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Derivative Instruments (Narrative) (Detail) (USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013
Derivative [Line Items] |  |
Maximum amount of future guarantee payments | $ 9,700,000,000 mbi_GuaranteeObligationsMaximumNetExposure |
Insured derivatives ceded under reinsurance agreements | 13,000,000 mbi_DerivativesCededUnderReinsuranceAgreements |
Cash collateral posted to derivative counterparties | 12,000,000 us-gaap_DerivativeCollateralRightToReclaimCash | 160,000,000 us-gaap_DerivativeCollateralRightToReclaimCash
Securities posted as collateral to derivative counterparties | 198,000,000 us-gaap_DerivativeCollateralRightToReclaimSecurities | 42,000,000 us-gaap_DerivativeCollateralRightToReclaimSecurities
Number of credit support annexes | 1 mbi_NumberOfCreditSupportAnnexes | 1 mbi_NumberOfCreditSupportAnnexes
Fair value of Credit Support Annex | 2,000,000 mbi_FairValueOfCreditSupportAnnexes | 4,000,000 mbi_FairValueOfCreditSupportAnnexes
Amount of counterparty netting | 81,000,000 mbi_DerivativeAssetCounterpartyNettingAmountFairValue | 42,000,000 mbi_DerivativeAssetCounterpartyNettingAmountFairValue
Derivative assets, after counterparty netting | 10,000,000 mbi_DerivativeFairValueOfDerivativeAssetNetOfCounterpartyNetting | 13,000,000 mbi_DerivativeFairValueOfDerivativeAssetNetOfCounterpartyNetting
Other assets and other assets of consolidated VIEs, after counterparty netting and embedded reclass | 2,000,000 mbi_OtherAssetsAndDerivativeAssetsVieAfterCounterpartyNettingAndEmbeddedReclass | 4,000,000 mbi_OtherAssetsAndDerivativeAssetsVieAfterCounterpartyNettingAndEmbeddedReclass
Counterparty netting | 81,000,000 mbi_DerivativeLiabilityCounterpartyNetting | 42,000,000 mbi_DerivativeLiabilityCounterpartyNetting
Derivative liabilities, after counterparty netting and posting of cash collateral | 456,000,000 mbi_DerivativeFairValueOfDerivativeLiabilityNetOfCounterpartyNetting | 1,200,000,000 mbi_DerivativeFairValueOfDerivativeLiabilityNetOfCounterpartyNetting
Derivative liabilities and derivative liabilities of consolidated VIEs, after counterparty netting and embedded reclass | 437,000,000 mbi_OtherLiabilitiesAndDerivativeLiabilitiesVieAfterCounterpartyNettingAndEmbeddedReclass |
Derivative Liabilities [Member] |  |
Derivative [Line Items] |  |
Cash collateral posted to derivative counterparties | 0 us-gaap_DerivativeCollateralRightToReclaimCash / us-gaap_BalanceSheetLocationAxis = mbi_DerivativeLiabilitiesMember | 123,000,000 us-gaap_DerivativeCollateralRightToReclaimCash / us-gaap_BalanceSheetLocationAxis = mbi_DerivativeLiabilitiesMember
Other Liabilities [Member] |  |
Derivative [Line Items] |  |
Cash collateral posted to derivative counterparties | 12,000,000 us-gaap_DerivativeCollateralRightToReclaimCash / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherLiabilitiesMember | 16,000,000 us-gaap_DerivativeCollateralRightToReclaimCash / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherLiabilitiesMember
Other Assets [Member] |  |
Derivative [Line Items] |  |
Cash collateral posted to derivative counterparties |  | 21,000,000 us-gaap_DerivativeCollateralRightToReclaimCash / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherAssetsMember
Medium Term Notes And Other Investments [Member] | Embedded [Member] |  |
Derivative [Line Items] |  |
Embedded derivative assets | 8,000,000 us-gaap_DerivativeFairValueOfDerivativeAsset / us-gaap_BalanceSheetLocationAxis = mbi_MediumTermNotesAndOtherInvestmentsMember / us-gaap_DerivativeInstrumentRiskAxis = mbi_EmbeddedMember | 9,000,000 us-gaap_DerivativeFairValueOfDerivativeAsset / us-gaap_BalanceSheetLocationAxis = mbi_MediumTermNotesAndOtherInvestmentsMember / us-gaap_DerivativeInstrumentRiskAxis = mbi_EmbeddedMember
Total derivative liabilities | $ 19,000,000 us-gaap_DerivativeFairValueOfDerivativeLiability / us-gaap_BalanceSheetLocationAxis = mbi_MediumTermNotesAndOtherInvestmentsMember / us-gaap_DerivativeInstrumentRiskAxis = mbi_EmbeddedMember | $ 19,000,000 us-gaap_DerivativeFairValueOfDerivativeLiability / us-gaap_BalanceSheetLocationAxis = mbi_MediumTermNotesAndOtherInvestmentsMember / us-gaap_DerivativeInstrumentRiskAxis = mbi_EmbeddedMember

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- Definition Derivative Asset Counterparty Netting Amount Fair Value + References No definition available. + Details
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- Definition Derivative Fair Value Of Derivative Asset Net Of Counterparty Netting + References No definition available. + Details
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- Definition Derivatives Ceded Under Reinsurance Agreements + References No definition available. + Details
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- Definition Fair value of credit support annexes which define the terms or rules under which collateral is posted or transferred between swap counterparties to mitigate the credit risk arising from "in the money" derivative positions. + References No definition available. + Details
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- Definition Maximum potential amount of future payments (undiscounted) the guarantor could be required to make under the guarantee or each group of similar guarantees after (net of) reduction for potential recoveries under recourse or collateralization provisions. + References No definition available. + Details
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- Definition Number of credit support annexes which define the terms or rules under which collateral is posted or transferred between swap counterparties to mitigate the credit risk arising from "in the money" derivative positions. + References No definition available. + Details
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- Definition Derivative Fair Value Of Derivative Assets Reported In Derivative Assets And Derivative Assets VIEs Net Of Counterparty Netting And Embedded Reclasses + References No definition available. + Details
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- Definition Amount of right to receive cash collateral under master netting arrangements that have not been offset against derivative liabilities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=28370219&loc=SL20226016-175313 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=20225523&loc=SL20225862-175312 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=7476318&loc=d3e41678-113959 + Details
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- Definition Amount of right to receive securities collateral under master netting arrangements that have not been offset against derivative liabilities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=28370219&loc=SL20226016-175313 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=20225523&loc=SL20225862-175312 + Details
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