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Loss And Loss Adjustment Expense Reserves (Schedule Of Present Value Of The Probability-Weighted Future Claim Payments And Recoveries) (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2012
Dec. 31, 2011
Loss Reserves (Claim Liability) [Member] | Classified [Member]
    
Loss And Loss Adjustment Expense Reserves [Line Items]    
Loss adjustment expense reserves $ 755 $ 781
LAE Reserves [Member] | Classified [Member]
    
Loss And Loss Adjustment Expense Reserves [Line Items]    
Loss adjustment expense reserves 112 55
Reinsurance recoverable 0 0
Loss And LAE Reserves [Member]
    
Loss And Loss Adjustment Expense Reserves [Line Items]    
Loss adjustment expense reserves 867 836
Loss And LAE Reserves [Member] | Classified [Member]
    
Loss And Loss Adjustment Expense Reserves [Line Items]    
Loss adjustment expense reserves 867 836
Insurance Loss Recoverable [Member]
    
Loss And Loss Adjustment Expense Reserves [Line Items]    
Insurance claim loss recoverable 2,100  
Insurance Loss Recoverable [Member] | Classified [Member]
    
Loss And Loss Adjustment Expense Reserves [Line Items]    
Insurance claim loss recoverable (3,116) (3,032)
LAE insurance loss recoverable (21) (14)
Insurance loss recoverable (3,137) (3,046)
Reinsurance recoverable 14 15
Reinsurance recoverable on paid losses 1 1
Reinsurance recoverable on paid and unpaid losses $ 15 $ 16