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Investments - Additional Information (Details) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2024 USD ($) Security | Dec. 31, 2023 Security
Debt Securities, Available-for-sale [Line Items] |  |
Number of securities in unrealized loss position | Security | 31 | 28
Proceeds from sale of investment in fixed maturity securities | $ 1 |
Maximum investment maturity period | 5 years | 5 years
Investments on deposit with the state insurance department | $ 4 |

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