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FAIR VALUE MEASUREMENT - Level 3 Fair Value Rollforward (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
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 $ (901) $ (4,979)
Net realized/unrealized gains (losses) included in principal transactions (324) 88
Transfers into Level 3 (205) (99)
Transfers out of Level 3 293 523
Purchases 62 43
Issuances (47) 0
Sales (36) (22)
Settlements 81 19
Balance at end of period, asset (liability), net (1,077) (4,427)
Unrealized gains (losses) still held (274) (338)
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 (154) (422)
Net realized/unrealized gains (losses) included in principal transactions (51) 381
Transfers into Level 3 (15) 5
Transfers out of Level 3 27 37
Purchases 6 7
Issuances 12 0
Sales 0 (16)
Settlements 59 2
Balance at end of period, asset (liability), net (116) (6)
Unrealized gains (losses) still held (60) (94)
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 (6) 130
Net realized/unrealized gains (losses) included in principal transactions 60 (62)
Transfers into Level 3 (15) (1)
Transfers out of Level 3 15 8
Purchases 3 1
Issuances 0 0
Sales (4) 0
Settlements (7) 12
Balance at end of period, asset (liability), net 46 88
Unrealized gains (losses) still held 28 (155)
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 (784) (2,027)
Net realized/unrealized gains (losses) included in principal transactions (294) (136)
Transfers into Level 3 (154) (57)
Transfers out of Level 3 9 472
Purchases (1) 13
Issuances (59) 0
Sales 2 (7)
Settlements (64) 1
Balance at end of period, asset (liability), net (1,345) (1,741)
Unrealized gains (losses) still held (222) 156
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 (18) (1,861)
Net realized/unrealized gains (losses) included in principal transactions 280 (33)
Transfers into Level 3 (3) (47)
Transfers out of Level 3 10 8
Purchases 54 20
Issuances 0 0
Sales (34) 0
Settlements 15 4
Balance at end of period, asset (liability), net 304 (1,909)
Unrealized gains (losses) still held 300 (42)
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 61 (799)
Net realized/unrealized gains (losses) included in principal transactions (319) (62)
Transfers into Level 3 (18) 1
Transfers out of Level 3 232 (2)
Purchases 0 2
Issuances 0 0
Sales 0 1
Settlements 78 0
Balance at end of period, asset (liability), net 34 (859)
Unrealized gains (losses) still held (320) (203)
Interest-bearing deposits    
Fair value, liabilities measured on recurring basis, level 3 fair-value category reconciliation    
Balance at beginning of period, liability 495 286
Net realized/unrealized gains (losses) included in principal transactions, liabilities 0 0
Net realized/unrealized gains (losses) included in locations other than principal transactions, liabilities (10) 26
Transfers into Level 3, liabilities 1 12
Transfers out of Level 3, liabilities (4) 0
Purchases, liability 0 0
Issuance, liability 674 20
Sales, liability 0 0
Settlements, liability (129) 0
Balance at end of period, liability 1,047 292
Unrealized gains (losses) still held, liabilities (157) 29
Federal funds purchased and securities loaned and sold under agreement to repurchase    
Fair value, liabilities measured on recurring basis, level 3 fair-value category reconciliation    
Balance at beginning of period, liability 983 726
Net realized/unrealized gains (losses) included in principal transactions, liabilities 4 14
Net realized/unrealized gains (losses) included in locations other than principal transactions, liabilities 0 0
Transfers into Level 3, liabilities (1) 0
Transfers out of Level 3, liabilities 4 0
Purchases, liability 0 0
Issuance, liability 0 147
Sales, liability 1 0
Settlements, liability 58 (2)
Balance at end of period, liability 1,041 857
Unrealized gains (losses) still held, liabilities (2) 14
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, liability 586 22
Net realized/unrealized gains (losses) included in principal transactions, liabilities 124 (105)
Net realized/unrealized gains (losses) included in locations other than principal transactions, liabilities 0 0
Transfers into Level 3, liabilities 1 3
Transfers out of Level 3, liabilities (441) (19)
Purchases, liability 0 0
Issuance, liability 0 0
Sales, liability 0 3
Settlements, liability (7) (66)
Balance at end of period, liability 15 48
Unrealized gains (losses) still held, liabilities 13 (7)
Trading account liabilities | Other trading liabilities    
Fair value, liabilities measured on recurring basis, level 3 fair-value category reconciliation    
Balance at beginning of period, liability 0 5
Net realized/unrealized gains (losses) included in principal transactions, liabilities 0 5
Net realized/unrealized gains (losses) included in locations other than principal transactions, liabilities 0 0
Transfers into Level 3, liabilities 0 0
Transfers out of Level 3, liabilities 0 0
Purchases, liability 0 0
Issuance, liability 0 0
Sales, liability 0 0
Settlements, liability 0 0
Balance at end of period, liability 0 0
Unrealized gains (losses) still held, liabilities 0 (5)
Short-term borrowings    
Fair value, liabilities measured on recurring basis, level 3 fair-value category reconciliation    
Balance at beginning of period, liability 37 18
Net realized/unrealized gains (losses) included in principal transactions, liabilities 23 7
Net realized/unrealized gains (losses) included in locations other than principal transactions, liabilities 0 0
Transfers into Level 3, liabilities 9 45
Transfers out of Level 3, liabilities (6) 0
Purchases, liability 0 0
Issuance, liability 153 25
Sales, liability 0 0
Settlements, liability 0 0
Balance at end of period, liability 170 81
Unrealized gains (losses) still held, liabilities 18 (2)
Long-term debt    
Fair value, liabilities measured on recurring basis, level 3 fair-value category reconciliation    
Balance at beginning of period, liability 12,570 13,082
Net realized/unrealized gains (losses) included in principal transactions, liabilities (407) (236)
Net realized/unrealized gains (losses) included in locations other than principal transactions, liabilities 0 0
Transfers into Level 3, liabilities 877 940
Transfers out of Level 3, liabilities (1,601) (764)
Purchases, liability 0 36
Issuance, liability 5,950 3
Sales, liability (3) (44)
Settlements, liability (4,466) (5)
Balance at end of period, liability 13,734 13,484
Unrealized gains (losses) still held, liabilities (1,001) 254
Other financial liabilities    
Fair value, liabilities measured on recurring basis, level 3 fair-value category reconciliation    
Balance at beginning of period, liability 0 8
Net realized/unrealized gains (losses) included in principal transactions, liabilities 0 0
Net realized/unrealized gains (losses) included in locations other than principal transactions, liabilities 0 0
Transfers into Level 3, liabilities 0 0
Transfers out of Level 3, liabilities 0 (5)
Purchases, liability 0 0
Issuance, liability 0 2
Sales, liability 0 0
Settlements, liability 0 (2)
Balance at end of period, liability 0 3
Unrealized gains (losses) still held, liabilities 0 (1)
Federal funds sold and 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, asset 115 16
Net realized/unrealized gains (losses) included in principal transactions (4) 18
Net realized/unrealized gains (losses) included in locations other than principal transactions, assets 0 0
Transfers into Level 3 (4) 0
Transfers out of Level 3, assets 3 0
Purchases, assets 45 0
Issuance, assets 0 0
Sales, assets 0 0
Settlements, assets (89) (18)
Balance at end of period, asset 66 16
Unrealized gains (losses) still held, assets (2) 3
Trading non-derivative assets    
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation    
Balance at beginning of period, asset 3,548 3,274
Net realized/unrealized gains (losses) included in principal transactions 60 341
Net realized/unrealized gains (losses) included in locations other than principal transactions, assets 0 0
Transfers into Level 3 58 253
Transfers out of Level 3, assets (177) (317)
Purchases, assets 784 821
Issuance, assets (29) 0
Sales, assets (695) (954)
Settlements, assets (5) (5)
Balance at end of period, asset 3,544 3,418
Unrealized gains (losses) still held, assets 12 165
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, asset 156 163
Net realized/unrealized gains (losses) included in principal transactions 0 1
Net realized/unrealized gains (losses) included in locations other than principal transactions, assets 0 0
Transfers into Level 3 0 86
Transfers out of Level 3, assets (25) (49)
Purchases, assets 48 116
Issuance, assets 0 0
Sales, assets (25) (111)
Settlements, assets 0 0
Balance at end of period, asset 154 206
Unrealized gains (losses) still held, assets 3 0
Trading non-derivative assets | Residential mortgage    
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation    
Balance at beginning of period, asset 268 164
Net realized/unrealized gains (losses) included in principal transactions 1 22
Net realized/unrealized gains (losses) included in locations other than principal transactions, assets 0 0
Transfers into Level 3 5 35
Transfers out of Level 3, assets (31) (77)
Purchases, assets 69 46
Issuance, assets 0 0
Sales, assets (184) (47)
Settlements, assets 0 0
Balance at end of period, asset 128 143
Unrealized gains (losses) still held, assets 10 3
Trading non-derivative assets | Commercial and other    
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation    
Balance at beginning of period, asset 77 57
Net realized/unrealized gains (losses) included in principal transactions 2 1
Net realized/unrealized gains (losses) included in locations other than principal transactions, assets 0 0
Transfers into Level 3 2 4
Transfers out of Level 3, assets (1) (35)
Purchases, assets 24 15
Issuance, assets 0 0
Sales, assets (35) (7)
Settlements, assets 0 0
Balance at end of period, asset 69 35
Unrealized gains (losses) still held, assets 1 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, asset 501 384
Net realized/unrealized gains (losses) included in principal transactions 3 24
Net realized/unrealized gains (losses) included in locations other than principal transactions, assets 0 0
Transfers into Level 3 7 125
Transfers out of Level 3, assets (57) (161)
Purchases, assets 141 177
Issuance, assets 0 0
Sales, assets (244) (165)
Settlements, assets 0 0
Balance at end of period, asset 351 384
Unrealized gains (losses) still held, assets 14 6
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, asset 1 0
Net realized/unrealized gains (losses) included in principal transactions 0 0
Net realized/unrealized gains (losses) included in locations other than principal transactions, assets 0 0
Transfers into Level 3 0 0
Transfers out of Level 3, assets 0 0
Purchases, assets 0 0
Issuance, assets 0 0
Sales, assets 0 0
Settlements, assets (1) 0
Balance at end of period, asset 0 0
Unrealized gains (losses) still held, assets 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, asset 200 274
Net realized/unrealized gains (losses) included in principal transactions (1) 6
Net realized/unrealized gains (losses) included in locations other than principal transactions, assets 0 0
Transfers into Level 3 0 0
Transfers out of Level 3, assets (19) (44)
Purchases, assets 1 0
Issuance, assets 0 0
Sales, assets (3) (25)
Settlements, assets 0 0
Balance at end of period, asset 178 211
Unrealized gains (losses) still held, assets 0 (1)
Trading non-derivative assets | Foreign government    
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation    
Balance at beginning of period, asset 31 16
Net realized/unrealized gains (losses) included in principal transactions (1) 0
Net realized/unrealized gains (losses) included in locations other than principal transactions, assets 0 0
Transfers into Level 3 9 2
Transfers out of Level 3, assets 0 0
Purchases, assets 3 14
Issuance, assets 0 0
Sales, assets (3) (11)
Settlements, assets 0 0
Balance at end of period, asset 39 21
Unrealized gains (losses) still held, assets 1 0
Trading non-derivative assets | Corporate    
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation    
Balance at beginning of period, asset 360 275
Net realized/unrealized gains (losses) included in principal transactions 90 43
Net realized/unrealized gains (losses) included in locations other than principal transactions, assets 0 0
Transfers into Level 3 21 49
Transfers out of Level 3, assets (26) (72)
Purchases, assets 69 34
Issuance, assets (33) 0
Sales, assets (103) (77)
Settlements, assets 0 0
Balance at end of period, asset 378 252
Unrealized gains (losses) still held, assets (35) 84
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, asset 153 120
Net realized/unrealized gains (losses) included in principal transactions (10) 75
Net realized/unrealized gains (losses) included in locations other than principal transactions, assets 0 0
Transfers into Level 3 1 1
Transfers out of Level 3, assets (11) (15)
Purchases, assets 9 168
Issuance, assets 0 0
Sales, assets (15) (112)
Settlements, assets 0 0
Balance at end of period, asset 127 237
Unrealized gains (losses) still held, assets 14 (3)
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, asset 1,484 1,590
Net realized/unrealized gains (losses) included in principal transactions (26) 58
Net realized/unrealized gains (losses) included in locations other than principal transactions, assets 0 0
Transfers into Level 3 7 18
Transfers out of Level 3, assets (32) (15)
Purchases, assets 221 316
Issuance, assets 0 0
Sales, assets (225) (370)
Settlements, assets 0 0
Balance at end of period, asset 1,429 1,597
Unrealized gains (losses) still held, assets 38 73
Trading non-derivative assets | Other    
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation    
Balance at beginning of period, asset 818 615
Net realized/unrealized gains (losses) included in principal transactions 5 135
Net realized/unrealized gains (losses) included in locations other than principal transactions, assets 0 0
Transfers into Level 3 13 58
Transfers out of Level 3, assets (32) (10)
Purchases, assets 340 112
Issuance, assets 4 0
Sales, assets (102) (194)
Settlements, assets (4) (5)
Balance at end of period, asset 1,042 716
Unrealized gains (losses) still held, assets (20) 6
Investments    
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation    
Balance at beginning of period, asset 1,737 2,437
Net realized/unrealized gains (losses) included in principal transactions 0 0
Net realized/unrealized gains (losses) included in locations other than principal transactions, assets 68 17
Transfers into Level 3 97 35
Transfers out of Level 3, assets (94) (353)
Purchases, assets 778 104
Issuance, assets 0 0
Sales, assets (181) (136)
Settlements, assets (21) (16)
Balance at end of period, asset 2,384 2,088
Unrealized gains (losses) still held, assets 26 (2)
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, asset 32 24
Net realized/unrealized gains (losses) included in principal transactions 0 0
Net realized/unrealized gains (losses) included in locations other than principal transactions, assets 0 (1)
Transfers into Level 3 0 0
Transfers out of Level 3, assets 0 0
Purchases, assets 0 0
Issuance, assets 0 0
Sales, assets 0 0
Settlements, assets 0 0
Balance at end of period, asset 32 23
Unrealized gains (losses) still held, assets (2) 2
Investments | Residential mortgage    
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation    
Balance at beginning of period, asset 0 0
Net realized/unrealized gains (losses) included in principal transactions 0 0
Net realized/unrealized gains (losses) included in locations other than principal transactions, assets 0 0
Transfers into Level 3 0 0
Transfers out of Level 3, assets 0 0
Purchases, assets 0 0
Issuance, assets 0 0
Sales, assets 0 0
Settlements, assets 0 0
Balance at end of period, asset 0 0
Unrealized gains (losses) still held, assets 0 0
Investments | Commercial and other    
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation    
Balance at beginning of period, asset 0 3
Net realized/unrealized gains (losses) included in principal transactions 0 0
Net realized/unrealized gains (losses) included in locations other than principal transactions, assets 0 2
Transfers into Level 3 0 0
Transfers out of Level 3, assets 0 0
Purchases, assets 0 0
Issuance, assets 0 0
Sales, assets 0 0
Settlements, assets 0 0
Balance at end of period, asset 0 5
Unrealized gains (losses) still held, assets 0 0
Investments | Mortgage-backed securities    
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation    
Balance at beginning of period, asset 32 27
Net realized/unrealized gains (losses) included in principal transactions 0 0
Net realized/unrealized gains (losses) included in locations other than principal transactions, assets 0 1
Transfers into Level 3 0 0
Transfers out of Level 3, assets 0 0
Purchases, assets 0 0
Issuance, assets 0 0
Sales, assets 0 0
Settlements, assets 0 0
Balance at end of period, asset 32 28
Unrealized gains (losses) still held, assets (2) 2
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, asset 0 0
Net realized/unrealized gains (losses) included in principal transactions 0 0
Net realized/unrealized gains (losses) included in locations other than principal transactions, assets 0 0
Transfers into Level 3 0 0
Transfers out of Level 3, assets 0 0
Purchases, assets 0 0
Issuance, assets 0 0
Sales, assets 0 0
Settlements, assets 0 0
Balance at end of period, asset 0 0
Unrealized gains (losses) still held, assets 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, asset 708 737
Net realized/unrealized gains (losses) included in principal transactions 0 0
Net realized/unrealized gains (losses) included in locations other than principal transactions, assets 52 (16)
Transfers into Level 3 3 0
Transfers out of Level 3, assets 0 (9)
Purchases, assets 185 29
Issuance, assets 0 0
Sales, assets (38) (59)
Settlements, assets 0 0
Balance at end of period, asset 910 682
Unrealized gains (losses) still held, assets 44 (33)
Investments | Foreign government    
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation    
Balance at beginning of period, asset 68 92
Net realized/unrealized gains (losses) included in principal transactions 0 0
Net realized/unrealized gains (losses) included in locations other than principal transactions, assets (4) (1)
Transfers into Level 3 0 0
Transfers out of Level 3, assets 0 (2)
Purchases, assets 39 57
Issuance, assets 0 0
Sales, assets (32) (76)
Settlements, assets 0 0
Balance at end of period, asset 71 70
Unrealized gains (losses) still held, assets (1) 0
Investments | Corporate    
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation    
Balance at beginning of period, asset 156 71
Net realized/unrealized gains (losses) included in principal transactions 0 0
Net realized/unrealized gains (losses) included in locations other than principal transactions, assets 0 (1)
Transfers into Level 3 0 3
Transfers out of Level 3, assets (94) 0
Purchases, assets 0 3
Issuance, assets 0 0
Sales, assets (2) 0
Settlements, assets 0 0
Balance at end of period, asset 60 76
Unrealized gains (losses) still held, assets 0 0
Investments | Marketable equity securities    
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation    
Balance at beginning of period, asset 0 2
Net realized/unrealized gains (losses) included in principal transactions 0 0
Net realized/unrealized gains (losses) included in locations other than principal transactions, assets 0 0
Transfers into Level 3 0 0
Transfers out of Level 3, assets 0 0
Purchases, assets 0 0
Issuance, assets 0 0
Sales, assets 0 (1)
Settlements, assets 0 0
Balance at end of period, asset 0 1
Unrealized gains (losses) still held, assets 0 0
Investments | Asset-backed securities    
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation    
Balance at beginning of period, asset 187 827
Net realized/unrealized gains (losses) included in principal transactions 0 0
Net realized/unrealized gains (losses) included in locations other than principal transactions, assets (2) 10
Transfers into Level 3 94 2
Transfers out of Level 3, assets 0 (342)
Purchases, assets 550 0
Issuance, assets 0 0
Sales, assets (23) 0
Settlements, assets 0 0
Balance at end of period, asset 806 497
Unrealized gains (losses) still held, assets (4) 7
Investments | Other    
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation    
Balance at beginning of period, asset 0 0
Net realized/unrealized gains (losses) included in principal transactions 0 0
Net realized/unrealized gains (losses) included in locations other than principal transactions, assets 0 0
Transfers into Level 3 0 0
Transfers out of Level 3, assets 0 0
Purchases, assets 0 0
Issuance, assets 0 0
Sales, assets 0 0
Settlements, assets 0 0
Balance at end of period, asset 0 0
Unrealized gains (losses) still held, assets 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, asset 586 681
Net realized/unrealized gains (losses) included in principal transactions 0 0
Net realized/unrealized gains (losses) included in locations other than principal transactions, assets 22 24
Transfers into Level 3 0 30
Transfers out of Level 3, assets 0 0
Purchases, assets 4 15
Issuance, assets 0 0
Sales, assets (86) 0
Settlements, assets (21) (16)
Balance at end of period, asset 505 734
Unrealized gains (losses) still held, assets (11) 22
Loans    
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation    
Balance at beginning of period, asset 277 550
Net realized/unrealized gains (losses) included in principal transactions 0 0
Net realized/unrealized gains (losses) included in locations other than principal transactions, assets 45 19
Transfers into Level 3 125 0
Transfers out of Level 3, assets (70) (1)
Purchases, assets 6 4
Issuance, assets 0 0
Sales, assets (10) (16)
Settlements, assets 0 (2)
Balance at end of period, asset 373 554
Unrealized gains (losses) still held, assets 45 26
Mortgage servicing rights    
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation    
Balance at beginning of period, asset 584 558
Net realized/unrealized gains (losses) included in principal transactions 0 0
Net realized/unrealized gains (losses) included in locations other than principal transactions, assets (27) 46
Transfers into Level 3 0 0
Transfers out of Level 3, assets 0 0
Purchases, assets 0 0
Issuance, assets 12 17
Sales, assets 0 (17)
Settlements, assets (18) (17)
Balance at end of period, asset 551 587
Unrealized gains (losses) still held, assets (25) 46
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, asset 0 16
Net realized/unrealized gains (losses) included in principal transactions 0 0
Net realized/unrealized gains (losses) included in locations other than principal transactions, assets 16 8
Transfers into Level 3 0 0
Transfers out of Level 3, assets 0 0
Purchases, assets 0 4
Issuance, assets (2) 12
Sales, assets (4) 0
Settlements, assets (10) (27)
Balance at end of period, asset 0 13
Unrealized gains (losses) still held, assets $ 12 $ 18