21. NET SALES AND SERVICES REVENUE (Details) - BRL (R$) R$ in Thousands	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Disclosure of disaggregation of revenue from contracts with customers [line items]
Gross revenue	R$ 21,467,583	R$ 19,777,825	R$ 17,938,566
Sales returns and discounts	(262,989)	(190,415)	(297,957)
Taxes on sales	(2,679,993)	(2,438,461)	(2,378,912)
Deductions	(2,942,982)	(2,628,876)	(2,676,869)
Net revenues	18,524,601	17,148,949	15,261,697
Domestic market
Disclosure of disaggregation of revenue from contracts with customers [line items]
Gross revenue	11,487,011	10,206,195	10,212,748
Net revenues	8,706,466	7,729,913	7,682,533
Foreign market
Disclosure of disaggregation of revenue from contracts with customers [line items]
Gross revenue	9,980,572	9,571,630	7,725,818
Net revenues	R$ 9,818,135	R$ 9,419,036	R$ 7,579,164

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.

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+ Details