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Investments - Schedule of Carrying Value for Limited Partnership Interests (Details) - USD ($) $ in Millions | Mar. 31, 2025 | Dec. 31, 2024
--- | --- | ---
Debt and Equity Securities, FV-NI [Line Items] |  |
Limited partnership interests | $ 9,380 | $ 9,255
Private equity |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Limited partnership interests | 7,744 | 7,734
Real estate |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Limited partnership interests | 1,355 | 1,236
Other |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Limited partnership interests | $ 281 | $ 285

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