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Fair Value Of Financial Instruments (Changes In Level 3 Assets And Liabilities Measured At Fair Value On A Recurring Basis) (Detail) - Fair Value Inputs Level 3 [Member] - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value assets $ 2,046 $ 2,295 $ 2,097 $ 2,352
Realized gains/(losses), assets 0 0 (2) 1
Unrealized gains/(losses) included in earnings, assets 0 14 7 30
Unrealized gains/(losses) included in OCI, assets 1 (4) 4 27
Foreign exchange recognized in OCI or earnings, assets 3 (1) 5 (1)
Purchases, assets 45 3 157 25
Issuances, assets 0 0   0
Settlements, assets (72) (80) (215) (241)
Sales, assets 0 (1) (16) (68)
Transfers into level 3, assets [1] 3 55 34 238
Transfers out of level 3, assets [1] (77) (1) (122) (83)
Ending balance, fair value assets 1,949 2,280 1,949 2,280
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets (3) 14 5 59
Beginning balance, fair value liabilities 1,705 1,395 1,200 2,301
Realized gains/(losses), liabilities 18 24 30 418
Unrealized gains/(losses included in earnings, liabilities (15) (40) (112) (801)
Unrealized gains/(losses) included in OCI, liabilities 0 0 0 0
Foreign exchange recognized in OCI or earnings, liabilities 0 (18) (16) (19)
Purchases, liabilities 0 0 695 0
Issuances, liabilities 0 0 0 3
Settlements, liabilities (85) (84) (174) (584)
Sales, liabilities [2] 0 0 0 (41)
Transfers into Level 3, liabilities 0 [1] 0 [1] 0 0
Transfers out of Level 3, liabilities 0 [1] 0 [1] 0 0
Ending balance, fair value liabilities 1,623 1,277 1,623 1,277
Change in unrealized gains/(losses) for the period included in earnings for liabilities still held, liabilities (15) (24) (116) 60
Residential Prime Financing Receivable [Member] | Variable Interest Entity Primary Beneficiary [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value assets 1,318 1,539 1,431 1,612
Unrealized gains/(losses) included in earnings, assets (12) 12 (15) 48
Settlements, assets (62) (56) (172) (165)
Ending balance, fair value assets 1,244 1,495 1,244 1,495
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets (12) 12 (15) 48
Other Loans Receivable [Member] | Variable Interest Entity Primary Beneficiary [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value assets 108   0  
Unrealized gains/(losses) included in earnings, assets (1)   (1)  
Purchases, assets     108  
Ending balance, fair value assets 107   107  
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets (1)   (1)  
Loan Repurchase Commitments [Member] | Variable Interest Entity Primary Beneficiary [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value assets 388 363 379 359
Unrealized gains/(losses) included in earnings, assets 6 2 15 6
Ending balance, fair value assets 394 365 394 365
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets 6 2 15 6
State and municipal bonds [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value assets 5 57 8 19
Unrealized gains/(losses) included in OCI, assets       1
Purchases, assets 45   45  
Settlements, assets (3) (1) (4) (3)
Sales, assets       (3)
Transfers into level 3, assets   2   46 [1]
Transfers out of level 3, assets     (2) [1] (2)
Ending balance, fair value assets 47 58 47 58
Foreign Government Debt [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value assets 5 5 6 12
Foreign exchange recognized in OCI or earnings, assets     (1)  
Settlements, assets 0 (6)   (15)
Transfers into level 3, assets [1]   7   9
Ending balance, fair value assets 5 6 5 6
Corporate Obligations [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value assets 8 34 10 48
Realized gains/(losses), assets       3
Unrealized gains/(losses) included in earnings, assets       3
Unrealized gains/(losses) included in OCI, assets       (4)
Foreign exchange recognized in OCI or earnings, assets   (1)   (1)
Purchases, assets   3   9
Settlements, assets   (1)   (3)
Sales, assets   (1)   (23)
Transfers into level 3, assets 0 [1] 4 15 [1] 7 [1]
Transfers out of level 3, assets [1]     (17) (1)
Ending balance, fair value assets 8 38 8 38
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets       2
Corporate Obligations [Member] | Variable Interest Entity Primary Beneficiary [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value assets 35 62 55 48
Unrealized gains/(losses) included in earnings, assets 1      
Settlements, assets     (6) (4)
Transfers into level 3, assets 3 7 3 25 [1]
Transfers out of level 3, assets (28)   (41)  
Ending balance, fair value assets 11 69 11 69
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets       0
Residential Mortgage Backed Agency [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value assets   8   0
Settlements, assets   (8)   (8)
Transfers into level 3, assets [1]       37
Transfers out of level 3, assets [1]       (29)
Ending balance, fair value assets   0   0
Residential Mortgage Backed Non Agency [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value assets       6
Unrealized gains/(losses) included in OCI, assets       (1)
Transfers out of level 3, assets [1]       (5)
Residential Mortgage Backed Non Agency [Member] | Variable Interest Entity Primary Beneficiary [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value assets 5 4 3 4
Unrealized gains/(losses) included in earnings, assets   0 1 (1)
Settlements, assets     (1) (1)
Transfers into level 3, assets [1]     2 2
Transfers out of level 3, assets (5)   (5)  
Ending balance, fair value assets 0 4 0 4
Commercial Mortgage Backed Securities [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value assets 1 1 2 14
Settlements, assets   0   (14)
Transfers into level 3, assets     1 2 [1]
Transfers out of level 3, assets (1) [1]   (3) [1] (1)
Ending balance, fair value assets 0 1 0 1
Commercial Mortgage Backed Securities [Member] | Variable Interest Entity Primary Beneficiary [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value assets       3
Unrealized gains/(losses) included in earnings, assets       (3)
Collateralized Debt Obligations [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value assets 67 95 87 82
Realized gains/(losses), assets       (2)
Unrealized gains/(losses) included in earnings, assets       1
Unrealized gains/(losses) included in OCI, assets 1   3 27
Purchases, assets       5
Settlements, assets (4) (3) (18) (9)
Sales, assets     (8) (41)
Transfers into level 3, assets [1]     1 36
Transfers out of level 3, assets (3) [1]   (4) (7) [1]
Ending balance, fair value assets 61 92 61 92
Collateralized Debt Obligations [Member] | Variable Interest Entity Primary Beneficiary [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value assets 4 6 5 22
Unrealized gains/(losses) included in earnings, assets 5 0 5 (10)
Settlements, assets       (4)
Transfers into level 3, assets       1
Transfers out of level 3, assets (9) [1]   (10) (3) [1]
Ending balance, fair value assets 0 6 0 6
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets       1
Other Asset Backed [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value assets 83 82 85 58
Realized gains/(losses), assets     (2)  
Unrealized gains/(losses) included in OCI, assets   (4) 1 4
Purchases, assets     4 11
Settlements, assets (2) (4) (9) (8)
Sales, assets     (8) (1)
Transfers into level 3, assets [1]   21 12 51
Transfers out of level 3, assets [1] (24) (1) (26) (21)
Ending balance, fair value assets 57 94 57 94
Other Asset Backed [Member] | Variable Interest Entity Primary Beneficiary [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value assets 17 26 26 54
Unrealized gains/(losses) included in earnings, assets     2 (16)
Settlements, assets (1) (1) (5) (7)
Transfers into level 3, assets   14   18 [1]
Transfers out of level 3, assets (7) [1]   (14) [1] (10)
Ending balance, fair value assets 9 39 9 39
Medium Term Notes [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value liabilities 166 217 197 203
Unrealized gains/(losses included in earnings, liabilities 4 2 (11) 17
Foreign exchange recognized in OCI or earnings, liabilities 0 (17) (16) (18)
Ending balance, fair value liabilities 170 202 170 202
Change in unrealized gains/(losses) for the period included in earnings for liabilities still held, liabilities 4 (15) (27) (1)
Credit Derivatives [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value liabilities 144 332 244 1,147
Realized gains/(losses), liabilities 18 24 30 388
Unrealized gains/(losses included in earnings, liabilities (21) (48) (121) (863)
Settlements, liabilities (20) (24) (32) (388)
Ending balance, fair value liabilities 121 284 121 284
Change in unrealized gains/(losses) for the period included in earnings for liabilities still held, liabilities (21) (14) (109) 20
Other Derivative Liabilities [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value liabilities 21 33 24 0
Realized gains/(losses), liabilities       30
Unrealized gains/(losses included in earnings, liabilities 1 5 (2) 8
Ending balance, fair value liabilities 22 38 22 38
Change in unrealized gains/(losses) for the period included in earnings for liabilities still held, liabilities 1 5 (2) 8
Variable Interest Entity Notes [Member] | Liabilities Of Consolidated Vies [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value liabilities 1,374 802 735 940
Unrealized gains/(losses included in earnings, liabilities 1 4 22 40
Purchases, liabilities     695  
Issuances, liabilities       3
Settlements, liabilities (65) (60) (142) (196)
Sales, liabilities       (41)
Ending balance, fair value liabilities 1,310 746 1,310 746
Change in unrealized gains/(losses) for the period included in earnings for liabilities still held, liabilities 1 4 22 37
Currency Derivatives [Member] | Variable Interest Entity Primary Beneficiary [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value assets 2   0  
Unrealized gains/(losses) included in earnings, assets 1      
Foreign exchange recognized in OCI or earnings, assets 3   6  
Ending balance, fair value assets 6   6  
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets $ 4   $ 6  
Currency Derivatives [Member] | Liabilities Of Consolidated Vies [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value liabilities   11   11
Unrealized gains/(losses included in earnings, liabilities   (3)   (3)
Foreign exchange recognized in OCI or earnings, liabilities   (1)   (1)
Ending balance, fair value liabilities   7   7
Change in unrealized gains/(losses) for the period included in earnings for liabilities still held, liabilities   (4)   (4)
Perpetual Debt And Equity Securities [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value assets   13   11
Unrealized gains/(losses) included in earnings, assets   0   2
Transfers into level 3, assets [1]       4
Transfers out of level 3, assets [1]       (4)
Ending balance, fair value assets   $ 13   13
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets       $ 2
[1] (1) - Transferred in and out at the end of the period.
[2] Primarily relates to the deconsolidation of VIEs.