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Investments - Schedule of Net Appreciation (Decline) Recognized in Net Income (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2024 | Mar. 31, 2023
Debt and Equity Securities, FV-NI [Line Items] |  |
Total | $ 91 | $ 36
Equity securities |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Total | 61 | 20
Limited partnership interests carried at fair value |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Total | $ 30 | $ 16

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