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Debt (Principal Payments For Investment Agreements, MTNs and VIE Obligations) (Detail) (USD $) In Millions, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Debt Instrument [Line Items] |  |  |
Total expected principal payments | $ 592 us-gaap_DebtInstrumentCarryingAmount |  | $ 592 us-gaap_DebtInstrumentCarryingAmount
Investment Agreement Obligations [Member] |  |  |
Debt Instrument [Line Items] |  |  |
2015 | 39 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths / us-gaap_DebtInstrumentAxis = mbi_InvestmentAgreementObligationsMember |  |
2016 | 40 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo / us-gaap_DebtInstrumentAxis = mbi_InvestmentAgreementObligationsMember |  |
2017 | 56 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree / us-gaap_DebtInstrumentAxis = mbi_InvestmentAgreementObligationsMember |  |
2018 | 17 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour / us-gaap_DebtInstrumentAxis = mbi_InvestmentAgreementObligationsMember |  |
2019 | 8 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive / us-gaap_DebtInstrumentAxis = mbi_InvestmentAgreementObligationsMember |  |
Thereafter | 455 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive / us-gaap_DebtInstrumentAxis = mbi_InvestmentAgreementObligationsMember |  |
Total expected principal payments | 615 us-gaap_DebtInstrumentCarryingAmount / us-gaap_DebtInstrumentAxis = mbi_InvestmentAgreementObligationsMember | [1] |
Less discount and other adjustments | 68 mbi_DiscountsNetOfFairValueAdjustmentsAndAccruedInterest / us-gaap_DebtInstrumentAxis = mbi_InvestmentAgreementObligationsMember |  |
Total | 547 us-gaap_BorrowingsUnderGuaranteedInvestmentAgreements / us-gaap_DebtInstrumentAxis = mbi_InvestmentAgreementObligationsMember |  |
Less unamortized discount | 75 us-gaap_DebtInstrumentUnamortizedDiscount / us-gaap_DebtInstrumentAxis = mbi_InvestmentAgreementObligationsMember |  |
Accrued interest | 7 us-gaap_InterestPayableCurrentAndNoncurrent / us-gaap_DebtInstrumentAxis = mbi_InvestmentAgreementObligationsMember |  |
Medium Term Notes [Member] |  |  |
Debt Instrument [Line Items] |  |  |
2015 | 102 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths / us-gaap_DebtInstrumentAxis = us-gaap_MediumTermNotesMember |  |
2016 | 119 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo / us-gaap_DebtInstrumentAxis = us-gaap_MediumTermNotesMember |  |
2017 | 53 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree / us-gaap_DebtInstrumentAxis = us-gaap_MediumTermNotesMember |  |
2018 | 59 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour / us-gaap_DebtInstrumentAxis = us-gaap_MediumTermNotesMember |  |
2019 | 61 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive / us-gaap_DebtInstrumentAxis = us-gaap_MediumTermNotesMember |  |
Thereafter | 1,152 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive / us-gaap_DebtInstrumentAxis = us-gaap_MediumTermNotesMember |  |
Total expected principal payments | 1,546 us-gaap_DebtInstrumentCarryingAmount / us-gaap_DebtInstrumentAxis = us-gaap_MediumTermNotesMember | [2] |
Less discount and other adjustments | 345 mbi_DiscountsNetOfFairValueAdjustmentsAndAccruedInterest / us-gaap_DebtInstrumentAxis = us-gaap_MediumTermNotesMember |  |
Total | 1,201 us-gaap_BorrowingsUnderGuaranteedInvestmentAgreements / us-gaap_DebtInstrumentAxis = us-gaap_MediumTermNotesMember |  |
Less unamortized discount | 306 us-gaap_DebtInstrumentUnamortizedDiscount / us-gaap_DebtInstrumentAxis = us-gaap_MediumTermNotesMember |  |
Fair value adjustments | 45 mbi_DebtInstrumentFairValueAdjustment / us-gaap_DebtInstrumentAxis = us-gaap_MediumTermNotesMember |  |
Accrued interest | 6 us-gaap_InterestPayableCurrentAndNoncurrent / us-gaap_DebtInstrumentAxis = us-gaap_MediumTermNotesMember |  |
Variable Interest Entity Debt [Member] | International And Structured Finance Insurance [Member] |  |  |
Debt Instrument [Line Items] |  |  |
2015 | 471 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths / us-gaap_DebtInstrumentAxis = mbi_VariableInterestEntityDebtMember / us-gaap_StatementBusinessSegmentsAxis = mbi_StructuredFinanceAndInternationalInsuranceMember |  |
2016 | 336 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo / us-gaap_DebtInstrumentAxis = mbi_VariableInterestEntityDebtMember / us-gaap_StatementBusinessSegmentsAxis = mbi_StructuredFinanceAndInternationalInsuranceMember |  |
2017 | 346 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree / us-gaap_DebtInstrumentAxis = mbi_VariableInterestEntityDebtMember / us-gaap_StatementBusinessSegmentsAxis = mbi_StructuredFinanceAndInternationalInsuranceMember |  |
2018 | 321 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour / us-gaap_DebtInstrumentAxis = mbi_VariableInterestEntityDebtMember / us-gaap_StatementBusinessSegmentsAxis = mbi_StructuredFinanceAndInternationalInsuranceMember |  |
2019 | 299 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive / us-gaap_DebtInstrumentAxis = mbi_VariableInterestEntityDebtMember / us-gaap_StatementBusinessSegmentsAxis = mbi_StructuredFinanceAndInternationalInsuranceMember |  |
Thereafter | 3,031 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive / us-gaap_DebtInstrumentAxis = mbi_VariableInterestEntityDebtMember / us-gaap_StatementBusinessSegmentsAxis = mbi_StructuredFinanceAndInternationalInsuranceMember |  |
Total expected principal payments | 4,804 us-gaap_DebtInstrumentCarryingAmount / us-gaap_DebtInstrumentAxis = mbi_VariableInterestEntityDebtMember / us-gaap_StatementBusinessSegmentsAxis = mbi_StructuredFinanceAndInternationalInsuranceMember | [3] |
Net fair value | $ 2,000 us-gaap_DebtInstrumentFairValue / us-gaap_DebtInstrumentAxis = mbi_VariableInterestEntityDebtMember / us-gaap_StatementBusinessSegmentsAxis = mbi_StructuredFinanceAndInternationalInsuranceMember |  |
[1] | Amounts reflect principal due at maturity for presented in investment agreements issued at a discount.
[2] | Amounts reflect principal due at maturity for notes issued at a discount or premium.
[3] | Includes $2.0 billion of VIE notes accounted for at fair value as of December 31, 2014.

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