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v2.4.1.9

Debt (Narrative) (Detail) (USD $) In Millions, unless otherwise specified | 12 Months Ended |
--- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Jan. 16, 2008
Debt Instrument [Line Items] |  |  |  |  |
Aggregate principal amount in excess of stated amount | 10 mbi_AggregatePrincipalAmountInExcessOfFailuretoMakePaymentAtMaturity |  |  |  |
Surplus notes outstanding | 940 us-gaap_SurplusNotes | [1] | 940 us-gaap_SurplusNotes | [1] | 1,000 us-gaap_SurplusNotes
Surplus notes purchased at par value | 13 mbi_SurplusNotesAtParValueOwnedByCorporateSegment |  |  |  |
Senior notes at par value owned by National | 136 mbi_SeniorNotesAtParValueOwnedByNational |  |  |  |
Surplus notes repurchased at outstanding par value | 47 mbi_SurplusNotesRepurchasedAtOutstandingParValue |  |  |  |
Surplus notes, weighted average price per unit | 77.08 mbi_SurplusNotesWeightedAveragePricePerUnit |  |  |  |
Long-term debt | 592 us-gaap_DebtInstrumentCarryingAmount |  | 592 us-gaap_DebtInstrumentCarryingAmount |  |
MBIA Inc Senior Notes [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Accrued interest | 8 us-gaap_InterestPayableCurrentAndNoncurrent / us-gaap_DebtInstrumentAxis = mbi_MbiaIncSeniorNotesMember |  | 8 us-gaap_InterestPayableCurrentAndNoncurrent / us-gaap_DebtInstrumentAxis = mbi_MbiaIncSeniorNotesMember |  |
MBIA Corp Surplus Notes [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term debt, interest rate | 14.00%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = mbi_MbiaCorpSurplusNotesMember |  |  |  |
Interest rate terms | interest rate of 14% until January 15, 2013 and thereafter have an interest rate of three-month LIBOR plus 11.26% |  |  |  |
Debt instrument, base reference rate | three-month LIBOR |  |  |  |
Debt instrument, basis spread on variable rate | 11.26%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_DebtInstrumentAxis = mbi_MbiaCorpSurplusNotesMember |  |  |  |
Medium Term Notes [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Annual interest rates, minimum | 0.00%us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMinimum / us-gaap_CreditFacilityAxis = us-gaap_MediumTermNotesMember |  | 0.00%us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMinimum / us-gaap_CreditFacilityAxis = us-gaap_MediumTermNotesMember |  |
Annual interest rates, maximum | 9.08%us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMaximum / us-gaap_CreditFacilityAxis = us-gaap_MediumTermNotesMember |  | 8.93%us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMaximum / us-gaap_CreditFacilityAxis = us-gaap_MediumTermNotesMember |  |
Weighted average interest rate | 2.44%us-gaap_DebtWeightedAverageInterestRate / us-gaap_CreditFacilityAxis = us-gaap_MediumTermNotesMember |  | 2.67%us-gaap_DebtWeightedAverageInterestRate / us-gaap_CreditFacilityAxis = us-gaap_MediumTermNotesMember |  |
Medium Term Notes [Member] | Conduits [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Par value redeemed | 129 us-gaap_DebtInstrumentRepurchasedFaceAmount / us-gaap_CreditFacilityAxis = us-gaap_MediumTermNotesMember / us-gaap_ProductOrServiceAxis = mbi_ConduitsMember |  |  |  |
Weighted average percent of par | 97.00%mbi_DebtInstrumentRepurchasedPercentOfParValue / us-gaap_CreditFacilityAxis = us-gaap_MediumTermNotesMember / us-gaap_ProductOrServiceAxis = mbi_ConduitsMember |  |  |  |
Medium Term Notes [Member] | Global Funding Limited [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Par value redeemed | 122 us-gaap_DebtInstrumentRepurchasedFaceAmount / us-gaap_CreditFacilityAxis = us-gaap_MediumTermNotesMember / us-gaap_ProductOrServiceAxis = mbi_GlobalFundingLimitedMember |  |  |  |
Weighted average percent of par | 98.00%mbi_DebtInstrumentRepurchasedPercentOfParValue / us-gaap_CreditFacilityAxis = us-gaap_MediumTermNotesMember / us-gaap_ProductOrServiceAxis = mbi_GlobalFundingLimitedMember |  |  |  |
Investment Agreement Obligations [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Annual interest rates, minimum | 3.48%us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMinimum / us-gaap_CreditFacilityAxis = mbi_InvestmentAgreementObligationsMember |  | 0.21%us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMinimum / us-gaap_CreditFacilityAxis = mbi_InvestmentAgreementObligationsMember |  |
Annual interest rates, maximum | 7.38%us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMaximum / us-gaap_CreditFacilityAxis = mbi_InvestmentAgreementObligationsMember |  | 7.38%us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMaximum / us-gaap_CreditFacilityAxis = mbi_InvestmentAgreementObligationsMember |  |
Weighted average interest rate | 5.50%us-gaap_DebtWeightedAverageInterestRate / us-gaap_CreditFacilityAxis = mbi_InvestmentAgreementObligationsMember |  | 5.10%us-gaap_DebtWeightedAverageInterestRate / us-gaap_CreditFacilityAxis = mbi_InvestmentAgreementObligationsMember |  |
[1] | Callable on or after January 15, 2018 and every fifth anniversary thereafter at 100.00.

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- Definition Debt instruments repurchased weighted average percent of par value. + References No definition available. + Details
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- Definition Par value of MBIA Inc. senior notes owned by National as of the balance sheet date. + References No definition available. + Details
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- 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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- Definition Description of the interest rate as being fixed or variable, and, if variable, identification of the index or rate on which the interest rate is based and the number of points or percentage added to that index or rate to set the rate, and other pertinent information, such as frequency of rate resets. + 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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