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Post-employment benefits for associates - Weighted average actuarial assumptions (Details)
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Pension plans    
Disclosure of defined benefit plans [line items]    
Discount rate (as a percent) 3.00% 3.60%
Expected rate of pension increase (as a percent) 1.10% 1.10%
Expected rate of salary increase (as a percent) 2.70% 2.50%
Interest on savings account (as a percent) 2.20% 2.90%
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 (as a percent) 1.90% 2.20%
Pension plans | United States | Foreign countries    
Disclosure of defined benefit plans [line items]    
Discount rate (as a percent) 5.00% 5.30%
Pension plans | Germany | Foreign countries    
Disclosure of defined benefit plans [line items]    
Discount rate (as a percent) 3.10% 3.70%
Pension plans | United Kingdom | Foreign countries    
Disclosure of defined benefit plans [line items]    
Discount rate (as a percent) 4.50% 4.80%
Other post-employment benefit plans    
Disclosure of defined benefit plans [line items]    
Discount rate (as a percent) 5.00% 5.30%
Expected rate of pension increase (as a percent)
Expected rate of salary increase (as a percent)
Interest on savings account (as a percent)
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 (as a percent) 5.00% 5.30%