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Post-employment Benefits - Actuarial assumptions (Details)
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Post-employment Benefits    
Actuarial assumption of retirement age 65 years  
Discount rate (as a percent) 7.80% 6.60%
Salary increase (as a percent) 5.00% 5.00%
Inflation rate (as a percent) 3.50% 3.50%