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FAIR VALUE MEASUREMENT - Level 3 Fair Value Rollforward (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Trading derivatives, net    
Fair value, Derivative assets (liabilities) measured on recurring basis, level 3 fair-value category reconciliation    
Balance at beginning of period, asset (liability), net $ (2,218) $ (578)
Net realized/unrealized gains (losses) included in principal transactions (739) (805)
Other 0 0
Transfers into Level 3 (83) 14
Transfers out of Level 3 240 665
Purchases 415 (232)
Issuances 6 0
Sales (31) (65)
Settlements (534) (36)
Balance at end of period, asset (liability), net (2,944) (1,037)
Unrealized gains (losses) still held (264) (1,589)
Trading derivatives, net | 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 (1,085) 355
Net realized/unrealized gains (losses) included in principal transactions (485) (139)
Other 0 0
Transfers into Level 3 31 (35)
Transfers out of Level 3 (29) 10
Purchases (27) 4
Issuances 6 0
Sales 3 0
Settlements 224 65
Balance at end of period, asset (liability), net (1,362) 260
Unrealized gains (losses) still held (580) (72)
Trading derivatives, net | 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 295 50
Net realized/unrealized gains (losses) included in principal transactions (46) 43
Other 0 0
Transfers into Level 3 2 (17)
Transfers out of Level 3 93 (2)
Purchases 694 75
Issuances 0 0
Sales (22) (39)
Settlements (681) (34)
Balance at end of period, asset (liability), net 335 76
Unrealized gains (losses) still held (147) 50
Trading derivatives, net | 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 (1,634) (1,104)
Net realized/unrealized gains (losses) included in principal transactions (349) (392)
Other 0 0
Transfers into Level 3 (144) (51)
Transfers out of Level 3 213 234
Purchases (270) (246)
Issuances 0 0
Sales (1) (23)
Settlements (37) 0
Balance at end of period, asset (liability), net (2,222) (1,582)
Unrealized gains (losses) still held 383 (1,271)
Trading derivatives, net | 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 279 278
Net realized/unrealized gains (losses) included in principal transactions 82 (325)
Other 0 0
Transfers into Level 3 31 100
Transfers out of Level 3 (6) 323
Purchases 10 (67)
Issuances 0 0
Sales (11) (3)
Settlements (43) (76)
Balance at end of period, asset (liability), net 342 230
Unrealized gains (losses) still held 143 (145)
Trading derivatives, net | 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 (73) (157)
Net realized/unrealized gains (losses) included in principal transactions 59 8
Other 0 0
Transfers into Level 3 (3) 17
Transfers out of Level 3 (31) 100
Purchases 8 2
Issuances 0 0
Sales 0 0
Settlements 3 9
Balance at end of period, asset (liability), net (37) (21)
Unrealized gains (losses) still held (63) (151)
Other financial liabilities measured on a recurring basis    
Fair value, liabilities measured on recurring basis, level 3 fair-value category reconciliation    
Balance at beginning of period, liability 6  
Net realized/unrealized gains (losses) included in principal transactions, liabilities 0  
Net realized/unrealized gains (losses) included in locations other than principal transactions, liabilities 0  
Transfers into Level 3, liabilities 0  
Transfers out of Level 3, liabilities 0  
Purchases, liability 0  
Issuance, liability 3  
Sales, liability 0  
Settlements, liability (6)  
Balance at end of period, liability 3  
Unrealized gains (losses) still held, liabilities 0  
Interest-bearing deposits    
Fair value, liabilities measured on recurring basis, level 3 fair-value category reconciliation    
Balance at beginning of period, liability 29 15
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 (2)
Transfers into Level 3, liabilities 46 0
Transfers out of Level 3, liabilities (1) (1)
Purchases, liability 0 0
Issuance, liability 5 0
Sales, liability 0 0
Settlements, liability (4) 0
Balance at end of period, liability 72 16
Unrealized gains (losses) still held, liabilities 3 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 390 1,031
Net realized/unrealized gains (losses) included in principal transactions, liabilities 0 (7)
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 254 824
Issuance, liability 0 0
Sales, liability 0 0
Settlements, liability (318) (1,053)
Balance at end of period, liability 326 809
Unrealized gains (losses) still held, liabilities 0 0
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 35 50
Net realized/unrealized gains (losses) included in principal transactions, liabilities (6) (15)
Net realized/unrealized gains (losses) included in locations other than principal transactions, liabilities 0 0
Transfers into Level 3, liabilities 1 6
Transfers out of Level 3, liabilities (2) (16)
Purchases, liability 87 31
Issuance, liability 0 0
Sales, liability 0 0
Settlements, liability (22) (14)
Balance at end of period, liability 105 72
Unrealized gains (losses) still held, liabilities (5) (1)
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  
Net realized/unrealized gains (losses) included in principal transactions, liabilities 0  
Net realized/unrealized gains (losses) included in locations other than principal transactions, liabilities 0  
Transfers into Level 3, liabilities 0  
Transfers out of Level 3, liabilities 0  
Purchases, liability 0  
Issuance, liability 0  
Sales, liability 0  
Settlements, liability 0  
Balance at end of period, liability 0  
Unrealized gains (losses) still held, liabilities  
Other trading liabilities    
Fair value, liabilities measured on recurring basis, level 3 fair-value category reconciliation    
Balance at beginning of period, liability   3
Net realized/unrealized gains (losses) included in principal transactions, liabilities   2
Net realized/unrealized gains (losses) included in locations other than principal transactions, liabilities   0
Transfers into Level 3, liabilities   0
Transfers out of Level 3, liabilities   0
Purchases, liability   0
Issuance, liability   0
Sales, liability   0
Settlements, liability   0
Balance at end of period, liability   1
Unrealized gains (losses) still held, liabilities   0
Short-term borrowings    
Fair value, liabilities measured on recurring basis, level 3 fair-value category reconciliation    
Balance at beginning of period, liability 481 38
Net realized/unrealized gains (losses) included in principal transactions, liabilities (94) 27
Net realized/unrealized gains (losses) included in locations other than principal transactions, liabilities 0 0
Transfers into Level 3, liabilities 11 0
Transfers out of Level 3, liabilities (38) (5)
Purchases, liability 1 0
Issuance, liability 34 276
Sales, liability 0 0
Settlements, liability 0 (1)
Balance at end of period, liability 583 281
Unrealized gains (losses) still held, liabilities (64) 0
Long-term debt    
Fair value, liabilities measured on recurring basis, level 3 fair-value category reconciliation    
Balance at beginning of period, liability 38,380 36,117
Net realized/unrealized gains (losses) included in principal transactions, liabilities 595 (1,120)
Net realized/unrealized gains (losses) included in locations other than principal transactions, liabilities 0 0
Transfers into Level 3, liabilities 1,358 1,098
Transfers out of Level 3, liabilities (840) (4,843)
Purchases, liability 0 0
Issuance, liability 3,590 3,536
Sales, liability 0 0
Settlements, liability (1,529) (447)
Balance at end of period, liability 40,364 36,581
Unrealized gains (losses) still held, liabilities 619 (1,061)
Other financial liabilities measured on a recurring basis    
Fair value, liabilities measured on recurring basis, level 3 fair-value category reconciliation    
Balance at beginning of period, liability   2
Net realized/unrealized gains (losses) included in principal transactions, liabilities   0
Net realized/unrealized gains (losses) included in locations other than principal transactions, liabilities   2
Transfers into Level 3, liabilities   0
Transfers out of Level 3, liabilities   0
Purchases, liability   0
Issuance, liability   20
Sales, liability   0
Settlements, liability   0
Balance at end of period, liability   20
Unrealized gains (losses) still held, liabilities   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 139 149
Net realized/unrealized gains (losses) included in principal transactions (5) 13
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 45 137
Issuance, assets 0 0
Sales, assets 0 0
Settlements, assets (47) (146)
Balance at end of period, asset 132 153
Unrealized gains (losses) still held, assets (4) 14
Trading non-derivative assets    
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation    
Balance at beginning of period, asset 3,119 2,940
Net realized/unrealized gains (losses) included in principal transactions 142 99
Net realized/unrealized gains (losses) included in locations other than principal transactions, assets 0 0
Transfers into Level 3 254 469
Transfers out of Level 3, assets (714) (397)
Purchases, assets 1,237 853
Issuance, assets 4 0
Sales, assets (1,231) (722)
Settlements, assets (19) 0
Balance at end of period, asset 2,792 3,242
Unrealized gains (losses) still held, assets 60 152
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 899 911
Net realized/unrealized gains (losses) included in principal transactions (23) 18
Net realized/unrealized gains (losses) included in locations other than principal transactions, assets 0 0
Transfers into Level 3 128 174
Transfers out of Level 3, assets (256) (174)
Purchases, assets 610 303
Issuance, assets 0 0
Sales, assets (498) (249)
Settlements, assets 0 0
Balance at end of period, asset 860 983
Unrealized gains (losses) still held, assets (27) 11
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 581 600
Net realized/unrealized gains (losses) included in principal transactions (39) 22
Net realized/unrealized gains (losses) included in locations other than principal transactions, assets 0 0
Transfers into Level 3 79 92
Transfers out of Level 3, assets (154) (142)
Purchases, assets 200 223
Issuance, assets 0 0
Sales, assets (136) (137)
Settlements, assets 0 0
Balance at end of period, asset 531 658
Unrealized gains (losses) still held, assets (33) 19
Trading non-derivative assets | Residential    
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation    
Balance at beginning of period, asset 116 166
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 36 26
Transfers out of Level 3, assets (35) (19)
Purchases, assets 313 61
Issuance, assets 0 0
Sales, assets (262) (73)
Settlements, assets 0 0
Balance at end of period, asset 170 162
Unrealized gains (losses) still held, assets 2 (4)
Trading non-derivative assets | Commercial Mortgage-Backed Securities    
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation    
Balance at beginning of period, asset 202 145
Net realized/unrealized gains (losses) included in principal transactions 14 (5)
Net realized/unrealized gains (losses) included in locations other than principal transactions, assets 0 0
Transfers into Level 3 13 56
Transfers out of Level 3, assets (67) (13)
Purchases, assets 97 19
Issuance, assets 0 0
Sales, assets (100) (39)
Settlements, assets 0 0
Balance at end of period, asset 159 163
Unrealized gains (losses) still held, assets 4 (4)
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 7 1
Net realized/unrealized gains (losses) included in principal transactions 4 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 (1) 0
Purchases, assets 0 0
Issuance, assets 0 0
Sales, assets 0 0
Settlements, assets (10) 0
Balance at end of period, asset 0 1
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 3 7
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 19
Transfers out of Level 3, assets 0 0
Purchases, assets 0 0
Issuance, assets 0 0
Sales, assets (2) (1)
Settlements, assets 0 0
Balance at end of period, asset 1 23
Unrealized gains (losses) still held, assets 0 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 54 119
Net realized/unrealized gains (losses) included in principal transactions 0 7
Net realized/unrealized gains (losses) included in locations other than principal transactions, assets 0 0
Transfers into Level 3 12 0
Transfers out of Level 3, assets (40) (25)
Purchases, assets 125 12
Issuance, assets 0 0
Sales, assets (38) (60)
Settlements, assets 0 0
Balance at end of period, asset 113 53
Unrealized gains (losses) still held, assets 2 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 500 394
Net realized/unrealized gains (losses) included in principal transactions 73 30
Net realized/unrealized gains (losses) included in locations other than principal transactions, assets 0 0
Transfers into Level 3 13 14
Transfers out of Level 3, assets (208) (127)
Purchases, assets 260 96
Issuance, assets 0 0
Sales, assets (166) (111)
Settlements, assets (8) 0
Balance at end of period, asset 464 296
Unrealized gains (losses) still held, assets 68 90
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 292 192
Net realized/unrealized gains (losses) included in principal transactions 18 3
Net realized/unrealized gains (losses) included in locations other than principal transactions, assets 0 0
Transfers into Level 3 29 12
Transfers out of Level 3, assets (23) (6)
Purchases, assets 31 31
Issuance, assets 0 0
Sales, assets (115) (7)
Settlements, assets 0 0
Balance at end of period, asset 232 225
Unrealized gains (losses) still held, assets 10 4
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 531 668
Net realized/unrealized gains (losses) included in principal transactions 3 15
Net realized/unrealized gains (losses) included in locations other than principal transactions, assets 0 0
Transfers into Level 3 15 5
Transfers out of Level 3, assets (118) (63)
Purchases, assets 136 121
Issuance, assets 0 0
Sales, assets (197) (179)
Settlements, assets 0 0
Balance at end of period, asset 370 567
Unrealized gains (losses) still held, assets (39) 5
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, asset 833 648
Net realized/unrealized gains (losses) included in principal transactions 67 28
Net realized/unrealized gains (losses) included in locations other than principal transactions, assets 0 0
Transfers into Level 3 57 245
Transfers out of Level 3, assets (68) (2)
Purchases, assets 75 290
Issuance, assets 4 0
Sales, assets (215) (115)
Settlements, assets (1) 0
Balance at end of period, asset 752 1,094
Unrealized gains (losses) still held, assets 46 36
Investments    
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation    
Balance at beginning of period, asset 1,799 2,049
Net realized/unrealized gains (losses) included in principal transactions 0 0
Net realized/unrealized gains (losses) included in locations other than principal transactions, assets (62) 13
Transfers into Level 3 36 13
Transfers out of Level 3, assets (287) (137)
Purchases, assets 119 281
Issuance, assets 0 0
Sales, assets (166) (326)
Settlements, assets 0 0
Balance at end of period, asset 1,439 1,893
Unrealized gains (losses) still held, assets (37) 7
Investments | Mortgage-backed securities    
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation    
Balance at beginning of period, asset 191 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 (4) (2)
Transfers into Level 3 0 0
Transfers out of Level 3, assets (90) 0
Purchases, assets 3 0
Issuance, assets 0 0
Sales, assets (48) (16)
Settlements, assets 0 0
Balance at end of period, asset 52 53
Unrealized gains (losses) still held, assets (4) (1)
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 75 30
Net realized/unrealized gains (losses) included in principal transactions 0 0
Net realized/unrealized gains (losses) included in locations other than principal transactions, assets (3) (2)
Transfers into Level 3 0 0
Transfers out of Level 3, assets 0 0
Purchases, assets 3 0
Issuance, assets 0 0
Sales, assets (48) 0
Settlements, assets 0 0
Balance at end of period, asset 27 28
Unrealized gains (losses) still held, assets (3) (1)
Investments | Residential    
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation    
Balance at beginning of period, asset 116 41
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) 0
Transfers into Level 3 0 0
Transfers out of Level 3, assets (90) 0
Purchases, assets 0 0
Issuance, assets 0 0
Sales, assets 0 (16)
Settlements, assets 0 0
Balance at end of period, asset 25 25
Unrealized gains (losses) still held, assets (1) 0
Investments | Commercial Mortgage-Backed Securities    
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation    
Balance at beginning of period, asset 0  
Net realized/unrealized gains (losses) included in principal transactions 0  
Net realized/unrealized gains (losses) included in locations other than principal transactions, assets 0  
Transfers into Level 3 0  
Transfers out of Level 3, assets 0  
Purchases, assets 0  
Issuance, assets 0  
Sales, assets 0  
Settlements, assets 0  
Balance at end of period, asset 0  
Unrealized gains (losses) still held, assets 0  
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 51
Issuance, assets 0 0
Sales, assets 0 0
Settlements, assets 0 0
Balance at end of period, asset 0 51
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 542 586
Net realized/unrealized gains (losses) included in principal transactions 0 0
Net realized/unrealized gains (losses) included in locations other than principal transactions, assets (26) 17
Transfers into Level 3 0 1
Transfers out of Level 3, assets (1) (75)
Purchases, assets 0 1
Issuance, assets 0 0
Sales, assets (36) (9)
Settlements, assets 0 0
Balance at end of period, asset 479 521
Unrealized gains (losses) still held, assets (28) 12
Investments | Foreign government    
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation    
Balance at beginning of period, asset 194 608
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) (2)
Transfers into Level 3 6 10
Transfers out of Level 3, assets (168) (1)
Purchases, assets 36 160
Issuance, assets 0 0
Sales, assets (36) (224)
Settlements, assets 0 0
Balance at end of period, asset 24 551
Unrealized gains (losses) still held, assets 0 2
Investments | Corporate    
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation    
Balance at beginning of period, asset 362 343
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 3
Transfers into Level 3 30 0
Transfers out of Level 3, assets (28) (61)
Purchases, assets 41 58
Issuance, assets 0 0
Sales, assets (17) (52)
Settlements, assets 0 0
Balance at end of period, asset 388 291
Unrealized gains (losses) still held, assets 6 0
Investments | Marketable equity securities    
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 0 0
Net realized/unrealized gains (losses) included in locations other than principal transactions, assets (19) 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 8 12
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 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
Investments | Other debt 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 (1)
Transfers into Level 3 0 0
Transfers out of Level 3, assets 0 0
Purchases, assets 0 5
Issuance, assets 0 0
Sales, assets 0 0
Settlements, assets 0 0
Balance at end of period, asset 0 4
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 483 430
Net realized/unrealized gains (losses) included in principal transactions 0 0
Net realized/unrealized gains (losses) included in locations other than principal transactions, assets (5) (4)
Transfers into Level 3 0 2
Transfers out of Level 3, assets 0 0
Purchases, assets 39 6
Issuance, assets 0 0
Sales, assets (29) (25)
Settlements, assets 0 0
Balance at end of period, asset 488 409
Unrealized gains (losses) still held, assets (11) (6)
Loans    
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation    
Balance at beginning of period, asset 427 1,361
Net realized/unrealized gains (losses) included in principal transactions 0 0
Net realized/unrealized gains (losses) included in locations other than principal transactions, assets (29) 17
Transfers into Level 3 663 0
Transfers out of Level 3, assets (40) (190)
Purchases, assets 0 0
Issuance, assets 104 106
Sales, assets 0 0
Settlements, assets (68) (654)
Balance at end of period, asset 1,057 640
Unrealized gains (losses) still held, assets (6) (14)
Mortgage servicing rights    
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation    
Balance at beginning of period, asset 691 665
Net realized/unrealized gains (losses) included in principal transactions 0 0
Net realized/unrealized gains (losses) included in locations other than principal transactions, assets 12 (3)
Transfers into Level 3 0 0
Transfers out of Level 3, assets 0 0
Purchases, assets 0 0
Issuance, assets 17 12
Sales, assets 0 0
Settlements, assets (18) (16)
Balance at end of period, asset 702 658
Unrealized gains (losses) still held, assets 18 (3)
Other financial assets measured at fair value on a recurring basis    
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation    
Balance at beginning of period, asset 30 57
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) (3)
Transfers into Level 3 0 0
Transfers out of Level 3, assets 0 (1)
Purchases, assets 3 1
Issuance, assets 13 0
Sales, assets 0 (2)
Settlements, assets (14) 0
Balance at end of period, asset 31 52
Unrealized gains (losses) still held, assets $ (1) $ 4