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Investments (Securities Held In Unrealized Loss Position And Insured By Financial Guarantor) (Detail) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Schedule Of Investments [Line Items]    
Total Available-For-Sale, Fair Value $ 2,893 $ 1,284
Unrealized Loss (195) (152)
Wrapped Securities [Member]
    
Schedule Of Investments [Line Items]    
Total Available-For-Sale, Fair Value 299  
Unrealized Loss (74)  
Loss and loss adjustment expense reserves 15 [1]  
Asset-backed [Member]
    
Schedule Of Investments [Line Items]    
Total Available-For-Sale, Fair Value 223  
Unrealized Loss (78)  
Asset-backed [Member] | Wrapped Securities [Member]
    
Schedule Of Investments [Line Items]    
Total Available-For-Sale, Fair Value 162  
Unrealized Loss (60)  
Loss and loss adjustment expense reserves 15 [1]  
Asset-backed [Member] | Wrapped Securities [Member] | Mbia Corp And National [Member]
    
Schedule Of Investments [Line Items]    
Total Available-For-Sale, Fair Value 151 [2]  
Unrealized Loss (56) [2]  
Loss and loss adjustment expense reserves 15 [1],[2]  
Asset-backed [Member] | Wrapped Securities [Member] | Other Insurers [Member]
    
Schedule Of Investments [Line Items]    
Total Available-For-Sale, Fair Value 11  
Unrealized Loss (4)  
Loss and loss adjustment expense reserves 0 [1]  
Mortgage-backed [Member]
    
Schedule Of Investments [Line Items]    
Total Available-For-Sale, Fair Value 639  
Unrealized Loss (28)  
Mortgage-backed [Member] | Wrapped Securities [Member]
    
Schedule Of Investments [Line Items]    
Total Available-For-Sale, Fair Value 17  
Unrealized Loss (1)  
Loss and loss adjustment expense reserves 0 [1]  
Mortgage-backed [Member] | Wrapped Securities [Member] | Mbia Corp And National [Member]
    
Schedule Of Investments [Line Items]    
Total Available-For-Sale, Fair Value 2 [2]  
Unrealized Loss 0 [2]  
Loss and loss adjustment expense reserves 0 [1],[2]  
Mortgage-backed [Member] | Wrapped Securities [Member] | Other Insurers [Member]
    
Schedule Of Investments [Line Items]    
Total Available-For-Sale, Fair Value 15  
Unrealized Loss (1)  
Loss and loss adjustment expense reserves 0 [1]  
Corporate Obligations [Member]
    
Schedule Of Investments [Line Items]    
Total Available-For-Sale, Fair Value 566  
Unrealized Loss (38)  
Corporate Obligations [Member] | Wrapped Securities [Member]
    
Schedule Of Investments [Line Items]    
Total Available-For-Sale, Fair Value 11  
Unrealized Loss (9)  
Loss and loss adjustment expense reserves 0 [1]  
Corporate Obligations [Member] | Wrapped Securities [Member] | Mbia Corp And National [Member]
    
Schedule Of Investments [Line Items]    
Total Available-For-Sale, Fair Value 0 [2]  
Unrealized Loss 0 [2]  
Loss and loss adjustment expense reserves 0 [1],[2]  
Corporate Obligations [Member] | Wrapped Securities [Member] | Other Insurers [Member]
    
Schedule Of Investments [Line Items]    
Total Available-For-Sale, Fair Value 11  
Unrealized Loss (9)  
Loss and loss adjustment expense reserves 0 [1]  
All Other Securities [Member] | Wrapped Securities [Member]
    
Schedule Of Investments [Line Items]    
Total Available-For-Sale, Fair Value 109  
Unrealized Loss (4)  
Loss and loss adjustment expense reserves 0 [1]  
All Other Securities [Member] | Wrapped Securities [Member] | Mbia Corp And National [Member]
    
Schedule Of Investments [Line Items]    
Total Available-For-Sale, Fair Value 97 [2]  
Unrealized Loss (4) [2]  
Loss and loss adjustment expense reserves 0 [1],[2]  
All Other Securities [Member] | Wrapped Securities [Member] | Other Insurers [Member]
    
Schedule Of Investments [Line Items]    
Total Available-For-Sale, Fair Value 12  
Unrealized Loss 0  
Loss and loss adjustment expense reserves $ 0 [1]  
[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.