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6. TRADE RECEIVABLES (Details) - BRL (R$) R$ in Thousands | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | ---
TradeAndOtherReceivablesLineItems [Line Items] |  |  |
Allowance for doubtful debts | R$ (228,348) | R$ (245,194) | R$ (237,352)
Trade receivable, after allowance for doubtful debts | 2,746,176 | 1,877,343 |
Trade receivables | 2,867,352 | 2,047,931 |
Third parties [member] |  |  |
TradeAndOtherReceivablesLineItems [Line Items] |  |  |
Trade receivable, before allowance for doubtful debts | 2,974,524 | 2,122,537 |
Third parties [member] | Domestic Market [member] |  |  |
TradeAndOtherReceivablesLineItems [Line Items] |  |  |
Trade receivable, before allowance for doubtful debts | 910,657 | 1,118,632 |
Third parties [member] | Foreign Market [member] |  |  |
TradeAndOtherReceivablesLineItems [Line Items] |  |  |
Trade receivable, before allowance for doubtful debts | 2,063,867 | 1,003,905 |
Related Parties [member] |  |  |
TradeAndOtherReceivablesLineItems [Line Items] |  |  |
Trade receivables | R$ 121,176 | R$ 170,588 |

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- Definition The amount of an allowance account used to record impairments to financial assets due to credit losses. [Refer: Financial assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2021-01-01 -Name IFRS -Number 7 -IssueDate 2020-01-01 -Paragraph 16 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2017-en-b&anchor=para_16&doctype=Standard&book=b -URIDate 2020-01-01 + Details
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- Definition The amount due from customers for goods and services sold. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 78 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_78_b&doctype=Standard -URIDate 2020-01-01 + Details
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