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Post-employment benefits for associates (Details 5)
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Pension plans      
Disclosure of defined benefit plans [line items]      
Discount rate 0.60% 1.00% 1.60%
Expected rate of pension increase 0.30% 0.30% 0.40%
Expected rate of salary increase 2.70% 2.80% 2.80%
Interest on savings account 0.10% 0.30% 0.80%
Current life expectancy for a 65-year-old male 22 years 22 years 22 years
Current life expectancy for a 65-year-old female 24 years 24 years 24 years
Other post-employment benefit plans      
Disclosure of defined benefit plans [line items]      
Discount rate 2.90% 3.60% 4.40%
Current life expectancy for a 65-year-old male 21 years 21 years 21 years
Current life expectancy for a 65-year-old female 23 years 23 years 23 years