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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, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value assets $ 2,295 $ 3,362 $ 2,352 $ 3,532
Realized gains/(losses), assets 0 (7) 1 (9)
Unrealized gains/(losses) included in earnings, assets 14 (17) 30 337
Unrealized gains/(losses) included in OCI, assets (4) 9 27 31
Foreign exchange recognized in OCI or earnings, assets (1) 3 (1) 0
Purchases, assets 3 0 25 65
Issuances, assets   0 0 0
Settlements, assets (80) (106) (241) (403)
Sales, assets (1) (6) (68) (373)
Transfers into level 3, assets 55 [1] 41 [1] 238 [1] 195 [1]
Transfers out of level 3, assets (1) [1] (34) [1] (83) [1] (130) [1]
Ending balance, fair value assets 2,280 3,245 2,280 3,245
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets 14 (12) 59 347
Beginning balance, fair value liabilities 1,395 2,676 2,301 5,039
Realized gains/(losses), liabilities 24 28 418 1,548
Unrealized gains/(losses included in earnings, liabilities (40) (282) (801) (1,391)
Unrealized gains/(losses) included in OCI, liabilities 0 0 0 0
Foreign exchange recognized in OCI or earnings, liabilities (18) 6 (19) 4
Purchases, liabilities 0 0 0 0
Issuances, liabilities 0 0 3 0
Settlements, liabilities (84) (101) (584) (1,799)
Sales, liabilities 0 0 (41) [2] (1,076) [2]
Transfers into Level 3, liabilities 0 [1] 0 [1] 0 [1] 4 [1]
Transfers out of Level 3, liabilities 0 [1] 0 [1] 0 [1] (2) [1]
Ending balance, fair value liabilities 1,277 2,327 1,277 2,327
Change in unrealized gains/(losses) for the period included in earnings for liabilities still held, liabilities (24) (290) 60 366
Loans Receivable [Member] | Variable Interest Entity Primary Beneficiary [Member]
        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value assets 1,539 1,790 1,612 1,881
Unrealized gains/(losses) included in earnings, assets 12 (12) 48 208
Settlements, assets (56) (74) (165) (211)
Sales, assets       (174)
Ending balance, fair value assets 1,495 1,704 1,495 1,704
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets 12 (12) 48 194
Loan Repurchase Commitments [Member] | Variable Interest Entity Primary Beneficiary [Member]
        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value assets 363 1,115 359 1,086
Unrealized gains/(losses) included in earnings, assets 2 1 6 140
Settlements, assets       (110)
Ending balance, fair value assets 365 1,116 365 1,116
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets 2 1 6 140
State and municipal bonds [Member]
        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value assets 57 63 19 103
Realized gains/(losses), assets       2
Unrealized gains/(losses) included in OCI, assets     1 (1)
Settlements, assets (1) (1) (3) (4)
Sales, assets     (3) (12)
Transfers into level 3, assets 2   46 [1] 42 [1]
Transfers out of level 3, assets     (2) [1] (68) [1]
Ending balance, fair value assets 58 62 58 62
Foreign Government Debt [Member]
        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value assets 5 3 12 3
Settlements, assets (6) (3) (15) (11)
Transfers into level 3, assets 7 [1] 5 [1] 9 [1] 16 [1]
Transfers out of level 3, assets       (3) [1]
Ending balance, fair value assets 6 5 6 5
Corporate Obligations [Member]
        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value assets 34 63 48 76
Realized gains/(losses), assets   (7) 3 (5)
Unrealized gains/(losses) included in earnings, assets   1 3 6
Unrealized gains/(losses) included in OCI, assets   7 (4) 11
Foreign exchange recognized in OCI or earnings, assets (1) 2 (1)  
Purchases, assets 3   9 1
Settlements, assets (1) (14) (3) (14)
Sales, assets (1) (6) (23) (29)
Transfers into level 3, assets 4 [1] 1 [1] 7 [1] 1 [1]
Transfers out of level 3, assets     (1) [1]  
Ending balance, fair value assets 38 47 38 47
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets   1 2 6
Corporate Obligations [Member] | Variable Interest Entity Primary Beneficiary [Member]
        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value assets 62 48 48 78
Realized gains/(losses), assets   0   (4)
Unrealized gains/(losses) included in earnings, assets       (7)
Unrealized gains/(losses) included in OCI, assets       6
Settlements, assets     (4) (3)
Sales, assets       (25)
Transfers into level 3, assets 7   25 [1] 3 [1]
Ending balance, fair value assets 69 48 69 48
Residential Mortgage Backed Agency [Member]
        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value assets 8 3 0 0
Settlements, assets (8)   (8)  
Transfers into level 3, assets   17 [1] 37 [1] 20 [1]
Transfers out of level 3, assets   (3) [1] (29) [1] (3) [1]
Ending balance, fair value assets 0 17 0 17
Residential Mortgage Backed Non Agency [Member]
        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value assets   1 6 4
Unrealized gains/(losses) included in OCI, assets     (1)  
Settlements, assets       (3)
Transfers out of level 3, assets   (1) [1] (5) [1] (1) [1]
Ending balance, fair value assets 0 0 0 0
Residential Mortgage Backed Non Agency [Member] | Variable Interest Entity Primary Beneficiary [Member]
        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value assets 4 2 4 6
Realized gains/(losses), assets 0      
Unrealized gains/(losses) included in earnings, assets     (1) 6
Settlements, assets     (1) (7)
Transfers into level 3, assets   2 2 [1] 3 [1]
Transfers out of level 3, assets       (4) [1]
Ending balance, fair value assets 4 4 4 4
Commercial Mortgage Backed Securities [Member]
        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value assets 1 13 14 28
Realized gains/(losses), assets 0      
Unrealized gains/(losses) included in OCI, assets       4
Settlements, assets   (1) (14) (2)
Sales, assets       (18)
Transfers into level 3, assets   2 2 [1] 3 [1]
Transfers out of level 3, assets     (1) [1] (1) [1]
Ending balance, fair value assets 1 14 1 14
Commercial Mortgage Backed Securities [Member] | Variable Interest Entity Primary Beneficiary [Member]
        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value assets   4 3 7
Unrealized gains/(losses) included in earnings, assets   (1) (3) (1)
Settlements, assets   (1)    
Sales, assets       (24)
Transfers into level 3, assets       20 [1]
Ending balance, fair value assets   2   2
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets       1
Collateralized Debt Obligations [Member]
        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value assets 95 85 82 31
Realized gains/(losses), assets     (2) (2)
Unrealized gains/(losses) included in earnings, assets     1  
Unrealized gains/(losses) included in OCI, assets   7 27 11
Purchases, assets     5 61
Settlements, assets (3) (3) (9) (14)
Sales, assets     (41) (5)
Transfers into level 3, assets   10 [1] 36 [1] 28 [1]
Transfers out of level 3, assets   (11) [1] (7) [1] (22) [1]
Ending balance, fair value assets 92 88 92 88
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets       1
Collateralized Debt Obligations [Member] | Variable Interest Entity Primary Beneficiary [Member]
        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value assets 6 35 22 125
Realized gains/(losses), assets 0      
Unrealized gains/(losses) included in earnings, assets   1 (10) (8)
Unrealized gains/(losses) included in OCI, assets       5
Settlements, assets   (4) (4) (5)
Sales, assets       (84)
Transfers into level 3, assets     1 [1] 1 [1]
Transfers out of level 3, assets   (12) (3) [1] (14) [1]
Ending balance, fair value assets 6 20 6 20
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets   (1) 1 2
Other Asset Backed [Member]
        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value assets 82 64 58 26
Unrealized gains/(losses) included in OCI, assets (4) (5) 4 (5)
Purchases, assets     11 3
Settlements, assets (4) (4) (8) (9)
Sales, assets     (1)  
Transfers into level 3, assets 21 [1] 3 [1] 51 [1] 47 [1]
Transfers out of level 3, assets (1) [1] (1) [1] (21) [1] (5) [1]
Ending balance, fair value assets 94 57 94 57
Other Asset Backed [Member] | Variable Interest Entity Primary Beneficiary [Member]
        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value assets 26 63 54 64
Unrealized gains/(losses) included in earnings, assets   (7) (16) (7)
Settlements, assets (1) (1) (7) (10)
Sales, assets       (2)
Transfers into level 3, assets 14 1 [1] 18 [1] 11 [1]
Transfers out of level 3, assets   (6) (10) [1] (6)
Ending balance, fair value assets 39 50 39 50
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets   (1)   3
Medium Term Notes [Member]
        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value liabilities 217 188 203 165
Unrealized gains/(losses included in earnings, liabilities 2 9 17 34
Foreign exchange recognized in OCI or earnings, liabilities (17) 7 (18) 5
Ending balance, fair value liabilities 202 204 202 204
Change in unrealized gains/(losses) for the period included in earnings for liabilities still held, liabilities (15) 17 (1) 39
Credit Derivatives [Member]
        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value liabilities 332 1,648 1,147 2,921
Realized gains/(losses), liabilities 24 28 388 1,548
Unrealized gains/(losses included in earnings, liabilities (48) (285) (863) (1,562)
Settlements, liabilities (24) (28) (388) (1,548)
Transfers into Level 3, liabilities   0 [1]   4 [1]
Ending balance, fair value liabilities 284 1,363 284 1,363
Change in unrealized gains/(losses) for the period included in earnings for liabilities still held, liabilities (14) (285) 20 301
Interest Rate Derivatives [Member]
        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value liabilities   0   (1)
Unrealized gains/(losses included in earnings, liabilities   0   2
Foreign exchange recognized in OCI or earnings, liabilities   0    
Transfers out of Level 3, liabilities   0 [1]   (1) [1]
Ending balance, fair value liabilities   0   0
Change in unrealized gains/(losses) for the period included in earnings for liabilities still held, liabilities   (15)   (21)
Other Derivative Liabilities [Member]
        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value liabilities 33   0  
Realized gains/(losses), liabilities     30  
Unrealized gains/(losses included in earnings, liabilities 5   8  
Ending balance, fair value liabilities 38   38  
Change in unrealized gains/(losses) for the period included in earnings for liabilities still held, liabilities 5   8  
Variable Interest Entity Notes [Member] | Liabilities Of Consolidated Vies [Member]
        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value liabilities 802 824 940 1,932
Unrealized gains/(losses included in earnings, liabilities 4 (6) 40 140
Issuances, liabilities     3  
Settlements, liabilities (60) (73) (196) (251)
Sales, liabilities   0 (41) (1,076)
Ending balance, fair value liabilities 746 745 746 745
Change in unrealized gains/(losses) for the period included in earnings for liabilities still held, liabilities 4 (6) 37 53
Currency Derivatives [Member]
        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value liabilities   0   1
Unrealized gains/(losses included in earnings, liabilities   0    
Foreign exchange recognized in OCI or earnings, liabilities   0    
Transfers out of Level 3, liabilities   0 [1]   (1) [1]
Ending balance, fair value liabilities   0   0
Currency Derivatives [Member] | Liabilities Of Consolidated Vies [Member]
        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value liabilities 11 16 11 21
Unrealized gains/(losses included in earnings, liabilities (3) 0 (3) (5)
Foreign exchange recognized in OCI or earnings, liabilities (1) (1) (1) (1)
Ending balance, fair value liabilities 7 15 7 15
Change in unrealized gains/(losses) for the period included in earnings for liabilities still held, liabilities (4) (1) (4) (6)
Perpetual Debt And Equity Securities [Member]
        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value assets 13 10 11 14
Realized gains/(losses), assets 0      
Unrealized gains/(losses) included in earnings, assets     2  
Foreign exchange recognized in OCI or earnings, assets   1    
Transfers into level 3, assets     4 [1]  
Transfers out of level 3, assets     (4) [1] (3) [1]
Ending balance, fair value assets 13 11 13 11
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets     $ 2  
[1]
(1) - Transferred in and out at the end of the period.
[2]
Primarily relates to the deconsolidation of VIEs.