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Reinsurance (Components of Reinsurance Receivables) (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Ceded claim and claim adjustment expenses $ 5,126 $ 5,020 $ 6,122 $ 5,594
Ceded future policy benefits 759 792    
Ceded policyholders' funds 35 36    
Reinsurance receivables related to paid losses 311 244    
Reinsurance receivables 6,231 6,092    
Allowance for uncollectible reinsurance (73) (91)    
Reinsurance receivables, net of allowance for uncollectible reinsurance $ 6,158 $ 6,001