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Invested Assets (Details 6) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2011
Dec. 31, 2010
Invested Assets (Textuals) [Abstract]    
Fixed maturities other-than-temporary impairment losses in gross unrealized depreciation $ 3 $ 4
Individual fixed maturity and equity securities in unrealized loss position 600  
Individual fixed maturities in unrealized loss position 570  
Cumulative credit losses recognized in net income $ 20 $ 21