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Income taxes (Details 2) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Statement [line items]      
Applicable tax rate 16.80% 14.80% 13.60%
Effect of disallowed expenditures 2.60% 1.00% 4.60%
Effect of utilization of tax losses brought forward from prior periods 0.00% 0.00% (0.30%)
Effect of income taxed at reduced rates (0.30%) (0.10%) (0.30%)
Tax rate effect of revenues exempt from taxation (0.10%) (7.50%) (0.70%)
Effect of tax credits and allowances (3.80%) (1.40%) (2.30%)
Effect of release of contingent consideration liability (0.50%) (0.10%) (0.20%)
Effect of tax rate change on current and deferred tax assets and liabilities (0.10%) 0.00% 0.30%
Effect of derecognition and reversals of derecognition of deferred tax assets 1.20% 0.00% 0.20%
Effect of write down and reversal of write down of investments in subsidiaries 0.00% 0.00% (0.80%)
Effect of prior year items (0.40%) 0.10% 2.30%
Effective income tax rate reconciliation change in uncertain tax positions 1.40% 1.30% 2.00%
Effect of other items 0.10% 0.00% (0.10%)
Effective tax rate 16.90% 8.10% 18.30%
Effect of income not subject to tax on divestment gain   (7.30%)  
Tax benefit arising from previously unrecognised tax loss, tax credit or temporary difference of prior period used to reduce current tax expense $ 1 $ 5 $ 29