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v2.4.1.9

Insurance in Force (Schedule Of Geographical Distribution Of Insurance In Force) (Detail) (USD $) In Billions, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Insurance in Force | $ 437.8 us-gaap_ParticipatingPoliciesAmountInForce | $ 554.3 us-gaap_ParticipatingPoliciesAmountInForce
% of Insurance in Force | 100.00%us-gaap_ParticipatingPoliciesAsPercentageOfGrossInsuranceInForce | 100.00%us-gaap_ParticipatingPoliciesAsPercentageOfGrossInsuranceInForce
California [Member] |  |
Insurance in Force | 73.8 us-gaap_ParticipatingPoliciesAmountInForce / us-gaap_StatementGeographicalAxis = stpr_CA | 88.7 us-gaap_ParticipatingPoliciesAmountInForce / us-gaap_StatementGeographicalAxis = stpr_CA
% of Insurance in Force | 16.90%us-gaap_ParticipatingPoliciesAsPercentageOfGrossInsuranceInForce / us-gaap_StatementGeographicalAxis = stpr_CA | 16.00%us-gaap_ParticipatingPoliciesAsPercentageOfGrossInsuranceInForce / us-gaap_StatementGeographicalAxis = stpr_CA
New York [Member] |  |
Insurance in Force | 29.8 us-gaap_ParticipatingPoliciesAmountInForce / us-gaap_StatementGeographicalAxis = stpr_NY | 38.1 us-gaap_ParticipatingPoliciesAmountInForce / us-gaap_StatementGeographicalAxis = stpr_NY
% of Insurance in Force | 6.80%us-gaap_ParticipatingPoliciesAsPercentageOfGrossInsuranceInForce / us-gaap_StatementGeographicalAxis = stpr_NY | 6.90%us-gaap_ParticipatingPoliciesAsPercentageOfGrossInsuranceInForce / us-gaap_StatementGeographicalAxis = stpr_NY
Illinois [Member] |  |
Insurance in Force | 25.4 us-gaap_ParticipatingPoliciesAmountInForce / us-gaap_StatementGeographicalAxis = stpr_IL | 29.6 us-gaap_ParticipatingPoliciesAmountInForce / us-gaap_StatementGeographicalAxis = stpr_IL
% of Insurance in Force | 5.80%us-gaap_ParticipatingPoliciesAsPercentageOfGrossInsuranceInForce / us-gaap_StatementGeographicalAxis = stpr_IL | 5.30%us-gaap_ParticipatingPoliciesAsPercentageOfGrossInsuranceInForce / us-gaap_StatementGeographicalAxis = stpr_IL
Florida [Member] |  |
Insurance in Force | 24.1 us-gaap_ParticipatingPoliciesAmountInForce / us-gaap_StatementGeographicalAxis = stpr_FL | 29.2 us-gaap_ParticipatingPoliciesAmountInForce / us-gaap_StatementGeographicalAxis = stpr_FL
% of Insurance in Force | 5.50%us-gaap_ParticipatingPoliciesAsPercentageOfGrossInsuranceInForce / us-gaap_StatementGeographicalAxis = stpr_FL | 5.30%us-gaap_ParticipatingPoliciesAsPercentageOfGrossInsuranceInForce / us-gaap_StatementGeographicalAxis = stpr_FL
Texas [Member] |  |
Insurance in Force | 21.1 us-gaap_ParticipatingPoliciesAmountInForce / us-gaap_StatementGeographicalAxis = stpr_TX | 28.0 us-gaap_ParticipatingPoliciesAmountInForce / us-gaap_StatementGeographicalAxis = stpr_TX
% of Insurance in Force | 4.80%us-gaap_ParticipatingPoliciesAsPercentageOfGrossInsuranceInForce / us-gaap_StatementGeographicalAxis = stpr_TX | 5.00%us-gaap_ParticipatingPoliciesAsPercentageOfGrossInsuranceInForce / us-gaap_StatementGeographicalAxis = stpr_TX
New Jersey [Member] |  |
Insurance in Force | 16.8 us-gaap_ParticipatingPoliciesAmountInForce / us-gaap_StatementGeographicalAxis = stpr_NJ | 20.2 us-gaap_ParticipatingPoliciesAmountInForce / us-gaap_StatementGeographicalAxis = stpr_NJ
% of Insurance in Force | 3.90%us-gaap_ParticipatingPoliciesAsPercentageOfGrossInsuranceInForce / us-gaap_StatementGeographicalAxis = stpr_NJ | 3.60%us-gaap_ParticipatingPoliciesAsPercentageOfGrossInsuranceInForce / us-gaap_StatementGeographicalAxis = stpr_NJ
Michigan [Member] |  |
Insurance in Force | 12.3 us-gaap_ParticipatingPoliciesAmountInForce / us-gaap_StatementGeographicalAxis = stpr_MI | 15.3 us-gaap_ParticipatingPoliciesAmountInForce / us-gaap_StatementGeographicalAxis = stpr_MI
% of Insurance in Force | 2.80%us-gaap_ParticipatingPoliciesAsPercentageOfGrossInsuranceInForce / us-gaap_StatementGeographicalAxis = stpr_MI | 2.80%us-gaap_ParticipatingPoliciesAsPercentageOfGrossInsuranceInForce / us-gaap_StatementGeographicalAxis = stpr_MI
Pennsylvania [Member] |  |
Insurance in Force | 9.3 us-gaap_ParticipatingPoliciesAmountInForce / us-gaap_StatementGeographicalAxis = stpr_PA | 11.8 us-gaap_ParticipatingPoliciesAmountInForce / us-gaap_StatementGeographicalAxis = stpr_PA
% of Insurance in Force | 2.30%us-gaap_ParticipatingPoliciesAsPercentageOfGrossInsuranceInForce / us-gaap_StatementGeographicalAxis = stpr_PA | 2.10%us-gaap_ParticipatingPoliciesAsPercentageOfGrossInsuranceInForce / us-gaap_StatementGeographicalAxis = stpr_PA
Washington [Member] |  |
Insurance in Force | 9.1 us-gaap_ParticipatingPoliciesAmountInForce / us-gaap_StatementGeographicalAxis = stpr_WA | 11.5 us-gaap_ParticipatingPoliciesAmountInForce / us-gaap_StatementGeographicalAxis = stpr_WA
% of Insurance in Force | 2.10%us-gaap_ParticipatingPoliciesAsPercentageOfGrossInsuranceInForce / us-gaap_StatementGeographicalAxis = stpr_WA | 2.10%us-gaap_ParticipatingPoliciesAsPercentageOfGrossInsuranceInForce / us-gaap_StatementGeographicalAxis = stpr_WA
Puerto Rico [Member] |  |
Insurance in Force | 10.1 us-gaap_ParticipatingPoliciesAmountInForce / us-gaap_StatementGeographicalAxis = country_PR | 10.9 us-gaap_ParticipatingPoliciesAmountInForce / us-gaap_StatementGeographicalAxis = country_PR
% of Insurance in Force | 2.10%us-gaap_ParticipatingPoliciesAsPercentageOfGrossInsuranceInForce / us-gaap_StatementGeographicalAxis = country_PR | 2.00%us-gaap_ParticipatingPoliciesAsPercentageOfGrossInsuranceInForce / us-gaap_StatementGeographicalAxis = country_PR
Sub-Total Insurance In Force [Member] |  |
Insurance in Force | 231.8 us-gaap_ParticipatingPoliciesAmountInForce / us-gaap_StatementGeographicalAxis = mbi_SubTotalInsuranceInForceMember | 283.3 us-gaap_ParticipatingPoliciesAmountInForce / us-gaap_StatementGeographicalAxis = mbi_SubTotalInsuranceInForceMember
% of Insurance in Force | 53.00%us-gaap_ParticipatingPoliciesAsPercentageOfGrossInsuranceInForce / us-gaap_StatementGeographicalAxis = mbi_SubTotalInsuranceInForceMember | 51.10%us-gaap_ParticipatingPoliciesAsPercentageOfGrossInsuranceInForce / us-gaap_StatementGeographicalAxis = mbi_SubTotalInsuranceInForceMember
Nationally Diversified [Member] |  |
Insurance in Force | 38.9 us-gaap_ParticipatingPoliciesAmountInForce / us-gaap_StatementGeographicalAxis = mbi_NationallyDiversifiedMember | 53.6 us-gaap_ParticipatingPoliciesAmountInForce / us-gaap_StatementGeographicalAxis = mbi_NationallyDiversifiedMember
% of Insurance in Force | 8.90%us-gaap_ParticipatingPoliciesAsPercentageOfGrossInsuranceInForce / us-gaap_StatementGeographicalAxis = mbi_NationallyDiversifiedMember | 9.70%us-gaap_ParticipatingPoliciesAsPercentageOfGrossInsuranceInForce / us-gaap_StatementGeographicalAxis = mbi_NationallyDiversifiedMember
Other States [Member] |  |
Insurance in Force | 123.6 us-gaap_ParticipatingPoliciesAmountInForce / us-gaap_StatementGeographicalAxis = mbi_OtherStatesMember | 155.8 us-gaap_ParticipatingPoliciesAmountInForce / us-gaap_StatementGeographicalAxis = mbi_OtherStatesMember
% of Insurance in Force | 28.20%us-gaap_ParticipatingPoliciesAsPercentageOfGrossInsuranceInForce / us-gaap_StatementGeographicalAxis = mbi_OtherStatesMember | 28.10%us-gaap_ParticipatingPoliciesAsPercentageOfGrossInsuranceInForce / us-gaap_StatementGeographicalAxis = mbi_OtherStatesMember
United States [Member] |  |
Insurance in Force | 394.3 us-gaap_ParticipatingPoliciesAmountInForce / us-gaap_StatementGeographicalAxis = country_US | 492.7 us-gaap_ParticipatingPoliciesAmountInForce / us-gaap_StatementGeographicalAxis = country_US
% of Insurance in Force | 90.10%us-gaap_ParticipatingPoliciesAsPercentageOfGrossInsuranceInForce / us-gaap_StatementGeographicalAxis = country_US | 88.90%us-gaap_ParticipatingPoliciesAsPercentageOfGrossInsuranceInForce / us-gaap_StatementGeographicalAxis = country_US
Internationally Diversified [Member] |  |
Insurance in Force | 2.8 us-gaap_ParticipatingPoliciesAmountInForce / us-gaap_StatementGeographicalAxis = mbi_InternationallyDiversifiedMember | 12.8 us-gaap_ParticipatingPoliciesAmountInForce / us-gaap_StatementGeographicalAxis = mbi_InternationallyDiversifiedMember
% of Insurance in Force | 0.60%us-gaap_ParticipatingPoliciesAsPercentageOfGrossInsuranceInForce / us-gaap_StatementGeographicalAxis = mbi_InternationallyDiversifiedMember | 2.30%us-gaap_ParticipatingPoliciesAsPercentageOfGrossInsuranceInForce / us-gaap_StatementGeographicalAxis = mbi_InternationallyDiversifiedMember
Country Specific [Member] |  |
Insurance in Force | 40.7 us-gaap_ParticipatingPoliciesAmountInForce / us-gaap_StatementGeographicalAxis = mbi_CountrySpecificMember | 48.8 us-gaap_ParticipatingPoliciesAmountInForce / us-gaap_StatementGeographicalAxis = mbi_CountrySpecificMember
% of Insurance in Force | 9.30%us-gaap_ParticipatingPoliciesAsPercentageOfGrossInsuranceInForce / us-gaap_StatementGeographicalAxis = mbi_CountrySpecificMember | 8.80%us-gaap_ParticipatingPoliciesAsPercentageOfGrossInsuranceInForce / us-gaap_StatementGeographicalAxis = mbi_CountrySpecificMember
Non-United States [Member] |  |
Insurance in Force | $ 43.5 us-gaap_ParticipatingPoliciesAmountInForce / us-gaap_StatementGeographicalAxis = mbi_NonUnitedStatesMember | $ 61.6 us-gaap_ParticipatingPoliciesAmountInForce / us-gaap_StatementGeographicalAxis = mbi_NonUnitedStatesMember
% of Insurance in Force | 9.90%us-gaap_ParticipatingPoliciesAsPercentageOfGrossInsuranceInForce / us-gaap_StatementGeographicalAxis = mbi_NonUnitedStatesMember | 11.10%us-gaap_ParticipatingPoliciesAsPercentageOfGrossInsuranceInForce / us-gaap_StatementGeographicalAxis = mbi_NonUnitedStatesMember

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- Definition The amount as of the balance sheet date of the participating business in force. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 50 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6483535&loc=d3e16392-158451 + Details
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Balance Type: | credit
Period Type: | instant

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- Definition This percent places participating policies in the numerator and insurance contracts in force in the denominator. Participating insurance contracts allow policyholders to share in the experience of the entity, primarily through policy dividends. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.14(b)(1)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 50 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6483535&loc=d3e16392-158451 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 14 -Subparagraph b -Article 7 + Details
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