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Reinsurance (Components of Reinsurance Receivables) (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Dec. 31, 2008
Reinsurance receivables related to insurance reserves        
Ceded claim and claim adjustment expenses $ 5,020 $ 6,122 $ 5,594 $ 6,288
Ceded future policy benefits 792 822    
Ceded policyholders' funds 36 37    
Reinsurance receivables related to paid losses 244 223    
Reinsurance receivables 6,092 7,204    
Allowance for uncollectible reinsurance (91) (125)    
Reinsurance receivables, net of allowance for uncollectible reinsurance $ 6,001 $ 7,079