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Insurance Premiums (Unearned Premium Revenue Balance And Future Expected Earnings) (Detail) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Insurance Premiums [Line Items]  
Three months ended, March 31, 2015, Total Expected Future Premium Earnings $ 58us-gaap_FinancialGuaranteeInsuranceContractsFutureExpectedPremiumRevenueToBeRecognizedDuringFirstQuarterFollowingBalanceSheetDate
Three months ended, June 30, 2015, Total Expected Future Premium Earnings 57us-gaap_FinancialGuaranteeInsuranceContractsFutureExpectedPremiumRevenueToBeRecognizedDuringSecondQuarterFollowingBalanceSheetDate
Three months ended, September 30, 2015, Total Expected Future Premium Earnings 55us-gaap_FinancialGuaranteeInsuranceContractsFutureExpectedPremiumRevenueToBeRecognizedDuringThirdQuarterFollowingBalanceSheetDate
Three months ended, December 31, 2015, Total Expected Future Premium Earnings 54us-gaap_FinancialGuaranteeInsuranceContractsFutureExpectedPremiumRevenueToBeRecognizedDuringFourthQuarterFollowingBalanceSheetDate
Twelve months ended, December 31, 2016, Total Expected Future Premium Earnings 204us-gaap_FinancialGuaranteeInsuranceContractsFutureExpectedPremiumRevenueToBeRecognizedMoreThanOneAndWithinTwoYearsFromBalanceSheetDate
Twelve months ended, December 31, 2017, Total Expected Future Premium Earnings 187us-gaap_FinancialGuaranteeInsuranceContractsFutureExpectedPremiumRevenueToBeRecognizedMoreThanTwoAndWithinThreeYearsFromBalanceSheetDate
Twelve months ended, December 31, 2018, Total Expected Future Premium Earnings 168us-gaap_FinancialGuaranteeInsuranceContractsFutureExpectedPremiumRevenueToBeRecognizedMoreThanThreeAndWithinFourYearsFromBalanceSheetDate
Twelve months ended, December 31, 2019, Total Expected Future Premium Earnings 155us-gaap_FinancialGuaranteeInsuranceContractsFutureExpectedPremiumRevenueToBeRecognizedMoreThanFourAndWithinFiveYearsFromBalanceSheetDate
Five years ended, December 31, 2024, Total Expected Future Premium Earnings 599mbi_FinancialGuaranteeInsuranceContractsFutureExpectedPremiumRevenueToBeRecognizedDuringSixthThroughTenthYearFollowingBalanceSheetDate
Five years ended, December 31, 2029, Total Expected Future Premium Earnings 362mbi_FinancialGuaranteeInsuranceContractsFutureExpectedPremiumRevenueToBeRecognizedDuringEleventhThroughFifteenthYearFollowingBalanceSheetDate
Five years ended, December 31, 2034 and thereafter, Total Expected Future Premium Earnings 323mbi_FinancialGuaranteeInsuranceContractsFutureExpectedPremiumRevenueToBeRecognizedDuringSixteenthYearAndThereafterFollowingBalanceSheetDate
Total Expected Future Premium Earnings 2,222us-gaap_FinancialGuaranteeInsuranceContractsFutureExpectedPremiumRevenueToBeRecognized
Unearned Premium Revenue [Member]  
Insurance Premiums [Line Items]  
Unearned Premiums 1,986us-gaap_UnearnedPremiums
/ us-gaap_DeferredRevenueArrangementTypeAxis
= mbi_UnearnedPremiumRevenueMember
Unearned Premium Revenue [Member] | March Thirty One Two Thousand Fifeteen [Member]  
Insurance Premiums [Line Items]  
Unearned Premiums 1,934us-gaap_UnearnedPremiums
/ us-gaap_DeferredRevenueArrangementTypeAxis
= mbi_UnearnedPremiumRevenueMember
/ us-gaap_StatementScenarioAxis
= mbi_MarchThirtyOneTwoThousandFifteenMember
Unearned Premium Revenue [Member] | June Thirty Two Thousand Fifeteen [Member]  
Insurance Premiums [Line Items]  
Unearned Premiums 1,883us-gaap_UnearnedPremiums
/ us-gaap_DeferredRevenueArrangementTypeAxis
= mbi_UnearnedPremiumRevenueMember
/ us-gaap_StatementScenarioAxis
= mbi_JuneThirtyTwoThousandFifeteenMember
Unearned Premium Revenue [Member] | September Thirty Two Thousand Fifeteen [Member]  
Insurance Premiums [Line Items]  
Unearned Premiums 1,834us-gaap_UnearnedPremiums
/ us-gaap_DeferredRevenueArrangementTypeAxis
= mbi_UnearnedPremiumRevenueMember
/ us-gaap_StatementScenarioAxis
= mbi_SeptemberThirtyTwoThousandFifeteenMember
Unearned Premium Revenue [Member] | December Thirty One Two Thousand Fifeteen [Member]  
Insurance Premiums [Line Items]  
Unearned Premiums 1,786us-gaap_UnearnedPremiums
/ us-gaap_DeferredRevenueArrangementTypeAxis
= mbi_UnearnedPremiumRevenueMember
/ us-gaap_StatementScenarioAxis
= mbi_DecemberThirtyOneTwoThousandFifeteenMember
Unearned Premium Revenue [Member] | December Thirty One Two Thousand Sixteen [Member]  
Insurance Premiums [Line Items]  
Unearned Premiums 1,603us-gaap_UnearnedPremiums
/ us-gaap_DeferredRevenueArrangementTypeAxis
= mbi_UnearnedPremiumRevenueMember
/ us-gaap_StatementScenarioAxis
= mbi_DecemberThirtyOneTwoThousandSixteenrMember
Unearned Premium Revenue [Member] | December Thirty One Two Thousand Seventeen [Member]  
Insurance Premiums [Line Items]  
Unearned Premiums 1,436us-gaap_UnearnedPremiums
/ us-gaap_DeferredRevenueArrangementTypeAxis
= mbi_UnearnedPremiumRevenueMember
/ us-gaap_StatementScenarioAxis
= mbi_DecemberThirtyOneTwoThousandSeventeenMember
Unearned Premium Revenue [Member] | December Thirty One Two Thousand Eighteen [Member]  
Insurance Premiums [Line Items]  
Unearned Premiums 1,286us-gaap_UnearnedPremiums
/ us-gaap_DeferredRevenueArrangementTypeAxis
= mbi_UnearnedPremiumRevenueMember
/ us-gaap_StatementScenarioAxis
= mbi_DecemberThirtyOneTwoThousandEighteenMember
Unearned Premium Revenue [Member] | December Thirty One Two Thousand Twenty Nineteen [Member] [Member]  
Insurance Premiums [Line Items]  
Unearned Premiums 1,148us-gaap_UnearnedPremiums
/ us-gaap_DeferredRevenueArrangementTypeAxis
= mbi_UnearnedPremiumRevenueMember
/ us-gaap_StatementScenarioAxis
= mbi_DecemberThirtyOneTwoThousandTwentyNineteenMemberMember
Unearned Premium Revenue [Member] | December Thirty One Two Thousand Twenty Four [Member]  
Insurance Premiums [Line Items]  
Unearned Premiums 613us-gaap_UnearnedPremiums
/ us-gaap_DeferredRevenueArrangementTypeAxis
= mbi_UnearnedPremiumRevenueMember
/ us-gaap_StatementScenarioAxis
= mbi_DecemberThirtyOneTwoThousandTwentyFourMember
Unearned Premium Revenue [Member] | December Thirty One Two Thousand Twenty Nine[Member]  
Insurance Premiums [Line Items]  
Unearned Premiums 288us-gaap_UnearnedPremiums
/ us-gaap_DeferredRevenueArrangementTypeAxis
= mbi_UnearnedPremiumRevenueMember
/ us-gaap_StatementScenarioAxis
= mbi_DecemberThirtyOneTwoThousandTwentyNineMember
Unearned Premium Revenue [Member] | December Thirty One Two Thousand Thirty Four And Thereafter [Member]  
Insurance Premiums [Line Items]  
Unearned Premiums 0us-gaap_UnearnedPremiums
/ us-gaap_DeferredRevenueArrangementTypeAxis
= mbi_UnearnedPremiumRevenueMember
/ us-gaap_StatementScenarioAxis
= mbi_DecemberThirtyOneTwoThousandThirtyFourAndThereafterMember
Upfront [Member]  
Insurance Premiums [Line Items]  
Three months ended, March 31, 2015, Total Expected Future Premium Earnings 30us-gaap_FinancialGuaranteeInsuranceContractsFutureExpectedPremiumRevenueToBeRecognizedDuringFirstQuarterFollowingBalanceSheetDate
/ us-gaap_DeferredRevenueArrangementTypeAxis
= mbi_UpfrontMember
Three months ended, June 30, 2015, Total Expected Future Premium Earnings 29us-gaap_FinancialGuaranteeInsuranceContractsFutureExpectedPremiumRevenueToBeRecognizedDuringSecondQuarterFollowingBalanceSheetDate
/ us-gaap_DeferredRevenueArrangementTypeAxis
= mbi_UpfrontMember
Three months ended, September 30, 2015, Total Expected Future Premium Earnings 28us-gaap_FinancialGuaranteeInsuranceContractsFutureExpectedPremiumRevenueToBeRecognizedDuringThirdQuarterFollowingBalanceSheetDate
/ us-gaap_DeferredRevenueArrangementTypeAxis
= mbi_UpfrontMember
Three months ended, December 31, 2015, Total Expected Future Premium Earnings 27us-gaap_FinancialGuaranteeInsuranceContractsFutureExpectedPremiumRevenueToBeRecognizedDuringFourthQuarterFollowingBalanceSheetDate
/ us-gaap_DeferredRevenueArrangementTypeAxis
= mbi_UpfrontMember
Twelve months ended, December 31, 2016, Total Expected Future Premium Earnings 102us-gaap_FinancialGuaranteeInsuranceContractsFutureExpectedPremiumRevenueToBeRecognizedMoreThanOneAndWithinTwoYearsFromBalanceSheetDate
/ us-gaap_DeferredRevenueArrangementTypeAxis
= mbi_UpfrontMember
Twelve months ended, December 31, 2017, Total Expected Future Premium Earnings 93us-gaap_FinancialGuaranteeInsuranceContractsFutureExpectedPremiumRevenueToBeRecognizedMoreThanTwoAndWithinThreeYearsFromBalanceSheetDate
/ us-gaap_DeferredRevenueArrangementTypeAxis
= mbi_UpfrontMember
Twelve months ended, December 31, 2018, Total Expected Future Premium Earnings 85us-gaap_FinancialGuaranteeInsuranceContractsFutureExpectedPremiumRevenueToBeRecognizedMoreThanThreeAndWithinFourYearsFromBalanceSheetDate
/ us-gaap_DeferredRevenueArrangementTypeAxis
= mbi_UpfrontMember
Twelve months ended, December 31, 2019, Total Expected Future Premium Earnings 78us-gaap_FinancialGuaranteeInsuranceContractsFutureExpectedPremiumRevenueToBeRecognizedMoreThanFourAndWithinFiveYearsFromBalanceSheetDate
/ us-gaap_DeferredRevenueArrangementTypeAxis
= mbi_UpfrontMember
Five years ended, December 31, 2024, Total Expected Future Premium Earnings 294mbi_FinancialGuaranteeInsuranceContractsFutureExpectedPremiumRevenueToBeRecognizedDuringSixthThroughTenthYearFollowingBalanceSheetDate
/ us-gaap_DeferredRevenueArrangementTypeAxis
= mbi_UpfrontMember
Five years ended, December 31, 2029, Total Expected Future Premium Earnings 171mbi_FinancialGuaranteeInsuranceContractsFutureExpectedPremiumRevenueToBeRecognizedDuringEleventhThroughFifteenthYearFollowingBalanceSheetDate
/ us-gaap_DeferredRevenueArrangementTypeAxis
= mbi_UpfrontMember
Five years ended, December 31, 2034 and thereafter, Total Expected Future Premium Earnings 146mbi_FinancialGuaranteeInsuranceContractsFutureExpectedPremiumRevenueToBeRecognizedDuringSixteenthYearAndThereafterFollowingBalanceSheetDate
/ us-gaap_DeferredRevenueArrangementTypeAxis
= mbi_UpfrontMember
Total Expected Future Premium Earnings 1,083us-gaap_FinancialGuaranteeInsuranceContractsFutureExpectedPremiumRevenueToBeRecognized
/ us-gaap_DeferredRevenueArrangementTypeAxis
= mbi_UpfrontMember
Installments [Member]  
Insurance Premiums [Line Items]  
Three months ended, March 31, 2015, Total Expected Future Premium Earnings 22us-gaap_FinancialGuaranteeInsuranceContractsFutureExpectedPremiumRevenueToBeRecognizedDuringFirstQuarterFollowingBalanceSheetDate
/ us-gaap_DeferredRevenueArrangementTypeAxis
= mbi_InstallmentsMember
Three months ended, June 30, 2015, Total Expected Future Premium Earnings 22us-gaap_FinancialGuaranteeInsuranceContractsFutureExpectedPremiumRevenueToBeRecognizedDuringSecondQuarterFollowingBalanceSheetDate
/ us-gaap_DeferredRevenueArrangementTypeAxis
= mbi_InstallmentsMember
Three months ended, September 30, 2015, Total Expected Future Premium Earnings 21us-gaap_FinancialGuaranteeInsuranceContractsFutureExpectedPremiumRevenueToBeRecognizedDuringThirdQuarterFollowingBalanceSheetDate
/ us-gaap_DeferredRevenueArrangementTypeAxis
= mbi_InstallmentsMember
Three months ended, December 31, 2015, Total Expected Future Premium Earnings 21us-gaap_FinancialGuaranteeInsuranceContractsFutureExpectedPremiumRevenueToBeRecognizedDuringFourthQuarterFollowingBalanceSheetDate
/ us-gaap_DeferredRevenueArrangementTypeAxis
= mbi_InstallmentsMember
Twelve months ended, December 31, 2016, Total Expected Future Premium Earnings 81us-gaap_FinancialGuaranteeInsuranceContractsFutureExpectedPremiumRevenueToBeRecognizedMoreThanOneAndWithinTwoYearsFromBalanceSheetDate
/ us-gaap_DeferredRevenueArrangementTypeAxis
= mbi_InstallmentsMember
Twelve months ended, December 31, 2017, Total Expected Future Premium Earnings 74us-gaap_FinancialGuaranteeInsuranceContractsFutureExpectedPremiumRevenueToBeRecognizedMoreThanTwoAndWithinThreeYearsFromBalanceSheetDate
/ us-gaap_DeferredRevenueArrangementTypeAxis
= mbi_InstallmentsMember
Twelve months ended, December 31, 2018, Total Expected Future Premium Earnings 65us-gaap_FinancialGuaranteeInsuranceContractsFutureExpectedPremiumRevenueToBeRecognizedMoreThanThreeAndWithinFourYearsFromBalanceSheetDate
/ us-gaap_DeferredRevenueArrangementTypeAxis
= mbi_InstallmentsMember
Twelve months ended, December 31, 2019, Total Expected Future Premium Earnings 60us-gaap_FinancialGuaranteeInsuranceContractsFutureExpectedPremiumRevenueToBeRecognizedMoreThanFourAndWithinFiveYearsFromBalanceSheetDate
/ us-gaap_DeferredRevenueArrangementTypeAxis
= mbi_InstallmentsMember
Five years ended, December 31, 2024, Total Expected Future Premium Earnings 241mbi_FinancialGuaranteeInsuranceContractsFutureExpectedPremiumRevenueToBeRecognizedDuringSixthThroughTenthYearFollowingBalanceSheetDate
/ us-gaap_DeferredRevenueArrangementTypeAxis
= mbi_InstallmentsMember
Five years ended, December 31, 2029, Total Expected Future Premium Earnings 154mbi_FinancialGuaranteeInsuranceContractsFutureExpectedPremiumRevenueToBeRecognizedDuringEleventhThroughFifteenthYearFollowingBalanceSheetDate
/ us-gaap_DeferredRevenueArrangementTypeAxis
= mbi_InstallmentsMember
Five years ended, December 31, 2034 and thereafter, Total Expected Future Premium Earnings 142mbi_FinancialGuaranteeInsuranceContractsFutureExpectedPremiumRevenueToBeRecognizedDuringSixteenthYearAndThereafterFollowingBalanceSheetDate
/ us-gaap_DeferredRevenueArrangementTypeAxis
= mbi_InstallmentsMember
Total Expected Future Premium Earnings 903us-gaap_FinancialGuaranteeInsuranceContractsFutureExpectedPremiumRevenueToBeRecognized
/ us-gaap_DeferredRevenueArrangementTypeAxis
= mbi_InstallmentsMember
Accretion [Member]  
Insurance Premiums [Line Items]  
Three months ended, March 31, 2015, Total Expected Future Premium Earnings 6us-gaap_FinancialGuaranteeInsuranceContractsFutureExpectedPremiumRevenueToBeRecognizedDuringFirstQuarterFollowingBalanceSheetDate
/ us-gaap_DeferredRevenueArrangementTypeAxis
= mbi_AccretionMember
Three months ended, June 30, 2015, Total Expected Future Premium Earnings 6us-gaap_FinancialGuaranteeInsuranceContractsFutureExpectedPremiumRevenueToBeRecognizedDuringSecondQuarterFollowingBalanceSheetDate
/ us-gaap_DeferredRevenueArrangementTypeAxis
= mbi_AccretionMember
Three months ended, September 30, 2015, Total Expected Future Premium Earnings 6us-gaap_FinancialGuaranteeInsuranceContractsFutureExpectedPremiumRevenueToBeRecognizedDuringThirdQuarterFollowingBalanceSheetDate
/ us-gaap_DeferredRevenueArrangementTypeAxis
= mbi_AccretionMember
Three months ended, December 31, 2015, Total Expected Future Premium Earnings 6us-gaap_FinancialGuaranteeInsuranceContractsFutureExpectedPremiumRevenueToBeRecognizedDuringFourthQuarterFollowingBalanceSheetDate
/ us-gaap_DeferredRevenueArrangementTypeAxis
= mbi_AccretionMember
Twelve months ended, December 31, 2016, Total Expected Future Premium Earnings 21us-gaap_FinancialGuaranteeInsuranceContractsFutureExpectedPremiumRevenueToBeRecognizedMoreThanOneAndWithinTwoYearsFromBalanceSheetDate
/ us-gaap_DeferredRevenueArrangementTypeAxis
= mbi_AccretionMember
Twelve months ended, December 31, 2017, Total Expected Future Premium Earnings 20us-gaap_FinancialGuaranteeInsuranceContractsFutureExpectedPremiumRevenueToBeRecognizedMoreThanTwoAndWithinThreeYearsFromBalanceSheetDate
/ us-gaap_DeferredRevenueArrangementTypeAxis
= mbi_AccretionMember
Twelve months ended, December 31, 2018, Total Expected Future Premium Earnings 18us-gaap_FinancialGuaranteeInsuranceContractsFutureExpectedPremiumRevenueToBeRecognizedMoreThanThreeAndWithinFourYearsFromBalanceSheetDate
/ us-gaap_DeferredRevenueArrangementTypeAxis
= mbi_AccretionMember
Twelve months ended, December 31, 2019, Total Expected Future Premium Earnings 17us-gaap_FinancialGuaranteeInsuranceContractsFutureExpectedPremiumRevenueToBeRecognizedMoreThanFourAndWithinFiveYearsFromBalanceSheetDate
/ us-gaap_DeferredRevenueArrangementTypeAxis
= mbi_AccretionMember
Five years ended, December 31, 2024, Total Expected Future Premium Earnings 64mbi_FinancialGuaranteeInsuranceContractsFutureExpectedPremiumRevenueToBeRecognizedDuringSixthThroughTenthYearFollowingBalanceSheetDate
/ us-gaap_DeferredRevenueArrangementTypeAxis
= mbi_AccretionMember
Five years ended, December 31, 2029, Total Expected Future Premium Earnings 37mbi_FinancialGuaranteeInsuranceContractsFutureExpectedPremiumRevenueToBeRecognizedDuringEleventhThroughFifteenthYearFollowingBalanceSheetDate
/ us-gaap_DeferredRevenueArrangementTypeAxis
= mbi_AccretionMember
Five years ended, December 31, 2034 and thereafter, Total Expected Future Premium Earnings 35mbi_FinancialGuaranteeInsuranceContractsFutureExpectedPremiumRevenueToBeRecognizedDuringSixteenthYearAndThereafterFollowingBalanceSheetDate
/ us-gaap_DeferredRevenueArrangementTypeAxis
= mbi_AccretionMember
Total Expected Future Premium Earnings $ 236us-gaap_FinancialGuaranteeInsuranceContractsFutureExpectedPremiumRevenueToBeRecognized
/ us-gaap_DeferredRevenueArrangementTypeAxis
= mbi_AccretionMember