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Loss And Loss Adjustment Expense Reserves (RMBS Reserves) (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]          
Insurance loss recoverable $ 437   $ 437   $ 533
Schedule Of Insured Financial Obligations With Credit Deterioration Insured Contractual Payments Outstanding Principal [1] 12,741   12,741   11,263
Policyholder (Benefits) And Claims Incurred Net 39 $ 20 79 $ 82  
Contract claims on ineligible mortgage loans inception to date, incurred loss on transactions 424   424    
Loss And Lae Reserves [Member]          
Loss And Loss Adjustment Expense Reserves [Line Items]          
Loss and loss adjustment expense reserves 480   480   506
Expected recoveries of future payments 220   220   147
First Lien R M B S Reserves [Member] | Loss And Lae Reserves [Member]          
Loss And Loss Adjustment Expense Reserves [Line Items]          
Loss and loss adjustment expense reserves 246   246   263
Second Lien Rmbs And Heloc And Ces [Member]          
Loss And Loss Adjustment Expense Reserves [Line Items]          
Addition to case basis reserves if losses remain at peak levels 32        
Second Lien Rmbs And Heloc And Ces [Member] | Excess Spread [Member]          
Loss And Loss Adjustment Expense Reserves [Line Items]          
Insurance loss recoverable 398   398   496
Total excess spread recoveries 411   411   523
Expected recoveries of future payments 13   13   27
Second Lien Rmbs And Heloc And Ces [Member] | Excess Spread [Member] | Variable Interest Entity Primary Beneficiary [Member]          
Loss And Loss Adjustment Expense Reserves [Line Items]          
Insurance loss recoverable 96   96   132
Total excess spread recoveries 99   99   137
Expected recoveries of future payments 3   3   5
U S Public Finance Insurance [Member]          
Loss And Loss Adjustment Expense Reserves [Line Items]          
Loss and loss adjustment expense reserves 31   31   45
Insurance loss recoverable         4
Policyholder (Benefits) And Claims Incurred Net (7) $ (8) (5) $ (5)  
U S Public Finance Insurance [Member] | General obligations          
Loss And Loss Adjustment Expense Reserves [Line Items]          
Schedule Of Insured Financial Obligations With Credit Deterioration Insured Contractual Payments Outstanding Principal 76,600   76,600   98,900
U S Public Finance Insurance [Member] | General obligations | Classified [Member]          
Loss And Loss Adjustment Expense Reserves [Line Items]          
Schedule Of Insured Financial Obligations With Credit Deterioration Insured Contractual Payments Outstanding Principal 79   79   152
Second Lien R M B S Securitizations [Member] | Loss And Lae Reserves [Member]          
Loss And Loss Adjustment Expense Reserves [Line Items]          
Loss and loss adjustment expense reserves 47   47   70
Second Lien R M B S Securitizations [Member] | Variable Interest Entity Primary Beneficiary [Member]          
Loss And Loss Adjustment Expense Reserves [Line Items]          
Loss and loss adjustment expense reserves $ 22   $ 22   $ 21
[1] Represents contractual principal and interest payments due by the issuer of the obligations insured by MBIA.