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Debt (Narrative) (Detail) (USD $) | 0 Months Ended | 6 Months Ended
--- | --- | ---
May 06, 2013 | Jun. 30, 2013
Bank Of America [Member] |  |
Debt Instrument [Line Items] |  |
Amount received on litigation settlement | $ 1,700,000,000 |
Line of credit maximum amount | 500,000,000 |
Liquidity requirements period | 0 years 0 months 30 days |
Equity interest collateral pledged percentage | 65.00% |
Line of credit commitment fee percentage | 2.00% |
Line of credit commitment fee | 1,000,000 |
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% |
Liquidity borrowings repayment period | 0 years 0 months 30 days |
Minimum statutory capital required | 750,000,000 |
Bank Of America [Member] | Libor Rate Loans [Member] | Applicable Margin [Member] |  |
Debt Instrument [Line Items] |  |
Line of credit interest rate | 7.50% |
Bank Of America [Member] | Base Rate Loans [Member] | Applicable Margin [Member] |  |
Debt Instrument [Line Items] |  |
Line of credit interest rate | 6.50% |
Bank Of America [Member] | Base Rate Loans [Member] | Federal Funds Rate Margin [Member] |  |
Debt Instrument [Line Items] |  |
Line of credit interest rate | 0.50% |
Bank Of America [Member] | Base Rate Loans [Member] | Adjusted Libor Rate Margin [Member] |  |
Debt Instrument [Line Items] |  |
Line of credit interest rate | 1.00% |
Mbia Inc [Member] |  |
Debt Instrument [Line Items] |  |
MBIA debt coupon rate |  | 5.70%
Maximum [Member] | Bank Of America [Member] |  |
Debt Instrument [Line Items] |  |
General corporate purposes limit | 50,000,000 |
Disposal of assets maximum collateral | 1,000,000 |
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 |
Minimum [Member] | Bank Of America [Member] |  |
Debt Instrument [Line Items] |  |
Secured line of credit collateral | 1,000,000,000 |
Fair Value [Member] | Bank Of America [Member] |  |
Debt Instrument [Line Items] |  |
Secured line of credit collateral | 2,500,000,000 |
Corporate Obligations [Member] | Bank Of America [Member] |  |
Debt Instrument [Line Items] |  |
Amount received on litigation settlement | 136,000,000 |
MBIA Inc Senior Notes Due 2034 [Member] | Mbia Inc [Member] |  |
Debt Instrument [Line Items] |  |
MBIA debt coupon rate |  | 5.70%
MBIA Corp Surplus Notes Due 2033 [Member] | Mbia Corp [Member] |  |
Debt Instrument [Line Items] |  |
MBIA debt coupon rate |  | 14.00%
Accrued interest on surplus notes |  | 117,000,000
Medium Term Notes [Member] | Conduits [Member] |  |
Debt Instrument [Line Items] |  |
Par value redeemed |  | 336,000,000
Weighted average percent of par |  | 100.00%
Medium Term Notes [Member] | Global Funding Limited [Member] |  |
Debt Instrument [Line Items] |  |
Par value redeemed |  | $ 38,000,000
Weighted average percent of par |  | 97.00%

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

X
- 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 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

X
- 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

X
- 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
Name: | mbi_PutbackRecoveriesCollateralPercentage
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

X
- 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

X
- 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

X
- 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

X
- 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

X
- 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 Interest rate stated in the contractual 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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Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Details
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Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- 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

X
- Definition Carrying value as of the balance sheet date of [accrued] interest payable on all forms of debt, including trade payables, that has been incurred and is unpaid. + 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

X
- Definition Amount of the fee for available but unused credit capacity under the credit 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: | debit
Period Type: | duration

X
- 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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Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- 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 Statement of Financial Accounting Standard (FAS) -Number 129 -Paragraph 2, 4 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. 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 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: 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

X
- 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

X
- 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 Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 27 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: 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=6943989&loc=d3e3536-108585 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration