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Fair Value Measurement - Changes in Level 3 Recurring Measurements (Details) - USD ($)
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Net derivative receivables:      
Fair value, beginning balance $ (3,796,000,000) $ (4,250,000,000)  
Total realized/unrealized gains/(losses) 680,000,000 1,040,000,000  
Purchases 150,000,000 236,000,000  
Sales (542,000,000) (253,000,000)  
Settlements 108,000,000 507,000,000  
Transfers into level 3 (53,000,000) (119,000,000)  
Transfers (out of) level 3 104,000,000 (3,000,000)  
Fair value, ending balance (3,349,000,000) (2,842,000,000)  
Change in unrealized gains/(losses) related to financial instruments held $ 116,000,000 973,000,000  
Level 3 Rollforward Supplemental Data [Abstract]      
Level 3 assets as a percentage of total firm assets at fair value 2.00%   3.00%
Level 3 liabilities as a percentage of total firm liabilities at fair value 14.00%   15.00%
Deposits      
Liabilities:      
Fair value, beginning balance $ 4,169,000,000 4,142,000,000  
Total realized/unrealized (gains)/losses 152,000,000 (90,000,000)  
Purchases 0 0  
Sales 0 0  
Issuances 335,000,000 321,000,000  
Settlements (24,000,000) (198,000,000)  
Transfers into level 3 0 0  
Transfers (out of) level 3 (104,000,000) (158,000,000)  
Fair value, ending balance 4,528,000,000 4,017,000,000  
Change in unrealized (gains)/losses related to financials instruments held 144,000,000 (125,000,000)  
Short-term borrowings      
Liabilities:      
Fair value, beginning balance 1,523,000,000 1,665,000,000  
Total realized/unrealized (gains)/losses 46,000,000 15,000,000  
Purchases 0 0  
Sales 0 0  
Issuances 651,000,000 1,208,000,000  
Settlements (601,000,000) (746,000,000)  
Transfers into level 3 1,000,000 12,000,000  
Transfers (out of) level 3 (118,000,000) (29,000,000)  
Fair value, ending balance 1,502,000,000 2,125,000,000  
Change in unrealized (gains)/losses related to financials instruments held 80,000,000 43,000,000  
Total debt and equity instruments      
Liabilities:      
Fair value, beginning balance 50,000,000 39,000,000  
Total realized/unrealized (gains)/losses 0 3,000,000  
Purchases (2,000,000) (37,000,000)  
Sales 11,000,000 43,000,000  
Issuances 0 0  
Settlements 0 1,000,000  
Transfers into level 3 3,000,000 2,000,000  
Transfers (out of) level 3 (10,000,000) (1,000,000)  
Fair value, ending balance 52,000,000 50,000,000  
Change in unrealized (gains)/losses related to financials instruments held 1,000,000 5,000,000  
Accounts payable and other liabilities      
Liabilities:      
Fair value, beginning balance 10,000,000 13,000,000  
Total realized/unrealized (gains)/losses 0 0  
Purchases (5,000,000) (6,000,000)  
Sales 10,000,000 0  
Issuances 0 0  
Settlements 0 0  
Transfers into level 3 0 0  
Transfers (out of) level 3 0 0  
Fair value, ending balance 15,000,000 7,000,000  
Change in unrealized (gains)/losses related to financials instruments held 0 0  
Beneficial interests issued by consolidated VIEs      
Liabilities:      
Fair value, beginning balance 1,000,000 39,000,000  
Total realized/unrealized (gains)/losses (1,000,000) 0  
Purchases 0 0  
Sales 0 0  
Issuances 0 0  
Settlements 0 (38,000,000)  
Transfers into level 3 0 0  
Transfers (out of) level 3 0 0  
Fair value, ending balance 0 1,000,000  
Change in unrealized (gains)/losses related to financials instruments held 0 0  
Long-term debt      
Liabilities:      
Fair value, beginning balance 19,418,000,000 16,125,000,000  
Total realized/unrealized (gains)/losses 1,273,000,000 (246,000,000)  
Purchases 0 0  
Sales 0 0  
Issuances 2,051,000,000 3,091,000,000  
Settlements (1,188,000,000) (2,263,000,000)  
Transfers into level 3 273,000,000 375,000,000  
Transfers (out of) level 3 (172,000,000) (132,000,000)  
Fair value, ending balance 21,655,000,000 16,950,000,000  
Change in unrealized (gains)/losses related to financials instruments held 1,625,000,000 (354,000,000)  
Debit valuation adjustment for fair value option financial liabilities      
Level 3 Rollforward Supplemental Data [Abstract]      
Unrealized (gains)/losses on liabilities recorded in OCI 176,000,000 52,000,000  
Interest rate      
Net derivative receivables:      
Fair value, beginning balance (38,000,000) 264,000,000  
Total realized/unrealized gains/(losses) (322,000,000) 53,000,000  
Purchases 19,000,000 17,000,000  
Sales (147,000,000) (4,000,000)  
Settlements 298,000,000 46,000,000  
Transfers into level 3 18,000,000 26,000,000  
Transfers (out of) level 3 25,000,000 70,000,000  
Fair value, ending balance (147,000,000) 472,000,000  
Change in unrealized gains/(losses) related to financial instruments held (376,000,000) 131,000,000  
Credit      
Net derivative receivables:      
Fair value, beginning balance (107,000,000) (35,000,000)  
Total realized/unrealized gains/(losses) (17,000,000) 17,000,000  
Purchases 0 1,000,000  
Sales (1,000,000) (2,000,000)  
Settlements 6,000,000 4,000,000  
Transfers into level 3 3,000,000 3,000,000  
Transfers (out of) level 3 1,000,000 17,000,000  
Fair value, ending balance (115,000,000) 5,000,000  
Change in unrealized gains/(losses) related to financial instruments held (21,000,000) 11,000,000  
Foreign exchange      
Net derivative receivables:      
Fair value, beginning balance (297,000,000) (396,000,000)  
Total realized/unrealized gains/(losses) (245,000,000) 146,000,000  
Purchases 1,000,000 0  
Sales (9,000,000) (5,000,000)  
Settlements 181,000,000 11,000,000  
Transfers into level 3 (8,000,000) (38,000,000)  
Transfers (out of) level 3 21,000,000 (6,000,000)  
Fair value, ending balance (356,000,000) (288,000,000)  
Change in unrealized gains/(losses) related to financial instruments held (220,000,000) 156,000,000  
Equity      
Net derivative receivables:      
Fair value, beginning balance (2,225,000,000) (3,409,000,000)  
Total realized/unrealized gains/(losses) 731,000,000 639,000,000  
Purchases 127,000,000 218,000,000  
Sales (297,000,000) (242,000,000)  
Settlements (401,000,000) 434,000,000  
Transfers into level 3 (67,000,000) (111,000,000)  
Transfers (out of) level 3 66,000,000 (41,000,000)  
Fair value, ending balance (2,066,000,000) (2,512,000,000)  
Change in unrealized gains/(losses) related to financial instruments held 226,000,000 448,000,000  
Commodity      
Net derivative receivables:      
Fair value, beginning balance (1,129,000,000) (674,000,000)  
Total realized/unrealized gains/(losses) 533,000,000 185,000,000  
Purchases 3,000,000 0  
Sales (88,000,000) 0  
Settlements 24,000,000 12,000,000  
Transfers into level 3 1,000,000 1,000,000  
Transfers (out of) level 3 (9,000,000) (43,000,000)  
Fair value, ending balance (665,000,000) (519,000,000)  
Change in unrealized gains/(losses) related to financial instruments held 507,000,000 227,000,000  
Total mortgage-backed securities      
Assets:      
Fair value, beginning balance 624,000,000 378,000,000  
Total realized/unrealized gains/(losses) 11,000,000 2,000,000  
Purchases 87,000,000 335,000,000  
Sales (188,000,000) (96,000,000)  
Settlements (21,000,000) (23,000,000)  
Transfers into level 3 31,000,000 37,000,000  
Transfers (out of) level 3 (30,000,000) (56,000,000)  
Fair value, ending balance 514,000,000 577,000,000  
Change in unrealized gains/(losses) related to financial instruments held (14,000,000) 1,000,000  
Mortgage-backed securities, U.S. government agencies      
Assets:      
Fair value, beginning balance 549,000,000 307,000,000  
Total realized/unrealized gains/(losses) (15,000,000) 3,000,000  
Purchases 5,000,000 329,000,000  
Sales (100,000,000) (87,000,000)  
Settlements (18,000,000) (20,000,000)  
Transfers into level 3 1,000,000 4,000,000  
Transfers (out of) level 3 (10,000,000) (28,000,000)  
Fair value, ending balance 412,000,000 508,000,000  
Change in unrealized gains/(losses) related to financial instruments held (16,000,000) 1,000,000  
Mortgage-backed securities, Residential - nonagency      
Assets:      
Fair value, beginning balance 64,000,000 60,000,000  
Total realized/unrealized gains/(losses) 24,000,000 (2,000,000)  
Purchases 70,000,000 0  
Sales (69,000,000) (2,000,000)  
Settlements (1,000,000) (2,000,000)  
Transfers into level 3 15,000,000 29,000,000  
Transfers (out of) level 3 (18,000,000) (28,000,000)  
Fair value, ending balance 85,000,000 55,000,000  
Change in unrealized gains/(losses) related to financial instruments held 1,000,000 0  
Mortgage-backed securities, Commercial - nonagency      
Assets:      
Fair value, beginning balance 11,000,000 11,000,000  
Total realized/unrealized gains/(losses) 2,000,000 1,000,000  
Purchases 12,000,000 6,000,000  
Sales (19,000,000) (7,000,000)  
Settlements (2,000,000) (1,000,000)  
Transfers into level 3 15,000,000 4,000,000  
Transfers (out of) level 3 (2,000,000) 0  
Fair value, ending balance 17,000,000 14,000,000  
Change in unrealized gains/(losses) related to financial instruments held 1,000,000 0  
Total debt and equity instruments      
Assets:      
Fair value, beginning balance 4,168,000,000 5,370,000,000  
Total realized/unrealized gains/(losses) 128,000,000 75,000,000  
Purchases 498,000,000 1,210,000,000  
Sales (542,000,000) (1,045,000,000)  
Settlements (187,000,000) (292,000,000)  
Transfers into level 3 316,000,000 324,000,000  
Transfers (out of) level 3 (140,000,000) (429,000,000)  
Fair value, ending balance 4,241,000,000 5,213,000,000  
Change in unrealized gains/(losses) related to financial instruments held 128,000,000 39,000,000  
Total debt instruments      
Assets:      
Fair value, beginning balance 3,635,000,000 4,385,000,000  
Total realized/unrealized gains/(losses) 126,000,000 68,000,000  
Purchases 471,000,000 1,164,000,000  
Sales (462,000,000) (1,029,000,000)  
Settlements (154,000,000) (272,000,000)  
Transfers into level 3 240,000,000 319,000,000  
Transfers (out of) level 3 (121,000,000) (420,000,000)  
Fair value, ending balance 3,735,000,000 4,215,000,000  
Change in unrealized gains/(losses) related to financial instruments held 117,000,000 31,000,000  
U.S. Treasury and government agencies      
Assets:      
Fair value, beginning balance 0 1,000,000  
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 (1,000,000)  
Fair value, ending balance 0 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 689,000,000 744,000,000  
Total realized/unrealized gains/(losses) 13,000,000 (2,000,000)  
Purchases 1,000,000 39,000,000  
Sales (74,000,000) 0  
Settlements (6,000,000) (77,000,000)  
Transfers into level 3 0 0  
Transfers (out of) level 3 0 0  
Fair value, ending balance 623,000,000 704,000,000  
Change in unrealized gains/(losses) related to financial instruments held 14,000,000 (2,000,000)  
Non-U.S. government debt securities      
Assets:      
Fair value, beginning balance 155,000,000 78,000,000  
Total realized/unrealized gains/(losses) (1,000,000) 2,000,000  
Purchases 71,000,000 225,000,000  
Sales (54,000,000) (92,000,000)  
Settlements 0 0  
Transfers into level 3 2,000,000 17,000,000  
Transfers (out of) level 3 (3,000,000) (33,000,000)  
Fair value, ending balance 170,000,000 197,000,000  
Change in unrealized gains/(losses) related to financial instruments held (1,000,000) 3,000,000  
Corporate debt securities      
Assets:      
Fair value, beginning balance 334,000,000 312,000,000  
Total realized/unrealized gains/(losses) 22,000,000 (1,000,000)  
Purchases 223,000,000 81,000,000  
Sales (7,000,000) (100,000,000)  
Settlements 0 (1,000,000)  
Transfers into level 3 28,000,000 131,000,000  
Transfers (out of) level 3 (32,000,000) (116,000,000)  
Fair value, ending balance 568,000,000 306,000,000  
Change in unrealized gains/(losses) related to financial instruments held 39,000,000 (1,000,000)  
Loans      
Assets:      
Fair value, beginning balance 1,706,000,000 2,719,000,000  
Total realized/unrealized gains/(losses) 83,000,000 62,000,000  
Purchases 72,000,000 470,000,000  
Sales (118,000,000) (728,000,000)  
Settlements (120,000,000) (137,000,000)  
Transfers into level 3 159,000,000 123,000,000  
Transfers (out of) level 3 (41,000,000) (141,000,000)  
Fair value, ending balance 1,741,000,000 2,368,000,000  
Change in unrealized gains/(losses) related to financial instruments held 83,000,000 30,000,000  
Asset-backed securities      
Assets:      
Fair value, beginning balance 127,000,000 153,000,000  
Total realized/unrealized gains/(losses) (2,000,000) 5,000,000  
Purchases 17,000,000 14,000,000  
Sales (21,000,000) (13,000,000)  
Settlements (7,000,000) (34,000,000)  
Transfers into level 3 20,000,000 11,000,000  
Transfers (out of) level 3 (15,000,000) (73,000,000)  
Fair value, ending balance 119,000,000 63,000,000  
Change in unrealized gains/(losses) related to financial instruments held (4,000,000) 0  
Equity securities      
Assets:      
Fair value, beginning balance 232,000,000 295,000,000  
Total realized/unrealized gains/(losses) (2,000,000) (8,000,000)  
Purchases 15,000,000 28,000,000  
Sales (79,000,000) (10,000,000)  
Settlements (22,000,000) 0  
Transfers into level 3 75,000,000 4,000,000  
Transfers (out of) level 3 (17,000,000) (9,000,000)  
Fair value, ending balance 202,000,000 300,000,000  
Change in unrealized gains/(losses) related to financial instruments held (2,000,000) (7,000,000)  
Other      
Assets:      
Fair value, beginning balance 301,000,000 690,000,000  
Total realized/unrealized gains/(losses) 4,000,000 15,000,000  
Purchases 12,000,000 18,000,000  
Sales (1,000,000) (6,000,000)  
Settlements (11,000,000) (20,000,000)  
Transfers into level 3 1,000,000 1,000,000  
Transfers (out of) level 3 (2,000,000) 0  
Fair value, ending balance 304,000,000 698,000,000  
Change in unrealized gains/(losses) related to financial instruments held 13,000,000 15,000,000  
Total available-for-sale securities      
Assets:      
Fair value, beginning balance 1,000,000 277,000,000  
Total realized/unrealized gains/(losses) 0 1,000,000  
Purchases 0 0  
Sales 0 0  
Settlements (1,000,000) (73,000,000)  
Transfers into level 3 0 0  
Transfers (out of) level 3 0 0  
Fair value, ending balance 0 205,000,000  
Change in unrealized gains/(losses) related to financial instruments held 0 1,000,000  
Level 3 Rollforward Supplemental Data [Abstract]      
Realized gains/(losses) recorded in income 0 0  
Unrealized gains/(losses) recorded in OCI 0 1,000,000  
Mortgage-backed securities      
Assets:      
Fair value, beginning balance 1,000,000 1,000,000  
Total realized/unrealized gains/(losses) 0 0  
Purchases 0 0  
Sales 0 0  
Settlements (1,000,000) 0  
Transfers into level 3 0 0  
Transfers (out of) level 3 0 0  
Fair value, ending balance 0 1,000,000  
Change in unrealized gains/(losses) related to financial instruments held 0 0  
Asset-backed securities      
Assets:      
Fair value, beginning balance 0 276,000,000  
Total realized/unrealized gains/(losses) 0 1,000,000  
Purchases 0 0  
Sales 0 0  
Settlements 0 (73,000,000)  
Transfers into level 3 0 0  
Transfers (out of) level 3 0 0  
Fair value, ending balance 0 204,000,000  
Change in unrealized gains/(losses) related to financial instruments held 0 1,000,000  
Loans      
Assets:      
Fair value, beginning balance 122,000,000 276,000,000  
Total realized/unrealized gains/(losses) 3,000,000 5,000,000  
Purchases 0 122,000,000  
Sales 0 0  
Settlements (2,000,000) (7,000,000)  
Transfers into level 3 0 0  
Transfers (out of) level 3 0 0  
Fair value, ending balance 123,000,000 396,000,000  
Change in unrealized gains/(losses) related to financial instruments held 3,000,000 5,000,000  
Mortgage servicing rights      
Assets:      
Fair value, beginning balance 6,130,000,000 6,030,000,000  
Total realized/unrealized gains/(losses) (299,000,000) 384,000,000  
Purchases 436,000,000 243,000,000  
Sales (111,000,000) (295,000,000)  
Settlements (199,000,000) (160,000,000)  
Transfers into level 3 0 0  
Transfers (out of) level 3 0 0  
Fair value, ending balance 5,957,000,000 6,202,000,000  
Change in unrealized gains/(losses) related to financial instruments held (299,000,000) 384,000,000  
Other assets      
Assets:      
Fair value, beginning balance 927,000,000 1,265,000,000  
Total realized/unrealized gains/(losses) (7,000,000) (37,000,000)  
Purchases 9,000,000 23,000,000  
Sales (80,000,000) (14,000,000)  
Settlements (1,000,000) (16,000,000)  
Transfers into level 3 0 0  
Transfers (out of) level 3 (7,000,000) (1,000,000)  
Fair value, ending balance 841,000,000 1,220,000,000  
Change in unrealized gains/(losses) related to financial instruments held $ (10,000,000) $ (38,000,000)