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Reinsurance (Summary Of Amounts Receivable From Reinsurers) (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
Reinsurance [Abstract]    
Ceded claim and claim adjustment expenses $ 5,020 $ 6,122
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
Less allowance for doubtful accounts 91 125
Reinsurance receivables, net of allowance for doubtful accounts $ 6,001 $ 7,079