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Loss And Loss Adjustment Expense Reserves (Present Value Of Probability-Weighted Future Claim Payments And Recoveries) (Detail) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Loss And Loss Adjustment Expense Reserves [Line Items]    
Insurance loss recoverable $ (3,316) $ (3,046)
Loss Reserves (Claim Liability) [Member] | Classified [Member]
    
Loss And Loss Adjustment Expense Reserves [Line Items]    
Loss and Loss Adjustment Expense Reserves 862 781
LAE Reserves [Member] | Classified [Member]
    
Loss And Loss Adjustment Expense Reserves [Line Items]    
Loss and Loss Adjustment Expense Reserves 83 55
Loss And LAE Reserves [Member]
    
Loss And Loss Adjustment Expense Reserves [Line Items]    
Loss and Loss Adjustment Expense Reserves 945 836
Loss And LAE Reserves [Member] | Classified [Member]
    
Loss And Loss Adjustment Expense Reserves [Line Items]    
Loss and Loss Adjustment Expense Reserves 945 836
Insurance Claim Loss Recoverable [Member] | Classified [Member]
    
Loss And Loss Adjustment Expense Reserves [Line Items]    
Insurance claim loss recoverable (3,281) (3,032)
LAE insurance loss recoverable (35) (14)
Insurance loss recoverable (3,316) (3,046)
Reinsurance recoverable on unpaid losses 13 15
Reinsurance recoverable on paid losses 2 1
Reinsurance recoverable on paid and unpaid losses $ 15 $ 16