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FAIR VALUE MEASUREMENT - Level 3 Fair Value Rollforward (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Trading account assets and liabilities    
Fair value, Derivative assets (liabilities) measured on recurring basis, level 3 fair-value category reconciliation    
Balance at beginning of period, asset (liability), net $ (1,207) $ (1,715)
Net realized/unrealized gains (losses) included in principal transactions 243 613
Other 0 0
Transfers into Level 3 224 1,263
Transfers out of Level 3 4 (131)
Purchases 113 94
Issuances (84) 56
Sales (148) (30)
Settlements (75) 45
Balance at end of period, asset (liability), net (930) 195
Unrealized gains (losses) still held 412 615
Trading account assets and liabilities | Interest rate contracts    
Fair value, Derivative assets (liabilities) measured on recurring basis, level 3 fair-value category reconciliation    
Balance at beginning of period, asset (liability), net 1,614 1
Net realized/unrealized gains (losses) included in principal transactions (172) 351
Other 0 0
Transfers into Level 3 (45) 1,383
Transfers out of Level 3 0 (22)
Purchases 0 1
Issuances (84) 56
Sales 0 13
Settlements (84) (28)
Balance at end of period, asset (liability), net 1,229 1,755
Unrealized gains (losses) still held (85) 314
Trading account assets and liabilities | Foreign exchange contracts    
Fair value, Derivative assets (liabilities) measured on recurring basis, level 3 fair-value category reconciliation    
Balance at beginning of period, asset (liability), net 52 (5)
Net realized/unrealized gains (losses) included in principal transactions (138) (15)
Other 0 0
Transfers into Level 3 8 (25)
Transfers out of Level 3 0 9
Purchases 23 44
Issuances 0 0
Sales (15) (8)
Settlements (16) 2
Balance at end of period, asset (liability), net (86) 2
Unrealized gains (losses) still held (31) 19
Trading account assets and liabilities | Equity contracts    
Fair value, Derivative assets (liabilities) measured on recurring basis, level 3 fair-value category reconciliation    
Balance at beginning of period, asset (liability), net (3,213) (1,596)
Net realized/unrealized gains (losses) included in principal transactions 303 (210)
Other 0 0
Transfers into Level 3 36 (287)
Transfers out of Level 3 6 224
Purchases 24 3
Issuances 0 0
Sales (23) (1)
Settlements (9) 31
Balance at end of period, asset (liability), net (2,876) (1,836)
Unrealized gains (losses) still held 268 (223)
Trading account assets and liabilities | Commodity contracts    
Fair value, Derivative assets (liabilities) measured on recurring basis, level 3 fair-value category reconciliation    
Balance at beginning of period, asset (liability), net 292 (59)
Net realized/unrealized gains (losses) included in principal transactions 314 (459)
Other 0 0
Transfers into Level 3 158 38
Transfers out of Level 3 (5) (56)
Purchases 66 46
Issuances 0 0
Sales (110) (34)
Settlements 17 (18)
Balance at end of period, asset (liability), net 732 (542)
Unrealized gains (losses) still held 324 (441)
Trading account assets and liabilities | Credit derivatives    
Fair value, Derivative assets (liabilities) measured on recurring basis, level 3 fair-value category reconciliation    
Balance at beginning of period, asset (liability), net 48 (56)
Net realized/unrealized gains (losses) included in principal transactions (64) 946
Other 0 0
Transfers into Level 3 67 154
Transfers out of Level 3 3 (286)
Purchases 0 0
Issuances 0 0
Sales 0 0
Settlements 17 58
Balance at end of period, asset (liability), net 71 816
Unrealized gains (losses) still held (64) 946
Interest-bearing deposits    
Fair value, liabilities measured on recurring basis, level 3 fair-value category reconciliation    
Balance at beginning of period, liability 206 215
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 16 (6)
Transfers into Level 3, liabilities 0 278
Transfers out of Level 3, liabilities 0 0
Purchases, liability 0 0
Issuance, liability 9 0
Sales, liability 0 0
Settlements, liability 0 (8)
Balance at end of period, liability 199 491
Unrealized gains (losses) still held, liabilities 7 0
Securities loaned and sold under agreements to repurchase    
Fair value, liabilities measured on recurring basis, level 3 fair-value category reconciliation    
Balance at beginning of period, liability 631 757
Net realized/unrealized gains (losses) included in principal transactions, liabilities (15) 27
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 408 0
Issuance, liability 0 0
Sales, liability 0 0
Settlements, liability (77) 0
Balance at end of period, liability 977 730
Unrealized gains (losses) still held, liabilities (15) (33)
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 214 48
Net realized/unrealized gains (losses) included in principal transactions, liabilities 54 (167)
Net realized/unrealized gains (losses) included in locations other than principal transactions, liabilities 0 0
Transfers into Level 3, liabilities 8 8
Transfers out of Level 3, liabilities (4) (10)
Purchases, liability 10 0
Issuance, liability 0 9
Sales, liability 0 0
Settlements, liability (7) (22)
Balance at end of period, liability 167 200
Unrealized gains (losses) still held, liabilities 39 (240)
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 26 0
Net realized/unrealized gains (losses) included in principal transactions, liabilities 20 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 0
Balance at end of period, liability 6 0
Unrealized gains (losses) still held, liabilities 21 0
Short-term borrowings    
Fair value, liabilities measured on recurring basis, level 3 fair-value category reconciliation    
Balance at beginning of period, liability 219 13
Net realized/unrealized gains (losses) included in principal transactions, liabilities (1) 10
Net realized/unrealized gains (losses) included in locations other than principal transactions, liabilities 0 0
Transfers into Level 3, liabilities 2 11
Transfers out of Level 3, liabilities (12) 0
Purchases, liability 0 0
Issuance, liability 8 38
Sales, liability 0 0
Settlements, liability (169) 0
Balance at end of period, liability 49 52
Unrealized gains (losses) still held, liabilities (1) 10
Long-term debt    
Fair value, Derivative assets (liabilities) measured on recurring basis, level 3 fair-value category reconciliation    
Transfers out of Level 3   (2,700)
Fair value, liabilities measured on recurring basis, level 3 fair-value category reconciliation    
Balance at beginning of period, liability 25,210 17,169
Net realized/unrealized gains (losses) included in principal transactions, liabilities 2,622 1,311
Net realized/unrealized gains (losses) included in locations other than principal transactions, liabilities 0 0
Transfers into Level 3, liabilities 932 3,189
Transfers out of Level 3, liabilities (2) (2,693)
Purchases, liability 0 0
Issuance, liability 5,720 4,261
Sales, liability 0 0
Settlements, liability (2,901) (1,346)
Balance at end of period, liability 26,337 19,269
Unrealized gains (losses) still held, liabilities 1,962 936
Long-term debt | Interest rate contracts    
Fair value, liabilities measured on recurring basis, level 3 fair-value category reconciliation    
Transfers into Level 3, liabilities   2,000
Long-term debt | Securities sold, not yet purchased    
Fair value, liabilities measured on recurring basis, level 3 fair-value category reconciliation    
Transfers into Level 3, liabilities   1,200
Other financial liabilities    
Fair value, liabilities measured on recurring basis, level 3 fair-value category reconciliation    
Balance at beginning of period, liability 1 0
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 (3) 0
Transfers into Level 3, liabilities 0 0
Transfers out of Level 3, liabilities 0 0
Purchases, liability 0 0
Issuance, liability 14 2
Sales, liability 0 0
Settlements, liability (10) (2)
Balance at end of period, liability 8 0
Unrealized gains (losses) still held, liabilities (3) 0
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 320 303
Net realized/unrealized gains (losses) included in principal transactions (9) (20)
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 233 66
Issuance, assets 0 0
Sales, assets 0 0
Settlements, assets (282) (49)
Balance at end of period, asset 262 300
Unrealized gains (losses) still held, assets 3 3
Trading non-derivative assets    
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation    
Balance at beginning of period, asset 3,647 2,455
Net realized/unrealized gains (losses) included in principal transactions 158 160
Net realized/unrealized gains (losses) included in locations other than principal transactions, assets 0 0
Transfers into Level 3 127 402
Transfers out of Level 3, assets (215) (148)
Purchases, assets 1,023 1,273
Issuance, assets 4 8
Sales, assets (2,042) (821)
Settlements, assets (4) (10)
Balance at end of period, asset 2,698 3,319
Unrealized gains (losses) still held, assets (31) 197
Trading non-derivative assets | Mortgage securitizations - U.S. agency-sponsored    
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation    
Balance at beginning of period, asset 27 10
Net realized/unrealized gains (losses) included in principal transactions (1) (75)
Net realized/unrealized gains (losses) included in locations other than principal transactions, assets 0 0
Transfers into Level 3 14 12
Transfers out of Level 3, assets (1) (3)
Purchases, assets 1 141
Issuance, assets 0 0
Sales, assets (2) 0
Settlements, assets 0 0
Balance at end of period, asset 38 85
Unrealized gains (losses) still held, assets (1) 4
Trading non-derivative assets | Residential mortgages    
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation    
Balance at beginning of period, asset 340 123
Net realized/unrealized gains (losses) included in principal transactions 23 (8)
Net realized/unrealized gains (losses) included in locations other than principal transactions, assets 0 0
Transfers into Level 3 28 60
Transfers out of Level 3, assets (3) (4)
Purchases, assets 144 178
Issuance, assets 0 0
Sales, assets (264) (45)
Settlements, assets 0 0
Balance at end of period, asset 268 304
Unrealized gains (losses) still held, assets 7 (11)
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 136 61
Net realized/unrealized gains (losses) included in principal transactions 5 0
Net realized/unrealized gains (losses) included in locations other than principal transactions, assets 0 0
Transfers into Level 3 16 3
Transfers out of Level 3, assets (33) (3)
Purchases, assets 13 27
Issuance, assets 0 0
Sales, assets (78) (44)
Settlements, assets 0 0
Balance at end of period, asset 59 44
Unrealized gains (losses) still held, assets (7) (1)
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 503 194
Net realized/unrealized gains (losses) included in principal transactions 27 (83)
Net realized/unrealized gains (losses) included in locations other than principal transactions, assets 0 0
Transfers into Level 3 58 75
Transfers out of Level 3, assets (37) (10)
Purchases, assets 158 346
Issuance, assets 0 0
Sales, assets (344) (89)
Settlements, assets 0 0
Balance at end of period, asset 365 433
Unrealized gains (losses) still held, assets (1) (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, 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
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, asset 94 64
Net realized/unrealized gains (losses) included in principal transactions 0 2
Net realized/unrealized gains (losses) included in locations other than principal transactions, assets 0 0
Transfers into Level 3 0 10
Transfers out of Level 3, assets 0 (2)
Purchases, assets 0 21
Issuance, assets 0 0
Sales, assets 0 (3)
Settlements, assets 0 0
Balance at end of period, asset 94 92
Unrealized gains (losses) still held, assets 1 0
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 51 52
Net realized/unrealized gains (losses) included in principal transactions 1 (85)
Net realized/unrealized gains (losses) included in locations other than principal transactions, assets 0 0
Transfers into Level 3 11 0
Transfers out of Level 3, assets 0 0
Purchases, assets 57 86
Issuance, assets 0 0
Sales, assets (39) (14)
Settlements, assets 0 0
Balance at end of period, asset 81 39
Unrealized gains (losses) still held, assets (3) 70
Trading non-derivative assets | Corporate    
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation    
Balance at beginning of period, asset 375 313
Net realized/unrealized gains (losses) included in principal transactions 90 302
Net realized/unrealized gains (losses) included in locations other than principal transactions, assets 0 0
Transfers into Level 3 6 22
Transfers out of Level 3, assets (118) 8
Purchases, assets 67 215
Issuance, assets 0 0
Sales, assets (130) (448)
Settlements, assets 0 0
Balance at end of period, asset 290 412
Unrealized gains (losses) still held, assets 41 246
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 73 100
Net realized/unrealized gains (losses) included in principal transactions 45 0
Net realized/unrealized gains (losses) included in locations other than principal transactions, assets 0 0
Transfers into Level 3 4 28
Transfers out of Level 3, assets (2) (3)
Purchases, assets 12 32
Issuance, assets 0 0
Sales, assets (43) (14)
Settlements, assets 0 0
Balance at end of period, asset 89 143
Unrealized gains (losses) still held, assets 9 1
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 1,606 1,177
Net realized/unrealized gains (losses) included in principal transactions 39 (169)
Net realized/unrealized gains (losses) included in locations other than principal transactions, assets 0 0
Transfers into Level 3 18 239
Transfers out of Level 3, assets (50) (4)
Purchases, assets 582 468
Issuance, assets 0 0
Sales, assets (987) (150)
Settlements, assets 0 0
Balance at end of period, asset 1,208 1,561
Unrealized gains (losses) still held, assets (79) (307)
Trading non-derivative assets | Other    
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation    
Balance at beginning of period, asset 945 555
Net realized/unrealized gains (losses) included in principal transactions (44) 193
Net realized/unrealized gains (losses) included in locations other than principal transactions, assets 0 0
Transfers into Level 3 30 28
Transfers out of Level 3, assets (8) (137)
Purchases, assets 147 105
Issuance, assets 4 8
Sales, assets (499) (103)
Settlements, assets (4) (10)
Balance at end of period, asset 571 639
Unrealized gains (losses) still held, assets 1 195
Investments    
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation    
Balance at beginning of period, asset 1,542 1,259
Net realized/unrealized gains (losses) included in principal transactions 0 0
Net realized/unrealized gains (losses) included in locations other than principal transactions, assets (14) (96)
Transfers into Level 3 8 214
Transfers out of Level 3, assets 0 1
Purchases, assets 331 299
Issuance, assets 0 0
Sales, assets (108) (100)
Settlements, assets 0 (10)
Balance at end of period, asset 1,759 1,567
Unrealized gains (losses) still held, assets (23) (67)
Investments | Mortgage securitizations - U.S. agency-sponsored    
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation    
Balance at beginning of period, asset 30 32
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 14
Transfers into Level 3 0 0
Transfers out of Level 3, assets 0 1
Purchases, assets 0 0
Issuance, assets 0 0
Sales, assets 0 0
Settlements, assets 0 0
Balance at end of period, asset 30 47
Unrealized gains (losses) still held, assets 0 34
Investments | Residential mortgages    
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 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 | Mortgage-backed securities    
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation    
Balance at beginning of period, asset 30 32
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 14
Transfers into Level 3 0 0
Transfers out of Level 3, assets 0 1
Purchases, assets 0 0
Issuance, assets 0 0
Sales, assets 0 0
Settlements, assets 0 0
Balance at end of period, asset 30 47
Unrealized gains (losses) still held, assets 0 34
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    
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation    
Balance at beginning of period, asset 834 623
Net realized/unrealized gains (losses) included in principal transactions 0 0
Net realized/unrealized gains (losses) included in locations other than principal transactions, assets (18) (31)
Transfers into Level 3 4 138
Transfers out of Level 3, assets 0 0
Purchases, assets 1 0
Issuance, assets 0 0
Sales, assets (27) (43)
Settlements, assets 0 0
Balance at end of period, asset 794 687
Unrealized gains (losses) still held, assets (16) (9)
Investments | Foreign government    
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation    
Balance at beginning of period, asset 268 96
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) (2)
Transfers into Level 3 0 27
Transfers out of Level 3, assets 0 0
Purchases, assets 330 147
Issuance, assets 0 0
Sales, assets (73) (43)
Settlements, assets 0 0
Balance at end of period, asset 523 225
Unrealized gains (losses) still held, assets (11) (16)
Investments | Corporate    
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation    
Balance at beginning of period, asset 60 45
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) (8)
Transfers into Level 3 0 49
Transfers out of Level 3, assets 0 0
Purchases, assets 0 152
Issuance, assets 0 0
Sales, assets 0 0
Settlements, assets 0 0
Balance at end of period, asset 56 238
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 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 | Asset-backed securities    
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation    
Balance at beginning of period, asset 1 22
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 5
Transfers into Level 3 3 0
Transfers out of Level 3, assets 0 0
Purchases, assets 0 0
Issuance, assets 0 0
Sales, assets 0 (11)
Settlements, assets 0 0
Balance at end of period, asset 4 16
Unrealized gains (losses) still held, assets 0 0
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 349 441
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 (74)
Transfers into Level 3 1 0
Transfers out of Level 3, assets 0 0
Purchases, assets 0 0
Issuance, assets 0 0
Sales, assets (8) (3)
Settlements, assets 0 (10)
Balance at end of period, asset 352 354
Unrealized gains (losses) still held, assets 4 (76)
Loans    
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation    
Balance at beginning of period, asset 1,985 402
Net realized/unrealized gains (losses) included in principal transactions 0 0
Net realized/unrealized gains (losses) included in locations other than principal transactions, assets (128) (79)
Transfers into Level 3 211 217
Transfers out of Level 3, assets 0 (1)
Purchases, assets 0 0
Issuance, assets 1 0
Sales, assets 0 0
Settlements, assets (125) (2)
Balance at end of period, asset 1,944 537
Unrealized gains (losses) still held, assets (125) (127)
Mortgage servicing rights    
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation    
Balance at beginning of period, asset 336 495
Net realized/unrealized gains (losses) included in principal transactions 0 0
Net realized/unrealized gains (losses) included in locations other than principal transactions, assets 73 (143)
Transfers into Level 3 0 0
Transfers out of Level 3, assets 0 0
Purchases, assets 0 0
Issuance, assets 43 32
Sales, assets 0 0
Settlements, assets (19) (17)
Balance at end of period, asset 433 367
Unrealized gains (losses) still held, assets 80 (133)
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 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 (1)
Settlements, assets 0 0
Balance at end of period, asset 0 0
Unrealized gains (losses) still held, assets $ 0 $ 0