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Income Taxes - Components of income tax (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Current expense (benefit):      
Federal - Bermuda $ 211 $ 1 $ 7
Current tax expense (benefit) 586 397 288
Deferred expense (benefit):      
Federal - Bermuda 100 12 (1,179)
Deferred tax expense (benefit) 174 (35) (1,161)
Income tax expense (benefit) 760 362 (873)
United States      
Current expense (benefit):      
Foreign 270 332 251
Deferred expense (benefit):      
Foreign 60 (21) (20)
Other      
Current expense (benefit):      
Foreign 105 64 30
Deferred expense (benefit):      
Foreign $ 14 $ (26) $ 38