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Investments - Schedule of Carrying Value for Limited Partnership Interests (Details) - USD ($) $ in Millions | Sep. 30, 2024 | Dec. 31, 2023
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Debt and Equity Securities, FV-NI [Line Items] |  |
Limited partnership interests | $ 8,925 | $ 8,380
Private equity |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Limited partnership interests | 7,531 | 7,154
Real estate |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Limited partnership interests | 1,246 | 1,085
Other |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Limited partnership interests | $ 148 | $ 141

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