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TRADE ACCOUNTS RECEIVABLE - Breakdown of balances (Details) - Trade accounts receivable - BRL (R$) R$ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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TRADE ACCOUNTS RECEIVABLE |  |
Financial assets | R$ 2,915,206 | R$ 3,035,817
Factoring of receivables |  |
TRADE ACCOUNTS RECEIVABLE |  |
Financial assets | 5,388,370 | 3,544,625
Gross | Domestic (Brazil) | Third parties |  |
TRADE ACCOUNTS RECEIVABLE |  |
Financial assets | 970,796 | 1,027,035
Gross | Domestic (Brazil) | Related parties |  |
TRADE ACCOUNTS RECEIVABLE |  |
Financial assets | 47,685 | 23,760
Gross | Foreign | Third parties |  |
TRADE ACCOUNTS RECEIVABLE |  |
Financial assets | 1,938,614 | 2,027,018
Expected credit losses |  |
TRADE ACCOUNTS RECEIVABLE |  |
Financial assets | R$ (41,889) | R$ (41,996)

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