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Taxes - Analysis of tax rate (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Reconciliation of accounting profit multiplied by applicable tax rates [abstract]      
Applicable tax rate $ (256) $ (168) $ (104)
Effect of disallowed expenditures (4) (7) (13)
Effect of deemed legal entity liquidation 57 0 0
Effect of equity-based compensation (2) (3) (13)
Effect of tax credits and allowances 18 12 11
Effect of deductibility of a statutory expense in Switzerland 0 568 23
Effect of adjustments to contingent consideration and other liabilities 0 2 3
Effect of changes in uncertain tax positions (43) (271) 10
Effect of previously unrecognized tax loss carryforward 12 11 0
Effect of 2022 APA on prior years 0 6 (37)
Effect of non-deductible amortization (9) (8) (7)
Effect of other items (10) (6) 2
Effect of prior year items (1) 6 (3)
Total income tax (expense)/income $ (238) $ 142 $ (128)
Reconciliation of average effective tax rate and applicable tax rate [abstract]      
Applicable tax rate 20.40% 20.20% 22.50%
Effect of disallowed expenditures 0.30% 0.80% 2.80%
Effect of deemed legal entity liquidation (4.50%) 0.00% 0.00%
Effect of equity-based compensation 0.20% 0.40% 2.80%
Effect of tax credits and allowances (1.40%) (1.40%) (2.40%)
Effect of deductibility of a statutory expense in Switzerland 0.00% (68.30%) (5.00%)
Effect of adjustments to contingent consideration and other liabilities 0.00% (0.20%) (0.60%)
Effect of changes in uncertain tax positions 3.40% 32.60% (2.20%)
Effect of previously unrecognized tax loss carryforward (1.00%) (1.30%) 0.00%
Effect of 2022 APA on prior years 0.00% (0.70%) 8.00%
Effect of non-deductible amortization 0.70% 1.00% 1.50%
Effect of other items 0.80% 0.70% (0.40%)
Effect of prior year items 0.10% (0.70%) 0.60%
Effective tax rate 18.90% (17.10%) 27.60%