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Invested Assets (Details 6) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2011
Position
Dec. 31, 2010
Invested Assets (Textual) [Abstract]  
Fixed maturities other-than-temporary impairment losses in gross unrealized depreciation$ 2$ 4
Individual fixed maturity and equity securities in unrealized loss position595 
Individual fixed maturities in unrealized loss position540 
Cumulative credit losses recognized in net income$ 20$ 21