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Investment Income And Gains And Losses (Net Unrealized Gains (Losses), Including Portion Of Other-Than-Temporary Impairments Included In Other Comprehensive Loss, Reported Within Shareholders' Equity) (Details) (USD $)
In Millions
Jun. 30, 2011
Dec. 31, 2010
Deferred income tax provision (benefit) $ (103) $ (208)
Unrealized gains (losses), net (151) (392)
Total (254) (600)
Fixed-Maturity Investments [Member]
    
Gains 225 208
Losses (524) (782)
Foreign exchange 49 (14)
Net (250) (588)
Other Investments [Member]
    
Gains 4 10
Losses (8) (22)
Net $ (4) $ (12)