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Loss And Loss Adjustment Expense Reserves (RMBS Reserves) (Narrative) (Detail) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2015
Loss And Loss Adjustment Expense Reserves [Line Items]      
Insurance loss recoverable $ 409   $ 577
Schedule Of Insured Financial Obligations With Credit Deterioration Insured Contractual Payments Outstanding Principal [1] 10,948   11,160
Policyholder (Benefits) And Claims Incurred Net 22 $ (6)  
Total excess spread recoveries 407   571
Contract claims on ineligible mortgage loans inception to date, incurred loss on transactions 427    
Loss And Lae Reserves [Member]      
Loss And Loss Adjustment Expense Reserves [Line Items]      
Loss and loss adjustment expense reserves 525   516
Expected recoveries of future payments 101   100
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 297   277
First Lien R M B S Reserves [Member] | Variable Interest Entity Primary Beneficiary [Member] | Loss And Lae Reserves [Member]      
Loss And Loss Adjustment Expense Reserves [Line Items]      
Loss and loss adjustment expense reserves 5   5
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 29    
Second Lien Rmbs And Heloc And Ces [Member] | Excess Spread [Member]      
Loss And Loss Adjustment Expense Reserves [Line Items]      
Insurance loss recoverable 363   382
Total excess spread recoveries 465   499
Expected recoveries of future payments 18   24
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 81   87
Total excess spread recoveries 84   93
Expected recoveries of future payments 3   6
U S Public Finance Insurance [Member]      
Loss And Loss Adjustment Expense Reserves [Line Items]      
Loss and loss adjustment expense reserves 52   45
Insurance loss recoverable 3   4
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 65,400   70,000
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 1,100   79
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 57   51
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 $ 17   $ 16
[1] Represents contractual principal and interest payments due by the issuer of the obligations insured by MBIA.