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6. TRADE ACCOUNTS RECEIVABLE AND OTHER RECEIVABLES (Details 2) - BRL (R$)
R$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
TradeAccountsReceivableAndOtherReceivablesLineItems [Line Items]    
Adjustment to present value R$ (13,316) R$ (10,121)
Expected credit losses (605,940) (503,848)
Total trade receivables 4,099,881 3,037,843
Current [member]    
TradeAccountsReceivableAndOtherReceivablesLineItems [Line Items]    
Trade receivables, gross 4,010,140 2,820,308
01 To 60 Days [Member]    
TradeAccountsReceivableAndOtherReceivablesLineItems [Line Items]    
Trade receivables, gross 104,195 143,303
61 To 90 Days [Member]    
TradeAccountsReceivableAndOtherReceivablesLineItems [Line Items]    
Trade receivables, gross 6,045 19,409
91 To 120 Days [Member]    
TradeAccountsReceivableAndOtherReceivablesLineItems [Line Items]    
Trade receivables, gross 398 3,723
121 To 180 Days [Member]    
TradeAccountsReceivableAndOtherReceivablesLineItems [Line Items]    
Trade receivables, gross 7,024 3,934
181 To 360 Days [Member]    
TradeAccountsReceivableAndOtherReceivablesLineItems [Line Items]    
Trade receivables, gross 15,688 20,748
More Than 361 Days [Member]    
TradeAccountsReceivableAndOtherReceivablesLineItems [Line Items]    
Trade receivables, gross R$ 575,647 R$ 540,387