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Investments (Securities Held In Unrealized Loss Position And Insured By Financial Guarantor) (Detail) - USD ($)
$ in Millions
Jun. 30, 2016
Dec. 31, 2015
Schedule Of Investments [Line Items]    
Total Available-For-Sale, Fair Value $ 777 $ 2,802
Wrapped Securities [Member]    
Schedule Of Investments [Line Items]    
Total Available-For-Sale, Fair Value 78  
Gross unrealized losses (11)  
Loss and loss adjustment expense reserves [1] 21  
Asset-backed [Member]    
Schedule Of Investments [Line Items]    
Total Available-For-Sale, Fair Value 238  
Gross unrealized losses (9)  
Asset-backed [Member] | Wrapped Securities [Member] | Mbia Corp And National [Member]    
Schedule Of Investments [Line Items]    
Total Available-For-Sale, Fair Value [2] 51  
Gross unrealized losses [2] (7)  
Loss and loss adjustment expense reserves [1],[2] 17  
Mortgage-backed [Member]    
Schedule Of Investments [Line Items]    
Total Available-For-Sale, Fair Value 268  
Gross unrealized losses (8)  
Mortgage-backed [Member] | Wrapped Securities [Member] | Mbia Corp And National [Member]    
Schedule Of Investments [Line Items]    
Total Available-For-Sale, Fair Value [2] 17  
Gross unrealized losses [2] (3)  
Loss and loss adjustment expense reserves [1],[2] 4  
Corporate Obligations [Member]    
Schedule Of Investments [Line Items]    
Total Available-For-Sale, Fair Value 214  
Gross unrealized losses (79)  
All Other Securities [Member] | Wrapped Securities [Member]    
Schedule Of Investments [Line Items]    
Total Available-For-Sale, Fair Value 10  
Gross unrealized losses (1)  
Loss and loss adjustment expense reserves [1] 0  
All Other Securities [Member] | Wrapped Securities [Member] | Mbia Corp And National [Member]    
Schedule Of Investments [Line Items]    
Total Available-For-Sale, Fair Value [2] 8  
Gross unrealized losses [2] (1)  
Loss and loss adjustment expense reserves [1],[2] 0  
All Other Securities [Member] | Wrapped Securities [Member] | Other Insurers [Member]    
Schedule Of Investments [Line Items]    
Total Available-For-Sale, Fair Value 2  
Gross unrealized losses 0  
Loss and loss adjustment expense reserves [1] $ 0  
[1] Insurance loss reserve estimates are based on the proportion of par value owned to the total amount of par value insured.
[2] Includes investments insured by MBIA Corp. and National.