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Schedule II (Condensed Statements Of Operations) (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Condensed Income Statements, Captions [Line Items]
Net gains (losses) on financial instruments at fair value and foreign exchange	$ 78mbi_NetGainsLossesOnFinancialInstrumentsAtFairValueAndForeignExchange	$ 69mbi_NetGainsLossesOnFinancialInstrumentsAtFairValueAndForeignExchange	$ 55mbi_NetGainsLossesOnFinancialInstrumentsAtFairValueAndForeignExchange
Investment losses related to other-than-temporary impairments:
Net investment losses related to other-than-temporary impairments	(15)us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNet		(105)us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNet
Net gains (losses) on extinguishment of debt	3us-gaap_GainsLossesOnExtinguishmentOfDebt	60us-gaap_GainsLossesOnExtinguishmentOfDebt
Other net realized gains (losses)	28us-gaap_OtherIncome	(29)us-gaap_OtherIncome	7us-gaap_OtherIncome
Total revenues	1,270us-gaap_Revenues	1,209us-gaap_Revenues	2,435us-gaap_Revenues
Interest	210us-gaap_InterestExpense	236us-gaap_InterestExpense	284us-gaap_InterestExpense
Provision (benefit) for income taxes	72us-gaap_IncomeTaxExpenseBenefit	166us-gaap_IncomeTaxExpenseBenefit	364us-gaap_IncomeTaxExpenseBenefit
Net income (loss)	569us-gaap_NetIncomeLoss	250us-gaap_NetIncomeLoss	1,234us-gaap_NetIncomeLoss
Parent Company [Member]
Condensed Income Statements, Captions [Line Items]
Net investment income	44us-gaap_NetInvestmentIncome / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	50us-gaap_NetInvestmentIncome / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	60us-gaap_NetInvestmentIncome / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Net gains (losses) on financial instruments at fair value and foreign exchange	24mbi_NetGainsLossesOnFinancialInstrumentsAtFairValueAndForeignExchange / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	11mbi_NetGainsLossesOnFinancialInstrumentsAtFairValueAndForeignExchange / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	(119)mbi_NetGainsLossesOnFinancialInstrumentsAtFairValueAndForeignExchange / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Investment losses related to other-than-temporary impairments:
Investment losses related to other-than-temporary impairments	0us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsAvailableforsaleSecurities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	0us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsAvailableforsaleSecurities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	(52)us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsAvailableforsaleSecurities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Other-than-temporary impairments recognized in accumulated other comprehensive income (loss)	0us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossBeforeTaxIncludingPortionAttributableToNoncontrollingInterestAvailableforsaleSecurities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	0us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossBeforeTaxIncludingPortionAttributableToNoncontrollingInterestAvailableforsaleSecurities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	(7)us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossBeforeTaxIncludingPortionAttributableToNoncontrollingInterestAvailableforsaleSecurities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Net investment losses related to other-than-temporary impairments	0us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNet / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	0us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNet / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	(59)us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNet / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Net gains (losses) on extinguishment of debt	1us-gaap_GainsLossesOnExtinguishmentOfDebt / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	43us-gaap_GainsLossesOnExtinguishmentOfDebt / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	(2)us-gaap_GainsLossesOnExtinguishmentOfDebt / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Other net realized gains (losses)	1us-gaap_OtherIncome / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	0us-gaap_OtherIncome / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	6us-gaap_OtherIncome / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Total revenues	70us-gaap_Revenues / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	104us-gaap_Revenues / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	(114)us-gaap_Revenues / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Operating	25us-gaap_OperatingExpenses / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	69us-gaap_OperatingExpenses / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	40us-gaap_OperatingExpenses / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Interest	104us-gaap_InterestExpense / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	105us-gaap_InterestExpense / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	155us-gaap_InterestExpense / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Total expenses	129us-gaap_CostsAndExpenses / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	174us-gaap_CostsAndExpenses / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	195us-gaap_CostsAndExpenses / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Gain (loss) before income taxes and equity in earnings of subsidiaries	(59)mbi_IncomeLossBeforeIncomeTaxesAndEquityInEarningsOfSubsidiaries / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	(70)mbi_IncomeLossBeforeIncomeTaxesAndEquityInEarningsOfSubsidiaries / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	(309)mbi_IncomeLossBeforeIncomeTaxesAndEquityInEarningsOfSubsidiaries / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Provision (benefit) for income taxes	(165)us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	(202)us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	(781)us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Gain (loss) before equity in earnings of subsidiaries	106mbi_IncomeLossBeforeEquityInEarningsOfSubsidiaries / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	132mbi_IncomeLossBeforeEquityInEarningsOfSubsidiaries / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	472mbi_IncomeLossBeforeEquityInEarningsOfSubsidiaries / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Equity in net income (loss) of subsidiaries	463us-gaap_IncomeLossFromSubsidiariesNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	118us-gaap_IncomeLossFromSubsidiariesNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	762us-gaap_IncomeLossFromSubsidiariesNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Net income (loss)	$ 569us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	$ 250us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	$ 1,234us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember

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