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Fair Value Of Financial Instruments (Fair Value Hierarchy Table Presents The Company's Assets And Liabilities At Fair Value Not Recorded On The Company's Consolidated Balance Sheet) (Detail) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Fair Value Off Balance Sheet Risks Disclosure Information [Line Items]    
Investments held-to-maturity, fair value $ 2,566 $ 2,674
Value Disclosed At Fair Value Not Recorded At Fair Value [Member] | Fair Value Inputs Level 1 [Member]
    
Fair Value Off Balance Sheet Risks Disclosure Information [Line Items]    
Other investments 0 0
Accrued investment income 44 [1] 43 [1]
Receivable for investments sold 23 [1] 17 [1]
Net cash collateral pledged 62 [1] 66 [1]
Total assets 129 126
Investment agreements 0 0
Medium-term notes 0 0
Securities Loaned Or Sold Under Agreements To Repurchase 0 0
Long-term debt 10 9
Payable for investments purchased 150 [2] 50 [2]
Secured loan 0 [3]  
Total liabilities 160 59
Gross 0 0
Ceded 0 0
Value Disclosed At Fair Value Not Recorded At Fair Value [Member] | Fair Value Inputs Level 1 [Member] | Variable Interest Entity Primary Beneficiary [Member]
    
Fair Value Off Balance Sheet Risks Disclosure Information [Line Items]    
Variable interest entity notes 0 0
Investments held-to-maturity, fair value 0 0
Value Disclosed At Fair Value Not Recorded At Fair Value [Member] | Fair Value Inputs Level 2 [Member]
    
Fair Value Off Balance Sheet Risks Disclosure Information [Line Items]    
Other investments 0 0
Accrued investment income 0 [1] 0 [1]
Receivable for investments sold 0 [1] 0 [1]
Net cash collateral pledged 0 [1] 0 [1]
Total assets 0 0
Investment agreements 0 0
Medium-term notes 0 0
Securities Loaned Or Sold Under Agreements To Repurchase 0 0
Long-term debt 1,282 702
Payable for investments purchased 0 [2] 0 [2]
Secured loan 0 [3]  
Total liabilities 1,282 702
Gross 0 0
Ceded 0 0
Value Disclosed At Fair Value Not Recorded At Fair Value [Member] | Fair Value Inputs Level 2 [Member] | Variable Interest Entity Primary Beneficiary [Member]
    
Fair Value Off Balance Sheet Risks Disclosure Information [Line Items]    
Variable interest entity notes 0 0
Investments held-to-maturity, fair value 0 0
Value Disclosed At Fair Value Not Recorded At Fair Value [Member] | Fair Value Inputs Level 3 [Member]
    
Fair Value Off Balance Sheet Risks Disclosure Information [Line Items]    
Other investments 6 9
Accrued investment income 0 [1] 0 [1]
Receivable for investments sold 0 [1] 0 [1]
Net cash collateral pledged 0 [1] 0 [1]
Total assets 2,572 2,683
Investment agreements 902 1,175
Medium-term notes 1,035 860
Securities Loaned Or Sold Under Agreements To Repurchase 0 0
Long-term debt 0 0
Payable for investments purchased 0 [2] 0 [2]
Secured loan 50 [3]  
Total liabilities 4,676 5,182
Gross 3,097 650
Ceded 69 97
Value Disclosed At Fair Value Not Recorded At Fair Value [Member] | Fair Value Inputs Level 3 [Member] | Variable Interest Entity Primary Beneficiary [Member]
    
Fair Value Off Balance Sheet Risks Disclosure Information [Line Items]    
Variable interest entity notes 2,689 3,147
Investments held-to-maturity, fair value 2,566 2,674
Carrying Reported Amount Fair Value Disclosure [Member] | Value Disclosed At Fair Value Not Recorded At Fair Value [Member]
    
Fair Value Off Balance Sheet Risks Disclosure Information [Line Items]    
Other investments 6 9
Accrued investment income 44 [1] 43 [1]
Receivable for investments sold 23 [1] 17 [1]
Net cash collateral pledged 62 [1] 66 [1]
Total assets 2,944 2,964
Investment agreements 760 944
Medium-term notes 1,350 1,433
Securities Loaned Or Sold Under Agreements To Repurchase 0 0
Long-term debt 1,677 1,732
Payable for investments purchased 150 [2] 50 [2]
Secured loan 50 [3]  
Total liabilities 6,946 7,624
Gross 2,490 143
Ceded 77 91
Carrying Reported Amount Fair Value Disclosure [Member] | Value Disclosed At Fair Value Not Recorded At Fair Value [Member] | Variable Interest Entity Primary Beneficiary [Member]
    
Fair Value Off Balance Sheet Risks Disclosure Information [Line Items]    
Variable interest entity notes 2,959 3,465
Investments held-to-maturity, fair value 2,809 2,829
Fair Value [Member] | Value Disclosed At Fair Value Not Recorded At Fair Value [Member]
    
Fair Value Off Balance Sheet Risks Disclosure Information [Line Items]    
Other investments 6 9
Accrued investment income 44 [1] 43 [1]
Receivable for investments sold 23 [1] 17 [1]
Net cash collateral pledged 62 [1] 66 [1]
Total assets 2,701 2,809
Investment agreements 902 1,175
Medium-term notes 1,035 860
Securities Loaned Or Sold Under Agreements To Repurchase 0 0
Long-term debt 1,292 711
Payable for investments purchased 150 [2] 50 [2]
Secured loan 50 [3]  
Total liabilities 6,118 5,943
Gross 3,097 650
Ceded 69 97
Fair Value [Member] | Value Disclosed At Fair Value Not Recorded At Fair Value [Member] | Variable Interest Entity Primary Beneficiary [Member]
    
Fair Value Off Balance Sheet Risks Disclosure Information [Line Items]    
Variable interest entity notes 2,689 3,147
Investments held-to-maturity, fair value $ 2,566 $ 2,674
[1] Reported within "Other assets" on MBIA's consolidated balance sheets.
[2] Reported within "Other liabilities" on MBIA's consolidated balance sheets.
[3] Unobservable inputs are either not developed by the Company or do not significantly impact the overall fair values of the aggregate financial assets and liabilities.