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Debt (Narrative) (Detail) (USD $) | 0 Months Ended |  |  |  |  | 9 Months Ended | 0 Months Ended |  | 0 Months Ended | 3 Months Ended | 9 Months Ended | 0 Months Ended | 9 Months Ended |
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May 06, 2013 MBIA Inc Senior Notes [Member] | Sep. 30, 2013 MBIA Inc Senior Notes [Member] | Dec. 31, 2012 MBIA Inc Senior Notes [Member] | Sep. 30, 2013 MBIA Corp Surplus Notes [Member] | Dec. 31, 2012 MBIA Corp Surplus Notes [Member] | Sep. 30, 2013 Medium Term Notes [Member] Conduits [Member] | Sep. 30, 2013 Medium Term Notes [Member] Global Funding Limited [Member] | May 06, 2013 Bank Of America [Member] | Sep. 30, 2013 Mbia Inc [Member] | May 06, 2013 Blue Ridge [Member] | Sep. 30, 2013 Blue Ridge [Member] | Sep. 30, 2013 Blue Ridge [Member] | May 06, 2013 Blue Ridge [Member] Libor Rate Loans [Member] Applicable Margin [Member] | May 06, 2013 Blue Ridge [Member] Base Rate Loans [Member] Applicable Margin [Member] | May 06, 2013 Blue Ridge [Member] Base Rate Loans [Member] Federal Funds Rate Margin [Member] | May 06, 2013 Blue Ridge [Member] Base Rate Loans [Member] Adjusted Libor Rate Margin [Member] | May 06, 2013 Maximum [Member] Blue Ridge [Member] | Sep. 30, 2013 Maximum [Member] Blue Ridge [Member] | May 06, 2013 Minimum [Member] Blue Ridge [Member] | May 06, 2013 Fair Value [Member] Blue Ridge [Member]
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
14% Surplus Notes due 2033 |  |  |  | $ 940,000,000 | $ 940,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accrued interest |  | 10,000,000 | 9,000,000 | 143,000,000 | 61,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
MBIA debt coupon rate |  |  |  | 14.00% |  |  |  |  | 5.70% |  |  |  |  |  |  |  |  |  |  |
Long-term debt |  | 584,000,000 | 723,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount received on litigation settlement | 136,000,000 |  |  |  |  |  |  | 1,700,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Par value redeemed |  |  |  |  |  | 486,000,000 | 80,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average percent of par |  |  |  |  |  | 100.00% | 92.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit maximum amount |  |  |  |  |  |  |  |  |  | 500,000,000 |  |  |  |  |  |  |  |  |  |
Line of credit amount outstanding |  |  |  |  |  |  |  |  |  |  | 50,000,000 | 50,000,000 |  |  |  |  |  |  |  |
Line of credit interest rate |  |  |  |  |  |  |  |  |  |  | 7.76% |  | 7.50% | 6.50% | 0.50% | 1.00% |  |  |  |
General corporate purposes limit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 50,000,000 |  |  |
Liquidity requirements period |  |  |  |  |  |  |  |  |  | 0 years 0 months 30 days |  |  |  |  |  |  |  |  |  |
Equity interest collateral pledged percentage |  |  |  |  |  |  |  |  |  | 65.00% |  |  |  |  |  |  |  |  |  |
Secured line of credit collateral |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,000,000,000 | 2,500,000,000
Line of credit commitment fee percentage |  |  |  |  |  |  |  |  |  | 2.00% |  |  |  |  |  |  |  |  |  |
Line of credit interest and commitment fee |  |  |  |  |  |  |  |  |  |  |  | 4,000,000 |  |  |  |  |  |  |  |
Line of credit term |  |  |  |  |  |  |  |  |  | 3 years |  |  |  |  |  |  |  |  |  |
Putback recoveries collateral percentage |  |  |  |  |  |  |  |  |  | 100.00% |  |  |  |  |  |  |  |  |  |
Other prepayment collateral percentage after year one to year two |  |  |  |  |  |  |  |  |  | 50.00% |  |  |  |  |  |  |  |  |  |
Other prepayment collateral percentage after year two to year three |  |  |  |  |  |  |  |  |  | 100.00% |  |  |  |  |  |  |  |  |  |
Disposal of assets collateral percentage |  |  |  |  |  |  |  |  |  | 100.00% |  |  |  |  |  |  |  |  |  |
Disposal of assets maximum collateral |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,000,000 |  |  |
Liquidity borrowings repayment period |  |  |  |  |  |  |  |  |  | 0 years 0 months 30 days |  |  |  |  |  |  |  |  |  |
Minimum statutory capital required |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 750,000,000 |
Remediation efforts maximum amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 260,000,000 |  |
Remediation efforts loans outstanding maximum amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 200,000,000 |  |  |
Remediation efforts statutory capital reduction maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 100,000,000 |  |  |

X
- Definition Debt instruments repurchased weighted average percent of par value. + References No definition available. + Details
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Namespace Prefix: | mbi_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition The maximum amount of assets that can be disposed without requiring repayment of the secured loan. + References No definition available. + Details
Name: | mbi_DisposalOfAssetsCollateralMaximum
Namespace Prefix: | mbi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The mandatory percentage of proceeds from disposals of assets required to repay the secured loan. + References No definition available. + Details
Name: | mbi_DisposalOfAssetsCollateralPercentage
Namespace Prefix: | mbi_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition The secured loan limit that can be used for general corporate purposes. + References No definition available. + Details
Name: | mbi_GeneralCorporatePurposesProceedsLimit
Namespace Prefix: | mbi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The amount of interest and commitment fee incurred for the period. + References No definition available. + Details
Name: | mbi_LineOfCreditFacilityInterestAndCommitmentFeeAmount
Namespace Prefix: | mbi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The period in which liquidity borrowings on the secured loan must be repaid if in fact the borrowings are not used for such purposes. + References No definition available. + Details
Name: | mbi_LiquidityBorrowingsRepaymentPeriod
Namespace Prefix: | mbi_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition The period of projected ordinary course liquidity requirements that secured loan proceeds must be used for after meeting the general corporate purposes limit. + References No definition available. + Details
Name: | mbi_LiquidityRequirementsPeriod
Namespace Prefix: | mbi_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition This element represents the minimum statutory requirement required under the secured loan. + References No definition available. + Details
Name: | mbi_MinimumStatutoryCapitalRequirement
Namespace Prefix: | mbi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The mandatory percentage of proceeds from other prepayment collateral required to repay the secured loan after year one to year two. + References No definition available. + Details
Name: | mbi_OtherPrepaymentCollateralPercentageAfterYearOneToYearTwo
Namespace Prefix: | mbi_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition The mandatory percentage of proceeds from other prepayment collateral required to repay the secured loan after year two to year three. + References No definition available. + Details
Name: | mbi_OtherPrepaymentCollateralPercentageAfterYearTwoToYearThree
Namespace Prefix: | mbi_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition The mandatory percentage of proceeds from put-back recoveries required to repay the secured loan. + References No definition available. + Details
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Namespace Prefix: | mbi_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition The maximum amount of secured loans outstanding with regard to remediation efforts without consent. + References No definition available. + Details
Name: | mbi_RemediationEffortsLoansOutstandingMaximumAmount
Namespace Prefix: | mbi_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | duration

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- Definition Maximum amount of remediation efforts with respect to insurance obligations and settlements of litigation that can be entered into without requiring consent. + References No definition available. + Details
Name: | mbi_RemediationEffortsMaximumAmount
Namespace Prefix: | mbi_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | duration

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- Definition The maximum amount statutory capital can decline due to remediation efforts without consent. + References No definition available. + Details
Name: | mbi_RemediationEffortsStatutoryCapitalReductionMaximum
Namespace Prefix: | mbi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The collateral required under terms of the line of credit agreement. + References No definition available. + Details
Name: | mbi_SecuredLineOfCreditCollateral
Namespace Prefix: | mbi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Term of secured revolving credit agreement. + References No definition available. + Details
Name: | mbi_SecuredRevolvingCreditAgreementTerm
Namespace Prefix: | mbi_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition This element represents the percentage of the Company's equity interest in a subsidiary that is pledged as collateral. + References No definition available. + Details
Name: | mbi_SubsidiaryCollateralPercentage
Namespace Prefix: | mbi_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Amount of long-term debt before deduction of unamortized discount or premium. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, with initial maturities beyond one year or the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Details
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Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Face (par) amount of the original debt instrument that was repurchased. + References No definition available. + Details
Name: | us-gaap_DebtInstrumentRepurchasedFaceAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Amount of interest payable on debt, including, but not limited to, trade payables. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.15(5)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.15(a)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 15 -Subparagraph a -Article 7 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 15 -Subparagraph 5 -Article 9 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Amount borrowed under the credit facility as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
Name: | us-gaap_LineOfCreditFacilityAmountOutstanding
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The effective interest rate during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Cash received for the settlement of litigation during the current period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3536-108585 + Details
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Balance Type: | debit
Period Type: | duration

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- Definition Financial instruments issued by insurance entities (surplus notes) that are includable in surplus for statutory accounting purposes as prescribed or permitted by state laws and regulations that are liabilities of the issuer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 470 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6486086&loc=d3e24387-158525 + Details
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Namespace Prefix: | us-gaap_
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