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Loss And Loss Adjustment Expense Reserves (Schedule Of Expenses Related To Remedial Actions For Insured Obligations) (Detail) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Loss And Loss Adjustment Expense Reserves [Line Items]        
Policyholder (Benefits) And Claims Incurred Net $ 188 $ 62 $ (6) $ 159
Remedial Actions For Insured Obligations [Member]
        
Loss And Loss Adjustment Expense Reserves [Line Items]        
Loss adjustment expense incurred, gross     $ 33 $ 81