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EXPENSES BY NATURE - Classified by nature (Details) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
EXPENSES BY NATURE      
Depreciation and amortisation R$ (2,074,295) R$ (1,891,814) R$ (2,092,551)
Labor expenses (5,175,373) (5,724,352) (5,514,721)
Raw material and consumption material (25,890,618) (29,623,418) (23,423,950)
Freight (2,300,439) (2,770,516) (2,281,773)
Impairment of non-financial assets     (1,114,807)
Gains and losses on assets held for sale and sales of interest in subsidiaries   (414,507) (721,682)
Reversal of provision for tax liabilities, net     929,711
Other expenses/income, net (1,002,301) (1,697,786) (1,563,177)
Total Expenses R$ (36,443,026) R$ (42,122,393) R$ (35,782,950)