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Cash Instruments - Cash Instruments, Level 3 Rollforward (Detail) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
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 $ 18,131 $ 26,195 $ 18,131 $ 28,650
Net Realized Gains / (Losses) 194 231 503 821
Net Unrealized Gains / (Losses) 461 (52) 358 844
Purchases 519 861 2,941 2,810
Sales (703) (709) (2,002) (3,262)
Settlements (1,081) (1,426) (2,922) (4,888)
Transfers Into Level 3 1,327 694 2,696 2,131
Transfers Out Of Level 3 (707) (5,489) (1,564) (6,801)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value, Ending Balance 18,141 20,305 18,141 20,305
Cash Instruments Assets [Member] | Non-U.S. Government and Agency Obligations [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 61 21 12 136
Net Realized Gains / (Losses)     (4) 9
Net Unrealized Gains / (Losses) 2   10  
Purchases     17 1
Sales (5)   (11) (35)
Settlements 1 (9)   (24)
Transfers Into Level 3 1 1 36  
Transfers Out Of Level 3       (74)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value, Ending Balance 60 13 60 13
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 2,112 2,134 1,924 3,275
Net Realized Gains / (Losses) 12 22 58 120
Net Unrealized Gains / (Losses) 59 28 14 91
Purchases 46 232 491 429
Sales (97) (100) (292) (605)
Settlements (144) (131) (459) (1,332)
Transfers Into Level 3 119 87 516 340
Transfers Out Of Level 3 (116) (167) (261) (213)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value, Ending Balance 1,991 2,105 1,991 2,105
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 1,300 2,717 1,765 2,545
Net Realized Gains / (Losses) 15 24 38 115
Net Unrealized Gains / (Losses) (5) 29 45 19
Purchases 76 91 297 387
Sales (123) (238) (780) (639)
Settlements (85) (76) (233) (255)
Transfers Into Level 3 95 69 120 158
Transfers Out Of Level 3 (278) (976) (257) (690)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value, Ending Balance 995 1,640 995 1,640
Cash Instruments Assets [Member] | Bank Loans and Bridge Loans [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 2,911 5,377 3,150 6,973
Net Realized Gains / (Losses) 59 55 112 228
Net Unrealized Gains / (Losses) 49 (77) (18) (177)
Purchases 112 243 452 760
Sales (37) (43) (148) (833)
Settlements (432) (574) (1,090) (1,481)
Transfers Into Level 3 118 152 457 389
Transfers Out Of Level 3 (75) (1,372) (210) (2,098)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value, Ending Balance 2,705 3,761 2,705 3,761
Cash Instruments Assets [Member] | Corporate Debt Securities [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 2,422 2,595 2,092 3,633
Net Realized Gains / (Losses) 48 51 132 128
Net Unrealized Gains / (Losses) 58 (34) 82 (58)
Purchases 166 95 501 455
Sales (285) (153) (329) (448)
Settlements (215) (19) (463) (399)
Transfers Into Level 3 225 161 492 345
Transfers Out Of Level 3 (62) (378) (150) (1,338)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value, Ending Balance 2,357 2,318 2,357 2,318
Cash Instruments Assets [Member] | State and Municipal Obligations [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 92 143 101 110
Net Realized Gains / (Losses) 1   2 3
Net Unrealized Gains / (Losses)       2
Purchases 4 7 9 11
Sales (12) (9) (31) (21)
Settlements (2)   (2) (2)
Transfers Into Level 3 10 12 25 12
Transfers Out Of Level 3 (1) (64) (12) (26)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value, Ending Balance 92 89 92 89
Cash Instruments Assets [Member] | Other Debt Obligations [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 528 740 538 870
Net Realized Gains / (Losses) 7 2 27 21
Net Unrealized Gains / (Losses) 7 4 (27) 5
Purchases 19 16 217 91
Sales (7) (63) (110) (192)
Settlements (39) (102) (120) (82)
Transfers Into Level 3 55   42 2
Transfers Out Of Level 3 (6) (56) (3) (174)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value, Ending Balance 564 541 564 541
Cash Instruments Assets [Member] | Equities and Convertible Debentures [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 8,705 12,457 8,549 11,108
Net Realized Gains / (Losses) 52 77 138 197
Net Unrealized Gains / (Losses) 291 (2) 252 962
Purchases 96 177 957 676
Sales (137) (93) (301) (489)
Settlements (165) (514) (555) (1,313)
Transfers Into Level 3 704 212 1,008 885
Transfers Out Of Level 3 (169) (2,476) (671) (2,188)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value, Ending Balance 9,377 9,838 9,377 9,838
Cash Instruments Assets [Member] | Commercial Paper, Certificates of Deposit, Time Deposits and Other Money Market 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   11    
Sales   (10)    
Settlements   (1)    
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 (123) (178) (193) (244)
Net Realized Gains / (Losses) 25 13 27 12
Net Unrealized Gains / (Losses) 18 (31) 32 (26)
Purchases 51 102 88 170
Sales (38) (35) (61) (45)
Settlements 1 3 (6) (6)
Transfers Into Level 3 (26) (98) (9) (121)
Transfers Out Of Level 3   5 30 41
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability Value, Ending Balance $ (92) $ (219) $ (92) $ (219)