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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, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value assets $ 1,807 $ 2,046 $ 1,834 $ 2,097
Realized gains/(losses), assets 0 0 (1) (2)
Unrealized gains/(losses) included in earnings, assets 26 0 (11) 7
Unrealized gains/(losses) included in OCI, assets 0 1 26 4
Foreign exchange recognized in OCI or earnings, assets 4 3 3 5
Purchases, assets 5 45 278 157
Issuances, assets 0 0 0 0
Settlements, assets (85) (72) (263) (215)
Sales, assets 0 0 (107) (16)
Transfers into level 3, assets [1] 5 3 14 34
Transfers out of level 3, assets [1] (128) (77) (139) (122)
Ending balance, fair value assets 1,634 1,949 1,634 1,949
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets 31 (3) 4 5
Beginning balance, fair value liabilities 809 1,705 1,531 1,200
Realized gains/(losses), liabilities 5 18 21 30
Unrealized gains/(losses included in earnings, liabilities (19) (15) (44) (112)
Unrealized gains/(losses) included in OCI, liabilities 0 0 0 0
Foreign exchange recognized in OCI or earnings, liabilities 2 0 6 (16)
Purchases, liabilities 0 0 9 695
Issuances, liabilities 0 0 0 0
Settlements, liabilities (89) (85) (184) (174)
Sales, liabilities 0 0 (631) 0
Transfers into Level 3, liabilities [1] 0 0 0 0
Transfers out of Level 3, liabilities [1] 0 0 0 0
Ending balance, fair value liabilities 708 1,623 708 1,623
Change in unrealized gains/(losses) for the period included in earnings for liabilities still held, liabilities 14 (15) (31) (116)
Residential Prime Financing Receivable [Member] | Variable Interest Entity Primary Beneficiary [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value assets 1,045 1,318 1,185 1,431
Unrealized gains/(losses) included in earnings, assets 25 (12) (5) (15)
Settlements, assets (75) (62) (185) (172)
Ending balance, fair value assets 995 1,244 995 1,244
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets 25 (12) (5) (15)
Other Loans Receivable [Member] | Variable Interest Entity Primary Beneficiary [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value assets 147 108 107  
Unrealized gains/(losses) included in earnings, assets   (1) 1 (1)
Purchases, assets     146 108
Sales, assets     (107)  
Ending balance, fair value assets 147 107 147 107
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets   (1) 1 (1)
Loan Repurchase Commitments [Member] | Variable Interest Entity Primary Beneficiary [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value assets 401 388 396 379
Unrealized gains/(losses) included in earnings, assets 3 6 8 15
Ending balance, fair value assets 404 394 404 394
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets 3 6 8 15
State and municipal bonds [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value assets 124 5 41 8
Purchases, assets   45 122 45
Settlements, assets   (3) (39) (4)
Transfers into level 3, assets [1] 2   2  
Transfers out of level 3, assets (122)   (122) (2) [1]
Ending balance, fair value assets 4 47 4 47
Foreign Government Debt [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value assets 7 5 2 6
Foreign exchange recognized in OCI or earnings, assets     (1) (1)
Purchases, assets 5   10  
Settlements, assets (6)   (5)  
Ending balance, fair value assets 6 5 6 5
Corporate Obligations [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value assets 2 8 7 10
Settlements, assets (1)      
Transfers into level 3, assets [1]       15
Transfers out of level 3, assets [1]     (6) (17)
Ending balance, fair value assets 1 8 1 8
Corporate Obligations [Member] | Variable Interest Entity Primary Beneficiary [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value assets 3 35 11 55
Unrealized gains/(losses) included in earnings, assets   1 (4)  
Settlements, assets     (1) (6)
Transfers into level 3, assets [1]   3 2 3
Transfers out of level 3, assets [1]   (28) (5) (41)
Ending balance, fair value assets 3 11 3 11
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 5   3
Unrealized gains/(losses) included in earnings, assets (1)   (1) 1
Settlements, assets       (1)
Transfers into level 3, assets [1]     1 2
Transfers out of level 3, assets [1]   (5)   (5)
Commercial Mortgage Backed Securities [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value assets   1   2
Transfers into level 3, assets 1   1 [1] 1 [1]
Transfers out of level 3, assets [1]   (1)   (3)
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 2      
Unrealized gains/(losses) included in earnings, assets (1)   (1)  
Transfers into level 3, assets 2   4 [1]  
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 67 29 87
Unrealized gains/(losses) included in OCI, assets   1 18 3
Settlements, assets (3) (4) (30) (18)
Sales, assets       (8)
Transfers into level 3, assets [1]       1
Transfers out of level 3, assets [1]   (3)   (4)
Ending balance, fair value assets 17 61 17 61
Collateralized Debt Obligations [Member] | Variable Interest Entity Primary Beneficiary [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value assets 1 4 1 5
Unrealized gains/(losses) included in earnings, assets   5   5
Transfers out of level 3, assets [1]   (9)   (10)
Ending balance, fair value assets 1   1  
Other Asset Backed [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value assets 41 83 38 85
Realized gains/(losses), assets     (1) (2)
Unrealized gains/(losses) included in earnings, assets     (1)  
Unrealized gains/(losses) included in OCI, assets     8 1
Purchases, assets       4
Settlements, assets   (2) (3) (9)
Sales, assets       (8)
Transfers into level 3, assets [1]       12
Transfers out of level 3, assets [1] (3) (24) (3) (26)
Ending balance, fair value assets 38 57 38 57
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 17 6 26
Unrealized gains/(losses) included in earnings, assets     (6) 2
Settlements, assets   (1)   (5)
Transfers into level 3, assets [1]     4  
Transfers out of level 3, assets (3) (7) [1] (3) [1] (14) [1]
Ending balance, fair value assets 1 9 1 9
Medium Term Notes [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value liabilities 161 166 161 197
Unrealized gains/(losses included in earnings, liabilities   4 (4) (11)
Foreign exchange recognized in OCI or earnings, liabilities 2   6 (16)
Settlements, liabilities (57)   (57)  
Ending balance, fair value liabilities 106 170 106 170
Change in unrealized gains/(losses) for the period included in earnings for liabilities still held, liabilities 2 4 2 (27)
Credit Derivatives [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value liabilities 104 144 85 244
Realized gains/(losses), liabilities 5 18 21 30
Unrealized gains/(losses included in earnings, liabilities (19) (21)   (121)
Settlements, liabilities (5) (20) (21) (32)
Ending balance, fair value liabilities 85 121 85 121
Change in unrealized gains/(losses) for the period included in earnings for liabilities still held, liabilities 12 (21) 9 (109)
Other Derivative Liabilities [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value liabilities 21 21 18 24
Unrealized gains/(losses included in earnings, liabilities (2) 1 1 (2)
Ending balance, fair value liabilities 19 22 19 22
Change in unrealized gains/(losses) for the period included in earnings for liabilities still held, liabilities (2) 1 (1) (2)
Variable Interest Entity Notes [Member] | Variable Interest Entity Primary Beneficiary [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value liabilities 523 1,374 1,267 735
Unrealized gains/(losses included in earnings, liabilities 2 1 (41) 22
Purchases, liabilities     9 695
Settlements, liabilities (27) (65) (106) (142)
Sales, liabilities     (631)  
Ending balance, fair value liabilities 498 1,310 498 1,310
Change in unrealized gains/(losses) for the period included in earnings for liabilities still held, liabilities 2 1 (41) 22
Currency Derivatives [Member] | Variable Interest Entity Primary Beneficiary [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value assets 9 2 11  
Unrealized gains/(losses) included in earnings, assets   1 (2)  
Foreign exchange recognized in OCI or earnings, assets 4 3 4 6
Ending balance, fair value assets 13 6 13 6
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets $ 4 $ 4 $ 2 $ 6
[1] Transferred in and out at the end of the period.