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Insurance In Force (Summary Of Company's Reinsurance Agreements For U.S. Public Finance And Structured Finance And International Insurance Operations) (Detail) (USD $) In Millions, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Aggregate Amount Of Insured Par Outstanding Ceded To Reinsurers | $ 6,087 mbi_AggregateAmountOfInsuredParOutstandingCededToReinsurers |  | $ 7,100 mbi_AggregateAmountOfInsuredParOutstandingCededToReinsurers
Reinsurance Recoverables Secured By Letters Of Credit Amount | 34 mbi_ReinsuranceRecoverablesSecuredByLettersOfCreditAmount |  |
Reinsurance Recoverable | 7 us-gaap_ReinsuranceRecoverables | [1] |
Moody's Aaa [Member] | S&P AA+ [Member] | Overseas Private Investment Corporation [Member] |  |  |
Aggregate Amount Of Insured Par Outstanding Ceded To Reinsurers | 289 mbi_AggregateAmountOfInsuredParOutstandingCededToReinsurers / us-gaap_CededCreditRiskAxis = mbi_OverseasPrivateInvestmentCorporationMember / us-gaap_CreditRatingMoodysAxis = us-gaap_MoodysAaaRatingMember / us-gaap_CreditRatingStandardPoorsAxis = us-gaap_StandardPoorsAAPlusRatingMember |  |
Moody's A2 or above [Member] | S&P A- or above [Member] | Others [Member] |  |  |
Aggregate Amount Of Insured Par Outstanding Ceded To Reinsurers | 145 mbi_AggregateAmountOfInsuredParOutstandingCededToReinsurers / us-gaap_CededCreditRiskAxis = mbi_OtherReinsurersMember / us-gaap_CreditRatingMoodysAxis = mbi_Moodysa2OrAboveRatingMember / us-gaap_CreditRatingStandardPoorsAxis = mbi_StandardpoorsaminusoraboveratingmemberMember |  |
Reinsurance Recoverables Secured By Letters Of Credit Amount | 2 mbi_ReinsuranceRecoverablesSecuredByLettersOfCreditAmount / us-gaap_CededCreditRiskAxis = mbi_OtherReinsurersMember / us-gaap_CreditRatingMoodysAxis = mbi_Moodysa2OrAboveRatingMember / us-gaap_CreditRatingStandardPoorsAxis = mbi_StandardpoorsaminusoraboveratingmemberMember |  |
Mood'ys A3 Rating [Member] | S&P AA [Member] | Assured Guaranty Corp [Member] |  |  |
Aggregate Amount Of Insured Par Outstanding Ceded To Reinsurers | 2,019 mbi_AggregateAmountOfInsuredParOutstandingCededToReinsurers / us-gaap_CededCreditRiskAxis = mbi_AssuredGuarantyCorpMember / us-gaap_CreditRatingMoodysAxis = us-gaap_MoodysA3RatingMember / us-gaap_CreditRatingStandardPoorsAxis = us-gaap_StandardPoorsAARatingMember |  |
Reinsurance Recoverable | 6 us-gaap_ReinsuranceRecoverables / us-gaap_CededCreditRiskAxis = mbi_AssuredGuarantyCorpMember / us-gaap_CreditRatingMoodysAxis = us-gaap_MoodysA3RatingMember / us-gaap_CreditRatingStandardPoorsAxis = us-gaap_StandardPoorsAARatingMember | [1] |
Moody's Baa 1 Rating [Member] | S&P AA [Member] | Assured Guaranty Re Ltd [Member] |  |  |
Aggregate Amount Of Insured Par Outstanding Ceded To Reinsurers | 3,634 mbi_AggregateAmountOfInsuredParOutstandingCededToReinsurers / us-gaap_CededCreditRiskAxis = mbi_AssuredGuarantyReLtdMember / us-gaap_CreditRatingMoodysAxis = us-gaap_MoodysBaa1RatingMember / us-gaap_CreditRatingStandardPoorsAxis = us-gaap_StandardPoorsAARatingMember |  |
Reinsurance Recoverables Secured By Letters Of Credit Amount | 32 mbi_ReinsuranceRecoverablesSecuredByLettersOfCreditAmount / us-gaap_CededCreditRiskAxis = mbi_AssuredGuarantyReLtdMember / us-gaap_CreditRatingMoodysAxis = us-gaap_MoodysBaa1RatingMember / us-gaap_CreditRatingStandardPoorsAxis = us-gaap_StandardPoorsAARatingMember |  |
Reinsurance Recoverable | $ 1 us-gaap_ReinsuranceRecoverables / us-gaap_CededCreditRiskAxis = mbi_AssuredGuarantyReLtdMember / us-gaap_CreditRatingMoodysAxis = us-gaap_MoodysBaa1RatingMember / us-gaap_CreditRatingStandardPoorsAxis = us-gaap_StandardPoorsAARatingMember | [1] |
[1] | Total reinsurance recoverable is primarily related to recoverables on unpaid losses.

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- Definition Amount after valuation allowance recoverable including premium paid under reinsurance contracts. Examples include, but are not limited to, settled and unsettled claims, incurred but not reported losses, loss adjustment expense, premium paid, policy benefits and policy reserves. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 6 -Article 7 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 20 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6480758&loc=d3e6824-158387 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.(a),6) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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