21 NET SALES REVENUE (Details) - BRL (R$) R$ in Thousands	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
NetSalesRevenueLineItems [Line Items]
Gross revenue	R$ 28,883,717	R$ 26,570,460	R$ 21,467,583
Deductions
Canceled sales, discounts and rebates	(325,794)	(234,851)	(262,989)
Taxes on sales	(3,121,506)	(3,366,724)	(2,679,993)
Deductions	(3,447,300)	(3,601,575)	(2,942,982)
Net revenues	25,436,417	22,968,885	18,524,601
Domestic Market [Member]
NetSalesRevenueLineItems [Line Items]
Gross revenue	14,220,420	14,752,901	11,487,011
Deductions
Net revenues	10,950,701	11,353,437	8,706,466
Foreign Market [Member]
NetSalesRevenueLineItems [Line Items]
Gross revenue	14,663,297	11,817,559	9,980,572
Deductions
Net revenues	R$ 14,485,716	R$ 11,615,448	R$ 9,818,135

Expiry date 2020-01-01: The income arising in the course of an entity's ordinary activities. Income is increases in economic benefits during the accounting period in the form of inflows or enhancements of assets or decreases of liabilities that result in an increase in equity, other than those relating to contributions from equity participants. Effective 2020-01-01: The income arising in the course of an entity's ordinary activities. Income is increases in assets, or decreases in liabilities, that result in increases in equity, other than those relating to contributions from holders of equity claims.

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+ Details