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Insurance (Details 2) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Property and casualty companies [Member]
     
Statutory information      
Net Earnings (Loss) $ 375 $ 624 $ 574
Policyholders' Surplus 1,976 2,101  
Life insurance companies [Member]
     
Statutory information      
Net Earnings (Loss) 190 213 (76)
Policyholders' Surplus $ 1,225 $ 1,153