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Fair Value Measurement - Changes in Level 3 Recurring Measurements (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Dec. 31, 2023
Net derivative receivables:      
Fair value, beginning balance $ (1,852) $ 673  
Total realized/unrealized gains/(losses) (1,178) 860  
Purchases 418 388  
Sales (772) (848)  
Settlements 714 (53)  
Transfers into level 3 23 35  
Transfers (out of) level 3 447 (476)  
Fair value, ending balance (2,200) 579  
Change in unrealized gains/(losses) related to financial instruments held $ (869) 1,103  
Level 3 Rollforward Supplemental Data      
Level 3 assets as a percentage of total firm assets at fair value 2.00%   2.00%
Level 3 liabilities as a percentage of total firm liabilities at fair value 6.00%   8.00%
Deposits      
Liabilities:      
Fair value, beginning balance $ 1,833 2,162  
Total realized/unrealized (gains)/losses (29) 48  
Purchases 0 0  
Sales 0 0  
Issuances 527 128  
Settlements (203) (67)  
Transfers into level 3 0 0  
Transfers (out of) level 3 (73) (63)  
Fair value, ending balance 2,055 2,208  
Change in unrealized (gains)/losses related to financials instruments held (25) 48  
Short-term borrowings      
Liabilities:      
Fair value, beginning balance 1,758 1,401  
Total realized/unrealized (gains)/losses 1 90  
Purchases 0 0  
Sales 0 0  
Issuances 1,645 1,051  
Settlements (1,197) (1,132)  
Transfers into level 3 0 0  
Transfers (out of) level 3 (1) 0  
Fair value, ending balance 2,206 1,410  
Change in unrealized (gains)/losses related to financials instruments held 8 20  
Total debt and equity instruments      
Liabilities:      
Fair value, beginning balance 37 84  
Total realized/unrealized (gains)/losses (3) (12)  
Purchases (1) (27)  
Sales 2 8  
Issuances 0 0  
Settlements 0 0  
Transfers into level 3 3 12  
Transfers (out of) level 3 (1) (2)  
Fair value, ending balance 37 63  
Change in unrealized (gains)/losses related to financials instruments held (2) 1  
Accounts payable and other liabilities      
Liabilities:      
Fair value, beginning balance 52 53  
Total realized/unrealized (gains)/losses (4) (1)  
Purchases (3) 0  
Sales 3 4  
Issuances 0 0  
Settlements 0 0  
Transfers into level 3 0 0  
Transfers (out of) level 3 0 0  
Fair value, ending balance 48 56  
Change in unrealized (gains)/losses related to financials instruments held (4) (1)  
Long-term debt      
Liabilities:      
Fair value, beginning balance 27,726 24,092  
Total realized/unrealized (gains)/losses 551 1,356  
Purchases 0 0  
Sales 0 0  
Issuances 4,503 2,733  
Settlements (3,851) (2,975)  
Transfers into level 3 17 91  
Transfers (out of) level 3 (268) (70)  
Fair value, ending balance 28,678 25,227  
Change in unrealized (gains)/losses related to financials instruments held 500 1,447  
Interest rate      
Net derivative receivables:      
Fair value, beginning balance 502 701  
Total realized/unrealized gains/(losses) (328) 346  
Purchases 53 35  
Sales (43) (50)  
Settlements 484 (22)  
Transfers into level 3 129 (165)  
Transfers (out of) level 3 3 (91)  
Fair value, ending balance 800 754  
Change in unrealized gains/(losses) related to financial instruments held (399) 461  
Credit      
Net derivative receivables:      
Fair value, beginning balance 265 13  
Total realized/unrealized gains/(losses) (25) 246  
Purchases 0 3  
Sales (15) (3)  
Settlements 14 171  
Transfers into level 3 (6) 24  
Transfers (out of) level 3 27 (2)  
Fair value, ending balance 260 452  
Change in unrealized gains/(losses) related to financial instruments held 87 239  
Foreign exchange      
Net derivative receivables:      
Fair value, beginning balance 62 489  
Total realized/unrealized gains/(losses) 3 89  
Purchases 34 28  
Sales (38) (41)  
Settlements (122) (75)  
Transfers into level 3 (53) 64  
Transfers (out of) level 3 138 (9)  
Fair value, ending balance 24 545  
Change in unrealized gains/(losses) related to financial instruments held 67 126  
Equity      
Net derivative receivables:      
Fair value, beginning balance (2,402) (384)  
Total realized/unrealized gains/(losses) (652) 171  
Purchases 321 318  
Sales (608) (687)  
Settlements 331 0  
Transfers into level 3 (49) 111  
Transfers (out of) level 3 278 (414)  
Fair value, ending balance (2,781) (885)  
Change in unrealized gains/(losses) related to financial instruments held (442) 308  
Commodity      
Net derivative receivables:      
Fair value, beginning balance (279) (146)  
Total realized/unrealized gains/(losses) (176) 8  
Purchases 10 4  
Sales (68) (67)  
Settlements 7 (127)  
Transfers into level 3 2 1  
Transfers (out of) level 3 1 40  
Fair value, ending balance (503) (287)  
Change in unrealized gains/(losses) related to financial instruments held (182) (31)  
Federal funds sold and securities purchased under resale agreements      
Assets:      
Fair value, beginning balance 0 0  
Total realized/unrealized gains/(losses) 0 0  
Purchases 0 0  
Sales 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 financial instruments held 0 0  
Total mortgage-backed securities      
Assets:      
Fair value, beginning balance 775 771  
Total realized/unrealized gains/(losses) (1) 9  
Purchases 2 25  
Sales (17) (7)  
Settlements (21) (27)  
Transfers into level 3 11 4  
Transfers (out of) level 3 0 (3)  
Fair value, ending balance 749 772  
Change in unrealized gains/(losses) related to financial instruments held (1) 9  
Mortgage-backed securities, U.S. GSEs and government agencies      
Assets:      
Fair value, beginning balance 758 759  
Total realized/unrealized gains/(losses) 1 7  
Purchases 1 25  
Sales (17) (7)  
Settlements (21) (24)  
Transfers into level 3 7 0  
Transfers (out of) level 3 0 (3)  
Fair value, ending balance 729 757  
Change in unrealized gains/(losses) related to financial instruments held 1 7  
Mortgage-backed securities, Residential - nonagency      
Assets:      
Fair value, beginning balance 5 5  
Total realized/unrealized gains/(losses) (1) 1  
Purchases 0 0  
Sales 0 0  
Settlements 0 (2)  
Transfers into level 3 4 1  
Transfers (out of) level 3 0 0  
Fair value, ending balance 8 5  
Change in unrealized gains/(losses) related to financial instruments held (1) 1  
Mortgage-backed securities, Commercial - nonagency      
Assets:      
Fair value, beginning balance 12 7  
Total realized/unrealized gains/(losses) (1) 1  
Purchases 1 0  
Sales 0 0  
Settlements 0 (1)  
Transfers into level 3 0 3  
Transfers (out of) level 3 0 0  
Fair value, ending balance 12 10  
Change in unrealized gains/(losses) related to financial instruments held (1) 1  
Total debt and equity instruments      
Assets:      
Fair value, beginning balance 2,373 2,909  
Total realized/unrealized gains/(losses) 35 0  
Purchases 519 713  
Sales (408) (207)  
Settlements (119) (123)  
Transfers into level 3 115 88  
Transfers (out of) level 3 (159) (241)  
Fair value, ending balance 2,356 3,139  
Change in unrealized gains/(losses) related to financial instruments held 21 49  
Obligations of U.S. states and municipalities      
Assets:      
Fair value, beginning balance 10 7  
Total realized/unrealized gains/(losses) 0 0  
Purchases 0 0  
Sales 0 (1)  
Settlements (2) 0  
Transfers into level 3 0 0  
Transfers (out of) level 3 (1) 0  
Fair value, ending balance 7 6  
Change in unrealized gains/(losses) related to financial instruments held 0 0  
Non-U.S. government debt securities      
Assets:      
Fair value, beginning balance 179 155  
Total realized/unrealized gains/(losses) 5 11  
Purchases 51 50  
Sales (67) (47)  
Settlements 0 0  
Transfers into level 3 7 0  
Transfers (out of) level 3 (2) 0  
Fair value, ending balance 173 169  
Change in unrealized gains/(losses) related to financial instruments held (4) 13  
Corporate debt securities      
Assets:      
Fair value, beginning balance 484 463  
Total realized/unrealized gains/(losses) 11 24  
Purchases 214 49  
Sales (95) (17)  
Settlements (30) 0  
Transfers into level 3 4 23  
Transfers (out of) level 3 (18) (4)  
Fair value, ending balance 570 538  
Change in unrealized gains/(losses) related to financial instruments held 12 20  
Loans      
Assets:      
Fair value, beginning balance 684 759  
Total realized/unrealized gains/(losses) 5 8  
Purchases 143 436  
Sales (199) (62)  
Settlements (31) (95)  
Transfers into level 3 62 23  
Transfers (out of) level 3 (133) (143)  
Fair value, ending balance 531 926  
Change in unrealized gains/(losses) related to financial instruments held 5 8  
Asset-backed securities      
Assets:      
Fair value, beginning balance 6 23  
Total realized/unrealized gains/(losses) 0 0  
Purchases 1 1  
Sales 0 (2)  
Settlements 0 (1)  
Transfers into level 3 7 1  
Transfers (out of) level 3 0 (15)  
Fair value, ending balance 14 7  
Change in unrealized gains/(losses) related to financial instruments held 0 0  
Equity securities      
Assets:      
Fair value, beginning balance 127 665  
Total realized/unrealized gains/(losses) 6 (31)  
Purchases 81 58  
Sales (30) (71)  
Settlements 0 0  
Transfers into level 3 24 36  
Transfers (out of) level 3 (5) (76)  
Fair value, ending balance 203 581  
Change in unrealized gains/(losses) related to financial instruments held 7 (2)  
Physical commodities      
Assets:      
Fair value, beginning balance 7 2  
Total realized/unrealized gains/(losses) (2) 0  
Purchases 0 0  
Sales 0 0  
Settlements (3) (2)  
Transfers into level 3 0 0  
Transfers (out of) level 3 0 0  
Fair value, ending balance 2 0  
Change in unrealized gains/(losses) related to financial instruments held (2) 0  
Other      
Assets:      
Fair value, beginning balance 101 64  
Total realized/unrealized gains/(losses) 11 (21)  
Purchases 27 94  
Sales 0 0  
Settlements (32) 2  
Transfers into level 3 0 1  
Transfers (out of) level 3 0 0  
Fair value, ending balance 107 140  
Change in unrealized gains/(losses) related to financial instruments held 4 1  
Total available-for-sale securities      
Assets:      
Fair value, beginning balance 0 239  
Total realized/unrealized gains/(losses) 0 11  
Purchases 0 0  
Sales 0 0  
Settlements 0 0  
Transfers into level 3 0 0  
Transfers (out of) level 3 0 0  
Fair value, ending balance 0 250  
Change in unrealized gains/(losses) related to financial instruments held 0 11  
Corporate debt securities      
Assets:      
Fair value, beginning balance 0 239  
Total realized/unrealized gains/(losses) 0 11  
Purchases 0 0  
Sales 0 0  
Settlements 0 0  
Transfers into level 3 0 0  
Transfers (out of) level 3 0 0  
Fair value, ending balance 0 250  
Change in unrealized gains/(losses) related to financial instruments held 0 11  
Loans      
Assets:      
Fair value, beginning balance 3,079 1,418  
Total realized/unrealized gains/(losses) 37 26  
Purchases 60 148  
Sales (22) (66)  
Settlements (392) (95)  
Transfers into level 3 303 157  
Transfers (out of) level 3 (164) (109)  
Fair value, ending balance 2,901 1,479  
Change in unrealized gains/(losses) related to financial instruments held 35 16  
Mortgage servicing rights      
Assets:      
Fair value, beginning balance 8,522 7,973  
Total realized/unrealized gains/(losses) 278 (11)  
Purchases 60 31  
Sales 5 2  
Settlements (260) (240)  
Transfers into level 3 0 0  
Transfers (out of) level 3 0 0  
Fair value, ending balance 8,605 7,755  
Change in unrealized gains/(losses) related to financial instruments held 278 (11)  
Other assets      
Assets:      
Fair value, beginning balance 758 405  
Total realized/unrealized gains/(losses) 29 5  
Purchases 47 12  
Sales (9) 0  
Settlements (14) (16)  
Transfers into level 3 0 0  
Transfers (out of) level 3 0 0  
Fair value, ending balance 811 406  
Change in unrealized gains/(losses) related to financial instruments held 28 5  
Total debt instruments      
Assets:      
Fair value, beginning balance 2,138 2,178  
Total realized/unrealized gains/(losses) 20 52  
Purchases 411 561  
Sales (378) (136)  
Settlements (84) (123)  
Transfers into level 3 91 51  
Transfers (out of) level 3 (154) (165)  
Fair value, ending balance 2,044 2,418  
Change in unrealized gains/(losses) related to financial instruments held $ 12 $ 50