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Loss And Loss Adjustment Expense Reserves (Schedule Of Losses And Loss Adjustment Expenses) (Detail) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Loss And Loss Adjustment Expense Reserves [Line Items]        
Losses and LAE related to actual and expected payments     $ 205  
Recoveries of actual and expected payments     (112)  
Gross losses incurred     93  
Reinsurance     (1)  
Losses and LAE 98 171 92 330
Second-Lien RMBS [Member]
        
Loss And Loss Adjustment Expense Reserves [Line Items]        
Losses and LAE related to actual and expected payments     85  
Recoveries of actual and expected payments     (177)  
Gross losses incurred     (92)  
Reinsurance     0  
Losses and LAE     (92)  
First-Lien RMBS [Member]
        
Loss And Loss Adjustment Expense Reserves [Line Items]        
Losses and LAE related to actual and expected payments     12  
Recoveries of actual and expected payments     (11)  
Gross losses incurred     1  
Reinsurance     0  
Losses and LAE     1  
Other [Member]
        
Loss And Loss Adjustment Expense Reserves [Line Items]        
Losses and LAE related to actual and expected payments     108 [1]  
Recoveries of actual and expected payments     76 [1]  
Gross losses incurred     184 [1]  
Reinsurance     (1) [1]  
Losses and LAE     $ 183 [1]  
[1] Includes ABS CDOs, CMBS, U.S. public finance and other issues.