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Fair Value Of Financial Instruments (Narrative) (Details) (USD $)
3 Months Ended9 Months Ended
Sep. 30, 2011
Sep. 30, 2010
Sep. 30, 2011
Sep. 30, 2010
Jun. 30, 2011
Dec. 31, 2010
Jun. 30, 2010
Dec. 31, 2009
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Gross par outstanding on insured derivatives$ 91,600,000,000 $ 91,600,000,000     
Financial guarantees, interest payments8,725,000,000[1] 8,725,000,000[1]  10,853,000,000[1]  
Percentage of sector-specific transactions valued using BET model7.00% 7.00%     
Percentage of transactions valued using corporate spreads used48.00% 48.00%     
Percentage of transactions valued using spread benchmarked from most relevant spread source45.00% 45.00%     
Percentage of transactions valued using WARF-sourced and/or ratings sourced credit spread91.00% 91.00%     
Net insured derivative liabilities4,900,000,000 4,900,000,000  4,400,000,000  
Impact of including nonperformance risk in valuation of pre-tax net insured derivative liability9,500,000,000 9,500,000,000  12,100,000,000  
Level 3 analysis, assets4,309,000,0004,651,000,0004,309,000,0004,651,000,0004,528,000,0004,467,000,0005,270,000,0001,627,000,000
Level 3 analysis, liabilities8,919,000,00010,871,000,0008,919,000,00010,871,000,00011,307,000,0009,916,000,0009,924,000,0003,900,000,000
Transfers into Level 3144,000,000323,000,000350,000,000720,000,000    
Transfers out of Level 377,000,000126,000,000354,000,000511,000,000    
Transfers into Level 277,000,000126,000,000354,000,000511,000,000    
Transfers out of Level 2144,000,000323,000,000350,000,000720,000,000    
Transfers in or out of Level 10 0  0  
Net unrealized losses related to the transfers into level 35,000,000 5,000,00013,000,000    
Net unrealized gains related to transfers into Level 3 15,000,000      
Net unrealized gains related to the transfers out of level 311,000,0001,00033,000,00045,000,000    
Interest Rate Contract [Member]
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Gross par outstanding on insured derivatives7,400,000,000 7,400,000,000     
Required Payment Of Lost Principal [Member] | CDS Contracts [Member]
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Gross par outstanding on insured derivatives65,500,000,000 65,500,000,000     
Required Interest Payments [Member] | CDS Contracts [Member]
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Gross par outstanding on insured derivatives18,700,000,000 18,700,000,000     
BET Valuation Model [Member]
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Percentage of insured credit derivatives fair valued using the BET model81.00% 81.00%     
Direct Price Model [Member]
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Percentage of insured credit derivatives value under direct price model19.00% 19.00%     
Corporate CDO [Member]
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Gross par outstanding on insured derivatives4,400,000,000 4,400,000,000     
CDS Contracts [Member]
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Gross par outstanding on insured derivatives84,200,000,000 84,200,000,000     
CMBS and Commercial Mortgage Collateral [Member]
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Gross par outstanding on insured derivatives$ 35,300,000,000 $ 35,300,000,000     
[1]Represents contractual principal and interest payments due by the issuer of the obligations insured by MBIA