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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, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value assets $ 1,850 $ 2,122 $ 1,834 $ 2,097
Realized gains/(losses), assets 0 0 (1) (2)
Unrealized gains/(losses) included in earnings, assets (9) (4) (38) 7
Unrealized gains/(losses) included in OCI, assets 19 3 25 2
Foreign exchange recognized in OCI or earnings, assets 0 2 0 3
Purchases, assets 127 0 272 112
Issuances, assets 0 0 0 0
Settlements, assets (77) (76) (177) (144)
Sales, assets (107) 0 (107) (16)
Transfers into level 3, assets [1] 4 23 9 23
Transfers out of level 3, assets [1] 0 (24) (10) (36)
Ending balance, fair value assets 1,807 2,046 1,807 2,046
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets (9) (1) (27) 10
Beginning balance, fair value liabilities 1,459 1,795 1,531 1,200
Realized gains/(losses), liabilities 2 3 16 12
Unrealized gains/(losses included in earnings, liabilities (15) (71) (26) (97)
Unrealized gains/(losses) included in OCI, liabilities 0 0 0 0
Foreign exchange recognized in OCI or earnings, liabilities (4) 7 4 (16)
Purchases, liabilities 0 0 9 695
Issuances, liabilities 0 0 0 0
Settlements, liabilities (2) (29) (94) (89)
Sales, liabilities (631) 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 809 1,705 809 1,705
Change in unrealized gains/(losses) for the period included in earnings for liabilities still held, liabilities (19) (54) (20) (101)
Residential Prime Financing Receivable [Member] | Variable Interest Entity Primary Beneficiary [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value assets 1,115 1,372 1,185 1,431
Unrealized gains/(losses) included in earnings, assets (16)   (30) (3)
Settlements, assets (54) (54) (110) (110)
Ending balance, fair value assets 1,045 1,318 1,045 1,318
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets (16)   (30) (3)
Other Loans Receivable [Member] | Variable Interest Entity Primary Beneficiary [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value assets 253 108 107  
Unrealized gains/(losses) included in earnings, assets 1   1  
Purchases, assets     146 108
Sales, assets (107)   (107)  
Ending balance, fair value assets 147 108 147 108
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 399 385 396 379
Unrealized gains/(losses) included in earnings, assets 2 3 5 9
Ending balance, fair value assets 401 388 401 388
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets 2 3 5 9
State and municipal bonds [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value assets 3 6 41 8
Purchases, assets 121   121  
Settlements, assets   (1) (38) (1)
Transfers out of level 3, assets [1]       (2)
Ending balance, fair value assets 124 5 124 5
Foreign Government Debt [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value assets 2 6 2 6
Purchases, assets 5   5  
Settlements, assets   (1)   (1)
Ending balance, fair value assets 7 5 7 5
Corporate Obligations [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value assets 1 10 7 10
Purchases, assets 1      
Transfers into level 3, assets [1]   8   8
Transfers out of level 3, assets [1]   (10) (5) (10)
Ending balance, fair value assets 2 8 2 8
Corporate Obligations [Member] | Variable Interest Entity Primary Beneficiary [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value assets 1 53 11 55
Unrealized gains/(losses) included in earnings, assets   (1) (5) (1)
Settlements, assets   (3)   (5)
Transfers into level 3, assets [1] 2   2  
Transfers out of level 3, assets [1]   (14) (5) (14)
Ending balance, fair value assets 3 35 3 35
Residential Mortgage Backed Non Agency [Member] | Variable Interest Entity Primary Beneficiary [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value assets   3   3
Unrealized gains/(losses) included in earnings, assets       1
Settlements, assets       (1)
Transfers into level 3, assets [1] 1 2 1 2
Ending balance, fair value assets 1 5 1 5
Commercial Mortgage Backed Securities [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value assets   1   2
Transfers out of level 3, assets [1]       (1)
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      
Transfers into level 3, assets [1]     2  
Ending balance, fair value assets 2   2  
Collateralized Debt Obligations [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value assets 26 74 29 87
Unrealized gains/(losses) included in OCI, assets 17 1 18 1
Settlements, assets (23) (9) (27) (14)
Sales, assets       (8)
Transfers into level 3, assets [1]   1   1
Ending balance, fair value assets 20 67 20 67
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
Settlements, assets       (1)
Ending balance, fair value assets 1 4 1 4
Other Asset Backed [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value assets 39 74 38 85
Realized gains/(losses), assets     (1) (2)
Unrealized gains/(losses) included in earnings, assets     (1)  
Unrealized gains/(losses) included in OCI, assets 2 2 7 1
Purchases, assets       4
Settlements, assets   (5) (2) (7)
Sales, assets       (8)
Transfers into level 3, assets [1]   12   12
Transfers out of level 3, assets [1]       (2)
Ending balance, fair value assets 41 83 41 83
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 3 21 6 26
Unrealized gains/(losses) included in earnings, assets   (1) (6) 2
Settlements, assets   (3)   (4)
Transfers into level 3, assets [1] 1   4  
Transfers out of level 3, assets [1]       (7)
Ending balance, fair value assets 4 17 4 17
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets   (1)   2
Medium Term Notes [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value liabilities 165 180 161 197
Unrealized gains/(losses included in earnings, liabilities   (21) (4) (15)
Foreign exchange recognized in OCI or earnings, liabilities (4) 7 4 (16)
Ending balance, fair value liabilities 161 166 161 166
Change in unrealized gains/(losses) for the period included in earnings for liabilities still held, liabilities (4) (14)   (31)
Credit Derivatives [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value liabilities 99 207 85 244
Realized gains/(losses), liabilities 2 3 16 12
Unrealized gains/(losses included in earnings, liabilities 5 (63) 19 (100)
Settlements, liabilities (2) (3) (16) (12)
Ending balance, fair value liabilities 104 144 104 144
Change in unrealized gains/(losses) for the period included in earnings for liabilities still held, liabilities 5 (53) 22 (88)
Other Derivative Liabilities [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value liabilities 19 21 18 24
Unrealized gains/(losses included in earnings, liabilities 2   3 (3)
Ending balance, fair value liabilities 21 21 21 21
Change in unrealized gains/(losses) for the period included in earnings for liabilities still held, liabilities 2   3 (3)
Variable Interest Entity Notes [Member] | Variable Interest Entity Primary Beneficiary [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value liabilities 1,176 1,387 1,267 735
Unrealized gains/(losses included in earnings, liabilities (22) 13 (44) 21
Purchases, liabilities     9 695
Settlements, liabilities   (26) (78) (77)
Sales, liabilities (631)   (631)  
Ending balance, fair value liabilities 523 1,374 523 1,374
Change in unrealized gains/(losses) for the period included in earnings for liabilities still held, liabilities (22) 13 (45) 21
Currency Derivatives [Member] | Variable Interest Entity Primary Beneficiary [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value assets 5 5 11  
Unrealized gains/(losses) included in earnings, assets 4 (5) (2) (1)
Foreign exchange recognized in OCI or earnings, assets   2   3
Ending balance, fair value assets 9 2 9 2
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets $ 4 $ (3) $ (2) $ 2
[1] Transferred in and out at the end of the period.