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Insurance (Details 2) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Property and casualty companies [Member]
     
Statutory information      
Net Earnings (Loss) $ 221 $ 375 $ 624
Policyholders' Surplus 2,015 1,976  
Life insurance companies [Member]
     
Statutory information      
Net Earnings (Loss) 171 190 213
Policyholders' Surplus $ 1,343 $ 1,225