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Investments - Schedule of Net Appreciation (Decline) Recognized in Net Income (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Debt and Equity Securities, FV-NI [Line Items] |  |  |  |
Total | $ 125 | $ (13) | $ 235 | $ 98
Equity securities |  |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |  |
Total | 107 | (32) | 170 | 31
Limited partnership interests carried at fair value |  |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |  |
Total | $ 18 | $ 19 | $ 65 | $ 67

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