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Income Taxes - Income before taxes by jurisdiction (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Income Tax Disclosure [Line Items]      
Income (loss) before income taxes $ 3,570 $ 1,562 $ 2,368
Bermuda      
Income Tax Disclosure [Line Items]      
Income (loss) before income taxes 2,099 986 1,519
United States      
Income Tax Disclosure [Line Items]      
Income (loss) before income taxes 1,239 401 643
Other      
Income Tax Disclosure [Line Items]      
Income (loss) before income taxes $ 232 $ 175 $ 206