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Loss And Loss Adjustment Expense Reserves (Schedule Of Present Value Of The Probability-Weighted Future Claim Payments And Recoveries) (Detail) - USD ($)
$ in Millions
Mar. 31, 2016
Dec. 31, 2015
Loss And Loss Adjustment Expense Reserves [Line Items]    
Insurance claim loss recoverable $ (407) $ (571)
LAE insurance loss recoverable (2) (6)
Insurance loss recoverable (409) (577)
Reinsurance recoverable on unpaid losses 5 6
Reinsurance recoverable on unpaid LAE 1  
Reinsurance recoverable on paid and unpaid losses 6 6
Loss Reserves Claim Liability [Member]    
Loss And Loss Adjustment Expense Reserves [Line Items]    
Loss and loss adjustment expense reserves 476 470
Lae Reserves [Member]    
Loss And Loss Adjustment Expense Reserves [Line Items]    
Loss and loss adjustment expense reserves 49 46
Loss And Lae Reserves [Member]    
Loss And Loss Adjustment Expense Reserves [Line Items]    
Loss and loss adjustment expense reserves $ 525 $ 516