XML 110 R99.htm IDEA: XBRL DOCUMENT
v3.25.0.1

Insurance In Force (Schedule Of Insurance In Force By Type Of Bond, Excluding Transactions Guaranteed By MBIA Corp. On Behalf Of Various Investment Management Services And Other Affiliated Companies) (Detail) - USD ($) $ in Billions | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Insurance in Force |  | $ 54.3 | $ 60.9
Gross Par Amount |  | 27.6 | 31.2
U S [Member] |  |  |
Insurance in Force |  | 52.3 | 58.4
Non-United States [Member] |  |  |
Insurance in Force |  | 2.0 | 2.5
Transportation [Member] | Non-United States [Member] |  |  |
Insurance in Force |  | 0.3 | 0.4
Gross Par Amount |  | 0.2 | 0.4
Other Public Finance [Member] | Non-United States [Member] |  |  |
Insurance in Force | [1] | 0.1 | 0.1
Gross Par Amount | [1] | 0.1 | 0.1
Sovereign Related And Sub-Sovereign [Member] | Non-United States [Member] |  |  |
Insurance in Force | [2] | 1.1 | 1.3
Gross Par Amount | [2] | 0.9 | 1.0
Global Public Finance [Member] |  |  |
Insurance in Force |  | 52.7 | 58.9
Gross Par Amount |  | 26.5 | 29.8
Global Public Finance [Member] | U S [Member] |  |  |
Insurance in Force |  | 51.2 | 57.1
Gross Par Amount |  | 25.3 | 28.3
Global Public Finance [Member] | Non-United States [Member] |  |  |
Insurance in Force |  | 1.5 | 1.8
Gross Par Amount |  | 1.2 | 1.5
Global Public Finance [Member] | General Obligation [Member] | U S [Member] |  |  |
Insurance in Force | [3] | 14.6 | 16.8
Gross Par Amount | [3] | 7.0 | 8.0
Global Public Finance [Member] | General Obligation—Lease [Member] | U S [Member] |  |  |
Insurance in Force |  | 0.8 | 1.0
Gross Par Amount |  | 0.5 | 0.7
Global Public Finance [Member] | Municipal Utilities [Member] | U S [Member] |  |  |
Insurance in Force |  | 5.4 | 6.4
Gross Par Amount |  | 3.9 | 4.6
Global Public Finance [Member] | Tax-Backed [Member] | U S [Member] |  |  |
Insurance in Force |  | 9.8 | 11.0
Gross Par Amount |  | 4.2 | 4.9
Global Public Finance [Member] | Transportation [Member] | U S [Member] |  |  |
Insurance in Force |  | 6.1 | 6.5
Gross Par Amount |  | 1.9 | 2.1
Global Public Finance [Member] | Higher Education [Member] | U S [Member] |  |  |
Insurance in Force |  | 0.8 | 1.0
Gross Par Amount |  | 0.6 | 0.7
Global Public Finance [Member] | Health Care [Member] | U S [Member] |  |  |
Insurance in Force |  | 0.6 | 0.7
Gross Par Amount |  | 0.4 | 0.4
Global Public Finance [Member] | Military Housing [Member] | U S [Member] |  |  |
Insurance in Force |  | 12.7 | 13.2
Gross Par Amount |  | 6.5 | 6.6
Global Public Finance [Member] | Investor-Owned Utilities [Member] | U S [Member] |  |  |
Insurance in Force | [4] | 0.4 | 0.4
Gross Par Amount | [4] | 0.3 | 0.3
Global Public Finance [Member] | Other Public Finance [Member] | U S [Member] |  |  |
Insurance in Force | [5] | 0.0 | 0.1
Gross Par Amount | [5] | 0.0 | 0.0
Global Structured Finance [Member] |  |  |
Insurance in Force |  | 1.6 | 2.0
Gross Par Amount |  | 1.1 | 1.4
Global Structured Finance [Member] | Collateralized Debt Obligations [Member] |  |  |
Insurance in Force |  | 0.0 | 0.1
Gross Par Amount |  | 0.0 | 0.1
Global Structured Finance [Member] | Residential Mortgage Backed Securities [Member] |  |  |
Insurance in Force |  | 0.8 | 0.9
Gross Par Amount |  | 0.5 | 0.6
Global Structured Finance [Member] | Commercial Mortgage-Backed [Member] |  |  |
Insurance in Force |  | 0.3 | 0.4
Gross Par Amount |  | 0.1 | 0.2
Global Structured Finance [Member] | Consumer Asset Backed [Member] |  |  |
Insurance in Force |  | 0.1 | 0.1
Gross Par Amount |  | 0.1 | 0.1
Global Structured Finance [Member] | Corporate Asset Backed [Member] |  |  |
Insurance in Force |  | 0.4 | 0.5
Gross Par Amount |  | $ 0.4 | $ 0.4
[1] | Includes municipal owned entities backed by sponsoring local government, tax backed and utility transactions.
[2] | Includes regions, departments or their equivalent in each jurisdiction as well as sovereign owned entities that are supported by a sovereign state, region or department.
[3] | Includes general obligation unlimited and limited (property) tax bonds, general fund obligation bonds and pension obligation bonds of states, cities, counties, schools and special districts
[4] | Includes investor owned utilities, industrial development and pollution control revenue bonds.
[5] | Includes stadium related financings, municipal housing and certain non-profit enterprises.

X
- Definition Represents the amount of insured contractual payments (principal and interest) outstanding on the underlying insured obligations for financial guaranty contracts, gross of ceded contracts. + References No definition available. + Details
Name: | mbi_InsuredFinancialObligationsInsuredContractualPaymentsOutstandingGross
Namespace Prefix: | mbi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Represents the outstanding principal amounts of the underlying insured obligations for financial guaranty contracts, gross of ceded contracts. + References No definition available. + Details
Name: | mbi_InsuredFinancialObligationsOutstandingPrincipalAmountGross
Namespace Prefix: | mbi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | srt_StatementGeographicalAxis=country_US
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementGeographicalAxis=mbi_NonUnitedStatesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_UnderlyingAssetClassAxis=mbi_TransportationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_UnderlyingAssetClassAxis=mbi_OtherPublicFinanceMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_UnderlyingAssetClassAxis=mbi_SovereignRelatedAndSubSovereignMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_GuaranteeObligationsByNatureAxis=mbi_GlobalPublicFinanceMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_UnderlyingAssetClassAxis=mbi_GeneralObligationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_UnderlyingAssetClassAxis=mbi_GeneralObligationLeaseMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_UnderlyingAssetClassAxis=mbi_MunicipalUtilitiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_UnderlyingAssetClassAxis=mbi_TaxBackedMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_UnderlyingAssetClassAxis=mbi_HigherEducationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_UnderlyingAssetClassAxis=us-gaap_HealthCareMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_UnderlyingAssetClassAxis=mbi_MilitaryHousingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_UnderlyingAssetClassAxis=mbi_InvestorOwnedUtilitiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_GuaranteeObligationsByNatureAxis=mbi_GlobalStructuredFinanceMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_UnderlyingAssetClassAxis=us-gaap_CollateralizedDebtObligationsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_UnderlyingAssetClassAxis=us-gaap_ResidentialMortgageBackedSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_UnderlyingAssetClassAxis=us-gaap_CommercialMortgageBackedSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_UnderlyingAssetClassAxis=mbi_ConsumerAssetBackedMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_UnderlyingAssetClassAxis=mbi_CorporateAssetBackedMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |