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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, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value assets $ 2,122 $ 2,406 $ 2,097 $ 2,352
Realized gains/(losses), assets 0 2 (2) 1
Unrealized gains/(losses) included in earnings, assets (4) 26 7 16
Unrealized gains/(losses) included in OCI, assets 3 25 2 31
Foreign exchange recognized in OCI or earnings, assets 2 0 3 0
Purchases, assets 0 17 112 22
Issuances, assets   0   0
Settlements, assets (76) (83) (144) (158)
Sales, assets 0 (50) (16) (67)
Transfers into level 3, assets [1] 23 20 23 180
Transfers out of level 3, assets [1] (24) (68) (36) (82)
Ending balance, fair value assets 2,046 2,295 2,046 2,295
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets (1) 40 10 46
Beginning balance, fair value liabilities 1,795 1,372 1,200 2,301
Realized gains/(losses), liabilities 3 23 12 394
Unrealized gains/(losses included in earnings, liabilities (71) 52 (97) (761)
Unrealized gains/(losses) included in OCI, liabilities 0 0 0 0
Foreign exchange recognized in OCI or earnings, liabilities 7 (1) (16) (1)
Purchases, liabilities 0 0 695 0
Issuances, liabilities 0 3 0 3
Settlements, liabilities (29) (54) (89) (500)
Sales, liabilities [2] 0 0 0 (41)
Transfers into Level 3, liabilities 0 [1] 0 [1] 0 0
Transfers out of Level 3, liabilities 0 [1] 0 [1] 0 0
Ending balance, fair value liabilities 1,705 1,395 1,705 1,395
Change in unrealized gains/(losses) for the period included in earnings for liabilities still held, liabilities (54) 52 (101) 44
Residential Prime Financing Receivable [Member] | Variable Interest Entity Primary Beneficiary [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value assets 1,372 1,557 1,431 1,612
Unrealized gains/(losses) included in earnings, assets   37 (3) 36
Settlements, assets (54) (55) (110) (109)
Ending balance, fair value assets 1,318 1,539 1,318 1,539
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets   37 (3) 36
Other Loans Receivable [Member] | Variable Interest Entity Primary Beneficiary [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value assets 108   0  
Realized gains/(losses), assets 0      
Purchases, assets     108  
Ending balance, fair value assets 108   108  
Loan Repurchase Commitments [Member] | Variable Interest Entity Primary Beneficiary [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value assets 385 364 379 359
Unrealized gains/(losses) included in earnings, assets 3 (1) 9 4
Ending balance, fair value assets 388 363 388 363
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets 3 (1) 9 4
State and municipal bonds [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value assets 6 62 8 19
Unrealized gains/(losses) included in OCI, assets   1   1
Settlements, assets (1)   (1) (2)
Sales, assets   (4)   (3)
Transfers into level 3, assets [1]       44
Transfers out of level 3, assets   (2) [1] (2) [1] (2)
Ending balance, fair value assets 5 57 5 57
Foreign Government Debt [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value assets 6 7 6 12
Settlements, assets (1) (4) (1) (9)
Transfers into level 3, assets [1]   2   2
Ending balance, fair value assets 5 5 5 5
Corporate Obligations [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value assets 10 30 10 48
Realized gains/(losses), assets   4   3
Unrealized gains/(losses) included in earnings, assets   2   3
Unrealized gains/(losses) included in OCI, assets   (3)   (4)
Purchases, assets   6   6
Settlements, assets       (2)
Sales, assets   (4)   (22)
Transfers into level 3, assets 8   8 [1] 3 [1]
Transfers out of level 3, assets (10) (1) [1] (10) [1] (1) [1]
Ending balance, fair value assets 8 34 8 34
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets   2   2
Corporate Obligations [Member] | Variable Interest Entity Primary Beneficiary [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value assets 53 64 55 48
Unrealized gains/(losses) included in earnings, assets (1)   (1)  
Settlements, assets (3) (2) (5) (3)
Transfers into level 3, assets [1]       17
Transfers out of level 3, assets (14)   (14)  
Ending balance, fair value assets 35 62 35 62
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets       1
Residential Mortgage Backed Agency [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value assets   29   0
Transfers into level 3, assets [1]   8   37
Transfers out of level 3, assets [1]   (29)   (29)
Ending balance, fair value assets   8   8
Residential Mortgage Backed Non Agency [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value assets       6
Unrealized gains/(losses) included in OCI, assets       (1)
Transfers out of level 3, assets [1]       (5)
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 5 3 4
Unrealized gains/(losses) included in earnings, assets   (1) 1 (1)
Settlements, assets   (1) (1) (1)
Transfers into level 3, assets 2 1 [1] 2 [1] 2 [1]
Ending balance, fair value assets 5 4 5 4
Commercial Mortgage Backed Securities [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value assets 1 14 2 14
Realized gains/(losses), assets 0      
Settlements, assets   (12)   (13)
Transfers into level 3, assets [1]       1
Transfers out of level 3, assets   (1) [1] (1) [1] (1)
Ending balance, fair value assets 1 1 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   3
Unrealized gains/(losses) included in earnings, assets   (3)   (3)
Ending balance, fair value assets   0   0
Collateralized Debt Obligations [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value assets 74 115 87 82
Realized gains/(losses), assets   (2)   (2)
Unrealized gains/(losses) included in earnings, assets   1   1
Unrealized gains/(losses) included in OCI, assets 1 24 1 27
Purchases, assets       5
Settlements, assets (9) (3) (14) (5)
Sales, assets   (41) (8) (41)
Transfers into level 3, assets 1 2 [1] 1 [1] 35 [1]
Transfers out of level 3, assets [1]   (1)   (7)
Ending balance, fair value assets 67 95 67 95
Collateralized Debt Obligations [Member] | Variable Interest Entity Primary Beneficiary [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value assets 4 14 5 22
Realized gains/(losses), assets 0      
Unrealized gains/(losses) included in earnings, assets   (7)   (10)
Settlements, assets   (2) (1) (4)
Transfers into level 3, assets   1   1
Transfers out of level 3, assets [1]       (3)
Ending balance, fair value assets 4 6 4 6
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets       1
Other Asset Backed [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value assets 74 85 85 58
Realized gains/(losses), assets     (2)  
Unrealized gains/(losses) included in OCI, assets 2 3 1 8
Purchases, assets   11 4 11
Settlements, assets (5) (2) (7) (4)
Sales, assets   (1) (8) (1)
Transfers into level 3, assets 12 6 [1] 12 [1] 30 [1]
Transfers out of level 3, assets [1]   (20) (2) (20)
Ending balance, fair value assets 83 82 83 82
Other Asset Backed [Member] | Variable Interest Entity Primary Beneficiary [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value assets 21 42 26 54
Unrealized gains/(losses) included in earnings, assets (1) (4) 2 (16)
Settlements, assets (3) (2) (4) (6)
Transfers into level 3, assets [1]       4
Transfers out of level 3, assets   (10) (7) [1] (10)
Ending balance, fair value assets 17 26 17 26
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 180 215 197 203
Unrealized gains/(losses included in earnings, liabilities (21) 3 (15) 15
Foreign exchange recognized in OCI or earnings, liabilities 7 (1) (16) (1)
Ending balance, fair value liabilities 166 217 166 217
Change in unrealized gains/(losses) for the period included in earnings for liabilities still held, liabilities (14) 2 (31) 14
Credit Derivatives [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value liabilities 207 309 244 1,147
Realized gains/(losses), liabilities 3 23 12 364
Unrealized gains/(losses included in earnings, liabilities (63) 23 (100) (815)
Settlements, liabilities (3) (23) (12) (364)
Ending balance, fair value liabilities 144 332 144 332
Change in unrealized gains/(losses) for the period included in earnings for liabilities still held, liabilities (53) 24 (88) (6)
Other Derivative Liabilities [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value liabilities 21 31 24 0
Realized gains/(losses), liabilities       30
Unrealized gains/(losses included in earnings, liabilities 0 2 (3) 3
Ending balance, fair value liabilities 21 33 21 33
Change in unrealized gains/(losses) for the period included in earnings for liabilities still held, liabilities   2 (3) 3
Variable Interest Entity Notes [Member] | Liabilities Of Consolidated Vies [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value liabilities 1,387 812 735 940
Unrealized gains/(losses included in earnings, liabilities 13 18 21 36
Purchases, liabilities     695  
Issuances, liabilities   3   3
Settlements, liabilities (26) (31) (77) (136)
Sales, liabilities       (41)
Ending balance, fair value liabilities 1,374 802 1,374 802
Change in unrealized gains/(losses) for the period included in earnings for liabilities still held, liabilities 13 18 21 33
Currency Derivatives [Member] | Variable Interest Entity Primary Beneficiary [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value assets 5   0  
Unrealized gains/(losses) included in earnings, assets (5)   (1)  
Foreign exchange recognized in OCI or earnings, assets 2   3  
Ending balance, fair value assets 2   2  
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets $ (3)   $ 2  
Currency Derivatives [Member] | Liabilities Of Consolidated Vies [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value liabilities   5   11
Unrealized gains/(losses included in earnings, liabilities   6   0
Ending balance, fair value liabilities   11   11
Change in unrealized gains/(losses) for the period included in earnings for liabilities still held, liabilities   6   0
Perpetual Debt And Equity Securities [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value assets   15   11
Unrealized gains/(losses) included in earnings, assets   2   2
Transfers into level 3, assets [1]       4
Transfers out of level 3, assets   (4)   (4) [1]
Ending balance, fair value assets   13   13
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets   $ 2   $ 2
[1] (1) - Transferred in and out at the end of the period.
[2] Primarily relates to the deconsolidation of VIEs.