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5. TRADE RECEIVABLES (Details 1) - BRL (R$)
R$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
TradeAndOtherReceivablesLineItems [Line Items]    
Trade receivable, after allowance for doubtful debts R$ 1,877,343 R$ 1,984,865
Third Parties [Member]    
TradeAndOtherReceivablesLineItems [Line Items]    
Trade receivable, after allowance for doubtful debts 2,122,537 2,222,217
Third Parties [Member] | Current [Member]    
TradeAndOtherReceivablesLineItems [Line Items]    
Trade receivable, after allowance for doubtful debts 1,739,746 1,514,847
Third Parties [Member] | Past-Due Up To 30 Days [Member]    
TradeAndOtherReceivablesLineItems [Line Items]    
Trade receivable, after allowance for doubtful debts 132,845 177,287
Third Parties [Member] | Past-Due Up To 180 Days [Member]    
TradeAndOtherReceivablesLineItems [Line Items]    
Trade receivable, after allowance for doubtful debts 23,877 47,684
Third Parties [Member] | Past-Due Over 180 Days [Member]    
TradeAndOtherReceivablesLineItems [Line Items]    
Trade receivable, after allowance for doubtful debts R$ 226,069 R$ 482,399