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Invested Assets (Details 5) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Realized investment gains and losses [Abstract]        
Fixed maturities, Gross realized gains $ 24 $ 10 $ 62 $ 23
Fixed maturities, Gross realized losses (7) (4) (10) (15)
Fixed maturities, Other-than-temporary impairment losses (1)   (2)  
Total fixed maturities 16 6 50 8
Equity securities, Gross realized gains 6 10 25 29
Equity securities, Gross realized losses   (1)   (1)
Equity securities, Other-than-temporary impairment losses (30) (14) (35) (16)
Total equity securities (24) (5) (10) 12
Other invested assets 55 68 63 209
Total Realized Investment Gains, Net $ 47 $ 69 $ 103 $ 229