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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, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value assets $ 2,122 $ 1,807 $ 1,552 $ 1,834
Realized gains/(losses), assets       (1)
Unrealized gains/(losses) included in earnings, assets 8 26 65 (11)
Unrealized gains/(losses) included in OCI, assets     2 26
Foreign exchange recognized in OCI or earnings, assets 1 4 (4) 3
Purchases, assets 17 5 736 278
Settlements, assets (64) (85) (268) (263)
Sales, assets (3)   (3) (107)
Transfers into level 3, assets   5 18 14
Transfers out of level 3, assets (7) (128) (24) (139)
Ending balance, fair value assets 2,074 1,634 2,074 1,634
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets 9 31 61 4
Beginning balance, fair value liabilities 698 809 661 1,531
Realized gains/(losses), liabilities 7 5 41 21
Unrealized gains/(losses included in earnings, liabilities (2) (19) 98 (44)
Foreign exchange recognized in OCI or earnings, liabilities 5 2 13 6
Purchases, liabilities 6   6 9
Settlements, liabilities (21) (89) (126) (184)
Sales, liabilities (51)   (51) (631)
Ending balance, fair value liabilities 642 708 642 708
Change in unrealized gains/(losses) for the period included in earnings for liabilities still held, liabilities 3 14 113 (31)
Residential Prime Financing Receivable [Member] | Variable Interest Entity Primary Beneficiary [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value assets 815 1,045 916 1,185
Unrealized gains/(losses) included in earnings, assets 2 25 29 (5)
Settlements, assets (58) (75) (186) (185)
Ending balance, fair value assets 759 995 759 995
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets 2 25 29 (5)
Corporate Loans Receivable [Member] | Variable Interest Entity Primary Beneficiary [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value assets 875 147 150 107
Unrealized gains/(losses) included in earnings, assets 4   36 1
Purchases, assets     719 146
Settlements, assets (6)   (32)  
Sales, assets       (107)
Ending balance, fair value assets 873 147 873 147
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets 4   36 1
Loan Repurchase Commitments [Member] | Variable Interest Entity Primary Beneficiary [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value assets 407 401 404 396
Unrealized gains/(losses) included in earnings, assets (1) 3 2 8
Ending balance, fair value assets 406 404 406 404
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets (1) 3 2 8
State and municipal bonds [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value assets   124   41
Purchases, assets       122
Settlements, assets       (39)
Transfers into level 3, assets   2 1 2
Transfers out of level 3, assets   (122) (1) (122)
Ending balance, fair value assets   4   4
Foreign Government Debt [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value assets   7   2
Foreign exchange recognized in OCI or earnings, assets       (1)
Purchases, assets   5   10
Settlements, assets   (6)   (5)
Ending balance, fair value assets   6   6
Corporate Obligations [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value assets   2 2 7
Settlements, assets   (1) 0  
Transfers out of level 3, assets     (2) (6)
Ending balance, fair value assets   1   1
Corporate Obligations [Member] | Variable Interest Entity Primary Beneficiary [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value assets   3   11
Unrealized gains/(losses) included in earnings, assets       (4)
Settlements, assets     (2) (1)
Transfers into level 3, assets     6 2
Transfers out of level 3, assets     (4) (5)
Ending balance, fair value assets   3   3
Residential Mortgage Backed Non Agency [Member] | Variable Interest Entity Primary Beneficiary [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value assets   1    
Unrealized gains/(losses) included in earnings, assets   (1)   (1)
Transfers into level 3, assets       1
Commercial Mortgage Backed Securities [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value assets 7      
Transfers into level 3, assets   1 7 1
Transfers out of level 3, assets (7)   (7)  
Ending balance, fair value assets   1   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 2    
Unrealized gains/(losses) included in earnings, assets   (1)   (1)
Sales, assets (3)   (3)  
Transfers into level 3, assets   2 3 4
Ending balance, fair value assets   3   3
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets   (1)   (1)
Collateralized Debt Obligations [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value assets   20 15 29
Unrealized gains/(losses) included in OCI, assets       18
Settlements, assets   (3) (7) (30)
Transfers out of level 3, assets     (8)  
Ending balance, fair value assets   17   17
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
Ending balance, fair value assets 1 1 1 1
Other Asset Backed [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value assets 5 41 44 38
Realized gains/(losses), assets       (1)
Unrealized gains/(losses) included in earnings, assets       (1)
Unrealized gains/(losses) included in OCI, assets     2 8
Settlements, assets     (41) (3)
Transfers out of level 3, assets   (3)   (3)
Ending balance, fair value assets 5 38 5 38
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets       (1)
Other Asset Backed [Member] | Variable Interest Entity Primary Beneficiary [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value assets   4 1 6
Unrealized gains/(losses) included in earnings, assets       (6)
Transfers into level 3, assets     1 4
Transfers out of level 3, assets   (3) (2) (3)
Ending balance, fair value assets   1   1
Medium Term Notes [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value liabilities 123 161 101 161
Unrealized gains/(losses included in earnings, liabilities (1)   13 (4)
Foreign exchange recognized in OCI or earnings, liabilities 5 2 13 6
Settlements, liabilities   (57)   (57)
Ending balance, fair value liabilities 127 106 127 106
Change in unrealized gains/(losses) for the period included in earnings for liabilities still held, liabilities 4 2 26 2
Credit Derivatives [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value liabilities 80 104 64 85
Realized gains/(losses), liabilities 7 5 41 21
Unrealized gains/(losses included in earnings, liabilities (6) (19) 10  
Settlements, liabilities (7) (5) (41) (21)
Ending balance, fair value liabilities 74 85 74 85
Change in unrealized gains/(losses) for the period included in earnings for liabilities still held, liabilities (6) 12 12 9
Other Derivative Liabilities [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value liabilities 4 21 20 18
Unrealized gains/(losses included in earnings, liabilities   (2) 18 1
Settlements, liabilities     (34)  
Ending balance, fair value liabilities 4 19 4 19
Change in unrealized gains/(losses) for the period included in earnings for liabilities still held, liabilities   (2) 18 (1)
Variable Interest Entity Notes [Member] | Variable Interest Entity Primary Beneficiary [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value liabilities 491 523 476 1,267
Unrealized gains/(losses included in earnings, liabilities 4 2 56 (41)
Purchases, liabilities       9
Settlements, liabilities (14) (27) (51) (106)
Sales, liabilities (51)   (51) (631)
Ending balance, fair value liabilities 430 498 430 498
Change in unrealized gains/(losses) for the period included in earnings for liabilities still held, liabilities 4 2 56 (41)
Currency Derivatives [Member] | Variable Interest Entity Primary Beneficiary [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value assets 9 9 19 11
Unrealized gains/(losses) included in earnings, assets 3   (2) (2)
Foreign exchange recognized in OCI or earnings, assets 1 4 (4) 4
Ending balance, fair value assets 13 13 13 13
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets 4 $ 4 (6) $ 2
Other Assets [Member] | Variable Interest Entity Primary Beneficiary [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Purchases, assets 17   17  
Ending balance, fair value assets 17   17  
Other Payable [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Unrealized gains/(losses included in earnings, liabilities 1   1  
Purchases, liabilities 6   6  
Ending balance, fair value liabilities 7   7  
Change in unrealized gains/(losses) for the period included in earnings for liabilities still held, liabilities $ 1   $ 1