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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, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Loss Reserves Claim Liability [Member] | Classified [Member]
    
Loss And Loss Adjustment Expense Reserves [Line Items]    
Loss and loss adjustment expense reserves $ 711 $ 790
Lae Reserves [Member] | Classified [Member]
    
Loss And Loss Adjustment Expense Reserves [Line Items]    
Loss and loss adjustment expense reserves 63 63
Loss And Lae Reserves [Member]
    
Loss And Loss Adjustment Expense Reserves [Line Items]    
Loss and loss adjustment expense reserves 774 853
Loss And Lae Reserves [Member] | Classified [Member]
    
Loss And Loss Adjustment Expense Reserves [Line Items]    
Loss and loss adjustment expense reserves 774 853
Insurance Loss Recoverable [Member]
    
Loss And Loss Adjustment Expense Reserves [Line Items]    
Insurance loss recoverable (907) (3,648)
Insurance Loss Recoverable [Member] | Classified [Member]
    
Loss And Loss Adjustment Expense Reserves [Line Items]    
Insurance claim loss recoverable (902) (3,610)
LAE insurance loss recoverable (5) (38)
Insurance loss recoverable (907) (3,648)
Reinsurance recoverable on unpaid losses 13 14
Reinsurance recoverable on unpaid LAE 1 0
Reinsurance recoverable on paid losses 0 1
Reinsurance recoverable on paid and unpaid losses $ 14 $ 15