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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 | $ 78 mbi_NetGainsLossesOnFinancialInstrumentsAtFairValueAndForeignExchange | $ 69 mbi_NetGainsLossesOnFinancialInstrumentsAtFairValueAndForeignExchange | $ 55 mbi_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 | 3 us-gaap_GainsLossesOnExtinguishmentOfDebt | 60 us-gaap_GainsLossesOnExtinguishmentOfDebt |
Other net realized gains (losses) | 28 us-gaap_OtherIncome | (29)us-gaap_OtherIncome | 7 us-gaap_OtherIncome
Total revenues | 1,270 us-gaap_Revenues | 1,209 us-gaap_Revenues | 2,435 us-gaap_Revenues
Interest | 210 us-gaap_InterestExpense | 236 us-gaap_InterestExpense | 284 us-gaap_InterestExpense
Provision (benefit) for income taxes | 72 us-gaap_IncomeTaxExpenseBenefit | 166 us-gaap_IncomeTaxExpenseBenefit | 364 us-gaap_IncomeTaxExpenseBenefit
Net income (loss) | 569 us-gaap_NetIncomeLoss | 250 us-gaap_NetIncomeLoss | 1,234 us-gaap_NetIncomeLoss
Parent Company [Member] |  |  |
Condensed Income Statements, Captions [Line Items] |  |  |
Net investment income | 44 us-gaap_NetInvestmentIncome / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 50 us-gaap_NetInvestmentIncome / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 60 us-gaap_NetInvestmentIncome / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Net gains (losses) on financial instruments at fair value and foreign exchange | 24 mbi_NetGainsLossesOnFinancialInstrumentsAtFairValueAndForeignExchange / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 11 mbi_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 | 0 us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsAvailableforsaleSecurities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 us-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) | 0 us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossBeforeTaxIncludingPortionAttributableToNoncontrollingInterestAvailableforsaleSecurities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 us-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 | 0 us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNet / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNet / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (59)us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNet / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Net gains (losses) on extinguishment of debt | 1 us-gaap_GainsLossesOnExtinguishmentOfDebt / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 43 us-gaap_GainsLossesOnExtinguishmentOfDebt / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (2)us-gaap_GainsLossesOnExtinguishmentOfDebt / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Other net realized gains (losses) | 1 us-gaap_OtherIncome / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 us-gaap_OtherIncome / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 6 us-gaap_OtherIncome / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Total revenues | 70 us-gaap_Revenues / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 104 us-gaap_Revenues / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (114)us-gaap_Revenues / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Operating | 25 us-gaap_OperatingExpenses / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 69 us-gaap_OperatingExpenses / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 40 us-gaap_OperatingExpenses / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Interest | 104 us-gaap_InterestExpense / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 105 us-gaap_InterestExpense / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 155 us-gaap_InterestExpense / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Total expenses | 129 us-gaap_CostsAndExpenses / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 174 us-gaap_CostsAndExpenses / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 195 us-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 | 106 mbi_IncomeLossBeforeEquityInEarningsOfSubsidiaries / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 132 mbi_IncomeLossBeforeEquityInEarningsOfSubsidiaries / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 472 mbi_IncomeLossBeforeEquityInEarningsOfSubsidiaries / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Equity in net income (loss) of subsidiaries | 463 us-gaap_IncomeLossFromSubsidiariesNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 118 us-gaap_IncomeLossFromSubsidiariesNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 762 us-gaap_IncomeLossFromSubsidiariesNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Net income (loss) | $ 569 us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | $ 250 us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | $ 1,234 us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember

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- Definition The amount by which the fair value of an investment in debt and equity securities categorized as Available-for-sale is less than the amortized cost basis or carrying amount of that investment at the balance sheet date and the decline in fair value is deemed to be other than temporary, before considering whether or not such amount is recognized in earnings or other comprehensive income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 + Details
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