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Loss And Loss Adjustment Expense Reserves (Schedule Of Present Value Of The Probability-Weighted Future Claim Payments And Recoveries) (Detail) (USD $) | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
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Loss Reserves Claim Liability [Member] | Classified [Member] |  |  |
Loss And Loss Adjustment Expense Reserves [Line Items] |  |  |
Loss and loss adjustment expense reserves | $ 464,000,000 us-gaap_LiabilityForClaimsAndClaimsAdjustmentExpense / mbi_ClaimLiabilityAxis = mbi_LossReservesClaimLiabilityMember / mbi_ClassifiedStatusAxis = mbi_ClassifiedMember | $ 580,000,000 us-gaap_LiabilityForClaimsAndClaimsAdjustmentExpense / mbi_ClaimLiabilityAxis = mbi_LossReservesClaimLiabilityMember / mbi_ClassifiedStatusAxis = mbi_ClassifiedMember |
Lae Reserves [Member] | Classified [Member] |  |  |
Loss And Loss Adjustment Expense Reserves [Line Items] |  |  |
Loss and loss adjustment expense reserves | 42,000,000 us-gaap_LiabilityForClaimsAndClaimsAdjustmentExpense / mbi_ClaimLiabilityAxis = mbi_LaeReservesMember / mbi_ClassifiedStatusAxis = mbi_ClassifiedMember | 61,000,000 us-gaap_LiabilityForClaimsAndClaimsAdjustmentExpense / mbi_ClaimLiabilityAxis = mbi_LaeReservesMember / mbi_ClassifiedStatusAxis = mbi_ClassifiedMember |
Loss And Lae Reserves [Member] |  |  |
Loss And Loss Adjustment Expense Reserves [Line Items] |  |  |
Loss and loss adjustment expense reserves | 506,000,000 us-gaap_LiabilityForClaimsAndClaimsAdjustmentExpense / mbi_ClaimLiabilityAxis = mbi_LossAndLaeReservesMember | 641,000,000 us-gaap_LiabilityForClaimsAndClaimsAdjustmentExpense / mbi_ClaimLiabilityAxis = mbi_LossAndLaeReservesMember | 853,000,000 us-gaap_LiabilityForClaimsAndClaimsAdjustmentExpense / mbi_ClaimLiabilityAxis = mbi_LossAndLaeReservesMember
Loss And Lae Reserves [Member] | Classified [Member] |  |  |
Loss And Loss Adjustment Expense Reserves [Line Items] |  |  |
Loss and loss adjustment expense reserves | 506,000,000 us-gaap_LiabilityForClaimsAndClaimsAdjustmentExpense / mbi_ClaimLiabilityAxis = mbi_LossAndLaeReservesMember / mbi_ClassifiedStatusAxis = mbi_ClassifiedMember | 641,000,000 us-gaap_LiabilityForClaimsAndClaimsAdjustmentExpense / mbi_ClaimLiabilityAxis = mbi_LossAndLaeReservesMember / mbi_ClassifiedStatusAxis = mbi_ClassifiedMember |
Insurance Loss Recoverable [Member] |  |  |
Loss And Loss Adjustment Expense Reserves [Line Items] |  |  |
Insurance loss recoverable | (533,000,000)mbi_InsuranceLossRecoverable / mbi_ClaimLiabilityAxis = mbi_InsuranceLossRecoverableMember | (694,000,000)mbi_InsuranceLossRecoverable / mbi_ClaimLiabilityAxis = mbi_InsuranceLossRecoverableMember | (3,648,000,000)mbi_InsuranceLossRecoverable / mbi_ClaimLiabilityAxis = mbi_InsuranceLossRecoverableMember
Insurance Loss Recoverable [Member] | Classified [Member] |  |  |
Loss And Loss Adjustment Expense Reserves [Line Items] |  |  |
Insurance claim loss recoverable | (533,000,000)us-gaap_EstimatedInsuranceRecoveries / mbi_ClaimLiabilityAxis = mbi_InsuranceLossRecoverableMember / mbi_ClassifiedStatusAxis = mbi_ClassifiedMember | (694,000,000)us-gaap_EstimatedInsuranceRecoveries / mbi_ClaimLiabilityAxis = mbi_InsuranceLossRecoverableMember / mbi_ClassifiedStatusAxis = mbi_ClassifiedMember |
LAE insurance loss recoverable | 0 mbi_LaeInsuranceLossRecoverable / mbi_ClaimLiabilityAxis = mbi_InsuranceLossRecoverableMember / mbi_ClassifiedStatusAxis = mbi_ClassifiedMember | 0 mbi_LaeInsuranceLossRecoverable / mbi_ClaimLiabilityAxis = mbi_InsuranceLossRecoverableMember / mbi_ClassifiedStatusAxis = mbi_ClassifiedMember |
Insurance loss recoverable | (533,000,000)mbi_InsuranceLossRecoverable / mbi_ClaimLiabilityAxis = mbi_InsuranceLossRecoverableMember / mbi_ClassifiedStatusAxis = mbi_ClassifiedMember | (694,000,000)mbi_InsuranceLossRecoverable / mbi_ClaimLiabilityAxis = mbi_InsuranceLossRecoverableMember / mbi_ClassifiedStatusAxis = mbi_ClassifiedMember |
Reinsurance recoverable on unpaid losses | 6,000,000 us-gaap_ReinsuranceReceivablesIncurredButNotReportedClaims / mbi_ClaimLiabilityAxis = mbi_InsuranceLossRecoverableMember / mbi_ClassifiedStatusAxis = mbi_ClassifiedMember | 7,000,000 us-gaap_ReinsuranceReceivablesIncurredButNotReportedClaims / mbi_ClaimLiabilityAxis = mbi_InsuranceLossRecoverableMember / mbi_ClassifiedStatusAxis = mbi_ClassifiedMember |
Reinsurance recoverable on unpaid LAE | 1,000,000 mbi_ReinsuranceRecoverableOnUnpaidLossAdjustmentExpenses / mbi_ClaimLiabilityAxis = mbi_InsuranceLossRecoverableMember / mbi_ClassifiedStatusAxis = mbi_ClassifiedMember | 1,000,000 mbi_ReinsuranceRecoverableOnUnpaidLossAdjustmentExpenses / mbi_ClaimLiabilityAxis = mbi_InsuranceLossRecoverableMember / mbi_ClassifiedStatusAxis = mbi_ClassifiedMember |
Reinsurance recoverable on paid losses | 0 us-gaap_ReinsuranceReceivablesPaidLossesRecoverable / mbi_ClaimLiabilityAxis = mbi_InsuranceLossRecoverableMember / mbi_ClassifiedStatusAxis = mbi_ClassifiedMember | 0 us-gaap_ReinsuranceReceivablesPaidLossesRecoverable / mbi_ClaimLiabilityAxis = mbi_InsuranceLossRecoverableMember / mbi_ClassifiedStatusAxis = mbi_ClassifiedMember |
Reinsurance recoverable on paid and unpaid losses | $ 7,000,000 us-gaap_ReinsuranceReceivablesCaseBasis / mbi_ClaimLiabilityAxis = mbi_InsuranceLossRecoverableMember / mbi_ClassifiedStatusAxis = mbi_ClassifiedMember | $ 8,000,000 us-gaap_ReinsuranceReceivablesCaseBasis / mbi_ClaimLiabilityAxis = mbi_InsuranceLossRecoverableMember / mbi_ClassifiedStatusAxis = mbi_ClassifiedMember |

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- Definition Carrying amount as of the balance sheet date of paid insurance policy claims and LAE expense expected to be recovered. + References No definition available. + Details
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- Definition Carrying amount as of the balance sheet date of paid LAE expenses expected to be recovered. + References No definition available. + Details
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- Definition Reinsurance Recoverable On Unpaid LAE + References No definition available. + Details
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- Definition Carrying amount as of the balance sheet date of amounts expected to be recovered under the terms of insurance contracts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 17 -Article 5 + Details
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- Definition The amount needed to reflect the estimated ultimate cost of settling claims relating to insured events that have occurred on or before the balance sheet date, whether or not reported to the insurer at that date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (a),(b),(c) -URI http://asc.fasb.org/extlink&oid=6482485&loc=d3e14764-158437 + Details
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- Definition The sum for all reinsurance arrangements of the known and estimated amount recoverable as of the balance sheet date from a given reinsurer for claims paid or incurred by the ceding insurer and associated claims settlement expenses for each reinsurance arrangement (or, the sum of all cases determined individually, probably applying different assumptions to each arrangement). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 310 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6485522&loc=d3e21412-158489 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 310 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6485522&loc=d3e21409-158489 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.6) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 6 -Article 7 + Details
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- Definition Estimated amount after valuation allowance of reinsurance recoverables, due from reinsurers for incurred claims not yet reported, and claims settlement expenses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 310 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6485522&loc=d3e21412-158489 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 310 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6485522&loc=d3e21409-158489 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 6 -Article 7 + Details
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- Definition Amount after valuation allowance currently billed or billable under reinsurance contracts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 310 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6485522&loc=d3e21412-158489 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 310 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6485522&loc=d3e21409-158489 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.6) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 6 -Article 7 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 605 -Section 50 -Paragraph 1 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=6486672&loc=d3e27261-158547 + Details
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- Details
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