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Trading Cash Instruments - Cash Instruments, Level 3 Rollforward (Detail) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Trading Cash Instruments Assets [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value, Beginning Balance $ 1,804 $ 1,519 $ 1,242 $ 1,689
Net realized gains / (losses) 15 3 59 50
Net unrealized gains / (losses) 34 (122) (146) (75)
Purchases 244 162 685 547
Sales (701) (207) (438) (735)
Settlements (124) (80) (264) (185)
Transfers into level 3 157 367 313 280
Transfers out of level 3 (164) (207) (186) (136)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value, Ending Balance 1,265 1,435 1,265 1,435
Trading Cash Instruments Assets [Member] | Loans and Securities Backed by Commercial Real Estate [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value, Beginning Balance 430 268 191 332
Net realized gains / (losses) 2 11 15 27
Net unrealized gains / (losses) (2) (19) (36) (36)
Purchases 7 1 77 40
Sales (228) (35) (19) (127)
Settlements (3) (20) (55) (61)
Transfers into level 3 7 19 30 57
Transfers out of level 3 (17) (1) (7) (8)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value, Ending Balance 196 224 196 224
Trading Cash Instruments Assets [Member] | Loans and Securities Backed by Residential Real Estate [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value, Beginning Balance 307 270 231 348
Net realized gains / (losses) 4 5 7 8
Net unrealized gains / (losses) 5 9 17 22
Purchases 78 31 97 130
Sales (177) (104) (79) (222)
Settlements (11) (12) (33) (26)
Transfers into level 3 4 79 22 4
Transfers out of level 3 (30) (36) (82) (22)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value, Ending Balance 180 242 180 242
Trading Cash Instruments Assets [Member] | Corporate debt instruments [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value, Beginning Balance 764 822 692 912
Net realized gains / (losses) 10 18 28 39
Net unrealized gains / (losses) 25 (30) (102) 13
Purchases 139 69 455 218
Sales (89) (55) (256) (346)
Settlements (103) (42) (157) (71)
Transfers into level 3 129 126 214 92
Transfers out of level 3 (93) (150) (92) (99)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value, Ending Balance 782 758 782 758
Trading Cash Instruments Assets [Member] | Other Cash Instruments [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value, Beginning Balance 303 159 128 97
Net realized gains / (losses) (1) (31) 9 (24)
Net unrealized gains / (losses) 6 (82) (25) (74)
Purchases 20 61 56 159
Sales (207) (13) (84) (40)
Settlements (7) (6) (19) (27)
Transfers into level 3 17 143 47 127
Transfers out of level 3 (24) (20) (5) (7)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value, Ending Balance 107 211 107 211
Trading Cash Instruments Liabilities [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability Value, Beginning Balance (156) (211) (273) (49)
Net realized gains / (losses)   (2)   1
Net unrealized gains / (losses) (79) (72) 18 (207)
Purchases 13 15 50 22
Sales (20) (16) (35) (19)
Settlements (3) 12 (2) 30
Transfers into level 3 (34) (4) (28) (24)
Transfers out of level 3 11 38 2 6
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability Value, Ending Balance $ (268) $ (240) $ (268) $ (240)