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25. NET REVENUE FROM SALES (Details) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
NetRevenueFromSalesLineItems [Line Items]      
Gross revenue R$ 34,049,060 R$ 28,883,717 R$ 26,570,460
Deductions      
Canceled sales, discounts and rebates (248,821) (325,794) (234,851)
Taxes on sales (3,736,219) (3,121,506) (3,366,724)
Deductions (3,985,040) (3,447,300) (3,601,575)
Net revenues 30,064,020 25,436,417 22,968,885
Domestic market [member]      
NetRevenueFromSalesLineItems [Line Items]      
Gross revenue 16,652,801 14,220,420 14,752,901
Foreign market [member]      
NetRevenueFromSalesLineItems [Line Items]      
Gross revenue R$ 17,396,259 R$ 14,663,297 R$ 11,817,559