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Fair Value Measurement - Changes in Level 3 Recurring Measurements (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Net derivative receivables:      
Fair value, beginning balance $ (4,993) $ (4,489)  
Total realized/unrealized gains/(losses) 205 3,045  
Purchases 254 185  
Sales (1,152) (745)  
Settlements 9 304  
Transfers into level 3 173 (774)  
Transfers (out of) level 3 365 49  
Fair value, ending balance (5,139) (2,425)  
Change in unrealized gains/(losses) related to financial instruments held $ (91) 3,147  
Level 3 Rollforward Supplemental Data [Abstract]      
Level 3 assets as a percentage of total firm assets at fair value 1.00%   1.00%
Level 3 liabilities as a percentage of total firm liabilities at fair value 8.00%   9.00%
Deposits      
Liabilities:      
Fair value, beginning balance $ 2,913 3,360  
Total realized/unrealized (gains)/losses (103) (149)  
Purchases 0 0  
Sales 0 0  
Issuances 69 386  
Settlements (95) (172)  
Transfers into level 3 1 4  
Transfers (out of) level 3 (133) (250)  
Fair value, ending balance 2,652 3,179  
Change in unrealized (gains)/losses related to financials instruments held (105) (135)  
Short-term borrowings      
Liabilities:      
Fair value, beginning balance 2,420 1,674  
Total realized/unrealized (gains)/losses (113) (345)  
Purchases 0 0  
Sales 0 0  
Issuances 2,918 1,615  
Settlements (1,506) (929)  
Transfers into level 3 0 40  
Transfers (out of) level 3 (55) (16)  
Fair value, ending balance 3,664 2,039  
Change in unrealized (gains)/losses related to financials instruments held (27) (409)  
Total debt and equity instruments      
Liabilities:      
Fair value, beginning balance 51 41  
Total realized/unrealized (gains)/losses (3) 3  
Purchases (65) (75)  
Sales 21 7  
Issuances 0 0  
Settlements 0 0  
Transfers into level 3 59 86  
Transfers (out of) level 3 (3) (1)  
Fair value, ending balance 60 61  
Change in unrealized (gains)/losses related to financials instruments held 0 6  
Accounts payable and other liabilities      
Liabilities:      
Fair value, beginning balance 68 45  
Total realized/unrealized (gains)/losses (1) (8)  
Purchases 0 (23)  
Sales 1 1  
Issuances 0 0  
Settlements 0 0  
Transfers into level 3 0 0  
Transfers (out of) level 3 (7) 0  
Fair value, ending balance 61 15  
Change in unrealized (gains)/losses related to financials instruments held (1) (7)  
Beneficial interests issued by consolidated VIEs      
Liabilities:      
Fair value, beginning balance 0 0  
Total realized/unrealized (gains)/losses 0 0  
Purchases 0 0  
Sales 0 0  
Issuances 0 0  
Settlements 0 0  
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 financials instruments held 0 0  
Long-term debt      
Liabilities:      
Fair value, beginning balance 23,397 23,339  
Total realized/unrealized (gains)/losses (308) (4,110)  
Purchases 0 0  
Sales 0 0  
Issuances 3,465 4,607  
Settlements (3,649) (3,549)  
Transfers into level 3 11 370  
Transfers (out of) level 3 (341) (516)  
Fair value, ending balance 22,575 20,141  
Change in unrealized (gains)/losses related to financials instruments held (324) (3,984)  
DVA for fair value option elected liabilities      
Level 3 Rollforward Supplemental Data [Abstract]      
Unrealized (gains)/losses on liabilities recorded in OCI (22) (1,100)  
Interest rate      
Net derivative receivables:      
Fair value, beginning balance 258 (332)  
Total realized/unrealized gains/(losses) 445 642  
Purchases 53 66  
Sales (93) (50)  
Settlements (534) (241)  
Transfers into level 3 57 (172)  
Transfers (out of) level 3 (37) (49)  
Fair value, ending balance 149 (136)  
Change in unrealized gains/(losses) related to financial instruments held 313 282  
Credit      
Net derivative receivables:      
Fair value, beginning balance (224) (139)  
Total realized/unrealized gains/(losses) 183 108  
Purchases 1 18  
Sales (2) (128)  
Settlements 27 (33)  
Transfers into level 3 (3) 60  
Transfers (out of) level 3 14 3  
Fair value, ending balance (4) (111)  
Change in unrealized gains/(losses) related to financial instruments held 168 65  
Foreign exchange      
Net derivative receivables:      
Fair value, beginning balance (434) (607)  
Total realized/unrealized gains/(losses) (200) (339)  
Purchases 2 38  
Sales (6) (4)  
Settlements 111 (14)  
Transfers into level 3 10 0  
Transfers (out of) level 3 (22) (1)  
Fair value, ending balance (539) (927)  
Change in unrealized gains/(losses) related to financial instruments held (214) (508)  
Equity      
Net derivative receivables:      
Fair value, beginning balance (3,862) (3,395)  
Total realized/unrealized gains/(losses) 23 3,037  
Purchases 194 59  
Sales (838) (548)  
Settlements 126 583  
Transfers into level 3 110 (656)  
Transfers (out of) level 3 413 94  
Fair value, ending balance (3,834) (826)  
Change in unrealized gains/(losses) related to financial instruments held (213) 3,707  
Commodity      
Net derivative receivables:      
Fair value, beginning balance (731) (16)  
Total realized/unrealized gains/(losses) (246) (403)  
Purchases 4 4  
Sales (213) (15)  
Settlements 279 9  
Transfers into level 3 (1) (6)  
Transfers (out of) level 3 (3) 2  
Fair value, ending balance (911) (425)  
Change in unrealized gains/(losses) related to financial instruments held (145) (399)  
Total mortgage-backed securities      
Assets:      
Fair value, beginning balance 480 824  
Total realized/unrealized gains/(losses) 24 (140)  
Purchases 15 22  
Sales (52) (116)  
Settlements (35) (43)  
Transfers into level 3 0 1  
Transfers (out of) level 3 (1) (2)  
Fair value, ending balance 431 546  
Change in unrealized gains/(losses) related to financial instruments held 22 (132)  
Mortgage-backed securities, U.S. GSEs and government agencies      
Assets:      
Fair value, beginning balance 449 797  
Total realized/unrealized gains/(losses) 23 (139)  
Purchases 6 19  
Sales (48) (116)  
Settlements (33) (42)  
Transfers into level 3 0  
Transfers (out of) level 3 0 0  
Fair value, ending balance 397 519  
Change in unrealized gains/(losses) related to financial instruments held 22 (131)  
Mortgage-backed securities, Residential - nonagency      
Assets:      
Fair value, beginning balance 28 23  
Total realized/unrealized gains/(losses) 1 (1)  
Purchases 9 2  
Sales (3) 0  
Settlements (2) 0  
Transfers into level 3 0  
Transfers (out of) level 3 (1) 0  
Fair value, ending balance 32 24  
Change in unrealized gains/(losses) related to financial instruments held 0 (1)  
Mortgage-backed securities, Commercial - nonagency      
Assets:      
Fair value, beginning balance 3 4  
Total realized/unrealized gains/(losses) 0 0  
Purchases 0 1  
Sales (1) 0  
Settlements 0 (1)  
Transfers into level 3 1  
Transfers (out of) level 3 0 (2)  
Fair value, ending balance 2 3  
Change in unrealized gains/(losses) related to financial instruments held 0 0  
Total debt and equity instruments      
Assets:      
Fair value, beginning balance 2,623 2,685  
Total realized/unrealized gains/(losses) 42 (346)  
Purchases 819 956  
Sales (503) (370)  
Settlements (72) (72)  
Transfers into level 3 231 878  
Transfers (out of) level 3 (458) (176)  
Fair value, ending balance 2,682 3,555  
Change in unrealized gains/(losses) related to financial instruments held 45 (357)  
Total debt instruments      
Assets:      
Fair value, beginning balance 2,098 2,257  
Total realized/unrealized gains/(losses) 6 (307)  
Purchases 524 937  
Sales (460) (361)  
Settlements (43) (60)  
Transfers into level 3 177 796  
Transfers (out of) level 3 (430) (141)  
Fair value, ending balance 1,872 3,121  
Change in unrealized gains/(losses) related to financial instruments held 6 (320)  
Obligations of U.S. states and municipalities      
Assets:      
Fair value, beginning balance 8 10  
Total realized/unrealized gains/(losses) 0 0  
Purchases 0 0  
Sales 0 (1)  
Settlements 0 0  
Transfers into level 3 0 0  
Transfers (out of) level 3 0 0  
Fair value, ending balance 8 9  
Change in unrealized gains/(losses) related to financial instruments held 0 0  
Non-U.S. government debt securities      
Assets:      
Fair value, beginning balance 182 155  
Total realized/unrealized gains/(losses) (9) (12)  
Purchases 118 90  
Sales (107) (57)  
Settlements (7) 0  
Transfers into level 3 0 0  
Transfers (out of) level 3 0 (1)  
Fair value, ending balance 177 175  
Change in unrealized gains/(losses) related to financial instruments held (9) (10)  
Corporate debt securities      
Assets:      
Fair value, beginning balance 507 558  
Total realized/unrealized gains/(losses) (15) (55)  
Purchases 91 292  
Sales (146) (42)  
Settlements 0 0  
Transfers into level 3 85 227  
Transfers (out of) level 3 (152) (27)  
Fair value, ending balance 370 953  
Change in unrealized gains/(losses) related to financial instruments held (14) (50)  
Loans      
Assets:      
Fair value, beginning balance 893 673  
Total realized/unrealized gains/(losses) 7 (98)  
Purchases 272 497  
Sales (152) (130)  
Settlements (1) (16)  
Transfers into level 3 90 568  
Transfers (out of) level 3 (277) (108)  
Fair value, ending balance 832 1,386  
Change in unrealized gains/(losses) related to financial instruments held 8 (127)  
Asset-backed securities      
Assets:      
Fair value, beginning balance 28 37  
Total realized/unrealized gains/(losses) (1) (2)  
Purchases 28 36  
Sales (3) (15)  
Settlements 0 (1)  
Transfers into level 3 2 0  
Transfers (out of) level 3 0 (3)  
Fair value, ending balance 54 52  
Change in unrealized gains/(losses) related to financial instruments held (1) (1)  
Equity securities      
Assets:      
Fair value, beginning balance 476 196  
Total realized/unrealized gains/(losses) (5) (38)  
Purchases 230 10  
Sales (43) (4)  
Settlements 0 0  
Transfers into level 3 54 82  
Transfers (out of) level 3 (24) (33)  
Fair value, ending balance 688 213  
Change in unrealized gains/(losses) related to financial instruments held 3 (39)  
Other      
Assets:      
Fair value, beginning balance 49 232  
Total realized/unrealized gains/(losses) 41 (1)  
Purchases 65 9  
Sales 0 (5)  
Settlements (29) (12)  
Transfers into level 3 0 0  
Transfers (out of) level 3 (4) (2)  
Fair value, ending balance 122 221  
Change in unrealized gains/(losses) related to financial instruments held 36 2  
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 2,305 516  
Total realized/unrealized gains/(losses) (73) (64)  
Purchases 67 191  
Sales (190) (32)  
Settlements (201) (9)  
Transfers into level 3 155 1,514  
Transfers (out of) level 3 (240) (31)  
Fair value, ending balance 1,823 2,085  
Change in unrealized gains/(losses) related to financial instruments held (112) (63)  
Mortgage servicing rights      
Assets:      
Fair value, beginning balance 3,276 4,699  
Total realized/unrealized gains/(losses) 797 (1,382)  
Purchases 583 273  
Sales 1 (75)  
Settlements (187) (248)  
Transfers into level 3 0 0  
Transfers (out of) level 3 0 0  
Fair value, ending balance 4,470 3,267  
Change in unrealized gains/(losses) related to financial instruments held 797 (1,382)  
Other assets      
Assets:      
Fair value, beginning balance 538 917  
Total realized/unrealized gains/(losses) 13 (92)  
Purchases 3 13  
Sales (18) (28)  
Settlements (25) (228)  
Transfers into level 3 0 0  
Transfers (out of) level 3 0 0  
Fair value, ending balance 511 582  
Change in unrealized gains/(losses) related to financial instruments held $ 12 $ (91)