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Schedule of life expectancy (Details)
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Unified Plan [Member]    
IfrsStatementLineItems [Line Items]    
Retired participants life expectancy 11 years 7 months 6 days 12 years 4 months 17 days
Pensioner participants life expectancy 13 years 2 months 19 days 14 years 26 days
Plan I I I [Member]    
IfrsStatementLineItems [Line Items]    
Retired participants life expectancy 23 years 5 months 20 days 23 years 1 month 27 days
Pensioner participants life expectancy 27 years 7 days 24 years 11 months 23 days