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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
Jun. 30, 2016
Dec. 31, 2015
Loss And Loss Adjustment Expense Reserves [Line Items]    
Insurance claim loss recoverable $ (363) $ (571)
LAE insurance loss recoverable (2) (6)
Insurance loss recoverable (365) (577)
Reinsurance recoverable on unpaid losses 6 6
Reinsurance recoverable on unpaid LAE 1 0
Reinsurance recoverable on paid losses   0
Reinsurance recoverable on paid and unpaid losses 7 6
Loss Reserves Claim Liability [Member]    
Loss And Loss Adjustment Expense Reserves [Line Items]    
Loss and loss adjustment expense reserves 486 470
Lae Reserves [Member]    
Loss And Loss Adjustment Expense Reserves [Line Items]    
Loss and loss adjustment expense reserves 60 46
Loss And Lae Reserves [Member]    
Loss And Loss Adjustment Expense Reserves [Line Items]    
Loss and loss adjustment expense reserves $ 546 $ 516