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Income Taxes - Income before taxes by jurisdiction (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Income Tax Disclosure [Line Items] |  |  |
Income (loss) before income taxes | $ 4,674 | $ 3,570 | $ 1,562
Bermuda |  |  |
Income Tax Disclosure [Line Items] |  |  |
Income (loss) before income taxes | 2,611 | 2,099 | 986
United States |  |  |
Income Tax Disclosure [Line Items] |  |  |
Income (loss) before income taxes | 1,438 | 1,239 | 401
Other |  |  |
Income Tax Disclosure [Line Items] |  |  |
Income (loss) before income taxes | $ 625 | $ 232 | $ 175

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