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Fair Value of Assets and Liabilities (Details) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2011
Dec. 31, 2010
Sep. 30, 2010
Assets   
Fixed income securities$ 76,394$ 79,612 
Equity securities4,1574,811 
Short-term Investments3,5173,279 
Other investments:   
Free-standing derivatives, assets1 11
Separate account assets6,7918,676 
Total assets at fair value91,26596,938 
Assets as a percent of assets measured at fair value (as a percent)100.00%100.00% 
Other liabilities:   
Free-standing derivatives, liabilities(111) (106)
Total liabilities at fair value(798)(1,016) 
Liabilities as a percent of liabilities measured at fair value (as a percent)100.00%100.00% 
U.S. government and agencies | Recurring
   
Assets   
Fixed income securities4,3468,596 
U.S. government and agencies | Recurring | Quoted prices in active markets for identical assets (Level 1)
   
Assets   
Fixed income securities2,9344,976 
U.S. government and agencies | Recurring | Significant other observable inputs (Level 2)
   
Assets   
Fixed income securities1,4123,620 
Municipal | Recurring
   
Assets   
Fixed income securities14,99915,934 
Municipal | Recurring | Significant other observable inputs (Level 2)
   
Assets   
Fixed income securities13,54613,918 
Municipal | Recurring | Significant unobservable inputs (Level 3)
   
Assets   
Fixed income securities1,4532,016 
Corporate | Recurring
   
Assets   
Fixed income securities44,52937,655 
Corporate | Recurring | Significant other observable inputs (Level 2)
   
Assets   
Fixed income securities42,79935,747 
Corporate | Recurring | Significant unobservable inputs (Level 3)
   
Assets   
Fixed income securities1,7301,908 
Foreign government | Recurring
   
Assets   
Fixed income securities2,1333,158 
Foreign government | Recurring | Significant other observable inputs (Level 2)
   
Assets   
Fixed income securities2,1333,158 
Residential mortgage-backed securities ("RMBS") | Recurring
   
Assets   
Fixed income securities4,6327,993 
Residential mortgage-backed securities ("RMBS") | Recurring | Significant other observable inputs (Level 2)
   
Assets   
Fixed income securities4,5406,199 
Residential mortgage-backed securities ("RMBS") | Recurring | Significant unobservable inputs (Level 3)
   
Assets   
Fixed income securities921,794 
Commercial mortgage-backed securities ("CMBS") | Recurring
   
Assets   
Fixed income securities1,8241,994 
Commercial mortgage-backed securities ("CMBS") | Recurring | Significant other observable inputs (Level 2)
   
Assets   
Fixed income securities1,7481,071 
Commercial mortgage-backed securities ("CMBS") | Recurring | Significant unobservable inputs (Level 3)
   
Assets   
Fixed income securities76923 
Asset-backed securities ("ABS") | Recurring
   
Assets   
Fixed income securities3,9064,244 
Asset-backed securities ("ABS") | Recurring | Significant other observable inputs (Level 2)
   
Assets   
Fixed income securities2,1051,827 
Asset-backed securities ("ABS") | Recurring | Significant unobservable inputs (Level 3)
   
Assets   
Fixed income securities1,8012,417 
Redeemable preferred stock | Recurring
   
Assets   
Fixed income securities2538 
Redeemable preferred stock | Recurring | Significant other observable inputs (Level 2)
   
Assets   
Fixed income securities2437 
Redeemable preferred stock | Recurring | Significant unobservable inputs (Level 3)
   
Assets   
Fixed income securities11 
Recurring
   
Assets   
Fixed income securities76,39479,612 
Equity securities4,1574,811 
Short-term Investments3,5173,279 
Other investments:   
Free-standing derivatives, assets244439 
Separate account assets6,7918,676 
Other assets41 
Total assets at fair value91,10796,818 
Contractholder funds:   
Derivatives embedded in life and annuity contracts(597)(653) 
Other liabilities:   
Free-standing derivatives, liabilities(201)(363) 
Recurring | Quoted prices in active markets for identical assets (Level 1)
   
Assets   
Fixed income securities2,9344,976 
Equity securities3,4884,316 
Short-term Investments200174 
Other investments:   
Separate account assets6,7918,676 
Other assets3  
Total assets at fair value13,41618,142 
Other liabilities:   
Free-standing derivatives, liabilities(3)(2) 
Recurring | Significant other observable inputs (Level 2)
   
Assets   
Fixed income securities68,30765,577 
Equity securities627432 
Short-term Investments3,3173,105 
Other investments:   
Free-standing derivatives, assets383651 
Total assets at fair value72,63469,765 
Other liabilities:   
Free-standing derivatives, liabilities(225)(529) 
Recurring | Significant unobservable inputs (Level 3)
   
Assets   
Fixed income securities5,1539,059 
Equity securities4263 
Other investments:   
Free-standing derivatives, assets174 
Other assets11 
Total assets at fair value5,1979,197 
Contractholder funds:   
Derivatives embedded in life and annuity contracts(597)(653) 
Other liabilities:   
Free-standing derivatives, liabilities(111)(95) 
Recurring | Counterparty and cash collateral netting
   
Other investments:   
Free-standing derivatives, assets(140)(286) 
Total assets at fair value(140)(286) 
Other liabilities:   
Free-standing derivatives, liabilities138263 
Non-recurring
   
Other investments:   
Total assets at fair value158120 
Mortgage loans141111 
Limited partnership interests39 
Other investments14  
Non-recurring | Significant unobservable inputs (Level 3)
   
Other investments:   
Total assets at fair value158120 
Mortgage loans141111 
Limited partnership interests39 
Other investments14  
Quoted prices in active markets for identical assets (Level 1)
   
Other investments:   
Total assets at fair value13,41618,142 
Assets as a percent of assets measured at fair value (as a percent)14.70%18.70% 
Other liabilities:   
Total liabilities at fair value(3)(2) 
Liabilities as a percent of liabilities measured at fair value (as a percent)0.40%0.20% 
Significant other observable inputs (Level 2)
   
Other investments:   
Total assets at fair value72,63469,765 
Assets as a percent of assets measured at fair value (as a percent)79.60%72.00% 
Other liabilities:   
Total liabilities at fair value(225)(529) 
Liabilities as a percent of liabilities measured at fair value (as a percent)28.20%52.10% 
Significant unobservable inputs (Level 3)
   
Other investments:   
Total assets at fair value5,3559,317 
Assets as a percent of assets measured at fair value (as a percent)5.90%9.60% 
Other liabilities:   
Total liabilities at fair value(708)(748) 
Liabilities as a percent of liabilities measured at fair value (as a percent)88.70%73.60% 
Counterparty and cash collateral netting
   
Other investments:   
Total assets at fair value(140)(286) 
Assets as a percent of assets measured at fair value (as a percent)(0.20%)(0.30%) 
Other liabilities:   
Total liabilities at fair value138263 
Liabilities as a percent of liabilities measured at fair value (as a percent)(17.30%)(25.90%) 
U.S. government and agencies
   
Assets   
Fixed income securities4,3468,596 
Municipal
   
Assets   
Fixed income securities14,99915,934 
Corporate
   
Assets   
Fixed income securities44,52937,655 
Foreign government
   
Assets   
Fixed income securities2,1333,158 
Residential mortgage-backed securities ("RMBS")
   
Assets   
Fixed income securities4,6327,993 
Commercial mortgage-backed securities ("CMBS")
   
Assets   
Fixed income securities1,8241,994 
Asset-backed securities ("ABS")
   
Assets   
Fixed income securities3,9064,244 
Redeemable preferred stock
   
Assets   
Fixed income securities$ 25$ 38