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Schedule II (Condensed Statements Of Comprehensive Income (Loss)) (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Net income (loss)	$ 569us-gaap_NetIncomeLoss	$ 250us-gaap_NetIncomeLoss	$ 1,234us-gaap_NetIncomeLoss
Unrealized gains (losses) on available-for-sale securities: [Abstract]
Unrealized gains (losses) arising during the period	254us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	(213)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	176us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax
Provision (benefit) for income taxes	83us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	(76)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	72us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax
Total	171us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	(137)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	104us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax
Reclassification adjustments for (gains) losses included in net income (loss)	15us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax	(13)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax	39us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax
Provision (benefit) for income taxes	6us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax	(5)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax	14us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax
Total	9us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax	(8)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax	25us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax
Available-for-sale securities with other-than-temporary impairments: [Abstract]
Other-than-temporary impairments and unrealized gains (losses) arising during the period	(85)mbi_OtherComprehensiveIncomeUnrealizedHoldingGainLossArisingDuringPeriodOnSecuritiesWithOtherThanTemporaryImpairmentLossesBeforeTax	15mbi_OtherComprehensiveIncomeUnrealizedHoldingGainLossArisingDuringPeriodOnSecuritiesWithOtherThanTemporaryImpairmentLossesBeforeTax	50mbi_OtherComprehensiveIncomeUnrealizedHoldingGainLossArisingDuringPeriodOnSecuritiesWithOtherThanTemporaryImpairmentLossesBeforeTax
Provision (benefit) for income taxes	(31)mbi_OtherComprehensiveIncomeUnrealizedHoldingGainLossArisingDuringPeriodOnSecuritiesWithOtherThanTemporaryImpairmentLossesTax	6mbi_OtherComprehensiveIncomeUnrealizedHoldingGainLossArisingDuringPeriodOnSecuritiesWithOtherThanTemporaryImpairmentLossesTax	18mbi_OtherComprehensiveIncomeUnrealizedHoldingGainLossArisingDuringPeriodOnSecuritiesWithOtherThanTemporaryImpairmentLossesTax
Total	(54)mbi_OtherComprehensiveIncomeUnrealizedHoldingGainLossArisingDuringPeriodOnSecuritiesWithOtherThanTemporaryImpairmentLossesAfterTax	9mbi_OtherComprehensiveIncomeUnrealizedHoldingGainLossArisingDuringPeriodOnSecuritiesWithOtherThanTemporaryImpairmentLossesAfterTax	32mbi_OtherComprehensiveIncomeUnrealizedHoldingGainLossArisingDuringPeriodOnSecuritiesWithOtherThanTemporaryImpairmentLossesAfterTax
Reclassification adjustments for (gains) losses included in net income (loss)	6mbi_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAociForSaleAndForWritedownOfSecuritiesBeforeTax	(5)mbi_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAociForSaleAndForWritedownOfSecuritiesBeforeTax	69mbi_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAociForSaleAndForWritedownOfSecuritiesBeforeTax
Provision (benefit) for income taxes	2mbi_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAociForSaleAndForWritedownOfSecuritiesTax	(2)mbi_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAociForSaleAndForWritedownOfSecuritiesTax	24mbi_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAociForSaleAndForWritedownOfSecuritiesTax
Total	4mbi_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAociForSaleAndForWritedownOfSecuritiesNetOfTax	(3)mbi_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAociForSaleAndForWritedownOfSecuritiesNetOfTax	45mbi_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAociForSaleAndForWritedownOfSecuritiesNetOfTax
Foreign currency translation: [Abstract]
Foreign currency translation gains (losses)	(40)us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossBeforeReclassificationAndTax	3us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossBeforeReclassificationAndTax	24us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossBeforeReclassificationAndTax
Provision (benefit) for income taxes	(13)us-gaap_OtherComprehensiveIncomeForeignCurrencyTranslationGainLossArisingDuringPeriodTax	1us-gaap_OtherComprehensiveIncomeForeignCurrencyTranslationGainLossArisingDuringPeriodTax	(2)us-gaap_OtherComprehensiveIncomeForeignCurrencyTranslationGainLossArisingDuringPeriodTax
Foreign currency translation gains (losses)	(27)us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax	2us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax	26us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax
Total other comprehensive income (loss)	107us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	(142)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	232us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
Comprehensive income (loss)	676us-gaap_ComprehensiveIncomeNetOfTax	108us-gaap_ComprehensiveIncomeNetOfTax	1,466us-gaap_ComprehensiveIncomeNetOfTax
Parent Company [Member]
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
Unrealized gains (losses) on available-for-sale securities: [Abstract]
Unrealized gains (losses) arising during the period	126us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	(179)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	166us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Provision (benefit) for income taxes	14us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	(17)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	36us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Total	112us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	(162)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	130us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Reclassification adjustments for (gains) losses included in net income (loss)	23us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	23us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	111us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Provision (benefit) for income taxes	8us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	8us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	39us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Total	15us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	15us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	72us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Available-for-sale securities with other-than-temporary impairments: [Abstract]
Other-than-temporary impairments and unrealized gains (losses) arising during the period	0mbi_OtherComprehensiveIncomeUnrealizedHoldingGainLossArisingDuringPeriodOnSecuritiesWithOtherThanTemporaryImpairmentLossesBeforeTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	12mbi_OtherComprehensiveIncomeUnrealizedHoldingGainLossArisingDuringPeriodOnSecuritiesWithOtherThanTemporaryImpairmentLossesBeforeTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	38mbi_OtherComprehensiveIncomeUnrealizedHoldingGainLossArisingDuringPeriodOnSecuritiesWithOtherThanTemporaryImpairmentLossesBeforeTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Provision (benefit) for income taxes	0mbi_OtherComprehensiveIncomeUnrealizedHoldingGainLossArisingDuringPeriodOnSecuritiesWithOtherThanTemporaryImpairmentLossesTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	4mbi_OtherComprehensiveIncomeUnrealizedHoldingGainLossArisingDuringPeriodOnSecuritiesWithOtherThanTemporaryImpairmentLossesTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	13mbi_OtherComprehensiveIncomeUnrealizedHoldingGainLossArisingDuringPeriodOnSecuritiesWithOtherThanTemporaryImpairmentLossesTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Total	0mbi_OtherComprehensiveIncomeUnrealizedHoldingGainLossArisingDuringPeriodOnSecuritiesWithOtherThanTemporaryImpairmentLossesAfterTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	8mbi_OtherComprehensiveIncomeUnrealizedHoldingGainLossArisingDuringPeriodOnSecuritiesWithOtherThanTemporaryImpairmentLossesAfterTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	25mbi_OtherComprehensiveIncomeUnrealizedHoldingGainLossArisingDuringPeriodOnSecuritiesWithOtherThanTemporaryImpairmentLossesAfterTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Reclassification adjustments for (gains) losses included in net income (loss)	4mbi_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAociForSaleAndForWritedownOfSecuritiesBeforeTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	0mbi_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAociForSaleAndForWritedownOfSecuritiesBeforeTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	31mbi_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAociForSaleAndForWritedownOfSecuritiesBeforeTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Provision (benefit) for income taxes	1mbi_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAociForSaleAndForWritedownOfSecuritiesTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	0mbi_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAociForSaleAndForWritedownOfSecuritiesTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	11mbi_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAociForSaleAndForWritedownOfSecuritiesTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Total	3mbi_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAociForSaleAndForWritedownOfSecuritiesNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	0mbi_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAociForSaleAndForWritedownOfSecuritiesNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	20mbi_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAociForSaleAndForWritedownOfSecuritiesNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Foreign currency translation: [Abstract]
Foreign currency translation gains (losses)	(23)us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	(3)us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	(15)us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Total other comprehensive income (loss)	107us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	(142)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	232us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Comprehensive income (loss)	$ 676us-gaap_ComprehensiveIncomeNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	$ 108us-gaap_ComprehensiveIncomeNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	$ 1,466us-gaap_ComprehensiveIncomeNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember

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