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Loss And Loss Adjustment Expense Reserves (Schedule Of Expenses Related To Remedial Actions For Insured Obligations) (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Loss And Loss Adjustment Expense Reserves [Line Items]    
Loss adjustment expense incurred, net $ 97  
Remedial Actions For Insured Obligations [Member]
    
Loss And Loss Adjustment Expense Reserves [Line Items]    
Loss adjustment expense incurred, gross 75 15
Loss adjustment expense incurred, net $ 75 $ 15