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Fair Value Measurement - Changes in Level 3 Recurring Measurements (Details) - USD ($)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Net derivative receivables:      
Beginning balance $ (4,250,000,000) $ (2,360,000,000) $ (1,749,000,000)
Total realized/unrealized gains/(losses) 338,000,000 (615,000,000) 130,000,000
Purchases 1,841,000,000 1,190,000,000 545,000,000
Sales (2,440,000,000) (649,000,000) (1,025,000,000)
Settlements 1,047,000,000 (864,000,000) (293,000,000)
Transfers into level 3 (729,000,000) (1,480,000,000) 76,000,000
Transfers (out of) level 3 397,000,000 528,000,000 (44,000,000)
Ending balance (3,796,000,000) (4,250,000,000) (2,360,000,000)
Change in unrealized gains/(losses) related to financial instruments held $ 803,000,000 $ (1,278,000,000) $ (1,238,000,000)
Level 3 Rollforward Supplemental Data [Abstract]      
Level 3 assets as a percentage of total firm assets at fair value 3.00% 3.00% 4.00%
Level 3 liabilities as a percentage of total firm liabilities at fair value 15.00% 15.00% 12.00%
Deposits      
Liabilities:      
Beginning balance $ 4,142,000,000 $ 2,117,000,000 $ 2,950,000,000
Total realized/unrealized (gains)/losses (136,000,000) 152,000,000 (56,000,000)
Purchases 0 0 0
Sales 0 0 0
Issuances 1,437,000,000 3,027,000,000 1,375,000,000
Settlements (736,000,000) (291,000,000) (1,283,000,000)
Transfers into level 3 2,000,000 11,000,000 0
Transfers (out of) level 3 (540,000,000) (874,000,000) (869,000,000)
Ending balance 4,169,000,000 4,142,000,000 2,117,000,000
Change in unrealized gains/(losses) related to financials instruments held (204,000,000) 198,000,000 23,000,000
Federal funds purchased and securities loaned or sold under repurchase agreements      
Liabilities:      
Beginning balance 0 0 0
Total realized/unrealized (gains)/losses 0 0 0
Purchases 0 0 0
Sales 0 0 0
Issuances 0 0 0
Settlements 0 0 (2,000,000)
Transfers into level 3 0 0 6,000,000
Transfers (out of) level 3 0 0 (4,000,000)
Ending balance 0 0 0
Change in unrealized gains/(losses) related to financials instruments held 0 0 0
Short-term borrowings      
Liabilities:      
Beginning balance 1,665,000,000 1,134,000,000 639,000,000
Total realized/unrealized (gains)/losses (329,000,000) 42,000,000 (230,000,000)
Purchases 0 0 0
Sales 0 0 0
Issuances 3,455,000,000 3,289,000,000 1,876,000,000
Settlements (3,388,000,000) (2,748,000,000) (1,210,000,000)
Transfers into level 3 272,000,000 150,000,000 114,000,000
Transfers (out of) level 3 (152,000,000) (202,000,000) (55,000,000)
Ending balance 1,523,000,000 1,665,000,000 1,134,000,000
Change in unrealized gains/(losses) related to financials instruments held (131,000,000) 7,000,000 (70,000,000)
Total debt and equity instruments      
Liabilities:      
Beginning balance 39,000,000 43,000,000 63,000,000
Total realized/unrealized (gains)/losses 19,000,000 (3,000,000) (12,000,000)
Purchases (99,000,000) (46,000,000) (15,000,000)
Sales 114,000,000 48,000,000 23,000,000
Issuances 0 0 0
Settlements (1,000,000) 3,000,000 (22,000,000)
Transfers into level 3 14,000,000 3,000,000 13,000,000
Transfers (out of) level 3 (36,000,000) (9,000,000) (7,000,000)
Ending balance 50,000,000 39,000,000 43,000,000
Change in unrealized gains/(losses) related to financials instruments held 16,000,000 0 (18,000,000)
Accounts payable and other liabilities      
Liabilities:      
Beginning balance 13,000,000 13,000,000 19,000,000
Total realized/unrealized (gains)/losses 0 (2,000,000) 0
Purchases (12,000,000) (1,000,000) 0
Sales 5,000,000 0 0
Issuances 0 0 0
Settlements 0 3,000,000 (6,000,000)
Transfers into level 3 4,000,000 0 0
Transfers (out of) level 3 0 0 0
Ending balance 10,000,000 13,000,000 13,000,000
Change in unrealized gains/(losses) related to financials instruments held 0 (2,000,000) 0
Beneficial interests issued by consolidated VIEs      
Liabilities:      
Beginning balance 39,000,000 48,000,000 549,000,000
Total realized/unrealized (gains)/losses 0 2,000,000 (31,000,000)
Purchases 0 (122,000,000) 0
Sales 1,000,000 39,000,000 0
Issuances 0 0 143,000,000
Settlements (39,000,000) (6,000,000) (613,000,000)
Transfers into level 3 0 78,000,000 0
Transfers (out of) level 3 0 0 0
Ending balance 1,000,000 39,000,000 48,000,000
Change in unrealized gains/(losses) related to financials instruments held 0 0 6,000,000
Long-term debt      
Liabilities:      
Beginning balance 16,125,000,000 12,850,000,000 11,447,000,000
Total realized/unrealized (gains)/losses (1,169,000,000) 1,067,000,000 147,000,000
Purchases 0 0 0
Sales 0 0 0
Issuances 11,919,000,000 12,458,000,000 8,140,000,000
Settlements (7,769,000,000) (10,985,000,000) (5,810,000,000)
Transfers into level 3 1,143,000,000 1,660,000,000 315,000,000
Transfers (out of) level 3 (831,000,000) (925,000,000) (1,389,000,000)
Ending balance 19,418,000,000 16,125,000,000 12,850,000,000
Change in unrealized gains/(losses) related to financials instruments held (1,385,000,000) 552,000,000 639,000,000
DVA for fair value option elected liabilities      
Level 3 Rollforward Supplemental Data [Abstract]      
Unrealized gains/(losses) on liabilities recorded in OCI (277,000,000) (48,000,000)  
Interest rate      
Net derivative receivables:      
Beginning balance 264,000,000 1,263,000,000 876,000,000
Total realized/unrealized gains/(losses) 150,000,000 72,000,000 756,000,000
Purchases 107,000,000 60,000,000 193,000,000
Sales (133,000,000) (82,000,000) (57,000,000)
Settlements (430,000,000) (1,040,000,000) (713,000,000)
Transfers into level 3 (15,000,000) (8,000,000) (14,000,000)
Transfers (out of) level 3 19,000,000 (1,000,000) 222,000,000
Ending balance (38,000,000) 264,000,000 1,263,000,000
Change in unrealized gains/(losses) related to financial instruments held 187,000,000 (473,000,000) (144,000,000)
Credit      
Net derivative receivables:      
Beginning balance (35,000,000) 98,000,000 549,000,000
Total realized/unrealized gains/(losses) (40,000,000) (164,000,000) (742,000,000)
Purchases 5,000,000 1,000,000 10,000,000
Sales (7,000,000) (6,000,000) (2,000,000)
Settlements (57,000,000) 0 211,000,000
Transfers into level 3 4,000,000 77,000,000 36,000,000
Transfers (out of) level 3 23,000,000 (41,000,000) 36,000,000
Ending balance (107,000,000) (35,000,000) 98,000,000
Change in unrealized gains/(losses) related to financial instruments held (28,000,000) 32,000,000 (622,000,000)
Foreign exchange      
Net derivative receivables:      
Beginning balance (396,000,000) (1,384,000,000) (725,000,000)
Total realized/unrealized gains/(losses) 103,000,000 43,000,000 67,000,000
Purchases 52,000,000 13,000,000 64,000,000
Sales (20,000,000) (10,000,000) (124,000,000)
Settlements 30,000,000 854,000,000 (649,000,000)
Transfers into level 3 (108,000,000) (61,000,000) (48,000,000)
Transfers (out of) level 3 42,000,000 149,000,000 31,000,000
Ending balance (297,000,000) (396,000,000) (1,384,000,000)
Change in unrealized gains/(losses) related to financial instruments held (63,000,000) 42,000,000 (350,000,000)
Equity      
Net derivative receivables:      
Beginning balance (3,409,000,000) (2,252,000,000) (1,514,000,000)
Total realized/unrealized gains/(losses) 198,000,000 (417,000,000) (145,000,000)
Purchases 1,676,000,000 1,116,000,000 277,000,000
Sales (2,208,000,000) (551,000,000) (852,000,000)
Settlements 1,805,000,000 (245,000,000) 213,000,000
Transfers into level 3 (617,000,000) (1,482,000,000) 94,000,000
Transfers (out of) level 3 330,000,000 422,000,000 (325,000,000)
Ending balance (2,225,000,000) (3,409,000,000) (2,252,000,000)
Change in unrealized gains/(losses) related to financial instruments held 561,000,000 (161,000,000) (86,000,000)
Commodity      
Net derivative receivables:      
Beginning balance (674,000,000) (85,000,000) (935,000,000)
Total realized/unrealized gains/(losses) (73,000,000) (149,000,000) 194,000,000
Purchases 1,000,000 0 1,000,000
Sales (72,000,000) 0 10,000,000
Settlements (301,000,000) (433,000,000) 645,000,000
Transfers into level 3 7,000,000 (6,000,000) 8,000,000
Transfers (out of) level 3 (17,000,000) (1,000,000) (8,000,000)
Ending balance (1,129,000,000) (674,000,000) (85,000,000)
Change in unrealized gains/(losses) related to financial instruments held 146,000,000 (718,000,000) (36,000,000)
Mortgage-backed securities      
Assets:      
Fair value, beginning balance 378,000,000 492,000,000 1,024,000,000
Total realized/unrealized gains/(losses) (23,000,000) 17,000,000 (27,000,000)
Purchases 574,000,000 241,000,000 456,000,000
Sales (232,000,000) (245,000,000) (643,000,000)
Settlements (97,000,000) (147,000,000) (138,000,000)
Transfers into level 3 189,000,000 245,000,000 351,000,000
Transfers (out of) level 3 (165,000,000) (225,000,000) (531,000,000)
Fair value, ending balance 624,000,000 378,000,000 492,000,000
Change in unrealized gains/(losses) related to financial instruments held (22,000,000) (8,000,000) (28,000,000)
Mortgage-backed securities, U.S. government agencies      
Assets:      
Fair value, beginning balance 307,000,000 392,000,000 715,000,000
Total realized/unrealized gains/(losses) (23,000,000) (11,000,000) (20,000,000)
Purchases 478,000,000 161,000,000 135,000,000
Sales (164,000,000) (171,000,000) (295,000,000)
Settlements (73,000,000) (70,000,000) (115,000,000)
Transfers into level 3 94,000,000 49,000,000 111,000,000
Transfers (out of) level 3 (70,000,000) (43,000,000) (139,000,000)
Fair value, ending balance 549,000,000 307,000,000 392,000,000
Change in unrealized gains/(losses) related to financial instruments held (21,000,000) (20,000,000) (36,000,000)
Mortgage-backed securities, Residential - nonagency      
Assets:      
Fair value, beginning balance 60,000,000 83,000,000 194,000,000
Total realized/unrealized gains/(losses) (2,000,000) 19,000,000 4,000,000
Purchases 78,000,000 53,000,000 252,000,000
Sales (50,000,000) (30,000,000) (319,000,000)
Settlements (7,000,000) (64,000,000) (20,000,000)
Transfers into level 3 59,000,000 132,000,000 67,000,000
Transfers (out of) level 3 (74,000,000) (133,000,000) (95,000,000)
Fair value, ending balance 64,000,000 60,000,000 83,000,000
Change in unrealized gains/(losses) related to financial instruments held 1,000,000 11,000,000 5,000,000
Mortgage-backed securities, Commercial - nonagency      
Assets:      
Fair value, beginning balance 11,000,000 17,000,000 115,000,000
Total realized/unrealized gains/(losses) 2,000,000 9,000,000 (11,000,000)
Purchases 18,000,000 27,000,000 69,000,000
Sales (18,000,000) (44,000,000) (29,000,000)
Settlements (17,000,000) (13,000,000) (3,000,000)
Transfers into level 3 36,000,000 64,000,000 173,000,000
Transfers (out of) level 3 (21,000,000) (49,000,000) (297,000,000)
Fair value, ending balance 11,000,000 11,000,000 17,000,000
Change in unrealized gains/(losses) related to financial instruments held (2,000,000) 1,000,000 3,000,000
Total debt and equity instruments      
Assets:      
Fair value, beginning balance 5,370,000,000 7,894,000,000 11,930,000,000
Total realized/unrealized gains/(losses) (351,000,000) 550,000,000 (235,000,000)
Purchases 3,144,000,000 4,773,000,000 4,763,000,000
Sales (2,882,000,000) (4,827,000,000) (4,936,000,000)
Settlements (1,069,000,000) (2,194,000,000) (3,051,000,000)
Transfers into level 3 1,442,000,000 1,422,000,000 1,905,000,000
Transfers (out of) level 3 (1,486,000,000) (2,248,000,000) (2,482,000,000)
Fair value, ending balance 4,168,000,000 5,370,000,000 7,894,000,000
Change in unrealized gains/(losses) related to financial instruments held (320,000,000) 128,000,000 (172,000,000)
Total debt instruments      
Assets:      
Fair value, beginning balance 4,385,000,000 6,902,000,000 10,921,000,000
Total realized/unrealized gains/(losses) (26,000,000) 411,000,000 (314,000,000)
Purchases 2,971,000,000 4,567,000,000 4,024,000,000
Sales (2,722,000,000) (4,633,000,000) (4,541,000,000)
Settlements (950,000,000) (2,028,000,000) (2,651,000,000)
Transfers into level 3 1,332,000,000 1,346,000,000 1,850,000,000
Transfers (out of) level 3 (1,355,000,000) (2,180,000,000) (2,387,000,000)
Fair value, ending balance 3,635,000,000 4,385,000,000 6,902,000,000
Change in unrealized gains/(losses) related to financial instruments held (28,000,000) 68,000,000 (207,000,000)
U.S. Treasury and government agencies      
Assets:      
Fair value, beginning balance 1,000,000 0  
Total realized/unrealized gains/(losses) 0 0  
Purchases 0 0  
Sales 0 0  
Settlements 0 0  
Transfers into level 3 0 1,000,000  
Transfers (out of) level 3 (1,000,000) 0  
Fair value, ending balance 0 1,000,000 0
Change in unrealized gains/(losses) related to financial instruments held 0 0  
Obligations of U.S. states and municipalities      
Assets:      
Fair value, beginning balance 744,000,000 649,000,000 651,000,000
Total realized/unrealized gains/(losses) (17,000,000) 18,000,000 19,000,000
Purchases 112,000,000 152,000,000 149,000,000
Sales (70,000,000) (70,000,000) (132,000,000)
Settlements (80,000,000) (5,000,000) (38,000,000)
Transfers into level 3 0 0 0
Transfers (out of) level 3 0 0 0
Fair value, ending balance 689,000,000 744,000,000 649,000,000
Change in unrealized gains/(losses) related to financial instruments held (17,000,000) 15,000,000 0
Non-U.S. government debt securities      
Assets:      
Fair value, beginning balance 78,000,000 46,000,000 74,000,000
Total realized/unrealized gains/(losses) (22,000,000) 0 (4,000,000)
Purchases 459,000,000 559,000,000 91,000,000
Sales (277,000,000) (518,000,000) (97,000,000)
Settlements (12,000,000) 0 (7,000,000)
Transfers into level 3 23,000,000 62,000,000 19,000,000
Transfers (out of) level 3 (94,000,000) (71,000,000) (30,000,000)
Fair value, ending balance 155,000,000 78,000,000 46,000,000
Change in unrealized gains/(losses) related to financial instruments held (9,000,000) 0 (7,000,000)
Corporate debt securities      
Assets:      
Fair value, beginning balance 312,000,000 576,000,000 736,000,000
Total realized/unrealized gains/(losses) (18,000,000) 11,000,000 2,000,000
Purchases 364,000,000 872,000,000 445,000,000
Sales (309,000,000) (612,000,000) (359,000,000)
Settlements (48,000,000) (497,000,000) (189,000,000)
Transfers into level 3 262,000,000 157,000,000 148,000,000
Transfers (out of) level 3 (229,000,000) (195,000,000) (207,000,000)
Fair value, ending balance 334,000,000 312,000,000 576,000,000
Change in unrealized gains/(losses) related to financial instruments held (1,000,000) 18,000,000 (22,000,000)
Loans      
Assets:      
Fair value, beginning balance 2,719,000,000 4,837,000,000 6,604,000,000
Total realized/unrealized gains/(losses) 26,000,000 333,000,000 (343,000,000)
Purchases 1,364,000,000 2,389,000,000 2,228,000,000
Sales (1,793,000,000) (2,832,000,000) (2,598,000,000)
Settlements (658,000,000) (1,323,000,000) (1,311,000,000)
Transfers into level 3 813,000,000 806,000,000 1,044,000,000
Transfers (out of) level 3 (765,000,000) (1,491,000,000) (787,000,000)
Fair value, ending balance 1,706,000,000 2,719,000,000 4,837,000,000
Change in unrealized gains/(losses) related to financial instruments held (1,000,000) 43,000,000 (169,000,000)
Asset-backed securities      
Assets:      
Fair value, beginning balance 153,000,000 302,000,000 1,832,000,000
Total realized/unrealized gains/(losses) 28,000,000 32,000,000 39,000,000
Purchases 98,000,000 354,000,000 655,000,000
Sales (41,000,000) (356,000,000) (712,000,000)
Settlements (55,000,000) (56,000,000) (968,000,000)
Transfers into level 3 45,000,000 75,000,000 288,000,000
Transfers (out of) level 3 (101,000,000) (198,000,000) (832,000,000)
Fair value, ending balance 127,000,000 153,000,000 302,000,000
Change in unrealized gains/(losses) related to financial instruments held 22,000,000 0 19,000,000
Equity securities      
Assets:      
Fair value, beginning balance 295,000,000 231,000,000 265,000,000
Total realized/unrealized gains/(losses) (40,000,000) 39,000,000 0
Purchases 118,000,000 176,000,000 90,000,000
Sales (120,000,000) (148,000,000) (108,000,000)
Settlements (1,000,000) (4,000,000) (40,000,000)
Transfers into level 3 107,000,000 59,000,000 29,000,000
Transfers (out of) level 3 (127,000,000) (58,000,000) (5,000,000)
Fair value, ending balance 232,000,000 295,000,000 231,000,000
Change in unrealized gains/(losses) related to financial instruments held 9,000,000 21,000,000 7,000,000
Physical commodities      
Assets:      
Fair value, beginning balance   0 0
Total realized/unrealized gains/(losses)     0
Purchases     0
Sales     0
Settlements     0
Transfers into level 3     0
Transfers (out of) level 3     0
Fair value, ending balance     0
Change in unrealized gains/(losses) related to financial instruments held     0
Other      
Assets:      
Fair value, beginning balance 690,000,000 761,000,000 744,000,000
Total realized/unrealized gains/(losses) (285,000,000) 100,000,000 79,000,000
Purchases 55,000,000 30,000,000 649,000,000
Sales (40,000,000) (46,000,000) (287,000,000)
Settlements (118,000,000) (162,000,000) (360,000,000)
Transfers into level 3 3,000,000 17,000,000 26,000,000
Transfers (out of) level 3 (4,000,000) (10,000,000) (90,000,000)
Fair value, ending balance 301,000,000 690,000,000 761,000,000
Change in unrealized gains/(losses) related to financial instruments held (301,000,000) 39,000,000 28,000,000
Total available-for-sale securities      
Assets:      
Fair value, beginning balance 277,000,000 664,000,000 824,000,000
Total realized/unrealized gains/(losses) 1,000,000 15,000,000 1,000,000
Purchases 0 0 0
Sales 0 (50,000,000) 0
Settlements (277,000,000) (352,000,000) (119,000,000)
Transfers into level 3 0 0 0
Transfers (out of) level 3 0 0 (42,000,000)
Fair value, ending balance 1,000,000 277,000,000 664,000,000
Change in unrealized gains/(losses) related to financial instruments held 0 14,000,000 1,000,000
Level 3 Rollforward Supplemental Data [Abstract]      
Realized gains/(losses) on assets recorded in income 1,000,000 0 0
Unrealized gains/(losses) on assets recorded in OCI 0 15,000,000 1,000,000
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 0 0 0
Transfers into level 3 0 0 0
Transfers (out of) level 3 0 0 0
Fair value, ending balance 1,000,000 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 276,000,000 663,000,000 823,000,000
Total realized/unrealized gains/(losses) 1,000,000 15,000,000 1,000,000
Purchases 0 0 0
Sales 0 (50,000,000) 0
Settlements (277,000,000) (352,000,000) (119,000,000)
Transfers into level 3 0 0 0
Transfers (out of) level 3 0 0 (42,000,000)
Fair value, ending balance 0 276,000,000 663,000,000
Change in unrealized gains/(losses) related to financial instruments held 0 14,000,000 1,000,000
Loans      
Assets:      
Fair value, beginning balance 276,000,000 570,000,000 1,518,000,000
Total realized/unrealized gains/(losses) (7,000,000) 35,000,000 (49,000,000)
Purchases 123,000,000 0 259,000,000
Sales 0 (26,000,000) (7,000,000)
Settlements (196,000,000) (303,000,000) (838,000,000)
Transfers into level 3 0 0 0
Transfers (out of) level 3 (74,000,000) 0 (313,000,000)
Fair value, ending balance 122,000,000 276,000,000 570,000,000
Change in unrealized gains/(losses) related to financial instruments held (7,000,000) 3,000,000 0
Mortgage servicing rights      
Assets:      
Fair value, beginning balance 6,030,000,000 6,096,000,000 6,608,000,000
Total realized/unrealized gains/(losses) 230,000,000 (232,000,000) (163,000,000)
Purchases 1,246,000,000 1,103,000,000 679,000,000
Sales (636,000,000) (140,000,000) (109,000,000)
Settlements (740,000,000) (797,000,000) (919,000,000)
Transfers into level 3 0 0 0
Transfers (out of) level 3 0 0 0
Fair value, ending balance 6,130,000,000 6,030,000,000 6,096,000,000
Change in unrealized gains/(losses) related to financial instruments held 230,000,000 (232,000,000) (163,000,000)
Other assets      
Assets:      
Fair value, beginning balance 1,265,000,000 2,223,000,000 2,401,000,000
Total realized/unrealized gains/(losses) (328,000,000) 244,000,000 130,000,000
Purchases 61,000,000 66,000,000 487,000,000
Sales (37,000,000) (177,000,000) (496,000,000)
Settlements (37,000,000) (870,000,000) (299,000,000)
Transfers into level 3 4,000,000 0 0
Transfers (out of) level 3 (1,000,000) (221,000,000) 0
Fair value, ending balance 927,000,000 1,265,000,000 2,223,000,000
Change in unrealized gains/(losses) related to financial instruments held $ (340,000,000) $ 74,000,000 $ 48,000,000