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Post-employment benefits for associates - Weighted average actuarial assumptions (Details)
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Pension plans    
Disclosure of defined benefit plans [line items]    
Discount rate 3.60% 1.40%
Expected rate of pension increase 1.10% 1.10%
Expected rate of salary increase 2.50% 2.20%
Interest on savings account 2.90% 1.30%
Current average life expectancy for a 65-year-old male (in years) 20 years 20 years
Current average life expectancy for a 65-year-old female (in years) 22 years 22 years
Pension plans | Switzerland | Country of domicile    
Disclosure of defined benefit plans [line items]    
Discount rate 2.20% 0.20%
Pension plans | United States | Foreign countries    
Disclosure of defined benefit plans [line items]    
Discount rate 5.30% 2.80%
Pension plans | Germany | Foreign countries    
Disclosure of defined benefit plans [line items]    
Discount rate 3.70% 1.20%
Pension plans | United Kingdom | Foreign countries    
Disclosure of defined benefit plans [line items]    
Discount rate 4.80% 1.90%
Other post-employment benefit plans    
Disclosure of defined benefit plans [line items]    
Discount rate 5.30% 2.70%
Expected rate of pension increase
Expected rate of salary increase
Interest on savings account
Current average life expectancy for a 65-year-old male (in years) 21 years 21 years
Current average life expectancy for a 65-year-old female (in years) 23 years 23 years
Other post-employment benefit plans | United States | Foreign countries    
Disclosure of defined benefit plans [line items]    
Discount rate 5.30% 2.70%