 163 176
Unrealized gains (losses) still held 2 (7)
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 399 1,326
Net realized/unrealized gains (losses) included in principal transactions 86 104
Net realized/unrealized gains (losses) included in Other 0 0
Transfers into Level 3 95 189
Transfers out of Level 3 (118) (162)
Purchases 126 324
Issuance 0 0
Sales (424) (1,376)
Settlements 0 (6)
Balance at end of period 164 399
Unrealized gains (losses) still held 14 26
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 206 517
Net realized/unrealized gains (losses) included in principal transactions 15 (1)
Net realized/unrealized gains (losses) included in Other 0 0
Transfers into Level 3 69 193
Transfers out of Level 3 (57) (234)
Purchases 450 759
Issuance 0 0
Sales (626) (1,028)
Settlements 0 0
Balance at end of period 57 206
Unrealized gains (losses) still held (5) (27)
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 781 2,587
Net realized/unrealized gains (losses) included in principal transactions 124 109
Net realized/unrealized gains (losses) included in Other 0 0
Transfers into Level 3 340 892
Transfers out of Level 3 (349) (1,483)
Purchases 1,039 2,024
Issuance 0 0
Sales (1,554) (3,365)
Settlements 3 17
Balance at end of period 384 781
Unrealized gains (losses) still held 11 (8)
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 1
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 2
Transfers out of Level 3 0 0
Purchases 0 0
Issuance 0 0
Sales (1) (2)
Settlements 0 0
Balance at end of period 0 1
Unrealized gains (losses) still held 0 0
Trading non-derivative assets | State and municipal securities    
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation    
Balance at beginning of period 296 351
Net realized/unrealized gains (losses) included in principal transactions 28 23
Net realized/unrealized gains (losses) included in Other 0 0
Transfers into Level 3 24 195
Transfers out of Level 3 (48) (256)
Purchases 161 322
Issuance (23) 0
Sales (164) (339)
Settlements 0 0
Balance at end of period 274 296
Unrealized gains (losses) still held 8 (88)
Trading non-derivative assets | Foreign government    
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation    
Balance at beginning of period 40 197
Net realized/unrealized gains (losses) included in principal transactions 1 (9)
Net realized/unrealized gains (losses) included in Other 0 0
Transfers into Level 3 89 21
Transfers out of Level 3 (228) (49)
Purchases 291 115
Issuance 0 0
Sales (177) (235)
Settlements 0 0
Balance at end of period 16 40
Unrealized gains (losses) still held 0 (16)
Trading non-derivative assets | Corporate    
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation    
Balance at beginning of period 324 376
Net realized/unrealized gains (losses) included in principal transactions 344 330
Net realized/unrealized gains (losses) included in Other 0 0
Transfers into Level 3 140 171
Transfers out of Level 3 (185) (132)
Purchases 482 867
Issuance (8) 0
Sales (828) (1,295)
Settlements 6 7
Balance at end of period 275 324
Unrealized gains (losses) still held 81 69
Trading non-derivative assets | Equity securities    
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation    
Balance at beginning of period 127 3,684
Net realized/unrealized gains (losses) included in principal transactions 54 (527)
Net realized/unrealized gains (losses) included in Other 0 0
Transfers into Level 3 210 279
Transfers out of Level 3 (58) (4,057)
Purchases 51 955
Issuance (3) (11)
Sales (261) (196)
Settlements 0 0
Balance at end of period 120 127
Unrealized gains (losses) still held 0 (457)
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 1,868 2,739
Net realized/unrealized gains (losses) included in principal transactions 284 53
Net realized/unrealized gains (losses) included in Other 0 0
Transfers into Level 3 44 205
Transfers out of Level 3 (178) (360)
Purchases 1,457 2,199
Issuance 0 0
Sales (1,885) (2,965)
Settlements 0 (3)
Balance at end of period 1,590 1,868
Unrealized gains (losses) still held 36 (46)
Trading non-derivative assets | Other debt securities    
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation    
Balance at beginning of period 2,814 2,483
Net realized/unrealized gains (losses) included in principal transactions 117 (58)
Net realized/unrealized gains (losses) included in Other 0 0
Transfers into Level 3 474 2,070
Transfers out of Level 3 (2,691) (2,708)
Purchases 2,195 2,894
Issuance 11 19
Sales (2,285) (1,838)
Settlements (20) (48)
Balance at end of period 615 2,814
Unrealized gains (losses) still held 60 (101)
Investments    
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation    
Balance at beginning of period 3,861 5,059
Net realized/unrealized gains (losses) included in principal transactions 0 0
Net realized/unrealized gains (losses) included in Other (175) 99
Transfers into Level 3 186 954
Transfers out of Level 3 (1,021) (2,054)
Purchases 1,812 1,842
Issuance 0 0
Sales (1,958) (1,557)
Settlements (268) (482)
Balance at end of period 2,437 3,861
Unrealized gains (losses) still held 99 (109)
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 101 139
Net realized/unrealized gains (losses) included in principal transactions 0 0
Net realized/unrealized gains (losses) included in Other 16 (26)
Transfers into Level 3 1 25
Transfers out of Level 3 (94) (72)
Purchases 0 45
Issuance 0 0
Sales 0 (9)
Settlements 0 (1)
Balance at end of period 24 101
Unrealized gains (losses) still held (2) 54
Investments | Mortgage-backed securities - Residential    
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation    
Balance at beginning of period 50 4
Net realized/unrealized gains (losses) included in principal transactions 0 0
Net realized/unrealized gains (losses) included in Other 2 3
Transfers into Level 3 0 49
Transfers out of Level 3 (47) 0
Purchases 0 26
Issuance 0 0
Sales (5) (32)
Settlements 0 0
Balance at end of period 0 50
Unrealized gains (losses) still held 0 2
Investments | Mortgage-backed securities - Commercial    
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation    
Balance at beginning of period 0 2
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 3 6
Transfers out of Level 3 0 (7)
Purchases 12 0
Issuance 0 0
Sales (12) 0
Settlements 0 0
Balance at end of period 3 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 151 145
Net realized/unrealized gains (losses) included in principal transactions 0 0
Net realized/unrealized gains (losses) included in Other 18 (24)
Transfers into Level 3 4 80
Transfers out of Level 3 (141) (79)
Purchases 12 71
Issuance 0 0
Sales (17) (41)
Settlements 0 (1)
Balance at end of period 27 151
Unrealized gains (losses) still held (2) 56
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 2 4
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 (2) (2)
Settlements 0 0
Balance at end of period 0 2
Unrealized gains (losses) still held 0 0
Investments | State and municipal securities    
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation    
Balance at beginning of period 1,211 2,192
Net realized/unrealized gains (losses) included in principal transactions 0 0
Net realized/unrealized gains (losses) included in Other 58 39
Transfers into Level 3 70 467
Transfers out of Level 3 (517) (1,598)
Purchases 127 351
Issuance 0 0
Sales (212) (240)
Settlements 0 0
Balance at end of period 737 1,211
Unrealized gains (losses) still held 44 23
Investments | Foreign government    
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation    
Balance at beginning of period 186 260
Net realized/unrealized gains (losses) included in principal transactions 0 0
Net realized/unrealized gains (losses) included in Other 0 10
Transfers into Level 3 2 38
Transfers out of Level 3 (284) (39)
Purchases 523 259
Issuance 0 0
Sales (335) (339)
Settlements 0 (3)
Balance at end of period 92 186
Unrealized gains (losses) still held 1 (104)
Investments | Corporate    
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation    
Balance at beginning of period 311 603
Net realized/unrealized gains (losses) included in principal transactions 0 0
Net realized/unrealized gains (losses) included in Other 9 77
Transfers into Level 3 77 11
Transfers out of Level 3 (47) (240)
Purchases 227 693
Issuance 0 0
Sales (506) (468)
Settlements 0 (365)
Balance at end of period 71 311
Unrealized gains (losses) still held 0 0
Investments | Equity securities    
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation    
Balance at beginning of period 9 124
Net realized/unrealized gains (losses) included in principal transactions 0 0
Net realized/unrealized gains (losses) included in Other (1) 10
Transfers into Level 3 0 5
Transfers out of Level 3 0 (5)
Purchases 0 1
Issuance 0 0
Sales (6) (131)
Settlements 0 5
Balance at end of period 2 9
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 660 596
Net realized/unrealized gains (losses) included in principal transactions 0 0
Net realized/unrealized gains (losses) included in Other (89) (92)
Transfers into Level 3 31 7
Transfers out of Level 3 (32) (61)
Purchases 883 435
Issuance 0 0
Sales (626) (306)
Settlements 0 81
Balance at end of period 827 660
Unrealized gains (losses) still held 12 (102)
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 10
Transfers out of Level 3 0 0
Purchases 21 6
Issuance 0 0
Sales (21) (16)
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 1,331 1,135
Net realized/unrealized gains (losses) included in principal transactions 0 0
Net realized/unrealized gains (losses) included in Other (170) 79
Transfers into Level 3 2 336
Transfers out of Level 3 0 (32)
Purchases 19 26
Issuance 0 0
Sales (233) (14)
Settlements (268) (199)
Balance at end of period 681 1,331
Unrealized gains (losses) still held 44 18
Loans    
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation    
Balance at beginning of period 568 2,166
Net realized/unrealized gains (losses) included in principal transactions 0 0
Net realized/unrealized gains (losses) included in Other 75 (61)
Transfers into Level 3 80 89
Transfers out of Level 3 (16) (1,074)
Purchases 188 708
Issuance 0 219
Sales (337) (813)
Settlements (8) (666)
Balance at end of period 550 568
Unrealized gains (losses) still held 211 26
Mortgage servicing rights    
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation    
Balance at beginning of period 1,564 1,781
Net realized/unrealized gains (losses) included in principal transactions 0 0
Net realized/unrealized gains (losses) included in Other 65 (36)
Transfers into Level 3 0 0
Transfers out of Level 3 0 0
Purchases 0 0
Issuance 96 152
Sales (1,057) (20)
Settlements (110) (313)
Balance at end of period 558 1,564
Unrealized gains (losses) still held 74 (21)
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 34 180
Net realized/unrealized gains (losses) included in principal transactions 0 0
Net realized/unrealized gains (losses) included in Other (128) 80
Transfers into Level 3 10 55
Transfers out of Level 3 (8) (47)
Purchases 1 1
Issuance 318 236
Sales (14) (133)
Settlements (197) (338)
Balance at end of period 16 34
Unrealized gains (losses) still held $ (152) $ 39