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Schedule I - Investments | 12 Months Ended
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Dec. 31, 2023
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, 2023 (In millions)
|  |  |  |  |  | December 31, 2023 |
|  |  |  |  |  |  |  |  |  |  |  | Amount at |
|  |  |  |  |  |  |  |  |  |  |  | which shown |
|  |  |  |  |  |  |  |  |  |  |  | in the |
Type of investment |  | Cost |  |  | Fair Value |  |  | balance sheet |
Available-for-sale: |  |  |  |  |  |  |  |  |
| U.S. Treasury and government agency |  | $ | 214 |  |  | $ | 198 |  |  | $ | 198 |
| State and municipal bonds |  |  | 128 |  |  |  | 123 |  |  |  | 123 |
| Foreign governments |  |  | 13 |  |  |  | 11 |  |  |  | 11 |
| Corporate obligations |  |  | 504 |  |  |  | 417 |  |  |  | 417 |
| Mortgage-backed securities: |  |  |  |  |  |  |  |  |
|  | Residential mortgage-backed agency |  |  | 149 |  |  |  | 135 |  |  |  | 135 |
|  | Residential mortgage-backed non-agency |  |  | 31 |  |  |  | 26 |  |  |  | 26 |
|  | Commercial mortgage-backed |  |  | 14 |  |  |  | 13 |  |  |  | 13 |
| Asset-backed securities: |  |  |  |  |  |  |  |  |
|  | Collateralized debt obligations |  |  | 96 |  |  |  | 95 |  |  |  | 95 |
|  | Other asset-backed |  |  | 26 |  |  |  | 25 |  |  |  | 25 |
|  |  | Total long-term available-for-sale |  |  | 1,175 |  |  |  | 1,043 |  |  |  | 1,043 |
| Short-term available-for-sale |  |  | 513 |  |  |  | 514 |  |  |  | 514 |
|  |  | Total available-for-sale |  |  | 1,688 |  |  |  | 1,557 |  |  |  | 1,557 |
Investments at fair value |  |  | 373 |  |  |  | 371 |  |  |  | 371 |
Other investments |  | 3 |  |  |  | 3 |  |  |  | 3 |
|  |  | Total investments |  | $ | 2,064 |  |  | $ | 1,931 |  |  | $ | 1,931 |
Assets of consolidated variable interest entities: |  |  |  |  |  |  |  |
| Investments at fair value |  | $ | 20 |  |  | $ | 22 |  |  | $ | 22 |
| Loans receivable |  |  | 47 |  |  |  | 35 |  |  |  | 35 |
|  |  |  | Total investments of consolidated variable interest entities | $ | 67 |  |  | $ | 57 |  |  | $ | 57 |

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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//1943274/2147480032/946-320-S99-7 + Details
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