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Schedule II - (Notes to Condensed Financial Statements) (Detail) (USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Fair value of securities pledged as collateral | $ 532 us-gaap_SecurityOwnedAndPledgedAsCollateralFairValue | $ 735 us-gaap_SecurityOwnedAndPledgedAsCollateralFairValue |
Securities posted as collateral to derivative counterparties | 198 us-gaap_DerivativeCollateralRightToReclaimSecurities | 42 us-gaap_DerivativeCollateralRightToReclaimSecurities |
National Public Finance Guarantee Holdings, Inc. [Member] |  |  |
Dividends from subsidiaries | 220 us-gaap_CashDividendsPaidToParentCompanyByConsolidatedSubsidiaries / dei_LegalEntityAxis = mbi_NationalPublicFinanceGuaranteeHoldingsMember | 214 us-gaap_CashDividendsPaidToParentCompanyByConsolidatedSubsidiaries / dei_LegalEntityAxis = mbi_NationalPublicFinanceGuaranteeHoldingsMember |
Trifinium Holdings Limited [Member] |  |  |
Dividends from subsidiaries | 5 us-gaap_CashDividendsPaidToParentCompanyByConsolidatedSubsidiaries / dei_LegalEntityAxis = mbi_TrifiniumHoldingsLimitedMember |  |
MBIA Services Corporation [Member] |  |  |
Dividends from subsidiaries |  | 2 us-gaap_CashDividendsPaidToParentCompanyByConsolidatedSubsidiaries / dei_LegalEntityAxis = mbi_MbiaServicesCorporationMember | 53 us-gaap_CashDividendsPaidToParentCompanyByConsolidatedSubsidiaries / dei_LegalEntityAxis = mbi_MbiaServicesCorporationMember
CapMAC Holdings Inc. [Member] |  |  |
Dividends from subsidiaries |  | 3 us-gaap_CashDividendsPaidToParentCompanyByConsolidatedSubsidiaries / dei_LegalEntityAxis = mbi_CapmacHoldingsMember |
MBIA Asset Finance, LLC [Member] |  |  |
Dividends from subsidiaries |  |  | 6 us-gaap_CashDividendsPaidToParentCompanyByConsolidatedSubsidiaries / dei_LegalEntityAxis = mbi_MbiaAssetFinanceMember
Euro Asset Acquisition Limited [Member] |  |  |
Dividends from subsidiaries |  |  | 1 us-gaap_CashDividendsPaidToParentCompanyByConsolidatedSubsidiaries / dei_LegalEntityAxis = mbi_EuroAssetAcquisitionLimitedMember
MBIA Inc. [Member] |  |  |
Liquid assets | 498 mbi_LiquidAssets / dei_LegalEntityAxis = mbi_MbiaIncMember | 359 mbi_LiquidAssets / dei_LegalEntityAxis = mbi_MbiaIncMember |
Fair value of securities pledged as collateral | 273 us-gaap_SecurityOwnedAndPledgedAsCollateralFairValue / dei_LegalEntityAxis = mbi_MbiaIncMember | 270 us-gaap_SecurityOwnedAndPledgedAsCollateralFairValue / dei_LegalEntityAxis = mbi_MbiaIncMember |
Securities posted as collateral to derivative counterparties | 199 us-gaap_DerivativeCollateralRightToReclaimSecurities / dei_LegalEntityAxis = mbi_MbiaIncMember | 42 us-gaap_DerivativeCollateralRightToReclaimSecurities / dei_LegalEntityAxis = mbi_MbiaIncMember |
Fair Value Of The Collateral Pledged By MBIA Inc [Member] | MBIA Inc. [Member] |  |  |
Money market securities pledged as collateral under investment agreements | $ 26 us-gaap_ShortTermInvestments / us-gaap_DerivativeByNatureAxis = us-gaap_SecuritiesPledgedAsCollateralMember / dei_LegalEntityAxis = mbi_MbiaIncMember | $ 22 us-gaap_ShortTermInvestments / us-gaap_DerivativeByNatureAxis = us-gaap_SecuritiesPledgedAsCollateralMember / dei_LegalEntityAxis = mbi_MbiaIncMember |

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