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Loss And Loss Adjustment Expense Reserves (Loss And LAE Activity) (Narrative) (Detail) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Loss And Loss Adjustment Expense Reserves [Line Items]          
Policyholder (Benefits) And Claims Incurred Net $ 39 $ 20 $ 79 $ 82  
Weighted average risk-free rate used to discount claim liability 1.56%        
Insurance loss recoverable $ 437   437   $ 533
CDO Portfolio [Member]          
Loss And Loss Adjustment Expense Reserves [Line Items]          
Policyholder (Benefits) And Claims Incurred Net 5   39    
CDO Portfolio [Member] | Variable Interest Entity Primary Beneficiary [Member]          
Loss And Loss Adjustment Expense Reserves [Line Items]          
Elimination Of Loss And LAE Expense (Benefit) As Result Of Consolidating VIEs 14   1    
Second Lien Residential Mortgage Backed Securities And Reserves [Member]          
Loss And Loss Adjustment Expense Reserves [Line Items]          
Policyholder (Benefits) And Claims Incurred Net 24 16 52 88  
First Lien Residential Mortgage Backed Securities [Member]          
Loss And Loss Adjustment Expense Reserves [Line Items]          
Policyholder (Benefits) And Claims Incurred Net 18 12 2 39  
Financial Guarantee [Member]          
Loss And Loss Adjustment Expense Reserves [Line Items]          
Aggregate CDO Loss And LAE Reserves 149   149   111
Financial Guarantee [Member] | CDO Portfolio [Member] | Variable Interest Entity Primary Beneficiary [Member]          
Loss And Loss Adjustment Expense Reserves [Line Items]          
Elimination Of Loss And Lae Reserves As Result Of Consolidating VIEs 226   226   225
Loss And Lae Reserves [Member]          
Loss And Loss Adjustment Expense Reserves [Line Items]          
Reserves for expected future claim payments 700   700   653
Expected recoveries of future payments 220   220   147
Recoveries On Unpaid Losses [Member]          
Loss And Loss Adjustment Expense Reserves [Line Items]          
Expected recoveries of future payments 220   220   147
Insurance Loss Recoverable [Member] | Classified [Member]          
Loss And Loss Adjustment Expense Reserves [Line Items]          
Insurance claim loss recoverable 437   437   533
Insurance loss recoverable 437   437   533
Loan Repurchase Commitments [Member] | Second Lien Residential Mortgage Backed Securities And Reserves [Member] | Ineligible Loan Recoveries [Member]          
Loss And Loss Adjustment Expense Reserves [Line Items]          
Total estimated insurance recoveries 394   394   $ 379
Remedial Actions For Insured Obligations [Member]          
Loss And Loss Adjustment Expense Reserves [Line Items]          
Policyholder (Benefits) And Claims Incurred Net $ 5 $ 3 $ 10 $ 37