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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
Mar. 31, 2014
Mar. 31, 2013
Accounts Notes And Loans Receivable [Line Items]    
Beginning balance, fair value assets $ 2,352 $ 3,532
Realized gains/(losses), assets (1) 3
Unrealized gains/(losses) included in earnings, assets (10) 85
Unrealized gains/(losses) included in OCI, assets 6 9
Foreign exchange recognized in OCI or earnings, assets 0 (3)
Purchases, assets 5 0
Issuances, assets 0 0
Settlements, assets (73) (90)
Sales, assets (19) (55)
Transfers into level 3, assets 160 [1] 85 [1]
Transfers out of level 3, assets (14) [1] (78) [1]
Ending balance, fair value assets 2,406 3,488
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets 4 91
Beginning balance, fair value liabilities 2,301 5,039
Realized gains/(losses), liabilities 369 1
Unrealized gains/(losses included in earnings, liabilities (813) 217
Unrealized gains/(losses) included in OCI, liabilities 0 0
Foreign exchange recognized in OCI or earnings, liabilities 0 (4)
Purchases, liabilities 0 0
Issuances, liabilities 0 0
Settlements, liabilities (444) (154)
Sales, liabilities (41) [2] 0 [2]
Transfers into Level 3, liabilities 0 [1] 0 [1]
Transfers out of Level 3, liabilities 0 [1] 0 [1]
Ending balance, fair value liabilities 1,372 5,099
Change in unrealized gains/(losses) for the period included in earnings for liabilities still held, liabilities (7) 271
Loans Receivable [Member] | Variable Interest Entity Primary Beneficiary [Member]
    
Accounts Notes And Loans Receivable [Line Items]    
Beginning balance, fair value assets 1,612 1,881
Realized gains/(losses), assets 0 0
Unrealized gains/(losses) included in earnings, assets (1) 8
Unrealized gains/(losses) included in OCI, assets 0 0
Foreign exchange recognized in OCI or earnings, assets 0 0
Purchases, assets 0 0
Issuances, assets 0 0
Settlements, assets (54) (70)
Sales, assets 0 0
Transfers into level 3, assets 0 [1] 0 [1]
Transfers out of level 3, assets 0 [1] 0 [1]
Ending balance, fair value assets 1,557 1,819
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets (1) 8
Loan Repurchase Commitments [Member] | Variable Interest Entity Primary Beneficiary [Member]
    
Accounts Notes And Loans Receivable [Line Items]    
Beginning balance, fair value assets 359 1,086
Realized gains/(losses), assets 0 0
Unrealized gains/(losses) included in earnings, assets 5 90
Unrealized gains/(losses) included in OCI, assets 0 0
Foreign exchange recognized in OCI or earnings, assets 0 0
Purchases, assets 0 0
Issuances, assets 0 0
Settlements, assets 0 0
Sales, assets 0 0
Transfers into level 3, assets 0 [1] 0 [1]
Transfers out of level 3, assets 0 [1] 0 [1]
Ending balance, fair value assets 364 1,176
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets 5 90
State and municipal bonds [Member]
    
Accounts Notes And Loans Receivable [Line Items]    
Beginning balance, fair value assets 19 103
Realized gains/(losses), assets 0 2
Unrealized gains/(losses) included in earnings, assets 0 0
Unrealized gains/(losses) included in OCI, assets 0 0
Foreign exchange recognized in OCI or earnings, assets 0 0
Purchases, assets 0 0
Issuances, assets 0 0
Settlements, assets (1) (1)
Sales, assets 0 (13)
Transfers into level 3, assets 44 [1] 0 [1]
Transfers out of level 3, assets 0 [1] (68) [1]
Ending balance, fair value assets 62 23
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets 0 0
Foreign Government Debt [Member]
    
Accounts Notes And Loans Receivable [Line Items]    
Beginning balance, fair value assets 12 3
Realized gains/(losses), assets 0 0
Unrealized gains/(losses) included in earnings, assets 0 0
Unrealized gains/(losses) included in OCI, assets 0 0
Foreign exchange recognized in OCI or earnings, assets 0 0
Purchases, assets 0 0
Issuances, assets 0 0
Settlements, assets (5) 0
Sales, assets 0 0
Transfers into level 3, assets 0 [1] 8 [1]
Transfers out of level 3, assets 0 [1] (3) [1]
Ending balance, fair value assets 7 8
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets 0 0
Corporate Obligations [Member]
    
Accounts Notes And Loans Receivable [Line Items]    
Beginning balance, fair value assets 48 76
Realized gains/(losses), assets (1) 2
Unrealized gains/(losses) included in earnings, assets 1 4
Unrealized gains/(losses) included in OCI, assets (1) 1
Foreign exchange recognized in OCI or earnings, assets 0 (2)
Purchases, assets 0 0
Issuances, assets 0 0
Settlements, assets (1) (1)
Sales, assets (19) (23)
Transfers into level 3, assets 3 [1] 0 [1]
Transfers out of level 3, assets 0 [1] 0 [1]
Ending balance, fair value assets 30 57
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets 0 4
Corporate Obligations [Member] | Variable Interest Entity Primary Beneficiary [Member]
    
Accounts Notes And Loans Receivable [Line Items]    
Beginning balance, fair value assets 48 78
Realized gains/(losses), assets 0 0
Unrealized gains/(losses) included in earnings, assets 0 (2)
Unrealized gains/(losses) included in OCI, assets 0 0
Foreign exchange recognized in OCI or earnings, assets 0 0
Purchases, assets 0 0
Issuances, assets 0 0
Settlements, assets (1) 0
Sales, assets 0 0
Transfers into level 3, assets 17 [1] 3 [1]
Transfers out of level 3, assets 0 [1] 0 [1]
Ending balance, fair value assets 64 79
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets 1 0
Residential Mortgage Backed Agency [Member]
    
Accounts Notes And Loans Receivable [Line Items]    
Beginning balance, fair value assets 0 0
Realized gains/(losses), assets 0 0
Unrealized gains/(losses) included in earnings, assets 0 0
Unrealized gains/(losses) included in OCI, assets 0 0
Foreign exchange recognized in OCI or earnings, assets 0 0
Purchases, assets 0 0
Issuances, assets 0 0
Settlements, assets 0 0
Sales, assets 0 0
Transfers into level 3, assets 29 [1] 0 [1]
Transfers out of level 3, assets 0 [1] 0 [1]
Ending balance, fair value assets 29 0
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets 0 0
Residential Mortgage Backed Non Agency [Member]
    
Accounts Notes And Loans Receivable [Line Items]    
Beginning balance, fair value assets 6 4
Realized gains/(losses), assets 0 0
Unrealized gains/(losses) included in earnings, assets 0 0
Unrealized gains/(losses) included in OCI, assets (1) 0
Foreign exchange recognized in OCI or earnings, assets 0 0
Purchases, assets 0 0
Issuances, assets 0 0
Settlements, assets 0 (3)
Sales, assets 0 0
Transfers into level 3, assets 0 [1] 0 [1]
Transfers out of level 3, assets (5) [1] 0 [1]
Ending balance, fair value assets 0 1
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets 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 6
Realized gains/(losses), assets 0 0
Unrealized gains/(losses) included in earnings, assets 0 6
Unrealized gains/(losses) included in OCI, assets 0 0
Foreign exchange recognized in OCI or earnings, assets 0 0
Purchases, assets 0 0
Issuances, assets 0 0
Settlements, assets 0 (6)
Sales, assets 0 0
Transfers into level 3, assets 1 [1] 1 [1]
Transfers out of level 3, assets 0 [1] (1) [1]
Ending balance, fair value assets 5 6
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets 0 1
Commercial Mortgage Backed Securities [Member]
    
Accounts Notes And Loans Receivable [Line Items]    
Beginning balance, fair value assets 14 28
Realized gains/(losses), assets 0 0
Unrealized gains/(losses) included in earnings, assets 0 0
Unrealized gains/(losses) included in OCI, assets 0 4
Foreign exchange recognized in OCI or earnings, assets 0 0
Purchases, assets 0 0
Issuances, assets 0 0
Settlements, assets (1) 0
Sales, assets 0 (19)
Transfers into level 3, assets 1 [1] 1 [1]
Transfers out of level 3, assets 0 [1] (1) [1]
Ending balance, fair value assets 14 13
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets 0 0
Commercial Mortgage Backed Securities [Member] | Variable Interest Entity Primary Beneficiary [Member]
    
Accounts Notes And Loans Receivable [Line Items]    
Beginning balance, fair value assets 3 7
Realized gains/(losses), assets 0 0
Unrealized gains/(losses) included in earnings, assets 0 1
Unrealized gains/(losses) included in OCI, assets 0 0
Foreign exchange recognized in OCI or earnings, assets 0 0
Purchases, assets 0 0
Issuances, assets 0 0
Settlements, assets 0 0
Sales, assets 0 0
Transfers into level 3, assets 0 [1] 20 [1]
Transfers out of level 3, assets 0 [1] 0 [1]
Ending balance, fair value assets 3 28
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets 0 1
Collateralized Debt Obligations [Member]
    
Accounts Notes And Loans Receivable [Line Items]    
Beginning balance, fair value assets 82 31
Realized gains/(losses), assets 0 (1)
Unrealized gains/(losses) included in earnings, assets 0 0
Unrealized gains/(losses) included in OCI, assets 3 3
Foreign exchange recognized in OCI or earnings, assets 0 0
Purchases, assets 5 0
Issuances, assets 0 0
Settlements, assets (2) (4)
Sales, assets 0 0
Transfers into level 3, assets 33 [1] 9 [1]
Transfers out of level 3, assets (6) [1] (1) [1]
Ending balance, fair value assets 115 37
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets 0 0
Collateralized Debt Obligations [Member] | Variable Interest Entity Primary Beneficiary [Member]
    
Accounts Notes And Loans Receivable [Line Items]    
Beginning balance, fair value assets 22 125
Realized gains/(losses), assets 0 0
Unrealized gains/(losses) included in earnings, assets (3) (8)
Unrealized gains/(losses) included in OCI, assets 0 0
Foreign exchange recognized in OCI or earnings, assets 0 0
Purchases, assets 0 0
Issuances, assets 0 0
Settlements, assets (2) 0
Sales, assets 0 0
Transfers into level 3, assets 0 [1] 1 [1]
Transfers out of level 3, assets (3) [1] (1) [1]
Ending balance, fair value assets 14 117
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets (1) (4)
Other Asset Backed [Member]
    
Accounts Notes And Loans Receivable [Line Items]    
Beginning balance, fair value assets 58 26
Realized gains/(losses), assets 0 0
Unrealized gains/(losses) included in earnings, assets 0 0
Unrealized gains/(losses) included in OCI, assets 5 1
Foreign exchange recognized in OCI or earnings, assets 0 0
Purchases, assets 0 0
Issuances, assets 0 0
Settlements, assets (2) (2)
Sales, assets 0 0
Transfers into level 3, assets 24 [1] 42 [1]
Transfers out of level 3, assets 0 [1] 0 [1]
Ending balance, fair value assets 85 67
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets 0 0
Other Asset Backed [Member] | Variable Interest Entity Primary Beneficiary [Member]
    
Accounts Notes And Loans Receivable [Line Items]    
Beginning balance, fair value assets 54 64
Realized gains/(losses), assets 0 0
Unrealized gains/(losses) included in earnings, assets (12) (14)
Unrealized gains/(losses) included in OCI, assets 0 0
Foreign exchange recognized in OCI or earnings, assets 0 0
Purchases, assets 0 0
Issuances, assets 0 0
Settlements, assets (4) (3)
Sales, assets 0 0
Transfers into level 3, assets 4 [1] 0 [1]
Transfers out of level 3, assets 0 [1] 0 [1]
Ending balance, fair value assets 42 47
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets 0 (9)
Medium Term Notes [Member]
    
Accounts Notes And Loans Receivable [Line Items]    
Beginning balance, fair value liabilities 203 165
Realized gains/(losses), liabilities 0 0
Unrealized gains/(losses included in earnings, liabilities 12 21
Unrealized gains/(losses) included in OCI, liabilities 0 0
Foreign exchange recognized in OCI or earnings, liabilities 0 (5)
Purchases, liabilities 0 0
Issuances, liabilities 0 0
Settlements, liabilities 0 0
Sales, liabilities 0 0
Transfers into Level 3, liabilities 0 [1] 0 [1]
Transfers out of Level 3, liabilities 0 [1] 0 [1]
Ending balance, fair value liabilities 215 181
Change in unrealized gains/(losses) for the period included in earnings for liabilities still held, liabilities 12 16
Credit Derivatives [Member]
    
Accounts Notes And Loans Receivable [Line Items]    
Beginning balance, fair value liabilities 1,147 2,921
Realized gains/(losses), liabilities 339 1
Unrealized gains/(losses included in earnings, liabilities (838) 73
Unrealized gains/(losses) included in OCI, liabilities 0 0
Foreign exchange recognized in OCI or earnings, liabilities 0 0
Purchases, liabilities 0 0
Issuances, liabilities 0 0
Settlements, liabilities (339) (1)
Sales, liabilities 0 0
Transfers into Level 3, liabilities 0 [1] 0 [1]
Transfers out of Level 3, liabilities 0 [1] 0 [1]
Ending balance, fair value liabilities 309 2,994
Change in unrealized gains/(losses) for the period included in earnings for liabilities still held, liabilities (30) 131
Credit Derivatives [Member] | Liabilities Of Consolidated Vies [Member]
    
Accounts Notes And Loans Receivable [Line Items]    
Beginning balance, fair value liabilities 0 0
Realized gains/(losses), liabilities 0 0
Unrealized gains/(losses included in earnings, liabilities 0 0
Unrealized gains/(losses) included in OCI, liabilities 0 0
Foreign exchange recognized in OCI or earnings, liabilities 0 0
Purchases, liabilities 0 0
Issuances, liabilities 0 0
Settlements, liabilities 0 0
Sales, liabilities 0 0
Transfers into Level 3, liabilities 0 [1] 0 [1]
Transfers out of Level 3, liabilities 0 [1] 0 [1]
Ending balance, fair value liabilities 0 0
Change in unrealized gains/(losses) for the period included in earnings for liabilities still held, liabilities 0 0
Interest Rate Derivatives [Member]
    
Accounts Notes And Loans Receivable [Line Items]    
Beginning balance, fair value liabilities 0 (1)
Realized gains/(losses), liabilities 0 0
Unrealized gains/(losses included in earnings, liabilities 0 1
Unrealized gains/(losses) included in OCI, liabilities 0 0
Foreign exchange recognized in OCI or earnings, liabilities 0 (1)
Purchases, liabilities 0 0
Issuances, liabilities 0 0
Settlements, liabilities 0 0
Sales, liabilities 0 0
Transfers into Level 3, liabilities 0 [1] 0 [1]
Transfers out of Level 3, liabilities 0 [1] 0 [1]
Ending balance, fair value liabilities 0 (1)
Change in unrealized gains/(losses) for the period included in earnings for liabilities still held, liabilities 0 0
Other Derivative Liabilities [Member]
    
Accounts Notes And Loans Receivable [Line Items]    
Beginning balance, fair value liabilities 0  
Realized gains/(losses), liabilities 30  
Unrealized gains/(losses included in earnings, liabilities 1  
Unrealized gains/(losses) included in OCI, liabilities 0  
Foreign exchange recognized in OCI or earnings, liabilities 0  
Purchases, liabilities 0  
Issuances, liabilities 0  
Settlements, liabilities 0  
Sales, liabilities 0  
Transfers into Level 3, liabilities 0 [1]  
Transfers out of Level 3, liabilities 0 [1]  
Ending balance, fair value liabilities 31  
Change in unrealized gains/(losses) for the period included in earnings for liabilities still held, liabilities 1  
Variable Interest Entity Notes [Member] | Liabilities Of Consolidated Vies [Member]
    
Accounts Notes And Loans Receivable [Line Items]    
Beginning balance, fair value liabilities 940 1,932
Realized gains/(losses), liabilities 0 0
Unrealized gains/(losses included in earnings, liabilities 18 122
Unrealized gains/(losses) included in OCI, liabilities 0 0
Foreign exchange recognized in OCI or earnings, liabilities 0 0
Purchases, liabilities 0 0
Issuances, liabilities 0 0
Settlements, liabilities (105) (153)
Sales, liabilities (41) 0
Transfers into Level 3, liabilities 0 [1] 0 [1]
Transfers out of Level 3, liabilities 0 [1] 0 [1]
Ending balance, fair value liabilities 812 1,901
Change in unrealized gains/(losses) for the period included in earnings for liabilities still held, liabilities 16 122
Currency Derivatives [Member]
    
Accounts Notes And Loans Receivable [Line Items]    
Beginning balance, fair value liabilities 0 1
Realized gains/(losses), liabilities 0 0
Unrealized gains/(losses included in earnings, liabilities 0 1
Unrealized gains/(losses) included in OCI, liabilities 0 0
Foreign exchange recognized in OCI or earnings, liabilities 0 (1)
Purchases, liabilities 0 0
Issuances, liabilities 0 0
Settlements, liabilities 0 0
Sales, liabilities 0 0
Transfers into Level 3, liabilities 0 [1] 0 [1]
Transfers out of Level 3, liabilities 0 [1] 0 [1]
Ending balance, fair value liabilities 0 1
Change in unrealized gains/(losses) for the period included in earnings for liabilities still held, liabilities 0 0
Currency Derivatives [Member] | Liabilities Of Consolidated Vies [Member]
    
Accounts Notes And Loans Receivable [Line Items]    
Beginning balance, fair value liabilities 11 21
Realized gains/(losses), liabilities 0 0
Unrealized gains/(losses included in earnings, liabilities (6) (1)
Unrealized gains/(losses) included in OCI, liabilities 0 0
Foreign exchange recognized in OCI or earnings, liabilities 0 3
Purchases, liabilities 0 0
Issuances, liabilities 0 0
Settlements, liabilities 0 0
Sales, liabilities 0 0
Transfers into Level 3, liabilities 0 [1] 0 [1]
Transfers out of Level 3, liabilities 0 [1] 0 [1]
Ending balance, fair value liabilities 5 23
Change in unrealized gains/(losses) for the period included in earnings for liabilities still held, liabilities (6) 2
Perpetual Debt And Equity Securities [Member]
    
Accounts Notes And Loans Receivable [Line Items]    
Beginning balance, fair value assets 11 14
Realized gains/(losses), assets 0 0
Unrealized gains/(losses) included in earnings, assets 0 0
Unrealized gains/(losses) included in OCI, assets 0 0
Foreign exchange recognized in OCI or earnings, assets 0 (1)
Purchases, assets 0 0
Issuances, assets 0 0
Settlements, assets 0 0
Sales, assets 0 0
Transfers into level 3, assets 4 [1] 0 [1]
Transfers out of level 3, assets 0 [1] (3) [1]
Ending balance, fair value assets 15 10
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets $ 0 $ 0
[1] (1) - Transferred in and out at the end of the period.
[2] Primarily relates to the deconsolidation of VIEs.