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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, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Loss And Loss Adjustment Expense Reserves [Line Items]        
Losses and LAE related to expected payments     $ (56)  
Recoveries of expected payments     138  
Gross losses incurred     82  
Reinsurance     0  
Losses and LAE 20 98 82 92
Second-Lien RMBS [Member]
        
Loss And Loss Adjustment Expense Reserves [Line Items]        
Losses and LAE related to expected payments     13  
Recoveries of expected payments     75  
Gross losses incurred     88  
Reinsurance     0  
Losses and LAE     88  
First-Lien RMBS [Member]
        
Loss And Loss Adjustment Expense Reserves [Line Items]        
Losses and LAE related to expected payments     43  
Recoveries of expected payments     (4)  
Gross losses incurred     39  
Reinsurance     0  
Losses and LAE     39  
Other [Member]
        
Loss And Loss Adjustment Expense Reserves [Line Items]        
Losses and LAE related to expected payments     (112) [1]  
Recoveries of expected payments     67 [1]  
Gross losses incurred     (45) [1]  
Reinsurance     0 [1]  
Losses and LAE     $ (45) [1]  
[1]
Includes ABS CDOs, CMBS, U.S. public finance and other issues.