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Investments - Limited Partnership (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2024
Net Investment Income [Line Items] |  |  |  |  |
Investment, Type [Extensible Enumeration] | Partnership Interest [Member] |  | Partnership Interest [Member] |  | Partnership Interest [Member]
Fair Value Measured at Net Asset Value Per Share |  |  |  |  |
Net Investment Income [Line Items] |  |  |  |  |
Alternative investments | $ 246 |  | $ 246 |  | $ 262
Unfunded additional commitments | 142 |  | 142 |  |
Net gains (losses) from limited partnership investments | $ 0 | $ 0 | $ 0 | $ 0 |

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