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Schedule II (Condensed Balance Sheets) (Detail) (USD $) In Millions, except Share data, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
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Assets [Abstract] |  |  |  |
Cash and cash equivalents | $ 782 us-gaap_CashAndCashEquivalentsAtCarryingValue | $ 1,258 us-gaap_CashAndCashEquivalentsAtCarryingValue | $ 990 us-gaap_CashAndCashEquivalentsAtCarryingValue | $ 633 us-gaap_CashAndCashEquivalentsAtCarryingValue
Total assets | 16,284 us-gaap_Assets | 16,953 us-gaap_Assets | 21,724 us-gaap_Assets |
Liabilities: |  |  |  |
Long-term debt | 1,810 us-gaap_LongTermDebtNoncurrent | 1,702 us-gaap_LongTermDebtNoncurrent |  |
Derivative liabilities | 246 us-gaap_DerivativeLiabilities | 1,200 us-gaap_DerivativeLiabilities |  |
Total liabilities | 12,334 us-gaap_Liabilities | 13,654 us-gaap_Liabilities |  |
Equity: |  |  |  |
Preferred stock, par value $1 per share; authorized shares--10,000,000; issued and outstanding--none | 0 us-gaap_PreferredStockValue | 0 us-gaap_PreferredStockValue |  |
Common stock, par value $1 per share; authorized shares--400,000,000; issued shares--281,352,782 and 277,812,430 | 281 us-gaap_CommonStockValue | 278 us-gaap_CommonStockValue |  |
Additional paid-in capital | 3,128 us-gaap_AdditionalPaidInCapital | 3,115 us-gaap_AdditionalPaidInCapital |  |
Retained earnings | 2,858 us-gaap_RetainedEarningsAccumulatedDeficit | 2,289 us-gaap_RetainedEarningsAccumulatedDeficit |  |
Accumulated other comprehensive income (loss), net of tax of $6 and $26 | 21 us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax | (86)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax | 56 us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax | (176)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
Treasury stock, at cost--89,409,887 and 85,562,546 shares | (2,359)us-gaap_TreasuryStockValue | (2,318)us-gaap_TreasuryStockValue |  |
Total shareholders' equity of MBIA Inc. | 3,929 us-gaap_StockholdersEquity | 3,278 us-gaap_StockholdersEquity |  |
Total liabilities and equity | 16,284 us-gaap_LiabilitiesAndStockholdersEquity | 16,953 us-gaap_LiabilitiesAndStockholdersEquity |  |
Fixed-maturity securities held as available-for-sale, amortized cost | 6,509 us-gaap_AvailableForSaleSecuritiesAmortizedCost | 6,824 us-gaap_AvailableForSaleSecuritiesAmortizedCost |  |
Preferred stock, par value | $ 1 us-gaap_PreferredStockParOrStatedValuePerShare | $ 1 us-gaap_PreferredStockParOrStatedValuePerShare |  |
Preferred stock, authorized shares | 10,000,000 us-gaap_PreferredStockSharesAuthorized | 10,000,000 us-gaap_PreferredStockSharesAuthorized |  |
Preferred stock, issued | 0 us-gaap_PreferredStockSharesIssued | 0 us-gaap_PreferredStockSharesIssued |  |
Preferred stock, outstanding | 0 us-gaap_PreferredStockSharesOutstanding | 0 us-gaap_PreferredStockSharesOutstanding |  |
Common stock, par value | $ 1 us-gaap_CommonStockParOrStatedValuePerShare | $ 1 us-gaap_CommonStockParOrStatedValuePerShare |  |
Common stock, authorized shares | 400,000,000 us-gaap_CommonStockSharesAuthorized | 400,000,000 us-gaap_CommonStockSharesAuthorized |  |
Common stock, issued shares | 281,352,782 us-gaap_CommonStockSharesIssued | 277,812,430 us-gaap_CommonStockSharesIssued |  |
Accumulated other comprehensive income (loss), taxes | 7 mbi_AccumulatedOtherComprehensiveIncomeLossDeferredIncomeTax | 54 mbi_AccumulatedOtherComprehensiveIncomeLossDeferredIncomeTax |  |
Treasury stock, shares | 89,409,887 us-gaap_TreasuryStockShares | 85,562,546 us-gaap_TreasuryStockShares |  |
Parent Company [Member] |  |  |  |
Assets [Abstract] |  |  |  |
Fixed-maturity securities held as available-for-sale, at fair value (amortized cost $671 and $703) | 751 us-gaap_AvailableForSaleSecuritiesNoncurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 728 us-gaap_AvailableForSaleSecuritiesNoncurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Investments carried at fair value | 33 us-gaap_TradingSecurities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 32 us-gaap_TradingSecurities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Investments pledged as collateral, at fair value (amortized cost $445 and $463) | 408 us-gaap_AvailableForSaleSecuritiesPledgedAsCollateral / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 375 us-gaap_AvailableForSaleSecuritiesPledgedAsCollateral / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Short-term investments held as available-for-sale, at fair value (amortized cost $327 and $171) | 327 us-gaap_AvailableForSaleSecuritiesCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 171 us-gaap_AvailableForSaleSecuritiesCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Other investments | 4 us-gaap_OtherInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 3 us-gaap_OtherInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Total investments | 1,523 us-gaap_Investments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 1,309 us-gaap_Investments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Cash and cash equivalents | 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 | 132 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Investment in wholly-owned subsidiaries | 3,953 mbi_InvestmentInWhollyOwnedSubsidiaries / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 3,890 mbi_InvestmentInWhollyOwnedSubsidiaries / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Deferred income taxes, net | 965 us-gaap_DeferredTaxAssetsNet / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 791 us-gaap_DeferredTaxAssetsNet / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Other assets | 143 us-gaap_OtherAssets / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 140 us-gaap_OtherAssets / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Total assets | 6,684 us-gaap_Assets / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 6,270 us-gaap_Assets / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Liabilities: |  |  |  |
Investment agreements | 505 us-gaap_BorrowingsUnderGuaranteedInvestmentAgreements / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 654 us-gaap_BorrowingsUnderGuaranteedInvestmentAgreements / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Long-term debt | 592 us-gaap_LongTermDebtNoncurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 592 us-gaap_LongTermDebtNoncurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Affiliate loans payable | 1,207 us-gaap_LoansPayable / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 1,510 us-gaap_LoansPayable / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Other liabilities | 451 us-gaap_OtherLiabilities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 236 us-gaap_OtherLiabilities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Total liabilities | 2,755 us-gaap_Liabilities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 2,992 us-gaap_Liabilities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Equity: |  |  |  |
Preferred stock, par value $1 per share; authorized shares--10,000,000; issued and outstanding--none | 0 us-gaap_PreferredStockValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 us-gaap_PreferredStockValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Common stock, par value $1 per share; authorized shares--400,000,000; issued shares--281,352,782 and 277,812,430 | 281 us-gaap_CommonStockValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 278 us-gaap_CommonStockValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Additional paid-in capital | 3,128 us-gaap_AdditionalPaidInCapital / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 3,115 us-gaap_AdditionalPaidInCapital / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Retained earnings | 2,858 us-gaap_RetainedEarningsAccumulatedDeficit / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 2,289 us-gaap_RetainedEarningsAccumulatedDeficit / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Accumulated other comprehensive income (loss), net of tax of $6 and $26 | 21 us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (86)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Treasury stock, at cost--89,409,887 and 85,562,546 shares | (2,359)us-gaap_TreasuryStockValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (2,318)us-gaap_TreasuryStockValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Total shareholders' equity of MBIA Inc. | 3,929 us-gaap_StockholdersEquity / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 3,278 us-gaap_StockholdersEquity / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Total liabilities and equity | 6,684 us-gaap_LiabilitiesAndStockholdersEquity / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 6,270 us-gaap_LiabilitiesAndStockholdersEquity / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Fixed-maturity securities held as available-for-sale, amortized cost | 671 us-gaap_AvailableForSaleSecuritiesAmortizedCost / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 703 us-gaap_AvailableForSaleSecuritiesAmortizedCost / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Investments pledged as collateral, amortized cost | 445 mbi_InvestmentsPledgedAsCollateralAmortizedCost / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 463 mbi_InvestmentsPledgedAsCollateralAmortizedCost / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Short-term investments held as available-for-sale, amortized cost | 327 us-gaap_AvailableForSaleSecuritiesShortTermInvestmentsAmortizedCost / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 171 us-gaap_AvailableForSaleSecuritiesShortTermInvestmentsAmortizedCost / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Preferred stock, par value | $ 1 us-gaap_PreferredStockParOrStatedValuePerShare / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | $ 1 us-gaap_PreferredStockParOrStatedValuePerShare / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Preferred stock, authorized shares | 10,000,000 us-gaap_PreferredStockSharesAuthorized / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 10,000,000 us-gaap_PreferredStockSharesAuthorized / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Preferred stock, issued | 0 us-gaap_PreferredStockSharesIssued / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 us-gaap_PreferredStockSharesIssued / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Preferred stock, outstanding | 0 us-gaap_PreferredStockSharesOutstanding / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 us-gaap_PreferredStockSharesOutstanding / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Common stock, par value | $ 1 us-gaap_CommonStockParOrStatedValuePerShare / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | $ 1 us-gaap_CommonStockParOrStatedValuePerShare / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Common stock, authorized shares | 400,000,000 us-gaap_CommonStockSharesAuthorized / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 400,000,000 us-gaap_CommonStockSharesAuthorized / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Common stock, issued shares | 281,352,782 us-gaap_CommonStockSharesIssued / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 277,812,430 us-gaap_CommonStockSharesIssued / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Accumulated other comprehensive income (loss), taxes | $ 6 mbi_AccumulatedOtherComprehensiveIncomeLossDeferredIncomeTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | $ 25 mbi_AccumulatedOtherComprehensiveIncomeLossDeferredIncomeTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Treasury stock, shares | 89,409,887 us-gaap_TreasuryStockShares / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 85,562,546 us-gaap_TreasuryStockShares / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |

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