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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, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value assets $ 613 $ 1,138 $ 637 $ 2,140
Realized gains/(losses), assets 0 0 (1) 0
Unrealized gains/(losses) included in earnings, assets 45 23 94 43
Unrealized gains/(losses) included in OCI, assets 0 0 0 0
Foreign exchange recognized in OCI or earnings, assets 1 (2) 0 (2)
Purchases, assets 0 0 0 5
Issuances, assets 0 0 0 0
Settlements, assets (6) (24) (25) (115)
Sales, assets 0 (251) (49) (1,178)
Transfers into level 3, assets 0 7 0 13
Transfers out of level 3, assets (3) (2) (6) (17)
Ending balance, fair value assets 650 889 650 889
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets 45 22 89 27
Beginning balance, fair value liabilities 489 578 513 595
Realized gains/(losses), liabilities 24 11 32 66
Unrealized gains/(losses included in earnings, liabilities 0 1 43 (44)
Unrealized gains/(losses) included in OCI, liabilities 5 0 4 41
Foreign exchange recognized in OCI or earnings, liabilities (4) 4 (3) (4)
Purchases, liabilities 0 0 0 0
Issuances, liabilities 3 1 7 7
Settlements, liabilities (19) (51) (38) (117)
Sales, liabilities 0 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 498 544 498 544
Change in unrealized gains/(losses) for the period included in earnings for liabilities still held, liabilities (4) 5 35 (48)
Residential Prime Financing Receivable [Member] | Variable Interest Entity Primary Beneficiary [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value assets 154 683 172 759
Unrealized gains/(losses) included in earnings, assets (3) 20 40 26
Settlements, assets (5) (24) (18) (106)
Sales, assets   (251) (48) (251)
Ending balance, fair value assets 146 428 146 428
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets (3) 21 35 23
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       920
Unrealized gains/(losses) included in earnings, assets       11
Settlements, assets       (6)
Sales, assets       (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 428 415 418 407
Unrealized gains/(losses) included in earnings, assets 50   60 8
Ending balance, fair value assets 478 415 478 415
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets 50   60 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 5  
Settlements, assets     (2) (1)
Transfers into level 3, assets       6
Transfers out of level 3, assets     (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 4   7 7
Settlements, assets (1)   (4)  
Transfers into level 3, assets   7   7
Transfers out of level 3, assets (3)   (3) (7)
Ending balance, fair value assets 0 7 0 7
Commercial Mortgage Backed Securities [Member] | Variable Interest Entity Primary Beneficiary [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value assets       6
Transfers out of level 3, assets       (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
Sales, assets     (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 1 6 3 5
Realized gains/(losses), assets     (1)  
Purchases, assets       5
Settlements, assets     (1) (2)
Sales, assets       (2)
Transfers out of level 3, assets   (2)   (2)
Ending balance, fair value assets 1 4 1 4
Medium Term Notes [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value liabilities 110 149 102 115
Realized gains/(losses), liabilities   (5)   (5)
Unrealized gains/(losses included in earnings, liabilities 3 (1) 8 (1)
Unrealized gains/(losses) included in OCI, liabilities (5) 11 1 51
Foreign exchange recognized in OCI or earnings, liabilities (2) (1) (2) (7)
Settlements, liabilities   (30) (3) (30)
Ending balance, fair value liabilities 106 123 106 123
Change in unrealized gains/(losses) for the period included in earnings for liabilities still held, liabilities 1 (2) 1 (8)
Credit Derivatives [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value liabilities 18 31 33 63
Realized gains/(losses), liabilities 10 6 11 49
Unrealized gains/(losses included in earnings, liabilities (9) (4) (23) (36)
Settlements, liabilities (9) (6) (11) (49)
Ending balance, fair value liabilities 10 27 10 27
Change in unrealized gains/(losses) for the period included in earnings for liabilities still held, liabilities (9) (4) (23) (36)
Other Derivatives Liabilities [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value liabilities 16 4 7 4
Unrealized gains/(losses included in earnings, liabilities 14 3 23 3
Ending balance, fair value liabilities 30 7 30 7
Change in unrealized gains/(losses) for the period included in earnings for liabilities still held, liabilities 14 3 23 3
Variable Interest Entity Notes [Member] | Liabilities Of Consolidated Vies [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value liabilities 342 389 366 406
Realized gains/(losses), liabilities 14 10 21 22
Unrealized gains/(losses included in earnings, liabilities (9) 3 33 (12)
Unrealized gains/(losses) included in OCI, liabilities 10 (11) 3 (10)
Foreign exchange recognized in OCI or earnings, liabilities (2) 5 (1) 3
Issuances, liabilities 3 1 7 7
Settlements, liabilities (10) (15) (21) (34)
Sales, liabilities     (60)  
Ending balance, fair value liabilities 348 382 348 382
Change in unrealized gains/(losses) for the period included in earnings for liabilities still held, liabilities (11) 8 32 (9)
Currency Derivatives [Member] | Variable Interest Entity Primary Beneficiary [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value assets 11 14 17 19
Unrealized gains/(losses) included in earnings, assets (4) 2 (9) (3)
Foreign exchange recognized in OCI or earnings, assets 1 (2)   (2)
Ending balance, fair value assets 8 14 8 14
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets (4)   (9) (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 2 1 3 1
Ending balance, fair value assets 17 15 17 15
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets 2 1 3 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 2
Settlements, liabilities     (3) (4)
Ending balance, fair value liabilities 4 $ 5 4 5
Change in unrealized gains/(losses) for the period included in earnings for liabilities still held, liabilities $ 1   $ 2 $ 2