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Taxes - Current and deferred income taxes (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Current income tax (expense) $ (334) $ (167) $ (163)
Deferred tax income 96 309 35
Total income tax (expense)/income (238) 142 (128)
Switzerland      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Current income tax (expense) (95) (74) (17)
Deferred tax income 25 313 53
Foreign      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Current income tax (expense) (239) (93) (146)
Deferred tax income $ 71 $ (4) $ (18)