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Schedule of trade receivables (Details) - BRL (R$)
R$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
IfrsStatementLineItems [Line Items]      
Allowance for doubtful debts R$ (236,927) R$ (228,348) R$ (245,194)
Trade receivable, after allowance for doubtful debts 2,453,442 2,746,176  
Trade receivables 2,597,838 2,867,352  
Third Parties [Member]      
IfrsStatementLineItems [Line Items]      
Trade receivable, before allowance for doubtful debts 2,690,369 2,974,524  
Third Parties [Member] | Country of domicile [member]      
IfrsStatementLineItems [Line Items]      
Trade receivable, before allowance for doubtful debts 1,218,179 910,657  
Third Parties [Member] | Foreign countries [member]      
IfrsStatementLineItems [Line Items]      
Trade receivable, before allowance for doubtful debts 1,472,190 2,063,867  
Related Partie [Member]      
IfrsStatementLineItems [Line Items]      
Trade receivables R$ 144,396 R$ 121,176