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Schedule of aging of trade accounts receivable (Details) - BRL (R$)
R$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
IfrsStatementLineItems [Line Items]    
Adjustment to present value R$ (14,394) R$ (13,316)
Expected credit losses (638,583) (605,940)
Total trade receivables 4,044,965 4,099,881
Current [member]    
IfrsStatementLineItems [Line Items]    
Trade receivables, gross 3,933,343 4,010,140
Later than one month and not later than two months [member]    
IfrsStatementLineItems [Line Items]    
Trade receivables, gross 127,249 104,195
Later than two months and not later than three months [member]    
IfrsStatementLineItems [Line Items]    
Trade receivables, gross 6,241 6,045
Later than three months and not later than four months [member]    
IfrsStatementLineItems [Line Items]    
Trade receivables, gross 3,770 398
Later Than Four Months And Not Later Than S Ix Months [Member]    
IfrsStatementLineItems [Line Items]    
Trade receivables, gross 3,002 7,024
Later Than Six Months And Not Later Three Sixty Days [Member]    
IfrsStatementLineItems [Line Items]    
Trade receivables, gross 9,687 15,688
Later Than Three Sixty One [Member]    
IfrsStatementLineItems [Line Items]    
Trade receivables, gross R$ 614,650 R$ 575,647