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Investments - Schedule of Portfolio Composition (Details) - USD ($) $ in Millions | Jun. 30, 2025 | Dec. 31, 2024
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Investments [Abstract] |  |
Fixed income securities, at fair value | $ 54,435 | $ 52,747
Equity securities, at fair value | 2,397 | 4,463
Mortgage loans, net | 807 | 784
Limited partnership interests | 9,194 | 9,255
Short-term investments, at fair value | 9,640 | 4,537
Other investments, net | 964 | 824
Total investments | $ 77,437 | $ 72,610

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