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Fair Value Measurement - Changes in Level 3 Recurring Measurements (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Net derivative receivables:          
Fair value, beginning balance $ (5,139) $ (2,425) $ (4,993) $ (4,489)  
Total realized/unrealized gains/(losses) (796) (7) (591) 3,038  
Purchases 343 589 597 774  
Sales (547) (582) (1,699) (1,327)  
Settlements 113 (528) 122 (224)  
Transfers into level 3 (98) (60) 75 (834)  
Transfers (out of) level 3 (601) (156) (236) (107)  
Fair value, ending balance (6,725) (3,169) (6,725) (3,169)  
Change in unrealized gains/(losses) related to financial instruments held $ (1,059) (879) $ (1,413) 2,539  
Level 3 Rollforward Supplemental Data [Abstract]          
Level 3 assets as a percentage of total firm assets at fair value 1.00%   1.00%   1.00%
Level 3 liabilities as a percentage of total firm liabilities at fair value 8.00%   8.00%   9.00%
Deposits          
Liabilities:          
Fair value, beginning balance $ 2,652 3,179 $ 2,913 3,360  
Total realized/unrealized (gains)/losses 47 194 (56) 45  
Purchases 0 0 0 0  
Sales 0 0 0 0  
Issuances 150 80 219 466  
Settlements (93) (256) (188) (428)  
Transfers into level 3 1 261 2 265  
Transfers (out of) level 3 (73) (241) (206) (491)  
Fair value, ending balance 2,684 3,217 2,684 3,217  
Change in unrealized (gains)/losses related to financials instruments held 47 160 (56) 58  
Short-term borrowings          
Liabilities:          
Fair value, beginning balance 3,664 2,039 2,420 1,674  
Total realized/unrealized (gains)/losses (283) 98 (396) (247)  
Purchases 0 0 0 0  
Sales 0 0 0 0  
Issuances 1,395 925 4,313 2,540  
Settlements (1,706) (747) (3,212) (1,676)  
Transfers into level 3 9 12 9 52  
Transfers (out of) level 3 (4) (22) (59) (38)  
Fair value, ending balance 3,075 2,305 3,075 2,305  
Change in unrealized (gains)/losses related to financials instruments held 35 85 18 (37)  
Total debt and equity instruments          
Liabilities:          
Fair value, beginning balance 60 61 51 41  
Total realized/unrealized (gains)/losses (1) 0 (4) 3  
Purchases (27) (1) (92) (76)  
Sales 13 0 34 7  
Issuances 0 0 0 0  
Settlements 0 (5) 0 (5)  
Transfers into level 3 0 7 59 93  
Transfers (out of) level 3 (9) (3) (12) (4)  
Fair value, ending balance 36 59 36 59  
Change in unrealized (gains)/losses related to financials instruments held 0 0 10 2  
Accounts payable and other liabilities          
Liabilities:          
Fair value, beginning balance 61 15 68 45  
Total realized/unrealized (gains)/losses (9) 4 (10) (4)  
Purchases 0 0 0 (23)  
Sales 0 32 1 33  
Issuances 0 0 0 0  
Settlements 0 0 0 0  
Transfers into level 3 0 40 0 40  
Transfers (out of) level 3 (1) 0 (8) 0  
Fair value, ending balance 51 91 51 91  
Change in unrealized (gains)/losses related to financials instruments held (8) 3 (10) (4)  
Beneficial interests issued by consolidated VIEs          
Liabilities:          
Fair value, beginning balance   0      
Total realized/unrealized (gains)/losses   0      
Purchases   0      
Sales   0      
Issuances   0      
Settlements   0      
Transfers into level 3   0      
Transfers (out of) level 3   0      
Fair value, ending balance   0   0  
Change in unrealized (gains)/losses related to financials instruments held   0      
Long-term debt          
Liabilities:          
Fair value, beginning balance 22,575 20,141 23,397 23,339  
Total realized/unrealized (gains)/losses 714 2,705 406 (1,405)  
Purchases 0 0 0 0  
Sales 0 0 0 0  
Issuances 3,469 1,600 6,934 6,207  
Settlements (3,089) (1,809) (6,738) (5,358)  
Transfers into level 3 7 608 18 978  
Transfers (out of) level 3 (149) (517) (490) (1,033)  
Fair value, ending balance 23,527 22,728 23,527 22,728  
Change in unrealized (gains)/losses related to financials instruments held 708 2,194 305 (476)  
DVA for fair value option elected liabilities          
Level 3 Rollforward Supplemental Data [Abstract]          
Unrealized (gains)/losses on liabilities recorded in OCI 5 940 (17) (199)  
Interest rate          
Net derivative receivables:          
Fair value, beginning balance 149 (136) 258 (332)  
Total realized/unrealized gains/(losses) 524 753 969 1,395  
Purchases 18 21 71 87  
Sales (9) (17) (102) (67)  
Settlements (657) (622) (1,191) (863)  
Transfers into level 3 (2) (180) 55 (352)  
Transfers (out of) level 3 (45) 77 (82) 28  
Fair value, ending balance (22) (104) (22) (104)  
Change in unrealized gains/(losses) related to financial instruments held 198 447 233 286  
Credit          
Net derivative receivables:          
Fair value, beginning balance (4) (111) (224) (139)  
Total realized/unrealized gains/(losses) (34) (46) 149 62  
Purchases 1 30 2 48  
Sales (2) (6) (4) (134)  
Settlements 17 16 44 (17)  
Transfers into level 3 (6) 11 (9) 71  
Transfers (out of) level 3 11 (31) 25 (28)  
Fair value, ending balance (17) (137) (17) (137)  
Change in unrealized gains/(losses) related to financial instruments held (13) (41) 134 28  
Foreign exchange          
Net derivative receivables:          
Fair value, beginning balance (539) (927) (434) (607)  
Total realized/unrealized gains/(losses) 2 182 (198) (157)  
Purchases 37 1 39 39  
Sales (48) (5) (54) (9)  
Settlements (12) 123 99 109  
Transfers into level 3 1 8 11 8  
Transfers (out of) level 3 (24) 23 (46) 22  
Fair value, ending balance (583) (595) (583) (595)  
Change in unrealized gains/(losses) related to financial instruments held (104) (249) 32 (118)  
Equity          
Net derivative receivables:          
Fair value, beginning balance (3,834) (826) (3,862) (3,395)  
Total realized/unrealized gains/(losses) (941) (1,036) (918) 2,001  
Purchases 281 530 475 589  
Sales (407) (541) (1,245) (1,089)  
Settlements 600 (54) 726 529  
Transfers into level 3 (91) 99 19 (557)  
Transfers (out of) level 3 (544) (208) (131) (114)  
Fair value, ending balance (4,936) (2,036) (4,936) (2,036)  
Change in unrealized gains/(losses) related to financial instruments held (942) (1,215) (1,258) 2,619  
Commodity          
Net derivative receivables:          
Fair value, beginning balance (911) (425) (731) (16)  
Total realized/unrealized gains/(losses) (347) 140 (593) (263)  
Purchases 6 7 10 11  
Sales (81) (13) (294) (28)  
Settlements 165 9 444 18  
Transfers into level 3 0 2 (1) (4)  
Transfers (out of) level 3 1 (17) (2) (15)  
Fair value, ending balance (1,167) (297) (1,167) (297)  
Change in unrealized gains/(losses) related to financial instruments held (198) 179 (554) (276)  
Total mortgage-backed securities          
Assets:          
Fair value, beginning balance 431 546 480 824  
Total realized/unrealized gains/(losses) (33) (10) (9) (150)  
Purchases 18 7 33 29  
Sales (29) (7) (81) (123)  
Settlements (32) (41) (67) (84)  
Transfers into level 3 1 0 1 1  
Transfers (out of) level 3 (1) (1) (2) (3)  
Fair value, ending balance 355 494 355 494  
Change in unrealized gains/(losses) related to financial instruments held (33) (8) (12) (133)  
Mortgage-backed securities, U.S. GSEs and government agencies          
Assets:          
Fair value, beginning balance 397 519 449 797  
Total realized/unrealized gains/(losses) (33) (10) (10) (149)  
Purchases 1 5 7 24  
Sales (8) (5) (56) (121)  
Settlements (28) (40) (61) (82)  
Transfers into level 3 1 0 1 0  
Transfers (out of) level 3 (1) 0 (1) 0  
Fair value, ending balance 329 469 329 469  
Change in unrealized gains/(losses) related to financial instruments held (34) (8) (12) (139)  
Mortgage-backed securities, Residential - nonagency          
Assets:          
Fair value, beginning balance 32 24 28 23  
Total realized/unrealized gains/(losses) 0 0 1 (1)  
Purchases 6 2 15 4  
Sales (21) (2) (24) (2)  
Settlements (1) (1) (3) (1)  
Transfers into level 3 0 0 0 0  
Transfers (out of) level 3 0 0 (1) 0  
Fair value, ending balance 16 23 16 23  
Change in unrealized gains/(losses) related to financial instruments held 0 0 0 2  
Mortgage-backed securities, Commercial - nonagency          
Assets:          
Fair value, beginning balance 2 3 3 4  
Total realized/unrealized gains/(losses) 0 0 0 0  
Purchases 11 0 11 1  
Sales 0 0 (1) 0  
Settlements (3) 0 (3) (1)  
Transfers into level 3 0 0 0 1  
Transfers (out of) level 3 0 (1) 0 (3)  
Fair value, ending balance 10 2 10 2  
Change in unrealized gains/(losses) related to financial instruments held 1 0 0 4  
Total debt and equity instruments          
Assets:          
Fair value, beginning balance 2,682 3,555 2,623 2,685  
Total realized/unrealized gains/(losses) 20 105 62 (241)  
Purchases 693 233 1,512 1,189  
Sales (410) (229) (913) (599)  
Settlements (184) (160) (256) (232)  
Transfers into level 3 141 179 372 1,057  
Transfers (out of) level 3 (342) (554) (800) (730)  
Fair value, ending balance 2,600 3,129 2,600 3,129  
Change in unrealized gains/(losses) related to financial instruments held 32 155 46 (112)  
Total debt instruments          
Assets:          
Fair value, beginning balance 1,872 3,121 2,098 2,257  
Total realized/unrealized gains/(losses) 5 5 11 (302)  
Purchases 634 218 1,158 1,155  
Sales (383) (228) (843) (589)  
Settlements (158) (151) (201) (211)  
Transfers into level 3 114 104 291 900  
Transfers (out of) level 3 (221) (510) (651) (651)  
Fair value, ending balance 1,863 2,559 1,863 2,559  
Change in unrealized gains/(losses) related to financial instruments held (2) 15 5 (217)  
Obligations of U.S. states and municipalities          
Assets:          
Fair value, beginning balance 8 9 8 10  
Total realized/unrealized gains/(losses) 0 0 0 0  
Purchases 0 0 0 0  
Sales 0 0 0 (1)  
Settlements 0 (1) 0 (1)  
Transfers into level 3 0 0 0 0  
Transfers (out of) level 3 0 0 0 0  
Fair value, ending balance 8 8 8 8  
Change in unrealized gains/(losses) related to financial instruments held 0 0 0 0  
Non-U.S. government debt securities          
Assets:          
Fair value, beginning balance 177 175 182 155  
Total realized/unrealized gains/(losses) 1 16 (8) 4  
Purchases 84 49 202 139  
Sales (79) (68) (186) (125)  
Settlements 0 (5) (7) (5)  
Transfers into level 3 0 0 0 0  
Transfers (out of) level 3 0 0 0 (1)  
Fair value, ending balance 183 167 183 167  
Change in unrealized gains/(losses) related to financial instruments held (1) 14 (7) (6)  
Corporate debt securities          
Assets:          
Fair value, beginning balance 370 953 507 558  
Total realized/unrealized gains/(losses) 30 0 15 (55)  
Purchases 228 69 319 361  
Sales (154) (56) (300) (98)  
Settlements 0 (9) 0 (9)  
Transfers into level 3 28 65 113 292  
Transfers (out of) level 3 (15) (76) (167) (103)  
Fair value, ending balance 487 946 487 946  
Change in unrealized gains/(losses) related to financial instruments held 30 3 14 (11)  
Loans          
Assets:          
Fair value, beginning balance 832 1,386 893 673  
Total realized/unrealized gains/(losses) (1) 4 6 (94)  
Purchases 294 92 566 589  
Sales (85) (97) (237) (227)  
Settlements (125) (93) (126) (109)  
Transfers into level 3 85 39 175 607  
Transfers (out of) level 3 (205) (426) (482) (534)  
Fair value, ending balance 795 905 795 905  
Change in unrealized gains/(losses) related to financial instruments held 1 5 3 (67)  
Asset-backed securities          
Assets:          
Fair value, beginning balance 54 52 28 37  
Total realized/unrealized gains/(losses) 8 (5) 7 (7)  
Purchases 10 1 38 37  
Sales (36) 0 (39) (15)  
Settlements (1) (2) (1) (3)  
Transfers into level 3 0 0 2 0  
Transfers (out of) level 3 0 (7) 0 (10)  
Fair value, ending balance 35 39 35 39  
Change in unrealized gains/(losses) related to financial instruments held 1 1 7 0  
Equity securities          
Assets:          
Fair value, beginning balance 688 213 476 196  
Total realized/unrealized gains/(losses) 8 (65) 3 (103)  
Purchases 23 14 253 24  
Sales (27) (1) (70) (5)  
Settlements 0 0 0 0  
Transfers into level 3 24 73 78 155  
Transfers (out of) level 3 (26) (43) (50) (76)  
Fair value, ending balance 690 191 690 191  
Change in unrealized gains/(losses) related to financial instruments held 15 (44) 13 (79)  
Other          
Assets:          
Fair value, beginning balance 122 221 49 232  
Total realized/unrealized gains/(losses) 7 165 48 164  
Purchases 36 1 101 10  
Sales 0 0 0 (5)  
Settlements (26) (9) (55) (21)  
Transfers into level 3 3 2 3 2  
Transfers (out of) level 3 (95) (1) (99) (3)  
Fair value, ending balance 47 379 47 379  
Change in unrealized gains/(losses) related to financial instruments held 19 184 28 184  
Total available-for-sale securities          
Assets:          
Fair value, beginning balance   0   1  
Total realized/unrealized gains/(losses)   0   0  
Purchases   0   0  
Sales   0   0  
Settlements   0   (1)  
Transfers into level 3   0   0  
Transfers (out of) level 3   0   0  
Fair value, ending balance   0   0  
Change in unrealized gains/(losses) related to financial instruments held   0   0  
Mortgage-backed securities          
Assets:          
Fair value, beginning balance   0   1  
Total realized/unrealized gains/(losses)   0   0  
Purchases   0   0  
Sales   0   0  
Settlements   0   (1)  
Transfers into level 3   0   0  
Transfers (out of) level 3   0   0  
Fair value, ending balance   0   0  
Change in unrealized gains/(losses) related to financial instruments held   0   0  
Loans          
Assets:          
Fair value, beginning balance 1,823 2,085 2,305 516  
Total realized/unrealized gains/(losses) 7 (87) (66) (151)  
Purchases 240 62 307 253  
Sales (135) (1) (325) (33)  
Settlements (318) (345) (519) (354)  
Transfers into level 3 445 482 600 1,996  
Transfers (out of) level 3 (328) (322) (568) (353)  
Fair value, ending balance 1,734 1,874 1,734 1,874  
Change in unrealized gains/(losses) related to financial instruments held (11) (86) (72) (141)  
Mortgage servicing rights          
Assets:          
Fair value, beginning balance 4,470 3,267 3,276 4,699  
Total realized/unrealized gains/(losses) (528) (111) 269 (1,493)  
Purchases 814 169 1,397 442  
Sales (25) 2 (24) (73)  
Settlements (182) (247) (369) (495)  
Transfers into level 3 0 0 0 0  
Transfers (out of) level 3 0 0 0 0  
Fair value, ending balance 4,549 3,080 4,549 3,080  
Change in unrealized gains/(losses) related to financial instruments held (528) (111) 269 (1,493)  
Other assets          
Assets:          
Fair value, beginning balance 511 582 538 917  
Total realized/unrealized gains/(losses) 31 57 44 (35)  
Purchases 4 48 7 61  
Sales 0 0 (18) (28)  
Settlements (27) (26) (52) (254)  
Transfers into level 3 0 40 0 40  
Transfers (out of) level 3 (1) 0 (1) 0  
Fair value, ending balance 518 701 518 701  
Change in unrealized gains/(losses) related to financial instruments held $ 35 $ 57 $ 63 $ (37)