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Fair Value Measurements (Details 5) (USD $)
In Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2011
Jun. 30, 2010
Jun. 30, 2011
Jun. 30, 2010
Fair value assets and liabilities measured on recurring basis, unobservable input reconciliation        
Transfers into Level 3 at end of reporting period, gains and losses not included in realized and unrealized gains and losses related to Level 3 for the period $ 6   $ 31  
Transfers out Level 3 at end of reporting period, gains and losses not included in realized and unrealized gains and losses related to Level 3 for the period. 7   12  
Assets
        
Fair value assets and liabilities measured on recurring basis, unobservable input reconciliation        
Purchases, assets 5,618   6,380  
Sales, assets (340)   (404)  
Settlements, assets (1,595)   (2,980)  
Purchases, Sales, Issuances and Settlements, Net, assets 3,683 (562) 2,996 (2,149)
Obligations of states, municipalities and Political subdivisions | Bonds available for sale
        
Fair value assets and liabilities measured on recurring basis, unobservable input reconciliation        
Purchases, assets 63   176  
Settlements, assets (1)   (2)  
Purchases, Sales, Issuances and Settlements, Net, assets 62 49 174 158
Non-U.S. government | Bonds available for sale
        
Fair value assets and liabilities measured on recurring basis, unobservable input reconciliation        
Purchases, assets 1   1  
Sales, assets (1)   (1)  
Purchases, Sales, Issuances and Settlements, Net, assets 0 24 0 24
Corporate debt | Bonds available for sale
        
Fair value assets and liabilities measured on recurring basis, unobservable input reconciliation        
Purchases, assets 412   420  
Sales, assets 19      
Settlements, assets (126)   (148)  
Purchases, Sales, Issuances and Settlements, Net, assets 305 (126) 272 (235)
Prime residential mortgages | Bonds available for sale
        
Fair value assets and liabilities measured on recurring basis, unobservable input reconciliation        
Purchases, assets 4,307   4,624  
Sales, assets (9)   (22)  
Settlements, assets (393)   (659)  
Purchases, Sales, Issuances and Settlements, Net, assets 3,905 (164) 3,943 (306)
Commercial mortgage-backed securities (CMBS) | Bonds available for sale
        
Fair value assets and liabilities measured on recurring basis, unobservable input reconciliation        
Purchases, assets 99   241  
Sales, assets (20)   (20)  
Settlements, assets (79)   (149)  
Purchases, Sales, Issuances and Settlements, Net, assets   (63) 72 (154)
Multi-sector CDOs | Bonds available for sale
        
Fair value assets and liabilities measured on recurring basis, unobservable input reconciliation        
Purchases, assets 196   261  
Settlements, assets (578)   (1,098)  
Purchases, Sales, Issuances and Settlements, Net, assets (382) (148) (837) (160)
Bonds available for sale
        
Fair value assets and liabilities measured on recurring basis, unobservable input reconciliation        
Purchases, assets 5,078   5,723  
Sales, assets (11)   (43)  
Settlements, assets (1,177)   (2,056)  
Purchases, Sales, Issuances and Settlements, Net, assets 3,890 (428) 3,624 (673)
Non-U.S. government | Bond trading securities
        
Fair value assets and liabilities measured on recurring basis, unobservable input reconciliation        
Purchases, Sales, Issuances and Settlements, Net, assets   (1)   (51)
Corporate debt | Bond trading securities
        
Fair value assets and liabilities measured on recurring basis, unobservable input reconciliation        
Settlements, assets (9)   (9)  
Purchases, Sales, Issuances and Settlements, Net, assets (9) (2) (9) (2)
Prime residential mortgages | Bond trading securities
        
Fair value assets and liabilities measured on recurring basis, unobservable input reconciliation        
Purchases, assets 103   103  
Settlements, assets (23)   (17)  
Purchases, Sales, Issuances and Settlements, Net, assets 80   86  
Commercial mortgage-backed securities (CMBS) | Bond trading securities
        
Fair value assets and liabilities measured on recurring basis, unobservable input reconciliation        
Purchases, assets 60   60  
Sales, assets (49)   (54)  
Settlements, assets (29)   (82)  
Purchases, Sales, Issuances and Settlements, Net, assets (18) (88) (76) (95)
Multi-sector CDOs | Bond trading securities
        
Fair value assets and liabilities measured on recurring basis, unobservable input reconciliation        
Purchases, assets 141   144  
Sales, assets (126)   (126)  
Settlements, assets (100)   (108)  
Purchases, Sales, Issuances and Settlements, Net, assets (85) (49) (90) (136)
Bond trading securities
        
Fair value assets and liabilities measured on recurring basis, unobservable input reconciliation        
Purchases, assets 304   307  
Sales, assets (175)   (180)  
Settlements, assets (161)   (216)  
Purchases, Sales, Issuances and Settlements, Net, assets (32) (140) (89) (284)
Common Stock | Equity securities available for sale
        
Fair value assets and liabilities measured on recurring basis, unobservable input reconciliation        
Sales, assets (8)   (23)  
Settlements, assets (4)   (4)  
Purchases, Sales, Issuances and Settlements, Net, assets (12) (6) (27) (5)
Preferred Stock. | Equity securities available for sale
        
Fair value assets and liabilities measured on recurring basis, unobservable input reconciliation        
Settlements, assets (1)      
Purchases, Sales, Issuances and Settlements, Net, assets (1) (1)   (1)
Equity securities available for sale
        
Fair value assets and liabilities measured on recurring basis, unobservable input reconciliation        
Sales, assets (8)   (23)  
Settlements, assets (5)   (4)  
Purchases, Sales, Issuances and Settlements, Net, assets (13) 1 (27) 2
Equity securities trading
        
Fair value assets and liabilities measured on recurring basis, unobservable input reconciliation        
Settlements, assets (1)   (1)  
Purchases, Sales, Issuances and Settlements, Net, assets (1)   (1)  
Other invested assets
        
Fair value assets and liabilities measured on recurring basis, unobservable input reconciliation        
Purchases, assets 236   350  
Sales, assets (146)   (158)  
Settlements, assets (251)   (703)  
Purchases, Sales, Issuances and Settlements, Net, assets (161) 5 (511) (924)
Liabilities
        
Fair value assets and liabilities measured on recurring basis, unobservable input reconciliation        
Purchases, liabilities     39  
Sales, liabilities (10)   (19)  
Settlements, liabilities 173   277  
Purchases, Sales, Issuances and Settlements, Net, liabilities 163 185 297 165
Policyholder contract deposits
        
Fair value assets and liabilities measured on recurring basis, unobservable input reconciliation        
Sales, liabilities (10)   (19)  
Settlements, liabilities 6   12  
Purchases, Sales, Issuances and Settlements, Net, liabilities (4) (129) (7) (268)
Derivative liabilities, net
        
Fair value assets and liabilities measured on recurring basis, unobservable input reconciliation        
Purchases, liabilities     39  
Settlements, liabilities (28)   9  
Purchases, Sales, Issuances and Settlements, Net, liabilities (28) 247 48 (189)
Interest rate contracts
        
Fair value assets and liabilities measured on recurring basis, unobservable input reconciliation        
Settlements, liabilities (3)      
Purchases, Sales, Issuances and Settlements, Net, liabilities (3) 99   195
Equity contracts
        
Fair value assets and liabilities measured on recurring basis, unobservable input reconciliation        
Purchases, liabilities     39  
Settlements, liabilities     (1)  
Purchases, Sales, Issuances and Settlements, Net, liabilities   (31) 38 (31)
Commodity contracts
        
Fair value assets and liabilities measured on recurring basis, unobservable input reconciliation        
Settlements, liabilities (9)   (20)  
Purchases, Sales, Issuances and Settlements, Net, liabilities (9)   (20)  
Credit contracts
        
Fair value assets and liabilities measured on recurring basis, unobservable input reconciliation        
Settlements, liabilities (6)   (10)  
Purchases, Sales, Issuances and Settlements, Net, liabilities (6) 166 (10) (363)
Other contracts
        
Fair value assets and liabilities measured on recurring basis, unobservable input reconciliation        
Settlements, liabilities (10)   40  
Purchases, Sales, Issuances and Settlements, Net, liabilities (10) 16 40 13
Other long-term debt
        
Fair value assets and liabilities measured on recurring basis, unobservable input reconciliation        
Settlements, liabilities 195   256  
Purchases, Sales, Issuances and Settlements, Net, liabilities $ 195 $ 67 $ 256 $ 622