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5. TRADE RECEIVABLES (Details) - BRL (R$) R$ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
TradeAndOtherReceivablesLineItems [Line Items]
Allowance for doubtful debts	R$ 245,194	R$ 237,352	R$ (191,979)
Trade receivable, before allowance for doubtful debts	1,877,343	1,984,865
Trade receivables	2,047,931	2,078,182
Third Parties [Member]
TradeAndOtherReceivablesLineItems [Line Items]
Trade receivable, before allowance for doubtful debts	2,122,537	2,222,217
Third Parties [Member] | Domestic Market [Member]
TradeAndOtherReceivablesLineItems [Line Items]
Trade receivable, before allowance for doubtful debts	1,118,632	1,369,396
Third Parties [Member] | Foreign Market [member]
TradeAndOtherReceivablesLineItems [Line Items]
Trade receivable, before allowance for doubtful debts	1,003,905	852,821
Related Parties [Member]
TradeAndOtherReceivablesLineItems [Line Items]
Trade receivables	R$ 170,588	R$ 93,317

X

- 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 2019-01-01
-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 2019-03-27

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Balance Type:	credit
Period Type:	instant

X

- 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 2019-01-01
-Paragraph 78
-Subparagraph b
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_78_b&doctype=Standard
-URIDate 2019-03-27

+ Details

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X

- Definition

The amount of gross trade receivable.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- References

No definition available.

+ Details

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