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Fair Value Measurement - Changes in Level 3 Recurring Measurements (Details) - USD ($)
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Net derivative receivables:      
Beginning balance $ (4,489,000,000) $ (3,796,000,000) $ (4,250,000,000)
Total realized/unrealized gains/(losses) 1,908,000,000 (794,000,000) 338,000,000
Purchases 2,121,000,000 579,000,000 1,841,000,000
Sales (2,884,000,000) (1,122,000,000) (2,440,000,000)
Settlements (446,000,000) (89,000,000) 1,047,000,000
Transfers into level 3 (1,505,000,000) (411,000,000) (729,000,000)
Transfers (out of) level 3 302,000,000 1,144,000,000 397,000,000
Ending balance (4,993,000,000) (4,489,000,000) (3,796,000,000)
Change in unrealized gains/(losses) related to financial instruments held $ 42,000,000 $ (2,584,000,000) $ 803,000,000
Level 3 Rollforward Supplemental Data [Abstract]      
Level 3 assets as a percentage of total firm assets at fair value 1.00% 2.00% 3.00%
Level 3 liabilities as a percentage of total firm liabilities at fair value 9.00% 16.00% 15.00%
Deposits      
Liabilities:      
Beginning balance $ 3,360,000,000 $ 4,169,000,000 $ 4,142,000,000
Total realized/unrealized (gains)/losses 165,000,000 278,000,000 (136,000,000)
Purchases 0 0 0
Sales 0 0 0
Issuances 671,000,000 916,000,000 1,437,000,000
Settlements (605,000,000) (806,000,000) (736,000,000)
Transfers into level 3 265,000,000 12,000,000 2,000,000
Transfers (out of) level 3 (943,000,000) (1,209,000,000) (540,000,000)
Ending balance 2,913,000,000 3,360,000,000 4,169,000,000
Change in unrealized (gains)/losses related to financials instruments held 455,000,000 307,000,000 (204,000,000)
Short-term borrowings      
Liabilities:      
Beginning balance 1,674,000,000 1,523,000,000 1,665,000,000
Total realized/unrealized (gains)/losses (338,000,000) 229,000,000 (329,000,000)
Purchases 0 0 0
Sales 0 0 0
Issuances 5,140,000,000 3,441,000,000 3,455,000,000
Settlements (4,115,000,000) (3,356,000,000) (3,388,000,000)
Transfers into level 3 105,000,000 85,000,000 272,000,000
Transfers (out of) level 3 (46,000,000) (248,000,000) (152,000,000)
Ending balance 2,420,000,000 1,674,000,000 1,523,000,000
Change in unrealized (gains)/losses related to financials instruments held 143,000,000 155,000,000 (131,000,000)
Total debt and equity instruments      
Liabilities:      
Beginning balance 41,000,000 50,000,000 39,000,000
Total realized/unrealized (gains)/losses (2,000,000) 2,000,000 19,000,000
Purchases (126,000,000) (22,000,000) (99,000,000)
Sales 14,000,000 41,000,000 114,000,000
Issuances 0 0 0
Settlements (4,000,000) 1,000,000 (1,000,000)
Transfers into level 3 136,000,000 16,000,000 14,000,000
Transfers (out of) level 3 (8,000,000) (47,000,000) (36,000,000)
Ending balance 51,000,000 41,000,000 50,000,000
Change in unrealized (gains)/losses related to financials instruments held (1,000,000) 3,000,000 16,000,000
Accounts payable and other liabilities      
Liabilities:      
Beginning balance 45,000,000 10,000,000 13,000,000
Total realized/unrealized (gains)/losses 33,000,000 (2,000,000) 0
Purchases (87,000,000) (84,000,000) (12,000,000)
Sales 37,000,000 115,000,000 5,000,000
Issuances 0 0 0
Settlements 0 0 0
Transfers into level 3 47,000,000 6,000,000 4,000,000
Transfers (out of) level 3 (7,000,000) 0 0
Ending balance 68,000,000 45,000,000 10,000,000
Change in unrealized (gains)/losses related to financials instruments held 28,000,000 29,000,000 0
Beneficial interests issued by consolidated VIEs      
Liabilities:      
Beginning balance 0 1,000,000 39,000,000
Total realized/unrealized (gains)/losses 0 (1,000,000) 0
Purchases 0 0 0
Sales 0 0 1,000,000
Issuances 0 0 0
Settlements 0 0 (39,000,000)
Transfers into level 3 0 0 0
Transfers (out of) level 3 0 0 0
Ending balance 0 0 1,000,000
Change in unrealized (gains)/losses related to financials instruments held 0 0 0
Long-term debt      
Liabilities:      
Beginning balance 23,339,000,000 19,418,000,000 16,125,000,000
Total realized/unrealized (gains)/losses 40,000,000 2,815,000,000 (1,169,000,000)
Purchases 0 0 0
Sales 0 0 0
Issuances 9,883,000,000 10,441,000,000 11,919,000,000
Settlements (9,833,000,000) (8,538,000,000) (7,769,000,000)
Transfers into level 3 1,250,000,000 651,000,000 1,143,000,000
Transfers (out of) level 3 (1,282,000,000) (1,448,000,000) (831,000,000)
Ending balance 23,397,000,000 23,339,000,000 19,418,000,000
Change in unrealized (gains)/losses related to financials instruments held 1,920,000,000 2,822,000,000 (1,385,000,000)
DVA for fair value option elected liabilities      
Level 3 Rollforward Supplemental Data [Abstract]      
Unrealized (gains)/losses on liabilities recorded in OCI 221,000,000 319,000,000 (277,000,000)
Interest rate      
Net derivative receivables:      
Beginning balance (332,000,000) (38,000,000) 264,000,000
Total realized/unrealized gains/(losses) 2,682,000,000 (394,000,000) 150,000,000
Purchases 308,000,000 109,000,000 107,000,000
Sales (148,000,000) (125,000,000) (133,000,000)
Settlements (2,228,000,000) 5,000,000 (430,000,000)
Transfers into level 3 (332,000,000) (7,000,000) (15,000,000)
Transfers (out of) level 3 308,000,000 118,000,000 19,000,000
Ending balance 258,000,000 (332,000,000) (38,000,000)
Change in unrealized gains/(losses) related to financial instruments held 325,000,000 (599,000,000) 187,000,000
Credit      
Net derivative receivables:      
Beginning balance (139,000,000) (107,000,000) (35,000,000)
Total realized/unrealized gains/(losses) (212,000,000) (36,000,000) (40,000,000)
Purchases 73,000,000 20,000,000 5,000,000
Sales (154,000,000) (9,000,000) (7,000,000)
Settlements 181,000,000 8,000,000 (57,000,000)
Transfers into level 3 59,000,000 29,000,000 4,000,000
Transfers (out of) level 3 (32,000,000) (44,000,000) 23,000,000
Ending balance (224,000,000) (139,000,000) (107,000,000)
Change in unrealized gains/(losses) related to financial instruments held (110,000,000) (127,000,000) (28,000,000)
Foreign exchange      
Net derivative receivables:      
Beginning balance (607,000,000) (297,000,000) (396,000,000)
Total realized/unrealized gains/(losses) 49,000,000 (551,000,000) 103,000,000
Purchases 49,000,000 17,000,000 52,000,000
Sales (24,000,000) (67,000,000) (20,000,000)
Settlements 83,000,000 312,000,000 30,000,000
Transfers into level 3 13,000,000 (22,000,000) (108,000,000)
Transfers (out of) level 3 3,000,000 1,000,000 42,000,000
Ending balance (434,000,000) (607,000,000) (297,000,000)
Change in unrealized gains/(losses) related to financial instruments held 116,000,000 (380,000,000) (63,000,000)
Equity      
Net derivative receivables:      
Beginning balance (3,395,000,000) (2,225,000,000) (3,409,000,000)
Total realized/unrealized gains/(losses) (65,000,000) (310,000,000) 198,000,000
Purchases 1,664,000,000 397,000,000 1,676,000,000
Sales (2,317,000,000) (573,000,000) (2,208,000,000)
Settlements 1,162,000,000 (503,000,000) 1,805,000,000
Transfers into level 3 (935,000,000) (405,000,000) (617,000,000)
Transfers (out of) level 3 24,000,000 224,000,000 330,000,000
Ending balance (3,862,000,000) (3,395,000,000) (2,225,000,000)
Change in unrealized gains/(losses) related to financial instruments held (556,000,000) (1,608,000,000) 561,000,000
Commodity      
Net derivative receivables:      
Beginning balance (16,000,000) (1,129,000,000) (674,000,000)
Total realized/unrealized gains/(losses) (546,000,000) 497,000,000 (73,000,000)
Purchases 27,000,000 36,000,000 1,000,000
Sales (241,000,000) (348,000,000) (72,000,000)
Settlements 356,000,000 89,000,000 (301,000,000)
Transfers into level 3 (310,000,000) (6,000,000) 7,000,000
Transfers (out of) level 3 (1,000,000) 845,000,000 (17,000,000)
Ending balance (731,000,000) (16,000,000) (1,129,000,000)
Change in unrealized gains/(losses) related to financial instruments held 267,000,000 130,000,000 146,000,000
Mortgage-backed securities      
Assets:      
Fair value, beginning balance 824,000,000 624,000,000 378,000,000
Total realized/unrealized gains/(losses) (170,000,000) (35,000,000) (23,000,000)
Purchases 150,000,000 876,000,000 574,000,000
Sales (154,000,000) (422,000,000) (232,000,000)
Settlements (166,000,000) (168,000,000) (97,000,000)
Transfers into level 3 2,000,000 31,000,000 189,000,000
Transfers (out of) level 3 (6,000,000) (82,000,000) (165,000,000)
Fair value, ending balance 480,000,000 824,000,000 624,000,000
Change in unrealized gains/(losses) related to financial instruments held (151,000,000) (55,000,000) (22,000,000)
Mortgage-backed securities, U.S. GSEs and government agencies      
Assets:      
Fair value, beginning balance 797,000,000 549,000,000 307,000,000
Total realized/unrealized gains/(losses) (172,000,000) (62,000,000) (23,000,000)
Purchases 134,000,000 773,000,000 478,000,000
Sales (149,000,000) (310,000,000) (164,000,000)
Settlements (161,000,000) (134,000,000) (73,000,000)
Transfers into level 3 0 1,000,000 94,000,000
Transfers (out of) level 3 0 (20,000,000) (70,000,000)
Fair value, ending balance 449,000,000 797,000,000 549,000,000
Change in unrealized gains/(losses) related to financial instruments held (150,000,000) (58,000,000) (21,000,000)
Mortgage-backed securities, Residential - nonagency      
Assets:      
Fair value, beginning balance 23,000,000 64,000,000 60,000,000
Total realized/unrealized gains/(losses) 2,000,000 25,000,000 (2,000,000)
Purchases 15,000,000 83,000,000 78,000,000
Sales (5,000,000) (86,000,000) (50,000,000)
Settlements (4,000,000) (20,000,000) (7,000,000)
Transfers into level 3 0 15,000,000 59,000,000
Transfers (out of) level 3 (3,000,000) (58,000,000) (74,000,000)
Fair value, ending balance 28,000,000 23,000,000 64,000,000
Change in unrealized gains/(losses) related to financial instruments held (1,000,000) 2,000,000 1,000,000
Mortgage-backed securities, Commercial - nonagency      
Assets:      
Fair value, beginning balance 4,000,000 11,000,000 11,000,000
Total realized/unrealized gains/(losses) 0 2,000,000 2,000,000
Purchases 1,000,000 20,000,000 18,000,000
Sales 0 (26,000,000) (18,000,000)
Settlements (1,000,000) (14,000,000) (17,000,000)
Transfers into level 3 2,000,000 15,000,000 36,000,000
Transfers (out of) level 3 (3,000,000) (4,000,000) (21,000,000)
Fair value, ending balance 3,000,000 4,000,000 11,000,000
Change in unrealized gains/(losses) related to financial instruments held 0 1,000,000 (2,000,000)
Total debt and equity instruments      
Assets:      
Fair value, beginning balance 2,685,000,000 3,200,000,000 3,263,000,000
Total realized/unrealized gains/(losses) (52,000,000) (22,000,000) (376,000,000)
Purchases 2,467,000,000 2,289,000,000 2,721,000,000
Sales (1,514,000,000) (1,856,000,000) (1,625,000,000)
Settlements (756,000,000) (426,000,000) (630,000,000)
Transfers into level 3 1,754,000,000 805,000,000 1,248,000,000
Transfers (out of) level 3 (1,961,000,000) (1,305,000,000) (1,401,000,000)
Fair value, ending balance 2,623,000,000 2,685,000,000 3,200,000,000
Change in unrealized gains/(losses) related to financial instruments held (23,000,000) 85,000,000 (332,000,000)
Total debt instruments      
Assets:      
Fair value, beginning balance 2,257,000,000 2,667,000,000 2,278,000,000
Total realized/unrealized gains/(losses) (248,000,000) 55,000,000 (51,000,000)
Purchases 2,169,000,000 2,181,000,000 2,548,000,000
Sales (1,129,000,000) (1,727,000,000) (1,465,000,000)
Settlements (601,000,000) (350,000,000) (511,000,000)
Transfers into level 3 1,213,000,000 622,000,000 1,138,000,000
Transfers (out of) level 3 (1,563,000,000) (1,191,000,000) (1,270,000,000)
Fair value, ending balance 2,098,000,000 2,257,000,000 2,667,000,000
Change in unrealized gains/(losses) related to financial instruments held (209,000,000) 12,000,000 (40,000,000)
U.S. Treasury, GSEs and government agencies      
Assets:      
Fair value, beginning balance 0 0 1,000,000
Total realized/unrealized gains/(losses) 0 0 0
Purchases 0 0 0
Sales 0 0 0
Settlements 0 0 0
Transfers into level 3 0 0 0
Transfers (out of) level 3 0 0 (1,000,000)
Fair value, ending balance 0 0 0
Change in unrealized gains/(losses) related to financial instruments held 0 0 0
Obligations of U.S. states and municipalities      
Assets:      
Fair value, beginning balance 10,000,000 689,000,000 744,000,000
Total realized/unrealized gains/(losses) 0 13,000,000 (17,000,000)
Purchases 0 85,000,000 112,000,000
Sales (1,000,000) (159,000,000) (70,000,000)
Settlements (1,000,000) (8,000,000) (80,000,000)
Transfers into level 3 0 0 0
Transfers (out of) level 3 0 (610,000,000) 0
Fair value, ending balance 8,000,000 10,000,000 689,000,000
Change in unrealized gains/(losses) related to financial instruments held 0 13,000,000 (17,000,000)
Non-U.S. government debt securities      
Assets:      
Fair value, beginning balance 155,000,000 155,000,000 78,000,000
Total realized/unrealized gains/(losses) 21,000,000 1,000,000 (22,000,000)
Purchases 281,000,000 290,000,000 459,000,000
Sales (245,000,000) (287,000,000) (277,000,000)
Settlements (7,000,000) 0 (12,000,000)
Transfers into level 3 0 14,000,000 23,000,000
Transfers (out of) level 3 (23,000,000) (18,000,000) (94,000,000)
Fair value, ending balance 182,000,000 155,000,000 155,000,000
Change in unrealized gains/(losses) related to financial instruments held 11,000,000 4,000,000 (9,000,000)
Corporate debt securities      
Assets:      
Fair value, beginning balance 558,000,000 334,000,000 312,000,000
Total realized/unrealized gains/(losses) (23,000,000) 47,000,000 (18,000,000)
Purchases 582,000,000 437,000,000 364,000,000
Sales (205,000,000) (247,000,000) (309,000,000)
Settlements (236,000,000) (52,000,000) (48,000,000)
Transfers into level 3 411,000,000 112,000,000 262,000,000
Transfers (out of) level 3 (580,000,000) (73,000,000) (229,000,000)
Fair value, ending balance 507,000,000 558,000,000 334,000,000
Change in unrealized gains/(losses) related to financial instruments held (25,000,000) 40,000,000 (1,000,000)
Loans      
Assets:      
Fair value, beginning balance 673,000,000 738,000,000 612,000,000
Total realized/unrealized gains/(losses) (73,000,000) 29,000,000 1,000,000
Purchases 1,112,000,000 456,000,000 941,000,000
Sales (484,000,000) (519,000,000) (536,000,000)
Settlements (182,000,000) (82,000,000) (219,000,000)
Transfers into level 3 791,000,000 437,000,000 619,000,000
Transfers (out of) level 3 (944,000,000) (386,000,000) (680,000,000)
Fair value, ending balance 893,000,000 673,000,000 738,000,000
Change in unrealized gains/(losses) related to financial instruments held (40,000,000) 13,000,000 (13,000,000)
Asset-backed securities      
Assets:      
Fair value, beginning balance 37,000,000 127,000,000 153,000,000
Total realized/unrealized gains/(losses) (3,000,000) 0 28,000,000
Purchases 44,000,000 37,000,000 98,000,000
Sales (40,000,000) (93,000,000) (41,000,000)
Settlements (9,000,000) (40,000,000) (55,000,000)
Transfers into level 3 9,000,000 28,000,000 45,000,000
Transfers (out of) level 3 (10,000,000) (22,000,000) (101,000,000)
Fair value, ending balance 28,000,000 37,000,000 127,000,000
Change in unrealized gains/(losses) related to financial instruments held (4,000,000) (3,000,000) 22,000,000
Equity securities      
Assets:      
Fair value, beginning balance 196,000,000 232,000,000 295,000,000
Total realized/unrealized gains/(losses) (75,000,000) (41,000,000) (40,000,000)
Purchases 53,000,000 58,000,000 118,000,000
Sales (376,000,000) (103,000,000) (120,000,000)
Settlements (1,000,000) (22,000,000) (1,000,000)
Transfers into level 3 535,000,000 181,000,000 107,000,000
Transfers (out of) level 3 (153,000,000) (109,000,000) (127,000,000)
Fair value, ending balance 179,000,000 196,000,000 232,000,000
Change in unrealized gains/(losses) related to financial instruments held (20,000,000) (18,000,000) 9,000,000
Other      
Assets:      
Fair value, beginning balance 232,000,000 301,000,000 690,000,000
Total realized/unrealized gains/(losses) 271,000,000 (36,000,000) (285,000,000)
Purchases 245,000,000 50,000,000 55,000,000
Sales (9,000,000) (26,000,000) (40,000,000)
Settlements (154,000,000) (54,000,000) (118,000,000)
Transfers into level 3 6,000,000 2,000,000 3,000,000
Transfers (out of) level 3 (245,000,000) (5,000,000) (4,000,000)
Fair value, ending balance 346,000,000 232,000,000 301,000,000
Change in unrealized gains/(losses) related to financial instruments held 206,000,000 91,000,000 (301,000,000)
Total available-for-sale securities      
Assets:      
Fair value, beginning balance 1,000,000 1,000,000 277,000,000
Total realized/unrealized gains/(losses) 0 0 1,000,000
Purchases 0 0 0
Sales 0 0 0
Settlements (1,000,000) 0 (277,000,000)
Transfers into level 3 0 0 0
Transfers (out of) level 3 0 0 0
Fair value, ending balance 0 1,000,000 1,000,000
Change in unrealized gains/(losses) related to financial instruments held 0 0 0
Level 3 Rollforward Supplemental Data [Abstract]      
Realized gains/(losses) on assets recorded in income 0 0 1,000,000
Unrealized gains/(losses) on assets recorded in OCI 0 0 0
Available-for-sale securities, Mortgage-backed securities      
Assets:      
Fair value, beginning balance 1,000,000 1,000,000 1,000,000
Total realized/unrealized gains/(losses) 0 0 0
Purchases 0 0 0
Sales 0 0 0
Settlements (1,000,000) 0 0
Transfers into level 3 0 0 0
Transfers (out of) level 3 0 0 0
Fair value, ending balance 0 1,000,000 1,000,000
Change in unrealized gains/(losses) related to financial instruments held 0 0 0
Available-for-sale securities, Asset-backed securities      
Assets:      
Fair value, beginning balance 0 0 276,000,000
Total realized/unrealized gains/(losses) 0 0 1,000,000
Purchases 0 0 0
Sales 0 0 0
Settlements 0 0 (277,000,000)
Transfers into level 3 0 0 0
Transfers (out of) level 3 0 0 0
Fair value, ending balance 0 0 0
Change in unrealized gains/(losses) related to financial instruments held 0 0 0
Loans      
Assets:      
Fair value, beginning balance 516,000,000 856,000,000 2,152,000,000
Total realized/unrealized gains/(losses) (243,000,000) 59,000,000 9,000,000
Purchases 962,000,000 236,000,000 412,000,000
Sales (84,000,000) (188,000,000) (1,256,000,000)
Settlements (733,000,000) (482,000,000) (496,000,000)
Transfers into level 3 2,571,000,000 188,000,000 194,000,000
Transfers (out of) level 3 (684,000,000) (153,000,000) (159,000,000)
Fair value, ending balance 2,305,000,000 516,000,000 856,000,000
Change in unrealized gains/(losses) related to financial instruments held (18,000,000) 38,000,000 (4,000,000)
Mortgage servicing rights      
Assets:      
Fair value, beginning balance 4,699,000,000 6,130,000,000 6,030,000,000
Total realized/unrealized gains/(losses) (1,540,000,000) (1,180,000,000) 230,000,000
Purchases 1,192,000,000 1,489,000,000 1,246,000,000
Sales (176,000,000) (789,000,000) (636,000,000)
Settlements (899,000,000) (951,000,000) (740,000,000)
Transfers into level 3 0 0 0
Transfers (out of) level 3 0 0 0
Fair value, ending balance 3,276,000,000 4,699,000,000 6,130,000,000
Change in unrealized gains/(losses) related to financial instruments held (1,540,000,000) (1,180,000,000) 230,000,000
Other assets      
Assets:      
Fair value, beginning balance 917,000,000 1,161,000,000 1,496,000,000
Total realized/unrealized gains/(losses) (63,000,000) (150,000,000) (319,000,000)
Purchases 75,000,000 229,000,000 195,000,000
Sales (104,000,000) (166,000,000) (38,000,000)
Settlements (320,000,000) (156,000,000) (176,000,000)
Transfers into level 3 40,000,000 6,000,000 4,000,000
Transfers (out of) level 3 (7,000,000) (7,000,000) (1,000,000)
Fair value, ending balance 538,000,000 917,000,000 1,161,000,000
Change in unrealized gains/(losses) related to financial instruments held $ (3,000,000) $ (180,000,000) $ (331,000,000)