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Schedule I - Investments | 12 Months Ended
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Dec. 31, 2024
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Abstract] |
Schedule I - Summary Of Investments, Other Than Investments In Related Parties | SCHEDU LE I MBIA INC. AND SUBSIDIARIES SUMMARY OF INVESTMENTS, OTHER THAN INVESTMENTS IN RELATED PARTIES December 31, 2024 (In millions)
|  |  |  |  |  | December 31, 2024 |
|  |  |  |  |  |  |  |  |  |  |  | Amount at |
|  |  |  |  |  |  |  |  |  |  |  | which shown |
|  |  |  |  |  |  |  |  |  |  |  | in the |
Type of investment |  | Cost |  |  | Fair Value |  |  | balance sheet |
Available-for-sale: |  |  |  |  |  |  |  |  |
| U.S. Treasury and government agency |  | $ | 189 |  |  | $ | 170 |  |  | $ | 170 |
| State and municipal bonds |  |  | 110 |  |  |  | 101 |  |  |  | 101 |
| Foreign governments |  |  | 12 |  |  |  | 10 |  |  |  | 10 |
| Corporate obligations |  |  | 496 |  |  |  | 391 |  |  |  | 391 |
| Mortgage-backed securities: |  |  |  |  |  |  |  |  |
|  | Residential mortgage-backed agency |  |  | 127 |  |  |  | 111 |  |  |  | 111 |
|  | Residential mortgage-backed non-agency |  |  | 36 |  |  |  | 32 |  |  |  | 32 |
|  | Commercial mortgage-backed |  |  | 7 |  |  |  | 7 |  |  |  | 7 |
| Asset-backed securities: |  |  |  |  |  |  |  |  |
|  | Collateralized debt obligations |  |  | 71 |  |  |  | 72 |  |  |  | 72 |
|  | Other asset-backed |  |  | 32 |  |  |  | 31 |  |  |  | 31 |
|  |  | Total long-term available-for-sale |  |  | 1,080 |  |  |  | 925 |  |  |  | 925 |
| Short-term available-for-sale |  |  | 311 |  |  |  | 311 |  |  |  | 311 |
|  |  | Total available-for-sale |  |  | 1,391 |  |  |  | 1,236 |  |  |  | 1,236 |
Investments at fair value |  |  | 463 |  |  |  | 418 |  |  |  | 418 |
Other investments |  | 1 |  |  |  | 1 |  |  |  | 1 |
|  |  | Total investments |  | $ | 1,855 |  |  | $ | 1,655 |  |  | $ | 1,655 |
Assets of consolidated variable interest entities: |  |  |  |  |  |  |  |
| Loans receivable |  | $ | 37 |  |  | $ | 28 |  |  | $ | 28 |
|  |  |  | Total investments of consolidated variable interest entities | $ | 37 |  |  | $ | 28 |  |  | $ | 28 |

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- Definition The entire disclosure of information about investment held by insurance company, excluding investment in related party. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name Regulation S-X (SX) -Number 210 -Section 12 -Subsection 15 -Publisher SEC Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 320 -Name Accounting Standards Codification -Section S99 -Paragraph 7 -Subparagraph (SX 210.12-15) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477271/946-320-S99-7 + Details
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