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Post-employment benefits for associates - Weighted average actuarial assumptions (Details)
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Pension plans    
Disclosure of defined benefit plans [line items]    
Discount rate 3.20% 3.00%
Expected rate of pension increase 1.00% 1.10%
Expected rate of salary increase 2.60% 2.70%
Interest on savings account 2.00% 2.20%
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 1.60% 1.90%
Pension plans | United States | Foreign countries    
Disclosure of defined benefit plans [line items]    
Discount rate 5.40% 5.00%
Pension plans | Germany | Foreign countries    
Disclosure of defined benefit plans [line items]    
Discount rate 3.50% 3.10%
Pension plans | United Kingdom | Foreign countries    
Disclosure of defined benefit plans [line items]    
Discount rate 5.50% 4.50%
Other post-employment benefit plans    
Disclosure of defined benefit plans [line items]    
Discount rate 5.50% 5.00%
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 5.50% 5.00%