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Income Taxes - Income before taxes by jurisdiction (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Income Tax Disclosure [Line Items]
Income (loss) before income taxes, Bermuda	$ 3,121	$ 2,611	$ 2,099
Income (loss) before income taxes	5,159	4,674	3,570
United States
Income Tax Disclosure [Line Items]
Income (loss) before income taxes, foreign	1,660	1,438	1,239
Other
Income Tax Disclosure [Line Items]
Income (loss) before income taxes, foreign	$ 378	$ 625	$ 232

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Amount of income (loss) from continuing operations, including income (loss) from equity method investments, before deduction of income tax expense (benefit), and income (loss) attributable to noncontrolling interest.

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