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Schedule of breakdown of capital stock by nature (Details) - shares
Sep. 30, 2021
Dec. 31, 2020
EquityLineitems [Line Items]    
Outstanding shares 808,411,566 807,707,162
Issued capital [member]    
EquityLineitems [Line Items]    
Outstanding shares 812,473,246 812,473,246
Treasury shares [member]    
EquityLineitems [Line Items]    
Outstanding shares (4,061,680) (4,766,084)