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Investments (Securities Held In Unrealized Loss Position And Insured By Financial Guarantor) (Detail) - USD ($)
$ in Millions
Sep. 30, 2015
Dec. 31, 2014
Schedule Of Investments [Line Items]    
Total Available-For-Sale, Fair Value $ 2,019 $ 2,071
Wrapped Securities [Member]    
Schedule Of Investments [Line Items]    
Total Available-For-Sale, Fair Value 192  
Gross unrealized losses (33)  
Loss and loss adjustment expense reserves [1] 34  
Asset-backed [Member]    
Schedule Of Investments [Line Items]    
Total Available-For-Sale, Fair Value 307  
Gross unrealized losses (30)  
Asset-backed [Member] | Wrapped Securities [Member] | Mbia Corp And National [Member]    
Schedule Of Investments [Line Items]    
Total Available-For-Sale, Fair Value [2] 93  
Gross unrealized losses [2] (28)  
Loss and loss adjustment expense reserves [1],[2] 20  
Mortgage-backed [Member]    
Schedule Of Investments [Line Items]    
Total Available-For-Sale, Fair Value 495  
Gross unrealized losses (10)  
Mortgage-backed [Member] | Wrapped Securities [Member] | Mbia Corp And National [Member]    
Schedule Of Investments [Line Items]    
Total Available-For-Sale, Fair Value [2] 19  
Gross unrealized losses [2] (1)  
Loss and loss adjustment expense reserves [1],[2] 14  
Corporate Obligations [Member]    
Schedule Of Investments [Line Items]    
Total Available-For-Sale, Fair Value 610  
Gross unrealized losses (104)  
Corporate Obligations [Member] | Wrapped Securities [Member] | Mbia Corp And National [Member]    
Schedule Of Investments [Line Items]    
Total Available-For-Sale, Fair Value [2] 0  
Gross unrealized losses [2] 0  
Loss and loss adjustment expense reserves [1],[2] 0  
All Other Securities [Member] | Wrapped Securities [Member]    
Schedule Of Investments [Line Items]    
Total Available-For-Sale, Fair Value 80  
Gross unrealized losses (4)  
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] 79  
Gross unrealized losses [2] (4)  
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 1  
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.