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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, 2013
Dec. 31, 2012
Loss And Loss Adjustment Expense Reserves [Line Items]    
Outstanding Gross Principal $ 15,182 [1] $ 15,257 [1]
Gross Interest 9,128 [1] 8,361 [1]
Gross Undiscounted Claim Liability 1,504 1,589
Potential Recoveries 1,264 4,109
Insured Issues Designated As Classified List [Member] | Non Variable Interest Entities [Member]
    
Loss And Loss Adjustment Expense Reserves [Line Items]    
Issues 23  
Outstanding Gross Principal 3,600  
Gross Interest 1,300  
Gross Undiscounted Claim Liability 200  
Potential Recoveries 900  
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 1,800  
Gross Interest 700  
Gross Undiscounted Claim Liability 100  
Potential Recoveries $ 1,400  
[1] Represents contractual principal and interest payments due by the issuer of the obligations insured by MBIA.