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Fair Value Of Financial Instruments (Changes In Level 3 Assets And Liabilities Measured At Fair Value On Recurring Basis) (Detail) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Variable Interest Entity [Member] | Loans Receivable [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Ending Balance, Fair Value Assets $ 1,881  
Variable Interest Entity [Member] | Loan Repurchase Commitments [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Ending Balance, Fair Value Assets 1,086  
Significant Unobservable Inputs (Level 3) [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Beginning Balance, Fair Value Assets 4,188 4,467
Realized Gains / (Losses), Assets (71) (73)
Unrealized Gains / (Losses) Included in Earnings, Assets 106 316
Unrealized Gains / (Losses) Included in OCI, Assets 123 56
Foreign Exchange Recognized in OCI or Earnings, Assets 1 5
Purchases, Assets 74 167
Issuances, Assets   15
Settlements, Assets (438) (632)
Sales, Assets (582) (189)
Transfers into Level 3, Assets 288 [1] 447 [1]
Transfers out of Level 3, Assets (157) [1] (391) [1]
Ending Balance, Fair Value Assets 3,532 4,188
Change in Unrealized Gains (Losses) for the Period Included in Earnings for Assets still held, Assets 151 364
Beginning Balance, Fair Value Liabilities 7,938 9,916
Realized Gains / (Losses), Liabilities 464 2,477
Unrealized Gains / (Losses) Included in Earnings, Liabilities (1,403) 605
Unrealized Gains / (Losses) Included in OCI, Liabilities      
Foreign Exchange Recognized in OCI or Earnings, Liabilities 3 (4)
Purchases, Liabilities   (8)
Issuances, Liabilities      
Settlements, Liabilities (903) (3,056)
Sales, Liabilities (1,065) (2,001)
Transfers into Level 3, Liabilities 5 [1] 9 [1]
Transfers out of Level 3, Liabilities    [1]    [1]
Ending Balance, Fair Value Liabilities 5,039 7,938
Change in Unrealized Gains (Losses) for the Period Included in Earnings for Liabilities still held, Liabilities (499) 2,809
Significant Unobservable Inputs (Level 3) [Member] | Variable Interest Entity [Member] | Loans Receivable [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Beginning Balance, Fair Value Assets 2,046 2,183
Unrealized Gains / (Losses) Included in Earnings, Assets 114 132
Purchases, Assets   24
Settlements, Assets (277) (291)
Sales, Assets (2) (2)
Ending Balance, Fair Value Assets 1,881 2,046
Change in Unrealized Gains (Losses) for the Period Included in Earnings for Assets still held, Assets 114 132
Significant Unobservable Inputs (Level 3) [Member] | Variable Interest Entity [Member] | Loan Repurchase Commitments [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Beginning Balance, Fair Value Assets 1,077 835
Unrealized Gains / (Losses) Included in Earnings, Assets 9 230
Issuances, Assets   12
Ending Balance, Fair Value Assets 1,086 1,077
Change in Unrealized Gains (Losses) for the Period Included in Earnings for Assets still held, Assets 9 230
Significant Unobservable Inputs (Level 3) [Member] | Foreign Governments [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Beginning Balance, Fair Value Assets 11 11
Foreign Exchange Recognized in OCI or Earnings, Assets 1 (7)
Purchases, Assets 21 13
Settlements, Assets (29) (5)
Sales, Assets (4) (1)
Transfers into Level 3, Assets 3 [1] 7 [1]
Transfers out of Level 3, Assets   (7) [1]
Ending Balance, Fair Value Assets 3 11
Significant Unobservable Inputs (Level 3) [Member] | Corporate Obligations [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Beginning Balance, Fair Value Assets 207 246
Realized Gains / (Losses), Assets (15) (4)
Unrealized Gains / (Losses) Included in Earnings, Assets 10  
Unrealized Gains / (Losses) Included in OCI, Assets 27 (8)
Foreign Exchange Recognized in OCI or Earnings, Assets   7
Purchases, Assets 17 20
Settlements, Assets (29) (127)
Sales, Assets (141) (61)
Transfers into Level 3, Assets 25 [1] 166 [1]
Transfers out of Level 3, Assets (25) [1] (32) [1]
Ending Balance, Fair Value Assets 76 207
Change in Unrealized Gains (Losses) for the Period Included in Earnings for Assets still held, Assets 9  
Significant Unobservable Inputs (Level 3) [Member] | Corporate Obligations [Member] | Variable Interest Entity [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Beginning Balance, Fair Value Assets 69 82
Unrealized Gains / (Losses) Included in Earnings, Assets (19) (17)
Unrealized Gains / (Losses) Included in OCI, Assets (6)  
Purchases, Assets 27  
Settlements, Assets (5) (6)
Transfers into Level 3, Assets 15 [1] 17 [1]
Transfers out of Level 3, Assets (3) [1] (7) [1]
Ending Balance, Fair Value Assets 78 69
Change in Unrealized Gains (Losses) for the Period Included in Earnings for Assets still held, Assets 3 (2)
Significant Unobservable Inputs (Level 3) [Member] | Residential Mortgage-Backed Agency [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Beginning Balance, Fair Value Assets   41
Unrealized Gains / (Losses) Included in OCI, Assets   1
Purchases, Assets   2
Settlements, Assets   (1)
Sales, Assets   (2)
Transfers into Level 3, Assets 4 [1]  
Transfers out of Level 3, Assets (4) [1] (41) [1]
Significant Unobservable Inputs (Level 3) [Member] | Residential Mortgage-Backed Non-Agency [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Beginning Balance, Fair Value Assets 17 48
Realized Gains / (Losses), Assets (1) (2)
Unrealized Gains / (Losses) Included in OCI, Assets   10
Foreign Exchange Recognized in OCI or Earnings, Assets   2
Purchases, Assets   12
Settlements, Assets (13) (22)
Sales, Assets (5) (18)
Transfers into Level 3, Assets 31 [1] 10 [1]
Transfers out of Level 3, Assets (25) [1] (23) [1]
Ending Balance, Fair Value Assets 4 17
Significant Unobservable Inputs (Level 3) [Member] | Residential Mortgage-Backed Non-Agency [Member] | Variable Interest Entity [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Beginning Balance, Fair Value Assets 21 40
Unrealized Gains / (Losses) Included in Earnings, Assets 6 (3)
Unrealized Gains / (Losses) Included in OCI, Assets   3
Settlements, Assets (7) (6)
Sales, Assets (16) (6)
Transfers into Level 3, Assets 6 [1] 13 [1]
Transfers out of Level 3, Assets (4) [1] (20) [1]
Ending Balance, Fair Value Assets 6 21
Change in Unrealized Gains (Losses) for the Period Included in Earnings for Assets still held, Assets 3  
Significant Unobservable Inputs (Level 3) [Member] | Commercial Mortgage-Backed [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Beginning Balance, Fair Value Assets 32 41
Realized Gains / (Losses), Assets   (2)
Unrealized Gains / (Losses) Included in OCI, Assets 6  
Foreign Exchange Recognized in OCI or Earnings, Assets   1
Purchases, Assets 1 9
Settlements, Assets   (3)
Sales, Assets   (21)
Transfers into Level 3, Assets 1 [1] 8 [1]
Transfers out of Level 3, Assets (12) [1] (1) [1]
Ending Balance, Fair Value Assets 28 32
Significant Unobservable Inputs (Level 3) [Member] | Commercial Mortgage-Backed [Member] | Variable Interest Entity [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Beginning Balance, Fair Value Assets 22 23
Unrealized Gains / (Losses) Included in Earnings, Assets 4 9
Settlements, Assets (4) (2)
Sales, Assets (9) (13)
Transfers into Level 3, Assets 5 [1] 7 [1]
Transfers out of Level 3, Assets (11) [1] (2) [1]
Ending Balance, Fair Value Assets 7 22
Change in Unrealized Gains (Losses) for the Period Included in Earnings for Assets still held, Assets 1 3
Significant Unobservable Inputs (Level 3) [Member] | Collateralized Debt Obligations [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Beginning Balance, Fair Value Assets 60 192
Realized Gains / (Losses), Assets (9) (4)
Unrealized Gains / (Losses) Included in OCI, Assets 20 25
Foreign Exchange Recognized in OCI or Earnings, Assets   2
Purchases, Assets 1 6
Issuances, Assets   3
Settlements, Assets (15) (114)
Sales, Assets (10) (4)
Transfers into Level 3, Assets 18 [1] 50 [1]
Transfers out of Level 3, Assets (34) [1] (96) [1]
Ending Balance, Fair Value Assets 31 60
Significant Unobservable Inputs (Level 3) [Member] | Collateralized Debt Obligations [Member] | Variable Interest Entity [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Beginning Balance, Fair Value Assets 203 245
Unrealized Gains / (Losses) Included in Earnings, Assets (25) (25)
Unrealized Gains / (Losses) Included in OCI, Assets 2 (7)
Purchases, Assets   60
Settlements, Assets (12) (7)
Sales, Assets (74) (39)
Transfers into Level 3, Assets 56 [1] 71 [1]
Transfers out of Level 3, Assets (25) [1] (95) [1]
Ending Balance, Fair Value Assets 125 203
Change in Unrealized Gains (Losses) for the Period Included in Earnings for Assets still held, Assets 5 5
Significant Unobservable Inputs (Level 3) [Member] | Other Asset-Backed [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Beginning Balance, Fair Value Assets 317 349
Realized Gains / (Losses), Assets (46) (62)
Unrealized Gains / (Losses) Included in OCI, Assets 73 32
Purchases, Assets 3 9
Settlements, Assets (29) (22)
Sales, Assets (285) (2)
Transfers into Level 3, Assets 4 [1] 78 [1]
Transfers out of Level 3, Assets (11) [1] (65) [1]
Ending Balance, Fair Value Assets 26 317
Significant Unobservable Inputs (Level 3) [Member] | Other Asset-Backed [Member] | Variable Interest Entity [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Beginning Balance, Fair Value Assets 67 81
Unrealized Gains / (Losses) Included in Earnings, Assets 6 (10)
Purchases, Assets 4  
Settlements, Assets (11) (2)
Sales, Assets (36) (19)
Transfers into Level 3, Assets 34 [1] 19 [1]
Transfers out of Level 3, Assets   (2) [1]
Ending Balance, Fair Value Assets 64 67
Change in Unrealized Gains (Losses) for the Period Included in Earnings for Assets still held, Assets 7 (4)
Significant Unobservable Inputs (Level 3) [Member] | State And Municipal Bonds [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Beginning Balance, Fair Value Assets 28 50
Realized Gains / (Losses), Assets   1
Unrealized Gains / (Losses) Included in OCI, Assets (1)  
Purchases, Assets   2
Settlements, Assets (7) (24)
Sales, Assets   (1)
Transfers into Level 3, Assets 83 [1]  
Ending Balance, Fair Value Assets 103 28
Significant Unobservable Inputs (Level 3) [Member] | Equity Securities [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Beginning Balance, Fair Value Assets 11  
Unrealized Gains / (Losses) Included in Earnings, Assets 1  
Unrealized Gains / (Losses) Included in OCI, Assets 2  
Purchases, Assets   10
Transfers into Level 3, Assets 3 [1] 1 [1]
Transfers out of Level 3, Assets (3) [1]  
Ending Balance, Fair Value Assets 14 11
Significant Unobservable Inputs (Level 3) [Member] | Medium-Term Notes [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Beginning Balance, Fair Value Liabilities 165 116
Unrealized Gains / (Losses) Included in Earnings, Liabilities (3) 78
Unrealized Gains / (Losses) Included in OCI, Liabilities      
Foreign Exchange Recognized in OCI or Earnings, Liabilities 3 (4)
Issuances, Liabilities      
Settlements, Liabilities   (25)
Transfers out of Level 3, Liabilities    [1]    [1]
Ending Balance, Fair Value Liabilities 165 165
Change in Unrealized Gains (Losses) for the Period Included in Earnings for Liabilities still held, Liabilities (3) 78
Significant Unobservable Inputs (Level 3) [Member] | Credit Derivatives [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Beginning Balance, Fair Value Liabilities 4,790 4,350
Realized Gains / (Losses), Liabilities 464 2,477
Unrealized Gains / (Losses) Included in Earnings, Liabilities (1,869) 440
Unrealized Gains / (Losses) Included in OCI, Liabilities      
Purchases, Liabilities   (8)
Issuances, Liabilities      
Settlements, Liabilities (464) (2,477)
Transfers into Level 3, Liabilities   8 [1]
Transfers out of Level 3, Liabilities    [1]    [1]
Ending Balance, Fair Value Liabilities 2,921 4,790
Change in Unrealized Gains (Losses) for the Period Included in Earnings for Liabilities still held, Liabilities (927) 2,702
Significant Unobservable Inputs (Level 3) [Member] | Credit Derivatives [Member] | Liabilities Of Consolidated VIEs [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Beginning Balance, Fair Value Liabilities 80 768
Unrealized Gains / (Losses) Included in Earnings, Liabilities 2 (11)
Unrealized Gains / (Losses) Included in OCI, Liabilities      
Issuances, Liabilities      
Sales, Liabilities (82) (677)
Transfers out of Level 3, Liabilities    [1]    [1]
Ending Balance, Fair Value Liabilities   80
Change in Unrealized Gains (Losses) for the Period Included in Earnings for Liabilities still held, Liabilities   (80)
Significant Unobservable Inputs (Level 3) [Member] | Interest Rate Derivatives [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Beginning Balance, Fair Value Liabilities (3) (5)
Unrealized Gains / (Losses) Included in Earnings, Liabilities (2) 1
Unrealized Gains / (Losses) Included in OCI, Liabilities      
Issuances, Liabilities      
Transfers into Level 3, Liabilities 4 [1] 1 [1]
Transfers out of Level 3, Liabilities    [1]    [1]
Ending Balance, Fair Value Liabilities (1) (3)
Change in Unrealized Gains (Losses) for the Period Included in Earnings for Liabilities still held, Liabilities 18 12
Significant Unobservable Inputs (Level 3) [Member] | Currency Derivatives [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unrealized Gains / (Losses) Included in OCI, Liabilities     
Issuances, Liabilities     
Transfers into Level 3, Liabilities 1 [1]  
Transfers out of Level 3, Liabilities    [1]  
Ending Balance, Fair Value Liabilities 1  
Significant Unobservable Inputs (Level 3) [Member] | Currency Derivatives [Member] | Liabilities Of Consolidated VIEs [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Beginning Balance, Fair Value Liabilities 17 14
Unrealized Gains / (Losses) Included in Earnings, Liabilities 4 3
Unrealized Gains / (Losses) Included in OCI, Liabilities      
Issuances, Liabilities      
Transfers out of Level 3, Liabilities    [1]    [1]
Ending Balance, Fair Value Liabilities 21 17
Change in Unrealized Gains (Losses) for the Period Included in Earnings for Liabilities still held, Liabilities 4 3
Significant Unobservable Inputs (Level 3) [Member] | Variable Interest Entity Notes [Member] | Liabilities Of Consolidated VIEs [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Beginning Balance, Fair Value Liabilities 2,889 4,673
Unrealized Gains / (Losses) Included in Earnings, Liabilities 465 94
Unrealized Gains / (Losses) Included in OCI, Liabilities      
Issuances, Liabilities      
Settlements, Liabilities (439) (554)
Sales, Liabilities (983) (1,324)
Transfers out of Level 3, Liabilities    [1]    [1]
Ending Balance, Fair Value Liabilities 1,932 2,889
Change in Unrealized Gains (Losses) for the Period Included in Earnings for Liabilities still held, Liabilities $ 409 $ 94
[1] Transferred in and out at the end of the period.