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INVESTMENTS (Details) (USD $)
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Available-for-sale Securities and Alternative Investments Excluding held-for-sale Investments Balance Sheet Reported Amounts [Abstract]    
Available-for-sale Securities, Other-Than- Temporary Impairments in AOCI $ (856,000,000) $ (761,000,000)
Other invested assets carried at fair value, Amortized Cost or Cost 5,155,000,000 5,392,000,000
Other invested assets carried at fair value, Gross Unrealized Gains 1,611,000,000 1,256,000,000
Other invested assets carried at fair value, Gross Unrealized Losses (269,000,000) (60,000,000)
Other invested assets carried at fair value, fair value 6,497,000,000 6,588,000,000
Total, Amortized Cost or Cost 257,745,000,000 228,632,000,000
Total, Gross Unrealized Gains 21,637,000,000 16,038,000,000
Total, Gross Unrealized Losses 5,280,000,000 5,199,000,000
Total, fair value 274,102,000,000 239,471,000,000
Total, Other-Than-Temporary Impairments in AOCI (856,000,000) (761,000,000)
Other details of available-for-sale securities    
Minimum percentage of fair value of available for sale securities pledged by counterparties under secured financing transactions 102.00%  
Available for sale securities at fair value loaned to counterparties under secured financing transactions 2,300,000,000  
Assets held-for-sale
   
Available-for-sale Securities and Alternative Investments Excluding held-for-sale Investments Balance Sheet Reported Amounts [Abstract]    
Available for Sale Securities, fair value   80,500,000,000
Available-for-sale Securities and other invested assets, Gross Unrealized Gain (Loss)   604,000,000
Bonds available for sale
   
Available-for-sale Securities and Alternative Investments Excluding held-for-sale Investments Balance Sheet Reported Amounts [Abstract]    
Available-for-sale Securities, Amortized Cost or Cost 250,770,000,000 220,669,000,000
Available-for-sale Securities, Gross Unrealized Gains 18,121,000,000 12,717,000,000
Available-for-sale Securities, Gross Unrealized Losses (4,910,000,000) (5,084,000,000)
Available for Sale Securities, fair value 263,981,000,000 228,302,000,000
Available-for-sale Securities, Other-Than- Temporary Impairments in AOCI (856,000,000) (761,000,000)
Other details of available-for-sale securities    
Available for sale securities not rated or rated below investment grade 24,200,000,000 18,600,000,000
Bonds available for sale | U.S. government and government sponsored entities
   
Available-for-sale Securities and Alternative Investments Excluding held-for-sale Investments Balance Sheet Reported Amounts [Abstract]    
Available-for-sale Securities, Amortized Cost or Cost 5,661,000,000 7,239,000,000
Available-for-sale Securities, Gross Unrealized Gains 418,000,000 184,000,000
Available-for-sale Securities, Gross Unrealized Losses (1,000,000) (73,000,000)
Available for Sale Securities, fair value 6,078,000,000 7,350,000,000
Bonds available for sale | Obligations of states, municipalities and political subdivisions
   
Available-for-sale Securities and Alternative Investments Excluding held-for-sale Investments Balance Sheet Reported Amounts [Abstract]    
Available-for-sale Securities, Amortized Cost or Cost 35,017,000,000 45,297,000,000
Available-for-sale Securities, Gross Unrealized Gains 2,554,000,000 1,725,000,000
Available-for-sale Securities, Gross Unrealized Losses (73,000,000) (402,000,000)
Available for Sale Securities, fair value 37,498,000,000 46,620,000,000
Available-for-sale Securities, Other-Than- Temporary Impairments in AOCI (28,000,000) 2,000,000
Bonds available for sale | Non-U.S. government
   
Available-for-sale Securities and Alternative Investments Excluding held-for-sale Investments Balance Sheet Reported Amounts [Abstract]    
Available-for-sale Securities, Amortized Cost or Cost 24,568,000,000 16,142,000,000
Available-for-sale Securities, Gross Unrealized Gains 1,269,000,000 741,000,000
Available-for-sale Securities, Gross Unrealized Losses (102,000,000) (75,000,000)
Available for Sale Securities, fair value 25,735,000,000 16,808,000,000
Available-for-sale Securities, Other-Than- Temporary Impairments in AOCI   (28,000,000)
Bonds available for sale | Corporate debt
   
Available-for-sale Securities and Alternative Investments Excluding held-for-sale Investments Balance Sheet Reported Amounts [Abstract]    
Available-for-sale Securities, Amortized Cost or Cost 134,974,000,000 117,367,000,000
Available-for-sale Securities, Gross Unrealized Gains 11,569,000,000 8,725,000,000
Available-for-sale Securities, Gross Unrealized Losses (1,725,000,000) (1,198,000,000)
Available for Sale Securities, fair value 144,818,000,000 124,894,000,000
Available-for-sale Securities, Other-Than- Temporary Impairments in AOCI 115,000,000 99,000,000
Bonds available for sale | Mortgage backed, asset backed and collateralized
   
Available-for-sale Securities and Alternative Investments Excluding held-for-sale Investments Balance Sheet Reported Amounts [Abstract]    
Available-for-sale Securities, Amortized Cost or Cost 50,550,000,000 34,624,000,000
Available-for-sale Securities, Gross Unrealized Gains 2,311,000,000 1,342,000,000
Available-for-sale Securities, Gross Unrealized Losses (3,009,000,000) (3,336,000,000)
Available for Sale Securities, fair value 49,852,000,000 32,630,000,000
Available-for-sale Securities, Other-Than- Temporary Impairments in AOCI (943,000,000) (834,000,000)
Bonds available for sale | Residential mortgage backed securities (RMBS)
   
Available-for-sale Securities and Alternative Investments Excluding held-for-sale Investments Balance Sheet Reported Amounts [Abstract]    
Available-for-sale Securities, Amortized Cost or Cost 34,780,000,000 20,661,000,000
Available-for-sale Securities, Gross Unrealized Gains 1,387,000,000 700,000,000
Available-for-sale Securities, Gross Unrealized Losses (1,563,000,000) (1,553,000,000)
Available for Sale Securities, fair value 34,604,000,000 19,808,000,000
Available-for-sale Securities, Other-Than- Temporary Impairments in AOCI (716,000,000) (648,000,000)
Bonds available for sale | Commercial mortgage-backed securities (CMBS)
   
Available-for-sale Securities and Alternative Investments Excluding held-for-sale Investments Balance Sheet Reported Amounts [Abstract]    
Available-for-sale Securities, Amortized Cost or Cost 8,449,000,000 7,320,000,000
Available-for-sale Securities, Gross Unrealized Gains 470,000,000 240,000,000
Available-for-sale Securities, Gross Unrealized Losses (973,000,000) (1,149,000,000)
Available for Sale Securities, fair value 7,946,000,000 6,411,000,000
Available-for-sale Securities, Other-Than- Temporary Impairments in AOCI (276,000,000) (218,000,000)
Bonds available for sale | Collateralized Debt Obligations/Asset Backed Securities (CDO/ABS)
   
Available-for-sale Securities and Alternative Investments Excluding held-for-sale Investments Balance Sheet Reported Amounts [Abstract]    
Available-for-sale Securities, Amortized Cost or Cost 7,321,000,000 6,643,000,000
Available-for-sale Securities, Gross Unrealized Gains 454,000,000 402,000,000
Available-for-sale Securities, Gross Unrealized Losses (473,000,000) (634,000,000)
Available for Sale Securities, fair value 7,302,000,000 6,411,000,000
Available-for-sale Securities, Other-Than- Temporary Impairments in AOCI 49,000,000 32,000,000
Equity securities available for sale
   
Available-for-sale Securities and Alternative Investments Excluding held-for-sale Investments Balance Sheet Reported Amounts [Abstract]    
Available-for-sale Securities, Amortized Cost or Cost 1,820,000,000 2,571,000,000
Available-for-sale Securities, Gross Unrealized Gains 1,905,000,000 2,065,000,000
Available-for-sale Securities, Gross Unrealized Losses (101,000,000) (55,000,000)
Available for Sale Securities, fair value 3,624,000,000 4,581,000,000
Equity securities available for sale | Common Stock
   
Available-for-sale Securities and Alternative Investments Excluding held-for-sale Investments Balance Sheet Reported Amounts [Abstract]    
Available-for-sale Securities, Amortized Cost or Cost 1,682,000,000 1,820,000,000
Available-for-sale Securities, Gross Unrealized Gains 1,839,000,000 1,931,000,000
Available-for-sale Securities, Gross Unrealized Losses (100,000,000) (52,000,000)
Available for Sale Securities, fair value 3,421,000,000 3,699,000,000
Equity securities available for sale | Preferred Stock
   
Available-for-sale Securities and Alternative Investments Excluding held-for-sale Investments Balance Sheet Reported Amounts [Abstract]    
Available-for-sale Securities, Amortized Cost or Cost 83,000,000 400,000,000
Available-for-sale Securities, Gross Unrealized Gains 60,000,000 88,000,000
Available-for-sale Securities, Gross Unrealized Losses   (1,000,000)
Available for Sale Securities, fair value 143,000,000 487,000,000
Equity securities available for sale | Mutual Funds
   
Available-for-sale Securities and Alternative Investments Excluding held-for-sale Investments Balance Sheet Reported Amounts [Abstract]    
Available-for-sale Securities, Amortized Cost or Cost 55,000,000 351,000,000
Available-for-sale Securities, Gross Unrealized Gains 6,000,000 46,000,000
Available-for-sale Securities, Gross Unrealized Losses (1,000,000) (2,000,000)
Available for Sale Securities, fair value $ 60,000,000 $ 395,000,000