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Fair Value Of Financial Instruments (Changes In Level 3 Assets And Liabilities Measured At Fair Value On A Recurring Basis) (Details) (USD $)
In Millions
3 Months Ended 6 Months Ended
Jun. 30, 2011
Jun. 30, 2010
Jun. 30, 2011
Jun. 30, 2010
Beginning Balance, Fair Value Assets $ 4,439 $ 5,074 $ 4,467 $ 1,627
Realized Gains / (Losses), Assets (2) (6) (3) (17)
Unrealized Gains / (Losses) Included in Earnings, Assets 59 314 323 294
Unrealized Gains / (Losses) Included in OCI, Assets 7 35 51 116
Foreign Exchange Recognized in OCI or Earnings, Assets (17) (45) (14) (28)
Purchases, Assets 25   57  
Issuances, Assets     13  
Settlements, Assets (93)   (266)  
Sales, Assets (31)   (48)  
Purchases, Issuances and Settlements, net, Assets   (106)   3,265
Transfers into Level 3, Assets 172 [1] 336 [1] 215 397
Transfers out of Level 3, Assets (31) [1] (332) [1] (267) (384)
Ending Balance, Fair Value Assets 4,528 5,270 4,528 5,270
Change in Unrealized Gains (Losses) for the Period Included in Earnings for Assets Still Held, Assets 113 77 378 77
Beginning Balance, Fair Value Liabilities 11,822 11,740 9,916 3,900
Realized Gains / (Losses), Liabilities 193 90 547 145
Unrealized Gains / (Losses) Included in Earnings, Liabilities (77) (1,390) 2,123 828
Unrealized Gains / (Losses) Included in OCI, Liabilities        
Foreign Exchange Recognized in OCI or Earnings, Liabilities 4 (24) 12 (21)
Purchases, Liabilities        
Issuances, Liabilities        
Settlements, Liabilities (456)   (1,112)  
Sales, Liabilities (180)   (180)  
Purchases, Issuances and Settlements, net, Liabilities   (493)   5,071
Transfers into Level 3, Liabilities 1 [1]   [1] 1  
Transfers out of Level 3, Liabilities     [1]    
Ending Balance, Fair Value Liabilities 11,307 9,923 11,307 9,923
Change in Unrealized Gains (Losses) for the Period Included in Earnings for Assets still held, Liabilities 937 (1,524) 2,944 690
Variable Interest Entity, Primary Beneficiary [Member] | Loans Receivable [Member]
       
Beginning Balance, Fair Value Assets 2,327 2,434    
Unrealized Gains / (Losses) Included in Earnings, Assets 68 214   195
Unrealized Gains / (Losses) Included in OCI, Assets        
Foreign Exchange Recognized in OCI or Earnings, Assets   (40)   (21)
Settlements, Assets (73)      
Sales, Assets (2)      
Purchases, Issuances and Settlements, net, Assets       2,434
Transfers into Level 3, Assets     [1]    
Transfers out of Level 3, Assets     [1]    
Ending Balance, Fair Value Assets 2,320 2,608 2,320 2,608
Change in Unrealized Gains (Losses) for the Period Included in Earnings for Assets Still Held, Assets 68      
Variable Interest Entity, Primary Beneficiary [Member] | Loans Receivable [Member]
       
Beginning Balance, Fair Value Assets     2,183  
Unrealized Gains / (Losses) Included in Earnings, Assets     296  
Unrealized Gains / (Losses) Included in OCI, Assets        
Purchases, Assets        
Issuances, Assets        
Settlements, Assets     (157)  
Sales, Assets     (2)  
Transfers out of Level 3, Assets        
Ending Balance, Fair Value Assets 2,320   2,320  
Change in Unrealized Gains (Losses) for the Period Included in Earnings for Assets Still Held, Assets     296  
Variable Interest Entity, Primary Beneficiary [Member] | Loan Repurchase Commitments [Member]
       
Beginning Balance, Fair Value Assets 867 715    
Unrealized Gains / (Losses) Included in Earnings, Assets 38 77   77
Unrealized Gains / (Losses) Included in OCI, Assets        
Purchases, Issuances and Settlements, net, Assets       715
Transfers into Level 3, Assets     [1]    
Transfers out of Level 3, Assets     [1]    
Ending Balance, Fair Value Assets 905 792 905 792
Change in Unrealized Gains (Losses) for the Period Included in Earnings for Assets Still Held, Assets 38 77   77
Variable Interest Entity, Primary Beneficiary [Member] | Loan Repurchase Commitments [Member]
       
Beginning Balance, Fair Value Assets     835  
Unrealized Gains / (Losses) Included in Earnings, Assets     58  
Unrealized Gains / (Losses) Included in OCI, Assets        
Purchases, Assets        
Issuances, Assets     12  
Transfers out of Level 3, Assets        
Ending Balance, Fair Value Assets 905   905  
Change in Unrealized Gains (Losses) for the Period Included in Earnings for Assets Still Held, Assets     58  
Other Fixed Maturity Investments [Member]
       
Beginning Balance, Fair Value Assets       19
Unrealized Gains / (Losses) Included in OCI, Assets        
Purchases, Issuances and Settlements, net, Assets       (19)
Transfers into Level 3, Assets        
Transfers out of Level 3, Assets        
U.S. Treasury and Government Agency [Member]
       
Beginning Balance, Fair Value Assets       6
Unrealized Gains / (Losses) Included in OCI, Assets        
Purchases, Issuances and Settlements, net, Assets       (6)
Transfers into Level 3, Assets        
Transfers out of Level 3, Assets        
Foreign Governments [Member]
       
Beginning Balance, Fair Value Assets 19 13 11 12
Unrealized Gains / (Losses) Included in Earnings, Assets        
Unrealized Gains / (Losses) Included in OCI, Assets        
Foreign Exchange Recognized in OCI or Earnings, Assets (6) (1) (6)  
Purchases, Assets 4   7  
Issuances, Assets        
Settlements, Assets 3   1  
Transfers into Level 3, Assets     [1] 7  
Transfers out of Level 3, Assets (7) [1]   [1] (7)  
Ending Balance, Fair Value Assets 13 12 13 12
Change in Unrealized Gains (Losses) for the Period Included in Earnings for Assets Still Held, Assets        
Variable Interest Entity, Primary Beneficiary [Member] | Corporate Obligations [Member]
       
Beginning Balance, Fair Value Assets 82 81 80  
Unrealized Gains / (Losses) Included in Earnings, Assets (17) 76 (17) 76
Unrealized Gains / (Losses) Included in OCI, Assets        
Purchases, Assets        
Issuances, Assets        
Settlements, Assets (2)   (4)  
Purchases, Issuances and Settlements, net, Assets   (20)   61
Transfers into Level 3, Assets 4 [1]   [1] 8  
Transfers out of Level 3, Assets (7) [1] (8) [1] (7) (8)
Ending Balance, Fair Value Assets 60 129 60 129
Change in Unrealized Gains (Losses) for the Period Included in Earnings for Assets Still Held, Assets     (1)  
Corporate Obligations [Member]
       
Beginning Balance, Fair Value Assets 211 320 246 281
Realized Gains / (Losses), Assets   (1)   (1)
Unrealized Gains / (Losses) Included in Earnings, Assets        
Unrealized Gains / (Losses) Included in OCI, Assets   9 7 32
Foreign Exchange Recognized in OCI or Earnings, Assets 1 (3) 3 (5)
Purchases, Assets 1   11  
Issuances, Assets        
Settlements, Assets (1)   (34)  
Sales, Assets     (12)  
Purchases, Issuances and Settlements, net, Assets   (13)   (15)
Transfers into Level 3, Assets 82 [1] 11 [1] 88 41
Transfers out of Level 3, Assets   (12) [1] (15) (22)
Ending Balance, Fair Value Assets 294 311 294 311
Change in Unrealized Gains (Losses) for the Period Included in Earnings for Assets Still Held, Assets        
Variable Interest Entity, Primary Beneficiary [Member] | Residential Mortgage-Backed Agency [Member]
       
Beginning Balance, Fair Value Assets   82    
Unrealized Gains / (Losses) Included in Earnings, Assets   (252)    
Unrealized Gains / (Losses) Included in OCI, Assets   2    
Purchases, Issuances and Settlements, net, Assets   (4)    
Transfers into Level 3, Assets   274 [1]    
Transfers out of Level 3, Assets   (49) [1]    
Ending Balance, Fair Value Assets   53   53
Change in Unrealized Gains (Losses) for the Period Included in Earnings for Assets Still Held, Assets        
Residential Mortgage-Backed Agency [Member]
       
Beginning Balance, Fair Value Assets   46 41 48
Unrealized Gains / (Losses) Included in Earnings, Assets        
Unrealized Gains / (Losses) Included in OCI, Assets   1 1 2
Purchases, Assets     1  
Issuances, Assets        
Settlements, Assets     (1)  
Sales, Assets     (1)  
Purchases, Issuances and Settlements, net, Assets   (2)   (5)
Transfers into Level 3, Assets     [1]    
Transfers out of Level 3, Assets   (45) [1] (41) (45)
Change in Unrealized Gains (Losses) for the Period Included in Earnings for Assets Still Held, Assets        
Variable Interest Entity, Primary Beneficiary [Member] | Residential Mortgage-Backed Non-Agency [Member]
       
Beginning Balance, Fair Value Assets 18   40 166
Realized Gains / (Losses), Assets       (1)
Unrealized Gains / (Losses) Included in Earnings, Assets 4   2 (253)
Unrealized Gains / (Losses) Included in OCI, Assets     3 3
Purchases, Assets        
Issuances, Assets        
Settlements, Assets (2)   (5)  
Purchases, Issuances and Settlements, net, Assets       (91)
Transfers into Level 3, Assets       281
Transfers out of Level 3, Assets (3) [1]   (23) (52)
Ending Balance, Fair Value Assets 17 53 17 53
Change in Unrealized Gains (Losses) for the Period Included in Earnings for Assets Still Held, Assets 1   2  
Residential Mortgage-Backed Non-Agency [Member]
       
Beginning Balance, Fair Value Assets 43 66 48 64
Realized Gains / (Losses), Assets (1)   (1) (3)
Unrealized Gains / (Losses) Included in Earnings, Assets        
Unrealized Gains / (Losses) Included in OCI, Assets 5 5 10 32
Foreign Exchange Recognized in OCI or Earnings, Assets (2)   (2)  
Purchases, Assets 4   11  
Issuances, Assets        
Settlements, Assets (6)   (11)  
Sales, Assets (18)   (19)  
Purchases, Issuances and Settlements, net, Assets   (4)   (21)
Transfers into Level 3, Assets 3 [1] 3 [1] 8 3
Transfers out of Level 3, Assets   (40) [1] (16) (45)
Ending Balance, Fair Value Assets 28 30 28 30
Change in Unrealized Gains (Losses) for the Period Included in Earnings for Assets Still Held, Assets        
Variable Interest Entity, Primary Beneficiary [Member] | Commercial Mortgage-Backed [Member]
       
Beginning Balance, Fair Value Assets 29 56 23 3
Unrealized Gains / (Losses) Included in Earnings, Assets 1 218 7 218
Unrealized Gains / (Losses) Included in OCI, Assets        
Purchases, Assets        
Issuances, Assets        
Settlements, Assets (2)   (2)  
Sales, Assets (1)   (1)  
Purchases, Issuances and Settlements, net, Assets       53
Transfers into Level 3, Assets   1 [1]   1
Transfers out of Level 3, Assets   (59) [1]   (59)
Ending Balance, Fair Value Assets 27 216 27 216
Change in Unrealized Gains (Losses) for the Period Included in Earnings for Assets Still Held, Assets (1)   6  
Commercial Mortgage-Backed [Member]
       
Beginning Balance, Fair Value Assets 51 17 41 20
Unrealized Gains / (Losses) Included in Earnings, Assets        
Unrealized Gains / (Losses) Included in OCI, Assets   1 2 1
Foreign Exchange Recognized in OCI or Earnings, Assets   (1) 1 (2)
Purchases, Assets 1   9  
Issuances, Assets        
Sales, Assets (2)   (2)  
Purchases, Issuances and Settlements, net, Assets   (3)   (5)
Transfers into Level 3, Assets     [1]    
Transfers out of Level 3, Assets     [1] (1)  
Ending Balance, Fair Value Assets 50 14 50 14
Change in Unrealized Gains (Losses) for the Period Included in Earnings for Assets Still Held, Assets        
Variable Interest Entity, Primary Beneficiary [Member] | Collateralized Debt Obligations [Member]
       
Beginning Balance, Fair Value Assets 219 326 245 42
Unrealized Gains / (Losses) Included in Earnings, Assets (28) (27) (14) (27)
Unrealized Gains / (Losses) Included in OCI, Assets        
Purchases, Assets        
Issuances, Assets        
Settlements, Assets     (2)  
Purchases, Issuances and Settlements, net, Assets       284
Transfers into Level 3, Assets 24 [1] 40 [1] 40 40
Transfers out of Level 3, Assets (14) [1] (12) [1] (68) (12)
Ending Balance, Fair Value Assets 201 327 201 327
Change in Unrealized Gains (Losses) for the Period Included in Earnings for Assets Still Held, Assets 5   19  
Collateralized Debt Obligations [Member]
       
Beginning Balance, Fair Value Assets 123 202 191 245
Realized Gains / (Losses), Assets (1) (5) (2) (12)
Unrealized Gains / (Losses) Included in Earnings, Assets        
Unrealized Gains / (Losses) Included in OCI, Assets 8 21 28 61
Foreign Exchange Recognized in OCI or Earnings, Assets (9)   (9)  
Purchases, Assets 5   7  
Issuances, Assets     1  
Settlements, Assets (4)   (33)  
Sales, Assets (6)   (8)  
Purchases, Issuances and Settlements, net, Assets   (9)   (76)
Transfers into Level 3, Assets 46 [1]   [1] 48 16
Transfers out of Level 3, Assets   (98) [1] (61) (123)
Ending Balance, Fair Value Assets 162 111 162 111
Change in Unrealized Gains (Losses) for the Period Included in Earnings for Assets Still Held, Assets        
Variable Interest Entity, Primary Beneficiary [Member] | Other Asset-Backed [Member]
       
Beginning Balance, Fair Value Assets 81 146 83 193
Unrealized Gains / (Losses) Included in Earnings, Assets (7) 8 (9) 8
Unrealized Gains / (Losses) Included in OCI, Assets        
Purchases, Assets        
Issuances, Assets        
Settlements, Assets (1)   (2)  
Purchases, Issuances and Settlements, net, Assets       (47)
Transfers into Level 3, Assets 2 [1] 2 [1] 3 2
Transfers out of Level 3, Assets   (3) [1]   (3)
Ending Balance, Fair Value Assets 75 153 75 153
Change in Unrealized Gains (Losses) for the Period Included in Earnings for Assets Still Held, Assets 2   (2)  
Other Asset-Backed [Member]
       
Beginning Balance, Fair Value Assets 323 442 350 401
Unrealized Gains / (Losses) Included in Earnings, Assets        
Unrealized Gains / (Losses) Included in OCI, Assets (7) (7) 1 (25)
Foreign Exchange Recognized in OCI or Earnings, Assets (1)   (1)  
Purchases, Assets 8   9  
Issuances, Assets        
Settlements, Assets (2)   (11)  
Sales, Assets (1)   (2)  
Purchases, Issuances and Settlements, net, Assets   (43)   17
Transfers into Level 3, Assets 11 [1] 5 [1] 13 13
Transfers out of Level 3, Assets   (6) [1] (28) (15)
Ending Balance, Fair Value Assets 331 391 331 391
Change in Unrealized Gains (Losses) for the Period Included in Earnings for Assets Still Held, Assets        
State And Municipal Tax-Exempt Bonds [Member]
       
Beginning Balance, Fair Value Assets 34 45 36 50
Unrealized Gains / (Losses) Included in Earnings, Assets        
Unrealized Gains / (Losses) Included in OCI, Assets   1   1
Purchases, Assets 2   2  
Issuances, Assets        
Settlements, Assets (3)   (5)  
Sales, Assets (1)   (1)  
Purchases, Issuances and Settlements, net, Assets   (8)   (13)
Transfers into Level 3, Assets     [1]    
Transfers out of Level 3, Assets     [1]    
Ending Balance, Fair Value Assets 32 38 32 38
Change in Unrealized Gains (Losses) for the Period Included in Earnings for Assets Still Held, Assets        
State and Municipal Taxable Bonds [Member]
       
Beginning Balance, Fair Value Assets 12   14  
Unrealized Gains / (Losses) Included in OCI, Assets 1   (1)  
Purchases, Assets        
Issuances, Assets        
Transfers out of Level 3, Assets        
Ending Balance, Fair Value Assets 13   13  
Perpetual Preferred Securities [Member]
       
Beginning Balance, Fair Value Assets   83   77
Unrealized Gains / (Losses) Included in Earnings, Assets        
Unrealized Gains / (Losses) Included in OCI, Assets   2   9
Purchases, Issuances and Settlements, net, Assets       (1)
Transfers into Level 3, Assets     [1]    
Transfers out of Level 3, Assets     [1]    
Ending Balance, Fair Value Assets   85   85
Change in Unrealized Gains (Losses) for the Period Included in Earnings for Assets Still Held, Assets        
Variable Interest Entity, Primary Beneficiary [Member] | Credit Derivatives [Member]
       
Beginning Balance, Fair Value Liabilities 926   768  
Unrealized Gains / (Losses) Included in Earnings, Liabilities (6)   152  
Unrealized Gains / (Losses) Included in OCI, Liabilities        
Purchases, Liabilities        
Issuances, Liabilities        
Transfers out of Level 3, Liabilities        
Ending Balance, Fair Value Liabilities 920   920  
Change in Unrealized Gains (Losses) for the Period Included in Earnings for Assets still held, Liabilities (7)   151  
Credit Derivatives [Member]
       
Beginning Balance, Fair Value Liabilities 5,772 5,950 4,350 3,799
Realized Gains / (Losses), Liabilities 193 90 547 153
Unrealized Gains / (Losses) Included in Earnings, Liabilities (115) (1,536) 1,307 674
Unrealized Gains / (Losses) Included in OCI, Liabilities        
Purchases, Liabilities        
Issuances, Liabilities        
Settlements, Liabilities (194)   (548)  
Purchases, Issuances and Settlements, net, Liabilities   (91)   (213)
Transfers into Level 3, Liabilities     [1]    
Transfers out of Level 3, Liabilities     [1]    
Ending Balance, Fair Value Liabilities 5,656 4,413 5,656 4,413
Change in Unrealized Gains (Losses) for the Period Included in Earnings for Assets still held, Liabilities 897 (1,546) 2,128 677
Interest Rate Derivatives [Member]
       
Beginning Balance, Fair Value Liabilities (4) (5) (5) (6)
Realized Gains / (Losses), Liabilities       (8)
Unrealized Gains / (Losses) Included in Earnings, Liabilities (1) (2)   3
Unrealized Gains / (Losses) Included in OCI, Liabilities        
Foreign Exchange Recognized in OCI or Earnings, Liabilities       4
Purchases, Liabilities        
Issuances, Liabilities        
Transfers into Level 3, Liabilities 1 [1]   [1] 1  
Transfers out of Level 3, Liabilities     [1]    
Ending Balance, Fair Value Liabilities (4) (7) (4) (7)
Change in Unrealized Gains (Losses) for the Period Included in Earnings for Assets still held, Liabilities 2 2 1 6
Variable Interest Entity, Primary Beneficiary [Member] | Currency Derivatives [Member]
       
Beginning Balance, Fair Value Liabilities 12   14  
Unrealized Gains / (Losses) Included in Earnings, Liabilities 4   2  
Unrealized Gains / (Losses) Included in OCI, Liabilities        
Purchases, Liabilities        
Issuances, Liabilities        
Transfers out of Level 3, Liabilities        
Ending Balance, Fair Value Liabilities 16   16  
Change in Unrealized Gains (Losses) for the Period Included in Earnings for Assets still held, Liabilities 4   2  
Currency Derivatives [Member]
       
Beginning Balance, Fair Value Liabilities   (12)   (3)
Unrealized Gains / (Losses) Included in Earnings, Liabilities   6   (2)
Unrealized Gains / (Losses) Included in OCI, Liabilities        
Foreign Exchange Recognized in OCI or Earnings, Liabilities   (1)   (2)
Transfers into Level 3, Liabilities     [1]    
Transfers out of Level 3, Liabilities     [1]    
Ending Balance, Fair Value Liabilities   (7)   (7)
Change in Unrealized Gains (Losses) for the Period Included in Earnings for Assets still held, Liabilities   (3)   (12)
Medium-term Notes [Member]
       
Beginning Balance, Fair Value Liabilities 163 118 116 110
Unrealized Gains / (Losses) Included in Earnings, Liabilities 39 2 78 16
Unrealized Gains / (Losses) Included in OCI, Liabilities        
Foreign Exchange Recognized in OCI or Earnings, Liabilities 4 (11) 12 (17)
Purchases, Liabilities        
Issuances, Liabilities        
Transfers into Level 3, Liabilities     [1]    
Transfers out of Level 3, Liabilities     [1]    
Ending Balance, Fair Value Liabilities 206 109 206 109
Change in Unrealized Gains (Losses) for the Period Included in Earnings for Assets still held, Liabilities 39 2 78 16
Variable Interest Entity, Primary Beneficiary [Member] | Variable Interest Entity Notes [Member]
       
Beginning Balance, Fair Value Liabilities 4,953 5,340 4,673  
Unrealized Gains / (Losses) Included in Earnings, Liabilities 2 119 584 134
Unrealized Gains / (Losses) Included in OCI, Liabilities        
Foreign Exchange Recognized in OCI or Earnings, Liabilities   (12)   (6)
Purchases, Liabilities        
Issuances, Liabilities        
Settlements, Liabilities (262)   (564)  
Sales, Liabilities (180)   (180)  
Purchases, Issuances and Settlements, net, Liabilities   (402)   4,917
Transfers into Level 3, Liabilities     [1]    
Transfers out of Level 3, Liabilities     [1]    
Ending Balance, Fair Value Liabilities 4,513 5,045 4,513 5,045
Change in Unrealized Gains (Losses) for the Period Included in Earnings for Assets still held, Liabilities 2   584  
Variable Interest Entity, Primary Beneficiary [Member] | Derivative Contracts Net [Member]
       
Beginning Balance, Fair Value Liabilities   349    
Unrealized Gains / (Losses) Included in Earnings, Liabilities   21   3
Unrealized Gains / (Losses) Included in OCI, Liabilities        
Purchases, Issuances and Settlements, net, Liabilities       367
Transfers into Level 3, Liabilities     [1]    
Transfers out of Level 3, Liabilities     [1]    
Ending Balance, Fair Value Liabilities   370   370
Change in Unrealized Gains (Losses) for the Period Included in Earnings for Assets still held, Liabilities   $ 21   $ 3
[1] Transferred in and out at the end of the period.