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Investments (Details 7) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Dec. 31, 2012
Investments      
Net unrealized gains related to changes in valuation of fixed income securities subsequent to impairment measurement date $ 252   $ 219
Other-than Impairment Losses Included in Accumulated Other Comprehensive Income      
Amount of other-than-temporary impairment losses included in accumulated other comprehensive income for fixed income securities, not included in earnings (206)   (236)
Credit Losses on Fixed Income Securities      
Balance (617) (944)  
Additional credit loss for securities previously other-than-temporarily impaired (15) (20)  
Additional credit loss for securities not previously other-than-temporarily impaired (15) (9)  
Reduction in credit loss for securities disposed or collected 47 146  
Reduction in credit loss for securities the Company has made the decision to sell or more likely than not will be required to sell   7  
Balance (600) (820)  
Municipal
     
Other-than Impairment Losses Included in Accumulated Other Comprehensive Income      
Amount of other-than-temporary impairment losses included in accumulated other comprehensive income for fixed income securities, not included in earnings (14)   (20)
Corporate
     
Other-than Impairment Losses Included in Accumulated Other Comprehensive Income      
Amount of other-than-temporary impairment losses included in accumulated other comprehensive income for fixed income securities, not included in earnings (1)   (1)
Asset-backed securities ("ABS")
     
Other-than Impairment Losses Included in Accumulated Other Comprehensive Income      
Amount of other-than-temporary impairment losses included in accumulated other comprehensive income for fixed income securities, not included in earnings (12)   (14)
Residential mortgage-backed securities ("RMBS")
     
Other-than Impairment Losses Included in Accumulated Other Comprehensive Income      
Amount of other-than-temporary impairment losses included in accumulated other comprehensive income for fixed income securities, not included in earnings (167)   (182)
Commercial mortgage-backed securities ("CMBS")
     
Other-than Impairment Losses Included in Accumulated Other Comprehensive Income      
Amount of other-than-temporary impairment losses included in accumulated other comprehensive income for fixed income securities, not included in earnings $ (12)   $ (19)