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Investments (Tables) | 3 Months Ended
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Mar. 31, 2024
Investments, Debt and Equity Securities [Abstract] |
Summary of Amortized Cost and Fair Values of Fixed Maturity Securities | At March 31, 2024, the Company’s amortized cost and fair values of fixed maturity securities are summarized as follows:
|  | Less than 12 Months |  |  | 12 Months or More |  |  | Total |
(in millions) |  | Cost |  |  | Unrealized Gains |  |  | Unrealized losses |  |  | Cost |  |  | Unrealized Gains |  |  | Unrealized losses |  |  | Cost |  |  | Fair Value |
U.S. Treasury securities, obligations of U.S. Government agencies and municipalities |  | $ | 6 |  |  | $ | — |  |  | $ | — |  |  | $ | 18 |  |  | $ | — |  |  | $ | (1 | ) |  | $ | 24 |  |  | $ | 23 |
Corporate debt |  |  | 4 |  |  |  | — |  |  |  | — |  |  |  | 1 |  |  |  | — |  |  |  | — |  |  |  | 5 |  |  |  | 5 |
Non-subsidiary equity |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 3 |  |  | $ | — |  |  | $ | — |  |  | $ | 3 |  |  | $ | 3 |
Total |  | $ | 10 |  |  | $ | — |  |  | $ | — |  |  | $ | 22 |  |  | $ | — |  |  | $ | (1 | ) |  | $ | 32 |  |  | $ | 31 |
At December 31, 2023, the Company’s amortized cost and fair values of fixed maturity securities are summarized as follows:
|  | Less than 12 Months |  |  | 12 Months or More |  |  | Total |
(in millions) |  | Cost |  |  | Unrealized Gains |  |  | Unrealized losses |  |  | Cost |  |  | Unrealized Gains |  |  | Unrealized losses |  |  | Cost |  |  | Fair Value |
U.S. Treasury securities, obligations of U.S. Government agencies and municipalities |  | $ | 7 |  |  | $ | — |  |  | $ | — |  |  | $ | 18 |  |  | $ | — |  |  | $ | (1 | ) |  | $ | 25 |  |  | $ | 24 |
Corporate debt |  |  | 4 |  |  |  | — |  |  |  | — |  |  |  | 1 |  |  |  | — |  |  |  | — |  |  |  | 5 |  |  |  | 5 |
Non-subsidiary equity |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 3 |  |  | $ | — |  |  | $ | — |  |  | $ | 3 |  |  | $ | 3 |
Total |  | $ | 11 |  |  | $ | — |  |  | $ | — |  |  | $ | 22 |  |  | $ | — |  |  | $ | (1 | ) |  | $ | 33 |  |  | $ | 32 |

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- Definition Tabular disclosure of the reconciliation of available-for-sale securities from cost basis to fair value. + References No definition available. + Details
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