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Investments - Balances of Restricted Investments (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
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Schedule of Held-to-maturity Securities [Line Items] |  |
Restricted investments | $ 261 | $ 238
Cash and cash equivalents |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Restricted investments | 60 | 42
U.S. Treasury notes |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Restricted investments | 167 | 159
Corporate debt securities |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Restricted investments | $ 34 | $ 37

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