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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 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value assets $ 669 $ 2,117 $ 637 $ 2,140
Realized gains/(losses), assets (1) 0 (1) 0
Unrealized gains/(losses) included in earnings, assets 6 (8) 49 20
Unrealized gains/(losses) included in OCI, assets 0 0 0 0
Foreign exchange recognized in OCI or earnings, assets 0 3 (1) 0
Purchases, assets 0 2 0 5
Issuances, assets 0 0 0 0
Settlements, assets (9) (41) (19) (90)
Sales, assets (49) (925) (49) (928)
Transfers into level 3, assets 0 3 0 6
Transfers out of level 3, assets (3) (13) (3) (15)
Ending balance, fair value assets 613 1,138 613 1,138
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets 4 (5) 43 9
Beginning balance, fair value liabilities 532 604 513 595
Realized gains/(losses), liabilities (1) 29 8 56
Unrealized gains/(losses included in earnings, liabilities 14 (31) 43 (46)
Unrealized gains/(losses) included in OCI, liabilities 9 24 (1) 41
Foreign exchange recognized in OCI or earnings, liabilities 3 (18) 1 (8)
Purchases, liabilities 0 0 0 0
Issuances, liabilities 0 1 4 6
Settlements, liabilities (8) (31) (19) (66)
Sales, liabilities (60) 0 (60) 0
Transfers into Level 3, liabilities 0 0 0 0
Transfers out of Level 3, liabilities 0 0 0 0
Ending balance, fair value liabilities 489 578 489 578
Change in unrealized gains/(losses) for the period included in earnings for liabilities still held, liabilities 17 (49) 43 (54)
Residential Prime Financing Receivable [Member] | Variable Interest Entity Primary Beneficiary [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value assets 206 737 172 759
Unrealized gains/(losses) included in earnings, assets 1 (14) 43 6
Settlements, assets (5) (40) (13) (82)
Sales, assets (48)   (48)  
Ending balance, fair value assets 154 683 154 683
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets (1) (14) 38 6
Corporate Loans Receivable and Other Instruments [Member] | Variable Interest Entity Primary Beneficiary [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value assets   925   920
Unrealized gains/(losses) included in earnings, assets       11
Settlements, assets       (6)
Sales, assets   (925)   (925)
Ending balance, fair value assets   0   0
Loan Repurchase Commitments [Member] | Variable Interest Entity Primary Beneficiary [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value assets 420 407 418 407
Unrealized gains/(losses) included in earnings, assets 8 8 10 8
Ending balance, fair value assets 428 415 428 415
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets 8 8 10 8
Corporate Obligations [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value assets       2
Transfers out of level 3, assets       (2)
Ending balance, fair value assets   0   0
Corporate Obligations [Member] | Variable Interest Entity Primary Beneficiary [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value assets 5 3 5  
Settlements, assets (2) (1) (2) (1)
Transfers into level 3, assets   3   6
Transfers out of level 3, assets (3)   (3)  
Ending balance, fair value assets 0 5 0 5
Commercial Mortgage Backed Securities [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value assets 6 7 7 7
Settlements, assets (2)   (3)  
Transfers out of level 3, assets   (7)   (7)
Ending balance, fair value assets 4 0 4 0
Commercial Mortgage Backed Securities [Member] | Variable Interest Entity Primary Beneficiary [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value assets   6   6
Transfers out of level 3, assets   (6)   (6)
Ending balance, fair value assets   0   0
Collateralized Debt Obligations [Member] | Variable Interest Entity Primary Beneficiary [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value assets 1 1 1 1
Sales, assets (1)   (1)  
Transfers out of level 3, assets       0
Ending balance, fair value assets 0 1 0 1
Other Asset Backed [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value assets 2 4 3 5
Realized gains/(losses), assets (1)   (1)  
Purchases, assets   2   5
Settlements, assets     (1) (1)
Sales, assets       (3)
Ending balance, fair value assets 1 6 1 6
Medium Term Notes [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value liabilities 106 146 102 115
Unrealized gains/(losses included in earnings, liabilities (5) (1) 5  
Unrealized gains/(losses) included in OCI, liabilities 10 15 6 40
Foreign exchange recognized in OCI or earnings, liabilities 2 (11)   (6)
Settlements, liabilities (3)   (3)  
Ending balance, fair value liabilities 110 149 110 149
Change in unrealized gains/(losses) for the period included in earnings for liabilities still held, liabilities (2) (12) 4 (6)
Credit Derivatives [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value liabilities 19 49 33 63
Realized gains/(losses), liabilities 1 25 1 44
Unrealized gains/(losses included in earnings, liabilities   (18) (14) (32)
Settlements, liabilities (2) (25) (2) (44)
Ending balance, fair value liabilities 18 31 18 31
Change in unrealized gains/(losses) for the period included in earnings for liabilities still held, liabilities   (18) (14) (32)
Other Derivatives Liabilities [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value liabilities 7 4 7 4
Unrealized gains/(losses included in earnings, liabilities 9   9  
Ending balance, fair value liabilities 16 4 16 4
Change in unrealized gains/(losses) for the period included in earnings for liabilities still held, liabilities 9   9  
Variable Interest Entity Notes [Member] | Liabilities Of Consolidated Vies [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value liabilities 397 400 366 406
Realized gains/(losses), liabilities (2) 4 7 12
Unrealized gains/(losses included in earnings, liabilities 10 (12) 42 (16)
Unrealized gains/(losses) included in OCI, liabilities (1) 9 (7) 1
Foreign exchange recognized in OCI or earnings, liabilities 1 (7) 1 (2)
Issuances, liabilities   1 4 6
Settlements, liabilities (3) (6) (11) (18)
Sales, liabilities (60)   (60)  
Ending balance, fair value liabilities 342 389 342 389
Change in unrealized gains/(losses) for the period included in earnings for liabilities still held, liabilities 10 (19) 43 (18)
Currency Derivatives [Member] | Variable Interest Entity Primary Beneficiary [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value assets 14 13 17 19
Unrealized gains/(losses) included in earnings, assets (3) (2) (5) (5)
Foreign exchange recognized in OCI or earnings, assets   3 (1)  
Ending balance, fair value assets 11 14 11 14
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets (3) 1 (6) (5)
Other Assets [Member] | Variable Interest Entity Primary Beneficiary [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value assets 15 14 14 14
Unrealized gains/(losses) included in earnings, assets   0 1 0
Foreign exchange recognized in OCI or earnings, assets   0    
Ending balance, fair value assets 15 14 15 14
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets     1  
Other Payable [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value liabilities 3 5 5 7
Unrealized gains/(losses included in earnings, liabilities     1 2
Settlements, liabilities     (3) (4)
Ending balance, fair value liabilities $ 3 $ 5 3 5
Change in unrealized gains/(losses) for the period included in earnings for liabilities still held, liabilities     $ 1 $ 2