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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 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Loss And Loss Adjustment Expense Reserves [Line Items]        
Losses and LAE related to actual and expected payments     $ 211  
Recoveries of actual and expected payments     (215)  
Gross losses incurred     (4)  
Reinsurance     (2)  
Losses and LAE 188 62 (6) 159
Second-Lien RMBS [Member]
        
Loss And Loss Adjustment Expense Reserves [Line Items]        
Losses and LAE related to actual and expected payments     99  
Recoveries of actual and expected payments     (219)  
Gross losses incurred     (120)  
Reinsurance     0  
Losses and LAE     (120)  
First-Lien RMBS [Member]
        
Loss And Loss Adjustment Expense Reserves [Line Items]        
Losses and LAE related to actual and expected payments     (2)  
Recoveries of actual and expected payments     (5)  
Gross losses incurred     (7)  
Reinsurance     0  
Losses and LAE     (7)  
Other [Member]
        
Loss And Loss Adjustment Expense Reserves [Line Items]        
Losses and LAE related to actual and expected payments     114 [1]  
Recoveries of actual and expected payments     9 [1]  
Gross losses incurred     123 [1]  
Reinsurance     (2) [1]  
Losses and LAE     $ 121 [1]  
[1] Includes ABS CDOs, CMBS, U.S. public finance and other issues.