XML 76 R61.htm IDEA: XBRL DOCUMENT
v3.3.1.900

Insurance Premiums (Unearned Premium Revenue Balance And Future Expected Earnings) (Detail) $ in Millions | Dec. 31, 2015 USD ($)
--- | ---
Insurance Premiums [Line Items] |
Three months ending, March 31, 2016, Total Expected Future Premium Earnings | $ 47
Three months ending, June 30, 2016, Total Expected Future Premium Earnings | 47
Three months ending, September 30, 2016, Total Expected Future Premium Earnings | 45
Three months ending, December 31, 2016, Total Expected Future Premium Earnings | 44
Twelve months ending, December 31, 2017, Total Expected Future Premium Earnings | 162
Twelve months ending, December 31, 2018, Total Expected Future Premium Earnings | 149
Twelve months ending, December 31, 2019, Total Expected Future Premium Earnings | 138
Twelve months ending, December 31, 2020, Total Expected Future Premium Earnings | 128
Five years ending, December 31, 2025, Total Expected Future Premium Earnings | 486
Five years ending, December 31, 2030, Total Expected Future Premium Earnings | 287
Five years ending, December 31, 2035 and thereafter, Total Expected Future Premium Earnings | 254
Total Expected Future Premium Earnings | 1,787
Unearned Premium Revenue [Member] |
Insurance Premiums [Line Items] |
Unearned Premiums | 1,591
Unearned Premium Revenue [Member] | March Thirty One Two Thousand Sixteen [Member] |
Insurance Premiums [Line Items] |
Unearned Premiums | 1,549
Unearned Premium Revenue [Member] | June Thirty Two Thousand Sixteen [Member] |
Insurance Premiums [Line Items] |
Unearned Premiums | 1,507
Unearned Premium Revenue [Member] | September Thirty Two Thousand Sixteen [Member] |
Insurance Premiums [Line Items] |
Unearned Premiums | 1,467
Unearned Premium Revenue [Member] | December Thirty One Two Thousand Sixteen [Member] |
Insurance Premiums [Line Items] |
Unearned Premiums | 1,428
Unearned Premium Revenue [Member] | December Thirty One Two Thousand Seventeen [Member] |
Insurance Premiums [Line Items] |
Unearned Premiums | 1,284
Unearned Premium Revenue [Member] | December Thirty One Two Thousand Eighteen [Member] |
Insurance Premiums [Line Items] |
Unearned Premiums | 1,151
Unearned Premium Revenue [Member] | December Thirty One Two Thousand Nineteen [Member] |
Insurance Premiums [Line Items] |
Unearned Premiums | 1,028
Unearned Premium Revenue [Member] | December Thirty One Two Thousand Twenty [Member] |
Insurance Premiums [Line Items] |
Unearned Premiums | 914
Unearned Premium Revenue [Member] | December Thirty One Two Thousand Twenty Five [Member] |
Insurance Premiums [Line Items] |
Unearned Premiums | 481
Unearned Premium Revenue [Member] | December Thirty One Two Thousand Thirty [Member] |
Insurance Premiums [Line Items] |
Unearned Premiums | 224
Unearned Premium Revenue [Member] | December Thirty One Two Thousand Thirty Five And Thereafter [Member] |
Insurance Premiums [Line Items] |
Unearned Premiums | 0
Upfront [Member] |
Insurance Premiums [Line Items] |
Three months ending, March 31, 2016, Total Expected Future Premium Earnings | 22
Three months ending, June 30, 2016, Total Expected Future Premium Earnings | 22
Three months ending, September 30, 2016, Total Expected Future Premium Earnings | 21
Three months ending, December 31, 2016, Total Expected Future Premium Earnings | 20
Twelve months ending, December 31, 2017, Total Expected Future Premium Earnings | 77
Twelve months ending, December 31, 2018, Total Expected Future Premium Earnings | 70
Twelve months ending, December 31, 2019, Total Expected Future Premium Earnings | 64
Twelve months ending, December 31, 2020, Total Expected Future Premium Earnings | 58
Five years ending, December 31, 2025, Total Expected Future Premium Earnings | 217
Five years ending, December 31, 2030, Total Expected Future Premium Earnings | 123
Five years ending, December 31, 2035 and thereafter, Total Expected Future Premium Earnings | 108
Total Expected Future Premium Earnings | 802
Installments [Member] |
Insurance Premiums [Line Items] |
Three months ending, March 31, 2016, Total Expected Future Premium Earnings | 20
Three months ending, June 30, 2016, Total Expected Future Premium Earnings | 20
Three months ending, September 30, 2016, Total Expected Future Premium Earnings | 19
Three months ending, December 31, 2016, Total Expected Future Premium Earnings | 19
Twelve months ending, December 31, 2017, Total Expected Future Premium Earnings | 67
Twelve months ending, December 31, 2018, Total Expected Future Premium Earnings | 63
Twelve months ending, December 31, 2019, Total Expected Future Premium Earnings | 59
Twelve months ending, December 31, 2020, Total Expected Future Premium Earnings | 56
Five years ending, December 31, 2025, Total Expected Future Premium Earnings | 216
Five years ending, December 31, 2030, Total Expected Future Premium Earnings | 134
Five years ending, December 31, 2035 and thereafter, Total Expected Future Premium Earnings | 116
Total Expected Future Premium Earnings | 789
Accretion [Member] |
Insurance Premiums [Line Items] |
Three months ending, March 31, 2016, Total Expected Future Premium Earnings | 5
Three months ending, June 30, 2016, Total Expected Future Premium Earnings | 5
Three months ending, September 30, 2016, Total Expected Future Premium Earnings | 5
Three months ending, December 31, 2016, Total Expected Future Premium Earnings | 5
Twelve months ending, December 31, 2017, Total Expected Future Premium Earnings | 18
Twelve months ending, December 31, 2018, Total Expected Future Premium Earnings | 16
Twelve months ending, December 31, 2019, Total Expected Future Premium Earnings | 15
Twelve months ending, December 31, 2020, Total Expected Future Premium Earnings | 14
Five years ending, December 31, 2025, Total Expected Future Premium Earnings | 53
Five years ending, December 31, 2030, Total Expected Future Premium Earnings | 30
Five years ending, December 31, 2035 and thereafter, Total Expected Future Premium Earnings | 30
Total Expected Future Premium Earnings | $ 196

X
- Definition Financial guarantee insurance contracts, the amount of premium revenue expected to be recognized during the eleventh through fifteenth year following the statement of financial position reporting date + References No definition available. + Details
Name: | mbi_FinancialGuaranteeInsuranceContractsFutureExpectedPremiumRevenueToBeRecognizedDuringEleventhThroughFifteenthYearFollowingBalanceSheetDate
Namespace Prefix: | mbi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Financial guarantee insurance contracts, the amount of premium revenue expected to be recognized during the sixteenth year and thereafter following the statement of financial position reporting date. + References No definition available. + Details
Name: | mbi_FinancialGuaranteeInsuranceContractsFutureExpectedPremiumRevenueToBeRecognizedDuringSixteenthYearAndThereafterFollowingBalanceSheetDate
Namespace Prefix: | mbi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Financial guarantee insurance contracts, the amount of premium revenue expected to be recognized during the sixth through tenth year following the statement of financial position reporting date + References No definition available. + Details
Name: | mbi_FinancialGuaranteeInsuranceContractsFutureExpectedPremiumRevenueToBeRecognizedDuringSixthThroughTenthYearFollowingBalanceSheetDate
Namespace Prefix: | mbi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Insurance Premiums Line Items + References No definition available. + Details
Name: | mbi_InsurancePremiumsLineItems
Namespace Prefix: | mbi_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of unearned premium revenue under contracts issued by an insurance entity that provide protection to the holder of a financial obligation from a financial loss in the event of a default. + References No definition available. + Details
Name: | us-gaap_FinancialGuaranteeInsuranceContractsFutureExpectedPremiumRevenueToBeRecognized
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of premium revenue under financial guarantee insurance contracts expected to be recognized in the next fiscal quarter following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 605 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=6933581&loc=SL5749298-161291 + Details
Name: | us-gaap_FinancialGuaranteeInsuranceContractsFutureExpectedPremiumRevenueToBeRecognizedDuringFirstQuarterFollowingBalanceSheetDate
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of premium revenue under financial guarantee insurance contracts expected to be recognized in the fourth fiscal quarter following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 605 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=6933581&loc=SL5749298-161291 + Details
Name: | us-gaap_FinancialGuaranteeInsuranceContractsFutureExpectedPremiumRevenueToBeRecognizedDuringFourthQuarterFollowingBalanceSheetDate
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of premium revenue under financial guarantee insurance contracts expected to be recognized in the second fiscal quarter following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 605 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=6933581&loc=SL5749298-161291 + Details
Name: | us-gaap_FinancialGuaranteeInsuranceContractsFutureExpectedPremiumRevenueToBeRecognizedDuringSecondQuarterFollowingBalanceSheetDate
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of premium revenue under financial guarantee insurance contracts expected to be recognized in the third fiscal quarter following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 605 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=6933581&loc=SL5749298-161291 + Details
Name: | us-gaap_FinancialGuaranteeInsuranceContractsFutureExpectedPremiumRevenueToBeRecognizedDuringThirdQuarterFollowingBalanceSheetDate
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of premium revenue under financial guarantee insurance contracts expected to be recognized in the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 605 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=6933581&loc=SL5749298-161291 + Details
Name: | us-gaap_FinancialGuaranteeInsuranceContractsFutureExpectedPremiumRevenueToBeRecognizedMoreThanFourAndWithinFiveYearsFromBalanceSheetDate
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of premium revenue under financial guarantee insurance contracts expected to be recognized in the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 605 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=6933581&loc=SL5749298-161291 + Details
Name: | us-gaap_FinancialGuaranteeInsuranceContractsFutureExpectedPremiumRevenueToBeRecognizedMoreThanOneAndWithinTwoYearsFromBalanceSheetDate
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of premium revenue under financial guarantee insurance contracts expected to be recognized in the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 605 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=6933581&loc=SL5749298-161291 + Details
Name: | us-gaap_FinancialGuaranteeInsuranceContractsFutureExpectedPremiumRevenueToBeRecognizedMoreThanThreeAndWithinFourYearsFromBalanceSheetDate
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of premium revenue under financial guarantee insurance contracts expected to be recognized in the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 605 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=6933581&loc=SL5749298-161291 + Details
Name: | us-gaap_FinancialGuaranteeInsuranceContractsFutureExpectedPremiumRevenueToBeRecognizedMoreThanTwoAndWithinThreeYearsFromBalanceSheetDate
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Carrying amount of premiums written on insurance contracts that have not been earned as of the balance sheet date. + 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.(a),13(a)(2)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 13 -Subparagraph a(2) -Article 7 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 16 -Article 12 + Details
Name: | us-gaap_UnearnedPremiums
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | us-gaap_DeferredRevenueArrangementTypeAxis=mbi_UnearnedPremiumRevenueMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementScenarioAxis=mbi_MarchThirtyOneTwoThousandFifteenMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementScenarioAxis=mbi_JuneThirtyTwoThousandFifeteenMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementScenarioAxis=mbi_SeptemberThirtyTwoThousandFifeteenMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementScenarioAxis=mbi_DecemberThirtyOneTwoThousandFifeteenMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementScenarioAxis=mbi_DecemberThirtyOneTwoThousandSixteenrMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementScenarioAxis=mbi_DecemberThirtyOneTwoThousandSeventeenMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementScenarioAxis=mbi_DecemberThirtyOneTwoThousandEighteenMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementScenarioAxis=mbi_DecemberThirtyOneTwoThousandTwentyNineteenMemberMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementScenarioAxis=mbi_DecemberThirtyOneTwoThousandTwentyFourMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementScenarioAxis=mbi_DecemberThirtyOneTwoThousandTwentyNineMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementScenarioAxis=mbi_DecemberThirtyOneTwoThousandThirtyFourAndThereafterMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DeferredRevenueArrangementTypeAxis=mbi_UpfrontMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DeferredRevenueArrangementTypeAxis=mbi_InstallmentsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DeferredRevenueArrangementTypeAxis=mbi_AccretionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |