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Loss And Loss Adjustment Expense Reserves (Loss And LAE Activity)(Narrative) (Detail) (USD $)
 9 Months Ended 9 Months Ended 57 Months Ended 9 Months Ended 9 Months Ended
Sep. 30, 2012
Dec. 31, 2011
Sep. 30, 2012
ABS CDO Portfolio [Member]
Sep. 30, 2012
ABS CDO Portfolio [Member]
Sep. 30, 2012
RMBS And HELOC And CES [Member]
Sep. 30, 2012
RMBS And HELOC And CES [Member]
Classified [Member]
Reviewed [Member]
Sep. 30, 2012
RMBS And HELOC And CES [Member]
Insured Issues Designated As "Classified List" [Member]
Sep. 30, 2012
Financial Guarantee [Member]
Sep. 30, 2012
Financial Guarantee [Member]
Variable Interest Entity [Member]
Sep. 30, 2012
Loss And LAE Reserves [Member]
Dec. 31, 2011
Loss And LAE Reserves [Member]
Sep. 30, 2012
Second-Lien RMBS Reserves [Member]
Sep. 30, 2012
Recorded Recoveries [Member]
RMBS And HELOC And CES [Member]
Classified [Member]
Reviewed [Member]
Loss And Loss Adjustment Expense Reserves [Line Items]                          
ABS CDO exposure decrease since December 31,2007       88.00%                  
Aggregate ABS CDO Loss And LAE Reserves               $ 171,000,000 $ 242,000,000        
Policy holder Benefits And Claims Incurred Net 330,000,000   6,000,000                    
Elimination of loss and LAE expense as result of consolidating VIE     18,000,000                    
Excess interest cash flows from securitizations 185,000,000       80,000,000                
Reserves for expected future claim payments                   1,300,000,000 1,400,000,000    
Expected recoveries of future payments 395,000,000 562,000,000               395,000,000 562,000,000    
Paid losses and LAE, net of reinsurance and collections 489,000,000                     330,000,000  
Increase in insurance loss recoverable related to paid losses                       $ 270,000,000  
Number of insured issues reviewed           29 34            
Number of insured issues reviewed with recorded recoveries                         26
Number of transactions received consideration and excluded from loan files reviewed with potential recoveries 2                        
Weighted average risk-free rate used to discount claim liability 1.26%