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Schedule of breakdown of capital stock by nature (Details) - shares
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
IfrsStatementLineItems [Line Items]      
Outstanding shares 807,419,692 807,707,162 811,759,800
Issued capital [member]      
IfrsStatementLineItems [Line Items]      
Outstanding shares 812,473,246 812,473,246 812,473,246
Treasury shares [member]      
IfrsStatementLineItems [Line Items]      
Outstanding shares (5,053,554) (4,766,084) (713,446)