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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, 2014
Dec. 31, 2013
Fair Value Off Balance Sheet Risks Disclosure Information [Line Items]    
Investments held-to-maturity, fair value $ 2,730 $ 2,651
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]    
Net cash collateral pledged   24 [1]
Total assets 0 24
Total liabilities 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]    
Accrued investment income 48 [1] 52 [1]
Receivable for investments sold 58 [1] 22 [1]
Total assets 106 74
Long-term debt 1,462 1,412
Payable for investments purchased 49 [2] 31 [2]
Total liabilities 1,550 1,443
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]    
Payable for loans purchased 39  
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 4 4
Total assets 2,734 2,655
Investment agreements 801 814
Medium-term notes 799 927
Total liabilities 4,437 4,492
Gross 4,619 2,843
Ceded 118 71
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]    
Investments held-to-maturity, fair value 2,730 2,651
Variable interest entity notes 2,837 2,751
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 4 5
Accrued investment income 48 [1] 52 [1]
Receivable for investments sold 58 [1] 22 [1]
Net cash collateral pledged   24 [1]
Total assets 2,882 2,904
Investment agreements 659 700
Medium-term notes 1,027 1,224
Long-term debt 1,784 1,702
Payable for investments purchased 49 [2] 31 [2]
Total liabilities 6,330 6,587
Gross 2,067 2,388
Ceded 68 76
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]    
Investments held-to-maturity, fair value 2,772 2,801
Variable interest entity notes 2,772 2,930
Payable for loans purchased 39  
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 4 4
Accrued investment income 48 [1] 52 [1]
Receivable for investments sold 58 [1] 22 [1]
Net cash collateral pledged   24 [1]
Total assets 2,840 2,753
Investment agreements 801 814
Medium-term notes 799 927
Long-term debt 1,462 1,412
Payable for investments purchased 49 [2] 31 [2]
Total liabilities 5,987 5,935
Gross 4,619 2,843
Ceded 118 71
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]    
Investments held-to-maturity, fair value 2,730 2,651
Variable interest entity notes 2,837 2,751
Payable for loans purchased $ 39  
[1]
Reported within "Other assets" on MBIA's consolidated balance sheets.
[2]
Reported within "Other liabilities" on MBIA's consolidated balance sheets.