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Taxes - Analysis of tax rate (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Reconciliation of accounting profit multiplied by applicable tax rates [abstract]      
Applicable tax rate $ (104) $ (39) $ 98
Effect of disallowed expenditures (13) (10) (20)
Effect of equity-based compensation (13) (7) (5)
Effect of income taxed at reduced rates 4 1 4
Effect of tax credits and allowances 11 9 9
Effect of deductibility of a statutory expense in Switzerland 23 38 0
Effect of adjustments to contingent consideration and other liabilities 3 7 17
Effect of option payments 0 (2) (6)
Tax effect from change in tax rate 0 (3) 10
Effect of changes in uncertain tax positions 10 (39) (8)
Effect of 2022 APA on prior years (37) 0 0
Tax Effect Of Nondeductible Amortization Expense, Amount (7) 0 0
Effect of other items (2) (3) (10)
Effect of prior year items (3) 6 15
Total income tax (expense)/income $ (128) $ (42) $ 104
Reconciliation of average effective tax rate and applicable tax rate [abstract]      
Applicable tax rate 22.50% 9.30% 15.40%
Effect of disallowed expenditures 2.80% 2.40% (3.10%)
Effect of equity-based compensation 2.80% 1.70% (0.80%)
Effect of income taxed at reduced rates (0.90%) (0.20%) 0.60%
Effect of tax credits and allowances (2.40%) (2.20%) 1.40%
Effect of deductibility of a statutory expense in Switzerland (5.00%) (9.10%) 0.00%
Effect of adjustments to contingent consideration and other liabilities (0.60%) (1.70%) 2.70%
Effect of option payments 0.00% 0.50% (0.90%)
Effect of tax rate changes 0.00% 0.70% 1.60%
Effect of changes in uncertain tax positions (2.20%) 9.30% (1.30%)
Effect of 2022 APA on prior years 8.00% 0.00% 0.00%
Effect of non-deductible amortization 1.50% 0.00% 0.00%
Effect of other items 0.40% 0.70% (1.60%)
Effect of prior year items 0.60% (1.40%) 2.40%
Effective tax rate 27.60% 10.00% 16.40%
Effect of current year taxes $ 64