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FAIR VALUE MEASUREMENT - Level 3 Fair Value Rollforward (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
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 $ (4,979) $ (4,753)
Net realized/unrealized gains (losses) included in principal transactions 88 (696)
Transfers into Level 3 (99) 39
Transfers out of Level 3 523 (27)
Purchases 43 125
Issuances 0 0
Sales (22) (169)
Settlements 19 35
Balance at end of period, asset (liability), net (4,427) (5,446)
Unrealized gains (losses) still held (338) (440)
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 (422) (663)
Net realized/unrealized gains (losses) included in principal transactions 381 (37)
Transfers into Level 3 5 (38)
Transfers out of Level 3 37 19
Purchases 7 6
Issuances 0 0
Sales (16) (113)
Settlements 2 53
Balance at end of period, asset (liability), net (6) (773)
Unrealized gains (losses) still held (94) (23)
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 130 413
Net realized/unrealized gains (losses) included in principal transactions (62) (390)
Transfers into Level 3 (1) 55
Transfers out of Level 3 8 (20)
Purchases 1 34
Issuances 0 0
Sales 0 (32)
Settlements 12 (12)
Balance at end of period, asset (liability), net 88 48
Unrealized gains (losses) still held (155) (341)
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 (2,027) (1,557)
Net realized/unrealized gains (losses) included in principal transactions (136) (2)
Transfers into Level 3 (57) 0
Transfers out of Level 3 472 (16)
Purchases 13 85
Issuances 0 0
Sales (7) (24)
Settlements 1 (10)
Balance at end of period, asset (liability), net (1,741) (1,524)
Unrealized gains (losses) still held 156 202
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 (1,861) (1,945)
Net realized/unrealized gains (losses) included in principal transactions (33) (175)
Transfers into Level 3 (47) 46
Transfers out of Level 3 8 (2)
Purchases 20 0
Issuances 0 0
Sales 0 0
Settlements 4 2
Balance at end of period, asset (liability), net (1,909) (2,074)
Unrealized gains (losses) still held (42) (170)
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 (799) (1,001)
Net realized/unrealized gains (losses) included in principal transactions (62) (92)
Transfers into Level 3 1 (24)
Transfers out of Level 3 (2) (8)
Purchases 2 0
Issuances 0 0
Sales 1 0
Settlements 0 2
Balance at end of period, asset (liability), net (859) (1,123)
Unrealized gains (losses) still held (203) (108)
Interest-bearing deposits    
Fair value, liabilities measured on recurring basis, level 3 fair-value category reconciliation    
Balance at beginning of period, liability 286 293
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 26 11
Transfers into Level 3, liabilities 12 20
Transfers out of Level 3, liabilities 0 0
Purchases, liability 0 0
Issuance, liability 20 0
Sales, liability 0 0
Settlements, liability 0 0
Balance at end of period, liability 292 302
Unrealized gains (losses) still held, liabilities 29 25
Federal funds purchased and securities loaned or sold under agreement to repurchase    
Fair value, liabilities measured on recurring basis, level 3 fair-value category reconciliation    
Balance at beginning of period, liability 726 849
Net realized/unrealized gains (losses) included in principal transactions, liabilities 14 6
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 147 0
Sales, liability 0 0
Settlements, liability (2) (34)
Balance at end of period, liability 857 809
Unrealized gains (losses) still held, liabilities 14 6
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 22 1,177
Net realized/unrealized gains (losses) included in principal transactions, liabilities (105) 54
Net realized/unrealized gains (losses) included in locations other than principal transactions, liabilities 0 0
Transfers into Level 3, liabilities 3 11
Transfers out of Level 3, liabilities (19) (14)
Purchases, liability 0 0
Issuance, liability 0 0
Sales, liability 3 101
Settlements, liability (66) (70)
Balance at end of period, liability 48 1,151
Unrealized gains (losses) still held, liabilities (7) 2
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 5 1
Net realized/unrealized gains (losses) included in principal transactions, liabilities 5 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 0
Purchases, liability 0 0
Issuance, liability 0 0
Sales, liability 0 0
Settlements, liability 0 (1)
Balance at end of period, liability 0 0
Unrealized gains (losses) still held, liabilities (5) 0
Short-term borrowings    
Fair value, liabilities measured on recurring basis, level 3 fair-value category reconciliation    
Balance at beginning of period, liability 18 42
Net realized/unrealized gains (losses) included in principal transactions, liabilities 7 (9)
Net realized/unrealized gains (losses) included in locations other than principal transactions, liabilities 0 0
Transfers into Level 3, liabilities 45 0
Transfers out of Level 3, liabilities 0 0
Purchases, liability 0 0
Issuance, liability 25 11
Sales, liability 0 0
Settlements, liability 0 (2)
Balance at end of period, liability 81 60
Unrealized gains (losses) still held, liabilities (2) 22
Long-term debt    
Fair value, liabilities measured on recurring basis, level 3 fair-value category reconciliation    
Balance at beginning of period, liability 13,082 9,744
Net realized/unrealized gains (losses) included in principal transactions, liabilities (236) 17
Net realized/unrealized gains (losses) included in locations other than principal transactions, liabilities 0 0
Transfers into Level 3, liabilities 940 200
Transfers out of Level 3, liabilities (764) (409)
Purchases, liability 36 0
Issuance, liability 3 929
Sales, liability (44) 0
Settlements, liability (5) (271)
Balance at end of period, liability 13,484 10,176
Unrealized gains (losses) still held, liabilities 254 116
Other financial liabilities    
Fair value, liabilities measured on recurring basis, level 3 fair-value category reconciliation    
Balance at beginning of period, liability 8 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 (2)
Transfers into Level 3, liabilities 0 0
Transfers out of Level 3, liabilities (5) 0
Purchases, liability 0 (1)
Issuance, liability 2 1
Sales, liability 0 0
Settlements, liability (2) (6)
Balance at end of period, liability 3 4
Unrealized gains (losses) still held, liabilities (1) (2)
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, asset 16 1,496
Net realized/unrealized gains (losses) included in principal transactions 18 (56)
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 (252)
Purchases, assets 0 0
Issuance, assets 0 0
Sales, assets 0 0
Settlements, assets (18) (1)
Balance at end of period, asset 16 1,187
Unrealized gains (losses) still held, assets 3 4
Trading non-derivative assets    
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation    
Balance at beginning of period, asset 3,274 6,251
Net realized/unrealized gains (losses) included in principal transactions 341 277
Net realized/unrealized gains (losses) included in locations other than principal transactions, assets 0 0
Transfers into Level 3 253 423
Transfers out of Level 3, assets (317) (730)
Purchases, assets 821 1,329
Issuance, assets 5 1
Sales, assets (954) (1,988)
Settlements, assets (5) (26)
Balance at end of period, asset 3,418 5,537
Unrealized gains (losses) still held, assets 165 54
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 163 176
Net realized/unrealized gains (losses) included in principal transactions 1 5
Net realized/unrealized gains (losses) included in locations other than principal transactions, assets 0 0
Transfers into Level 3 86 50
Transfers out of Level 3, assets (49) (17)
Purchases, assets 116 161
Issuance, assets 0 0
Sales, assets (111) (104)
Settlements, assets 0 0
Balance at end of period, asset 206 271
Unrealized gains (losses) still held, assets 0 0
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, asset 164 399
Net realized/unrealized gains (losses) included in principal transactions 22 15
Net realized/unrealized gains (losses) included in locations other than principal transactions, assets 0 0
Transfers into Level 3 35 17
Transfers out of Level 3, assets (77) (29)
Purchases, assets 46 50
Issuance, assets 0 0
Sales, assets (47) (84)
Settlements, assets 0 0
Balance at end of period, asset 143 368
Unrealized gains (losses) still held, assets 3 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, asset 57 206
Net realized/unrealized gains (losses) included in principal transactions 1 (8)
Net realized/unrealized gains (losses) included in locations other than principal transactions, assets 0 0
Transfers into Level 3 4 17
Transfers out of Level 3, assets (35) (13)
Purchases, assets 15 190
Issuance, assets 0 0
Sales, assets (7) (126)
Settlements, assets 0 0
Balance at end of period, asset 35 266
Unrealized gains (losses) still held, assets 3 (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, asset 384 781
Net realized/unrealized gains (losses) included in principal transactions 24 12
Net realized/unrealized gains (losses) included in locations other than principal transactions, assets 0 0
Transfers into Level 3 125 84
Transfers out of Level 3, assets (161) (59)
Purchases, assets 177 401
Issuance, assets 0 0
Sales, assets (165) (314)
Settlements, assets 0 0
Balance at end of period, asset 384 905
Unrealized gains (losses) still held, assets 6 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 0 1
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 1
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 274 296
Net realized/unrealized gains (losses) included in principal transactions 6 2
Net realized/unrealized gains (losses) included in locations other than principal transactions, assets 0 0
Transfers into Level 3 0 2
Transfers out of Level 3, assets (44) (47)
Purchases, assets 0 81
Issuance, assets 0 0
Sales, assets (25) (64)
Settlements, assets 0 0
Balance at end of period, asset 211 270
Unrealized gains (losses) still held, assets (1) 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, asset 16 40
Net realized/unrealized gains (losses) included in principal transactions 0 4
Net realized/unrealized gains (losses) included in locations other than principal transactions, assets 0 0
Transfers into Level 3 2 78
Transfers out of Level 3, assets 0 (13)
Purchases, assets 14 44
Issuance, assets 0 0
Sales, assets (11) (27)
Settlements, assets 0 0
Balance at end of period, asset 21 126
Unrealized gains (losses) still held, assets 0 6
Trading non-derivative assets | Corporate    
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation    
Balance at beginning of period, asset 275 324
Net realized/unrealized gains (losses) included in principal transactions 43 91
Net realized/unrealized gains (losses) included in locations other than principal transactions, assets 0 0
Transfers into Level 3 49 27
Transfers out of Level 3, assets (72) (52)
Purchases, assets 34 118
Issuance, assets 0 0
Sales, assets (77) (197)
Settlements, assets 0 (15)
Balance at end of period, asset 252 296
Unrealized gains (losses) still held, assets 84 12
Trading non-derivative assets | Equity securities    
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation    
Balance at beginning of period, asset 120 127
Net realized/unrealized gains (losses) included in principal transactions 75 15
Net realized/unrealized gains (losses) included in locations other than principal transactions, assets 0 0
Transfers into Level 3 1 2
Transfers out of Level 3, assets (15) (12)
Purchases, assets 168 7
Issuance, assets 0 0
Sales, assets (112) (29)
Settlements, assets 0 0
Balance at end of period, asset 237 110
Unrealized gains (losses) still held, assets (3) 2
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 1,590 1,868
Net realized/unrealized gains (losses) included in principal transactions 58 160
Net realized/unrealized gains (losses) included in locations other than principal transactions, assets 0 0
Transfers into Level 3 18 20
Transfers out of Level 3, assets (15) (16)
Purchases, assets 316 391
Issuance, assets 0 0
Sales, assets (370) (482)
Settlements, assets 0 0
Balance at end of period, asset 1,597 1,941
Unrealized gains (losses) still held, assets 73 81
Trading non-derivative assets | Other    
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation    
Balance at beginning of period, asset 615 2,814
Net realized/unrealized gains (losses) included in principal transactions 135 (7)
Net realized/unrealized gains (losses) included in locations other than principal transactions, assets 0 0
Transfers into Level 3 58 210
Transfers out of Level 3, assets (10) (531)
Purchases, assets 112 287
Issuance, assets 5 1
Sales, assets (194) (875)
Settlements, assets (5) (11)
Balance at end of period, asset 716 1,888
Unrealized gains (losses) still held, assets 6 (55)
Investments    
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation    
Balance at beginning of period, asset 2,437 3,861
Net realized/unrealized gains (losses) included in principal transactions 0 0
Net realized/unrealized gains (losses) included in locations other than principal transactions, assets 17 (66)
Transfers into Level 3 35 116
Transfers out of Level 3, assets (353) (148)
Purchases, assets 104 340
Issuance, assets 0 0
Sales, assets (136) (347)
Settlements, assets (16) (90)
Balance at end of period, asset 2,088 3,666
Unrealized gains (losses) still held, assets (2) 12
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 24 101
Net realized/unrealized gains (losses) included in principal transactions 0 0
Net realized/unrealized gains (losses) included in locations other than principal transactions, assets (1) 2
Transfers into Level 3 0 1
Transfers out of Level 3, assets 0 (49)
Purchases, assets 0 0
Issuance, assets 0 0
Sales, assets 0 0
Settlements, assets 0 0
Balance at end of period, asset 23 55
Unrealized gains (losses) still held, assets 2 2
Investments | Mortgage-backed securities - Residential    
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation    
Balance at beginning of period, asset 0 50
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 (47)
Purchases, assets 0 0
Issuance, assets 0 0
Sales, assets 0 (5)
Settlements, assets 0 0
Balance at end of period, asset 0 0
Unrealized gains (losses) still held, assets 0 0
Investments | Mortgage-backed securities - Commercial    
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation    
Balance at beginning of period, asset 3 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 2 0
Transfers into Level 3 0 0
Transfers out of Level 3, assets 0 0
Purchases, assets 0 8
Issuance, assets 0 0
Sales, assets 0 (8)
Settlements, assets 0 0
Balance at end of period, asset 5 0
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 27 151
Net realized/unrealized gains (losses) included in principal transactions 0 0
Net realized/unrealized gains (losses) included in locations other than principal transactions, assets 1 4
Transfers into Level 3 0 1
Transfers out of Level 3, assets 0 (96)
Purchases, assets 0 8
Issuance, assets 0 0
Sales, assets 0 (13)
Settlements, assets 0 0
Balance at end of period, asset 28 55
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 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 | State and municipal securities    
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation    
Balance at beginning of period, asset 737 1,211
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) 12
Transfers into Level 3 0 37
Transfers out of Level 3, assets (9) (30)
Purchases, assets 29 54
Issuance, assets 0 0
Sales, assets (59) (51)
Settlements, assets 0 0
Balance at end of period, asset 682 1,233
Unrealized gains (losses) still held, assets (33) 6
Investments | Foreign government    
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation    
Balance at beginning of period, asset 92 186
Net realized/unrealized gains (losses) included in principal transactions 0 0
Net realized/unrealized gains (losses) included in locations other than principal transactions, assets (1) 1
Transfers into Level 3 0 2
Transfers out of Level 3, assets (2) (18)
Purchases, assets 57 142
Issuance, assets 0 0
Sales, assets (76) (78)
Settlements, assets 0 0
Balance at end of period, asset 70 235
Unrealized gains (losses) still held, assets 0 1
Investments | Corporate    
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation    
Balance at beginning of period, asset 71 311
Net realized/unrealized gains (losses) included in principal transactions 0 0
Net realized/unrealized gains (losses) included in locations other than principal transactions, assets (1) 2
Transfers into Level 3 3 59
Transfers out of Level 3, assets 0 (4)
Purchases, assets 3 91
Issuance, assets 0 0
Sales, assets 0 (120)
Settlements, assets 0 0
Balance at end of period, asset 76 339
Unrealized gains (losses) still held, assets 0 2
Investments | Equity securities    
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation    
Balance at beginning of period, asset 2 9
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 (1) 0
Settlements, assets 0 0
Balance at end of period, asset 1 9
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 827 660
Net realized/unrealized gains (losses) included in principal transactions 0 0
Net realized/unrealized gains (losses) included in locations other than principal transactions, assets 10 9
Transfers into Level 3 2 17
Transfers out of Level 3, assets (342) 0
Purchases, assets 0 26
Issuance, assets 0 0
Sales, assets 0 0
Settlements, assets 0 0
Balance at end of period, asset 497 712
Unrealized gains (losses) still held, assets 7 3
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 11
Issuance, assets 0 0
Sales, assets 0 (11)
Settlements, assets 0 0
Balance at end of period, asset 0 0
Unrealized gains (losses) still held, assets 0 0
Investments | Non-marketable equity investments measured using the measurement alternative    
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation    
Balance at beginning of period, asset 681 1,331
Net realized/unrealized gains (losses) included in principal transactions 0 0
Net realized/unrealized gains (losses) included in locations other than principal transactions, assets 24 (94)
Transfers into Level 3 30 0
Transfers out of Level 3, assets 0 0
Purchases, assets 15 8
Issuance, assets 0 0
Sales, assets 0 (73)
Settlements, assets (16) (90)
Balance at end of period, asset 734 1,082
Unrealized gains (losses) still held, assets 22 (2)
Loans    
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation    
Balance at beginning of period, asset 550 568
Net realized/unrealized gains (losses) included in principal transactions 0 0
Net realized/unrealized gains (losses) included in locations other than principal transactions, assets 19 (4)
Transfers into Level 3 0 65
Transfers out of Level 3, assets (1) (16)
Purchases, assets 4 12
Issuance, assets 0 0
Sales, assets (16) (43)
Settlements, assets (2) (2)
Balance at end of period, asset 554 580
Unrealized gains (losses) still held, assets 26 74
Mortgage servicing rights    
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation    
Balance at beginning of period, asset 558 1,564
Net realized/unrealized gains (losses) included in principal transactions 0 0
Net realized/unrealized gains (losses) included in locations other than principal transactions, assets 46 67
Transfers into Level 3 0 0
Transfers out of Level 3, assets 0 0
Purchases, assets 0 0
Issuance, assets 17 35
Sales, assets (17) (1,046)
Settlements, assets (17) (53)
Balance at end of period, asset 587 567
Unrealized gains (losses) still held, assets 46 83
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 16 34
Net realized/unrealized gains (losses) included in principal transactions 0 0
Net realized/unrealized gains (losses) included in locations other than principal transactions, assets 8 (189)
Transfers into Level 3 0 3
Transfers out of Level 3, assets 0 (1)
Purchases, assets 4 0
Issuance, assets 12 29
Sales, assets 0 204
Settlements, assets (27) (53)
Balance at end of period, asset 13 27
Unrealized gains (losses) still held, assets $ 18 $ (191)