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Taxes - Analysis of tax rate (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2022
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Reconciliation of accounting profit multiplied by applicable tax rates [abstract]        
Applicable tax rate   $ (168) $ (104) $ (39)
Effect of disallowed expenditures   (7) (13) (10)
Effect of equity-based compensation   (3) (13) (7)
Effect of tax credits and allowances   12 11 9
Effect of deductibility of a statutory expense in Switzerland   568 23 38
Effect of adjustments to contingent consideration and other liabilities   2 3 7
Effect of changes in uncertain tax positions   (271) 10 (39)
Effect of previously unrecognized tax loss carryforward   11 0 0
Effect of 2022 APA on prior years $ (37) 6 (37) 0
Effect of non-deductible amortization   (8) (7) 0
Effect of other items   (6) 2 (7)
Effect of prior year items   6 (3) 6
Total income tax income/(expense)   $ 142 $ (128) $ (42)
Reconciliation of average effective tax rate and applicable tax rate [abstract]        
Applicable tax rate   20.20% 22.50% 9.30%
Effect of disallowed expenditures   0.80% 2.80% 2.40%
Effect of equity-based compensation   0.40% 2.80% 1.70%
Effect of tax credits and allowances   (1.40%) (2.40%) (2.20%)
Effect of deductibility of a statutory expense in Switzerland(2)   (68.30%) (5.00%) (9.10%)
Effect of adjustments to contingent consideration and other liabilities   (0.20%) (0.60%) (1.70%)
Effect of changes in uncertain tax positions   32.60% (2.20%) 9.30%
Effect of previously unrecognized tax loss carryforward   (1.30%) 0.00% 0.00%
Effect of 2022 APA on prior years   (0.70%) 8.00% 0.00%
Effect of non-deductible amortization   1.00% 1.50% 0.00%
Effect of other items   0.70% (0.40%) 1.70%
Effect of prior year items   (0.70%) 0.60% (1.40%)
Effective tax rate   (17.10%) 27.60% 10.00%
Not subject to expiry $ 776 $ 681 $ 776