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TRADE ACCOUNTS RECEIVABLE - Summary of balances (Details) - Trade accounts receivable - BRL (R$)
R$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
TRADE ACCOUNTS RECEIVABLE    
Financial assets R$ 3,762,875 R$ 3,035,817
Factoring of receivables    
TRADE ACCOUNTS RECEIVABLE    
Financial assets 4,968,024 3,544,625
Gross | Domestic | Third parties    
TRADE ACCOUNTS RECEIVABLE    
Financial assets 888,372 1,027,034
Gross | Domestic | Related parties    
TRADE ACCOUNTS RECEIVABLE    
Financial assets 35,394 23,761
Gross | Foreign | Third parties    
TRADE ACCOUNTS RECEIVABLE    
Financial assets 2,891,501 2,027,018
Expected credit losses    
TRADE ACCOUNTS RECEIVABLE    
Financial assets R$ 52,392 R$ 41,996