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Employee benefits - Actuarial Assumptions (Details)
Dec. 31, 2021
Dec. 31, 2020
Bottom of range | Germany | Defined benefit retirement plans    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Rate of increase for pensions in payment 1.00% 1.00%
Bottom of range | SWITZERLAND | Defined benefit retirement plans    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Rate of increase in salaries   0.00%
Top of range | Germany | Defined benefit retirement plans    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Rate of increase for pensions in payment 2.00% 2.00%
Top of range | SWITZERLAND | Defined benefit retirement plans    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Rate of increase in salaries   2.50%
Germany | Defined benefit retirement plans    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Discount rate 1.10% 0.55%
Inflation rate 2.00% 2.00%
Rate of increase in salaries 2.80% 2.80%
SWEDEN | Defined benefit retirement plans    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Discount rate 1.80% 1.05%
Inflation rate 2.20% 1.50%
Rate of increase in salaries 3.20% 2.50%
Rate of increase for pensions in payment 2.20% 1.50%
Austria | Defined benefit retirement plans    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Discount rate 0.90% 1.00%
Inflation rate 2.00% 2.00%
Rate of increase in salaries 2.00% 2.00%
Rate of increase for pensions in payment 0.00% 0.00%
Italy    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Discount rate 0.35% 0.33%
Inflation rate 1.50% 1.00%
Rate of increase in salaries 2.63% 2.63%
Rate of increase for pensions in payment 0.00% 0.00%
SWITZERLAND | Defined benefit retirement plans    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Discount rate 0.10% 0.15%
Inflation rate 1.00% 0.20%
Rate of increase in salaries 1.50%  
Rate of increase for pensions in payment 0.00% 0.00%