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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
Sep. 30, 2015
Dec. 31, 2014
Loss And Loss Adjustment Expense Reserves [Line Items]    
LAE insurance loss recoverable $ 0 $ 0
Insurance loss recoverable (437) (533)
Reinsurance recoverable on unpaid losses 6 6
Reinsurance recoverable on unpaid LAE 0 1
Reinsurance recoverable on paid and unpaid losses 6 7
Loss Reserves Claim Liability [Member] | Classified [Member]    
Loss And Loss Adjustment Expense Reserves [Line Items]    
Loss and loss adjustment expense reserves 447 464
Lae Reserves [Member] | Classified [Member]    
Loss And Loss Adjustment Expense Reserves [Line Items]    
Loss and loss adjustment expense reserves 33 42
Loss And Lae Reserves [Member]    
Loss And Loss Adjustment Expense Reserves [Line Items]    
Loss and loss adjustment expense reserves $ 480 $ 506