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Investments - Summary of Amortized Cost and Fair Values of Fixed Maturity Securities (Details) - USD ($) | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Cost | $ 32,000,000 | $ 33,000,000
Cost, Less than 12 Months | 10,000,000 | 11,000,000
Cost, 12 Months or More | 22,000,000 | 22,000,000
Unrealized losses, 12 Months or More | (1,000,000) | (1,000,000)
Fair value | 31,000,000 | 32,000,000
U.S. Treasury securities, obligations of U.S. Government agencies and municipalities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cost | 24,000,000 | 25,000,000
Cost, Less than 12 Months | 6,000,000 | 7,000,000
Cost, 12 Months or More | 18,000,000 | 18,000,000
Unrealized losses, 12 Months or More | (1,000,000) | (1,000,000)
Fair value | 23,000,000 | 24,000,000
Corporate debt |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cost | 5,000,000 | 5,000,000
Cost, Less than 12 Months | 4,000,000 | 4,000,000
Cost, 12 Months or More | 1,000,000 | 1,000,000
Fair value | 5,000,000 | 5,000,000
Non-subsidiary equity |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cost | 3,000,000 | 3,000,000
Cost, 12 Months or More | 3,000,000 | 3,000,000
Fair value | $ 3,000,000 | $ 3,000,000

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