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Employee benefits - Average Life Expectancy After Retirement (Details) - Defined benefit retirement plans - yr
Dec. 31, 2021
Dec. 31, 2020
Germany    
Disclosure of defined benefit plans [line items]    
Male 21 21
Female 24 24
SWEDEN    
Disclosure of defined benefit plans [line items]    
Male 22 22
Female 24 24
Austria    
Disclosure of defined benefit plans [line items]    
Male 23 23
Female 26 26
Italy    
Disclosure of defined benefit plans [line items]    
Male 21 21
Female 22 22
SWITZERLAND    
Disclosure of defined benefit plans [line items]    
Male 22 21
Female 24 24