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Trading Cash Instruments - Cash Instruments, Level 3 Rollforward (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
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 $ 1,689 $ 1,213
Net realized gains / (losses) 89 188
Net unrealized gains / (losses) (35) (89)
Purchases 522 831
Sales (885) (607)
Settlements (252) (423)
Transfers into level 3 256 698
Transfers out of level 3 (142) (122)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value, Ending Balance 1,242 1,689
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 332 260
Net realized gains / (losses) 5 28
Net unrealized gains / (losses) (17) (28)
Purchases 49 119
Sales (153) (122)
Settlements (48) (76)
Transfers into level 3 37 156
Transfers out of level 3 (14) (5)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value, Ending Balance 191 332
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 348 436
Net realized gains / (losses) 14 28
Net unrealized gains / (losses) 28 29
Purchases 111 109
Sales (223) (205)
Settlements (37) (85)
Transfers into level 3 19 99
Transfers out of level 3 (29) (63)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value, Ending Balance 231 348
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 912 450
Net realized gains / (losses) 58 126
Net unrealized gains / (losses) (27) (96)
Purchases 291 559
Sales (458) (246)
Settlements (134) (231)
Transfers into level 3 142 395
Transfers out of level 3 (92) (45)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value, Ending Balance 692 912
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 97 67
Net realized gains / (losses) 12 6
Net unrealized gains / (losses) (19) 6
Purchases 71 44
Sales (51) (34)
Settlements (33) (31)
Transfers into level 3 58 48
Transfers out of level 3 (7) (9)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value, Ending Balance 128 97
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 (49) (68)
Net realized gains / (losses) 10 6
Net unrealized gains / (losses) (236) (7)
Purchases 56 41
Sales (35) (26)
Settlements   8
Transfers into level 3 (24) (7)
Transfers out of level 3 5 4
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability Value, Ending Balance $ (273) $ (49)