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Invested Assets (Details 2) (USD $)
In Millions
Sep. 30, 2011
Dec. 31, 2010
Components of unrealized appreciation or depreciation of investments [Abstract]  
Fixed maturities, Gross unrealized appreciation$ 2,277$ 1,630
Fixed maturities, Gross unrealized depreciation88172
Fixed maturities, Unrealized appreciation (depreciation), Net2,1891,458
Equity securities, Gross unrealized appreciation232340
Equity securities, Gross unrealized depreciation13775
Equity securities, Unrealized appreciation (depreciation), Net95265
Total fixed maturities and equity securities, Unrealized appreciation (depreciation), Net2,2841,723
Deferred income tax liability799603
Total fixed maturities and equity securities, Unrealized appreciation (depreciation), Net of tax$ 1,485$ 1,120