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Schedule II - Condensed Statements Of Cash Flows (Detail) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Cash flows from operating activities: |  |  |
Investment income received | $ 419 us-gaap_ProceedsFromInterestAndDividendsReceived | $ 426 us-gaap_ProceedsFromInterestAndDividendsReceived | $ 594 us-gaap_ProceedsFromInterestAndDividendsReceived
Operating expenses paid | (238)us-gaap_PaymentsForOperatingActivities | (277)us-gaap_PaymentsForOperatingActivities | (400)us-gaap_PaymentsForOperatingActivities
Interest paid, net of interest converted to principal | (179)us-gaap_InterestPaidNet | (224)us-gaap_InterestPaidNet | (400)us-gaap_InterestPaidNet
Income taxes (paid) received | (17)us-gaap_IncomeTaxesPaidNet | (1)us-gaap_IncomeTaxesPaidNet | (6)us-gaap_IncomeTaxesPaidNet
Net cash provided (used) by operating activities | (333)us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations | 1,829 us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations | (1,027)us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
Cash flows from investing activities: |  |  |
Purchases of available-for-sale investments | (1,494)us-gaap_PaymentsToAcquireAvailableForSaleSecurities | (2,397)us-gaap_PaymentsToAcquireAvailableForSaleSecurities | (3,086)us-gaap_PaymentsToAcquireAvailableForSaleSecurities
Sales of available-for-sale investments | 757 us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities | 1,726 us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities | 4,658 us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities
Paydowns and maturities of available-for-sale investments | 484 us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities | 452 us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities | 609 us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities
Purchases of investments at fair value | (631)mbi_PaymentsToAcquireFairValueOptionAndTradingSecurities | (371)mbi_PaymentsToAcquireFairValueOptionAndTradingSecurities | (346)mbi_PaymentsToAcquireFairValueOptionAndTradingSecurities
Sales, paydowns and maturities of investments at fair value | 789 mbi_ProceedsFromSalesMaturitiesAndPaydownsOfFairValueAndTradingSecurities | 595 mbi_ProceedsFromSalesMaturitiesAndPaydownsOfFairValueAndTradingSecurities | 960 mbi_ProceedsFromSalesMaturitiesAndPaydownsOfFairValueAndTradingSecurities
Sales, paydowns and maturities (purchases) of short-term investments, net | 515 us-gaap_PaymentsForProceedsFromShortTermInvestments | (358)us-gaap_PaymentsForProceedsFromShortTermInvestments | 739 us-gaap_PaymentsForProceedsFromShortTermInvestments
Proceeds From Sales Maturities Prepayments and Calls Of Other Investments | 1 mbi_ProceedsFromSalesMaturitiesPrepaymentsAndCallsOfOtherInvestments | 0 mbi_ProceedsFromSalesMaturitiesPrepaymentsAndCallsOfOtherInvestments | 0 mbi_ProceedsFromSalesMaturitiesPrepaymentsAndCallsOfOtherInvestments
(Payments) proceeds for derivative settlements | (26)us-gaap_PaymentsForProceedsFromDerivativeInstrumentInvestingActivities | (54)us-gaap_PaymentsForProceedsFromDerivativeInstrumentInvestingActivities | (288)us-gaap_PaymentsForProceedsFromDerivativeInstrumentInvestingActivities
Collateral (to) from swap counterparty | 144 us-gaap_IncreaseDecreaseCashCollateralFromCounterparties | 122 us-gaap_IncreaseDecreaseCashCollateralFromCounterparties | (285)us-gaap_IncreaseDecreaseCashCollateralFromCounterparties
Net cash provided (used) by investing activities | 812 us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations | (6)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations | 4,195 us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations
Cash flows from financing activities: |  |  |
Proceeds from investment agreements | 30 us-gaap_ProceedsFromIssuanceOfOtherLongTermDebt | 31 us-gaap_ProceedsFromIssuanceOfOtherLongTermDebt | 36 us-gaap_ProceedsFromIssuanceOfOtherLongTermDebt
Principal paydowns of investment agreements | (192)us-gaap_RepaymentsOfOtherLongTermDebt | (285)us-gaap_RepaymentsOfOtherLongTermDebt | (688)us-gaap_RepaymentsOfOtherLongTermDebt
Payments for securities sold under agreements to repurchase | 0 us-gaap_ProceedsFromPaymentsForInSecuritiesSoldUnderAgreementsToRepurchase | 0 us-gaap_ProceedsFromPaymentsForInSecuritiesSoldUnderAgreementsToRepurchase | (287)us-gaap_ProceedsFromPaymentsForInSecuritiesSoldUnderAgreementsToRepurchase
Payments for retirement of debt | 0 us-gaap_RepaymentsOfLongTermDebt | (3)us-gaap_RepaymentsOfLongTermDebt | (540)us-gaap_RepaymentsOfLongTermDebt
Purchases of treasury stock | (32)us-gaap_PaymentsForRepurchaseOfCommonStock | 0 us-gaap_PaymentsForRepurchaseOfCommonStock | 0 us-gaap_PaymentsForRepurchaseOfCommonStock
Restricted stock awards settlements | 0 us-gaap_ProceedsFromStockPlans | 0 us-gaap_ProceedsFromStockPlans | 1 us-gaap_ProceedsFromStockPlans
Net cash provided (used) by financing activities | (892)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations | (1,566)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations | (2,811)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations
Effect of exchange rate changes on cash and cash equivalents | (8)us-gaap_EffectOfExchangeRateOnCashAndCashEquivalentsContinuingOperations | 11 us-gaap_EffectOfExchangeRateOnCashAndCashEquivalentsContinuingOperations | 0 us-gaap_EffectOfExchangeRateOnCashAndCashEquivalentsContinuingOperations
Net increase (decrease) in cash and cash equivalents | (421)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease | 268 us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease | 357 us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Cash and cash equivalents - beginning of year | 1,258 us-gaap_CashAndCashEquivalentsAtCarryingValue | 990 us-gaap_CashAndCashEquivalentsAtCarryingValue | 633 us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash and cash equivalents - end of year | 782 us-gaap_CashAndCashEquivalentsAtCarryingValue | 1,258 us-gaap_CashAndCashEquivalentsAtCarryingValue | 990 us-gaap_CashAndCashEquivalentsAtCarryingValue
Reconciliation of net income (loss) to net cash provided (used) by operating activities: [Abstract] |  |  |
Net income (loss) | 569 us-gaap_NetIncomeLoss | 250 us-gaap_NetIncomeLoss | 1,234 us-gaap_NetIncomeLoss
Change in: [Abstract] |  |  |
Net investment losses related to other-than-temporary impairments | 15 mbi_NetOtherThanTemporaryImpairments | 0 mbi_NetOtherThanTemporaryImpairments | 105 mbi_NetOtherThanTemporaryImpairments
Net (gains) losses on financial instruments at fair value and foreign exchange | (128)mbi_IncreaseDecreaseInNetGainsLossesOnFinancialInstrumentsAtFairValueAndForeignExchange | (244)mbi_IncreaseDecreaseInNetGainsLossesOnFinancialInstrumentsAtFairValueAndForeignExchange | (73)mbi_IncreaseDecreaseInNetGainsLossesOnFinancialInstrumentsAtFairValueAndForeignExchange
Other net realized (gains) losses | (25)mbi_IncreaseDecreaseInOtherNetRealizedGainsLosses | 28 mbi_IncreaseDecreaseInOtherNetRealizedGainsLosses | (7)mbi_IncreaseDecreaseInOtherNetRealizedGainsLosses
Deferred income tax provision (benefit) | 50 us-gaap_DeferredIncomeTaxExpenseBenefit | 157 us-gaap_DeferredIncomeTaxExpenseBenefit | 365 us-gaap_DeferredIncomeTaxExpenseBenefit
(Gains) losses on extinguishment of debt | 0 mbi_AdjustmentGainsLossesOnExtinguishmentOfDebt | (61)mbi_AdjustmentGainsLossesOnExtinguishmentOfDebt | (49)mbi_AdjustmentGainsLossesOnExtinguishmentOfDebt
Other operating | 114 us-gaap_OtherNoncashIncomeExpense | 103 us-gaap_OtherNoncashIncomeExpense | 138 us-gaap_OtherNoncashIncomeExpense
Total adjustments to net income (loss) | (902)us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities | 1,579 us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities | (2,261)us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities
Net cash provided (used) by operating activities | (333)us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations | 1,829 us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations | (1,027)us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
Parent Company [Member] |  |  |
Cash flows from operating activities: |  |  |
Fees and reimbursements received | 1 us-gaap_ProceedsFromFeesReceived / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 us-gaap_ProceedsFromFeesReceived / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 5 us-gaap_ProceedsFromFeesReceived / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Investment income received | 256 us-gaap_ProceedsFromInterestAndDividendsReceived / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 250 us-gaap_ProceedsFromInterestAndDividendsReceived / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 118 us-gaap_ProceedsFromInterestAndDividendsReceived / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Operating expenses paid | (35)us-gaap_PaymentsForOperatingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (35)us-gaap_PaymentsForOperatingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (43)us-gaap_PaymentsForOperatingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Interest paid, net of interest converted to principal | (93)us-gaap_InterestPaidNet / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (93)us-gaap_InterestPaidNet / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (101)us-gaap_InterestPaidNet / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Income taxes (paid) received | 59 us-gaap_IncomeTaxesPaidNet / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 111 us-gaap_IncomeTaxesPaidNet / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 224 us-gaap_IncomeTaxesPaidNet / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Net cash provided (used) by operating activities | 188 us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 233 us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 203 us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Cash flows from investing activities: |  |  |
Purchases of available-for-sale investments | (125)us-gaap_PaymentsToAcquireAvailableForSaleSecurities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (287)us-gaap_PaymentsToAcquireAvailableForSaleSecurities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (560)us-gaap_PaymentsToAcquireAvailableForSaleSecurities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Sales of available-for-sale investments | 268 us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 147 us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 1,148 us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Paydowns and maturities of available-for-sale investments | 98 us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 252 us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 1,036 us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Purchases of investments at fair value | (266)mbi_PaymentsToAcquireFairValueOptionAndTradingSecurities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (144)mbi_PaymentsToAcquireFairValueOptionAndTradingSecurities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (42)mbi_PaymentsToAcquireFairValueOptionAndTradingSecurities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Sales, paydowns and maturities of investments at fair value | 280 mbi_ProceedsFromSalesMaturitiesAndPaydownsOfFairValueAndTradingSecurities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 126 mbi_ProceedsFromSalesMaturitiesAndPaydownsOfFairValueAndTradingSecurities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 139 mbi_ProceedsFromSalesMaturitiesAndPaydownsOfFairValueAndTradingSecurities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Sales, paydowns and maturities (purchases) of short-term investments, net | (242)us-gaap_PaymentsForProceedsFromShortTermInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 94 us-gaap_PaymentsForProceedsFromShortTermInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 114 us-gaap_PaymentsForProceedsFromShortTermInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
(Payments) proceeds for derivative settlements | (26)us-gaap_PaymentsForProceedsFromDerivativeInstrumentInvestingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (32)us-gaap_PaymentsForProceedsFromDerivativeInstrumentInvestingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (207)us-gaap_PaymentsForProceedsFromDerivativeInstrumentInvestingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Collateral (to) from swap counterparty | 144 us-gaap_IncreaseDecreaseCashCollateralFromCounterparties / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 122 us-gaap_IncreaseDecreaseCashCollateralFromCounterparties / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (285)us-gaap_IncreaseDecreaseCashCollateralFromCounterparties / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Contributions to subsidiaries, net | (20)mbi_ContributionsToSubsidiaries / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 2 mbi_ContributionsToSubsidiaries / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (12)mbi_ContributionsToSubsidiaries / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Advances to subsidiaries, net | (12)us-gaap_PaymentsForProceedsFromOtherInvestingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 us-gaap_PaymentsForProceedsFromOtherInvestingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 1 us-gaap_PaymentsForProceedsFromOtherInvestingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Net cash provided (used) by investing activities | 99 us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 280 us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 1,332 us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Cash flows from financing activities: |  |  |
Proceeds from investment agreements | 23 us-gaap_ProceedsFromIssuanceOfOtherLongTermDebt / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 25 us-gaap_ProceedsFromIssuanceOfOtherLongTermDebt / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 31 us-gaap_ProceedsFromIssuanceOfOtherLongTermDebt / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Principal paydowns of investment agreements | (181)us-gaap_RepaymentsOfOtherLongTermDebt / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (274)us-gaap_RepaymentsOfOtherLongTermDebt / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (679)us-gaap_RepaymentsOfOtherLongTermDebt / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Payments for securities sold under agreements to repurchase | 0 us-gaap_ProceedsFromPaymentsForInSecuritiesSoldUnderAgreementsToRepurchase / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (32)us-gaap_ProceedsFromPaymentsForInSecuritiesSoldUnderAgreementsToRepurchase / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (639)us-gaap_ProceedsFromPaymentsForInSecuritiesSoldUnderAgreementsToRepurchase / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Payments for retirement of debt | 0 us-gaap_RepaymentsOfLongTermDebt / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (3)us-gaap_RepaymentsOfLongTermDebt / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (180)us-gaap_RepaymentsOfLongTermDebt / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Payments for affiliate loans | (153)us-gaap_RepaymentsOfRelatedPartyDebt / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (194)us-gaap_RepaymentsOfRelatedPartyDebt / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (109)us-gaap_RepaymentsOfRelatedPartyDebt / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Purchases of treasury stock | (32)us-gaap_PaymentsForRepurchaseOfCommonStock / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 us-gaap_PaymentsForRepurchaseOfCommonStock / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 us-gaap_PaymentsForRepurchaseOfCommonStock / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Restricted stock awards settlements | 16 us-gaap_ProceedsFromStockPlans / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 13 us-gaap_ProceedsFromStockPlans / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 1 us-gaap_ProceedsFromStockPlans / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Net cash provided (used) by financing activities | (327)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (465)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (1,575)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Net increase (decrease) in cash and cash equivalents | (40)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 48 us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (40)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Cash and cash equivalents - beginning of year | 140 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 92 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 132 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Cash and cash equivalents - end of year | 100 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 140 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 92 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Reconciliation of net income (loss) to net cash provided (used) by operating activities: [Abstract] |  |  |
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
Change in: [Abstract] |  |  |
Intercompany accounts receivable | (24)us-gaap_IncreaseDecreaseInAccountsReceivableRelatedParties / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (14)us-gaap_IncreaseDecreaseInAccountsReceivableRelatedParties / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (9)us-gaap_IncreaseDecreaseInAccountsReceivableRelatedParties / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Current income taxes | 70 us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 116 us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 57 us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Equity in earnings of subsidiaries | (463)mbi_EquityInNetIncomeLossOfSubsidiaries / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (118)mbi_EquityInNetIncomeLossOfSubsidiaries / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (762)mbi_EquityInNetIncomeLossOfSubsidiaries / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Dividends from subsidiaries | 225 us-gaap_CashDividendsPaidToParentCompanyByConsolidatedSubsidiaries / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 219 us-gaap_CashDividendsPaidToParentCompanyByConsolidatedSubsidiaries / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 60 us-gaap_CashDividendsPaidToParentCompanyByConsolidatedSubsidiaries / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Net investment losses related to other-than-temporary impairments | 0 mbi_NetOtherThanTemporaryImpairments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 mbi_NetOtherThanTemporaryImpairments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 59 mbi_NetOtherThanTemporaryImpairments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Net (gains) losses on financial instruments at fair value and foreign exchange | (24)mbi_IncreaseDecreaseInNetGainsLossesOnFinancialInstrumentsAtFairValueAndForeignExchange / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (11)mbi_IncreaseDecreaseInNetGainsLossesOnFinancialInstrumentsAtFairValueAndForeignExchange / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 119 mbi_IncreaseDecreaseInNetGainsLossesOnFinancialInstrumentsAtFairValueAndForeignExchange / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Other net realized (gains) losses | (1)mbi_IncreaseDecreaseInOtherNetRealizedGainsLosses / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 mbi_IncreaseDecreaseInOtherNetRealizedGainsLosses / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (6)mbi_IncreaseDecreaseInOtherNetRealizedGainsLosses / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Deferred income tax provision (benefit) | (176)us-gaap_DeferredIncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (207)us-gaap_DeferredIncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (613)us-gaap_DeferredIncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
(Gains) losses on extinguishment of debt | (1)mbi_AdjustmentGainsLossesOnExtinguishmentOfDebt / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (43)mbi_AdjustmentGainsLossesOnExtinguishmentOfDebt / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 2 mbi_AdjustmentGainsLossesOnExtinguishmentOfDebt / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Other operating | 13 us-gaap_OtherNoncashIncomeExpense / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 41 us-gaap_OtherNoncashIncomeExpense / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 62 us-gaap_OtherNoncashIncomeExpense / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Total adjustments to net income (loss) | (381)us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (17)us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (1,031)us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Net cash provided (used) by operating activities | $ 188 us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | $ 233 us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | $ 203 us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations / dei_LegalEntityAxis = us-gaap_ParentCompanyMember

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- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash -URI http://asc.fasb.org/extlink&oid=6506951 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 1 -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=28358313&loc=d3e6676-107765 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3044-108585 + Details
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- Definition The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income, net of any cash received during the current period as refunds for the overpayment of taxes. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4297-108586 + Details
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- Definition Amount of cash inflow (outflow) of investing activities, excluding discontinued operations. Investing activity cash flows include making and collecting loans and acquiring and disposing of debt or equity instruments and property, plant, and equipment and other productive assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3521-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 26 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3574-108585 + Details
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- Definition Amount of cash inflow (outflow) from operating activities, excluding discontinued operations. Operating activity cash flows include transactions, adjustments, and changes in value not defined as investing or financing activities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3521-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3536-108585 + Details
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- Definition The cash inflow associated with maturities (principal being due), prepayments and calls (requests of early payments) on securities not classified as either held-to-maturity securities or trading securities which are classified as available-for-sale securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26853-111562 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585 + Details
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- Definition The cash flow from investments sold under the agreement to repurchase such investment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3095-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3098-108585 + Details
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- Definition The cash inflow associated with the sale of debt and equity securities classified as available-for-sale securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26853-111562 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585 + Details
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- Definition The cash inflow associated with the amount received from the stock plan during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585 + Details
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- Definition The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + Details
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- Definition The cash outflow attributable to repayments of borrowings not otherwise defined in the taxonomy (with maturities initially due after one year or beyond the operating cycle if longer). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + Details
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- Definition The cash outflow for the payment of a long-term borrowing made from a related party where one party can exercise control or significant influence over another party; including affiliates, owners or officers and their immediate families, pension trusts, and so forth. Alternate caption: Payments for Advances from Affiliates. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + Details
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