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Schedule of actuarial assumptions used for calculating postemployment healthcare benefits (Details) - Number
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
IfrsStatementLineItems [Line Items]    
General mortality table Millennium Plan: AT-2012 segregated by gender Plan 35%: AT-2000 Male aggravated by 15% Supplementation: AT-2000 aggravated by 10% segregated by gender Millennium Plan: AT-2012 segregated by gender Plan 35%: AT-2000 Male aggravated by 15% Supplementation: AT-2000 aggravated by 10% segregated by gender
Actuarial assumption of expected rates of inflation 5.03% 3.32%
Post Employment Healthcare Benefits [Member]    
IfrsStatementLineItems [Line Items]    
General mortality table AT 2000 segregated by gender 20% AT 2000 segregated by gender 20%
Actuarial assumption of discount rates 10.55% 6.53%
Actuarial assumption of expected rates of inflation 5.03% 3.32%
Real increase in medical costs based on age (Aging Factor) 0.5% - 3.00% real p.a. 0.5% - 3.00% real p.a.
Actuarial assumption of medical cost trend rates 4.10% 4.10%
Average medical cost 1,011.42 913.00