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Loss And Loss Adjustment Expense Reserves (Schedule Of Company's Second-Lien RMBS Exposure, Gross Undiscounted Claim Liability And Potential Recoveries, Before The Elimination Of Amounts Related To Consolidated VIE's) (Detail) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Loss And Loss Adjustment Expense Reserves [Line Items]    
Outstanding Gross Principal $ 12,424 [1] $ 14,264 [1]
Gross Interest 7,270 [1] 8,632 [1]
Gross Undiscounted Claim Liability 841 1,235
Potential Recoveries 798 1,085
Insured Issues Designated As Classified List [Member] | Non Variable Interest Entities [Member]
    
Loss And Loss Adjustment Expense Reserves [Line Items]    
Issues 24  
Outstanding Gross Principal 3,100  
Gross Interest 1,000  
Gross Undiscounted Claim Liability 100  
Potential Recoveries 600  
Insured Issues Designated As Classified List [Member] | Variable Interest Entity Primary Beneficiary [Member]
    
Loss And Loss Adjustment Expense Reserves [Line Items]    
Issues 11  
Outstanding Gross Principal 1,500  
Gross Interest 500  
Gross Undiscounted Claim Liability 0  
Potential Recoveries $ 500  
[1]
Represents contractual principal and interest payments due by the issuer of the obligations insured by MBIA.