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EXPENSES BY NATURE - Classified by nature (Details) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
EXPENSES BY NATURE      
Depreciation and amortisation R$ (1,891,814) R$ (2,092,551) R$ (2,535,955)
Labor expenses (5,724,352) (5,514,721) (6,508,834)
Raw material and consumption material (29,623,418) (23,423,950) (22,863,693)
Freight (2,770,516) (2,281,773) (2,279,459)
Impairment of assets   (1,114,807) (2,917,911)
Gains and losses on assets held for sale and sales of interest in subsidiaries (414,507) (721,682) (58,223)
Reversal of provision for tax liabilities, net   929,711  
Other expenses/income, net (1,697,786) (1,563,177) (2,111,181)
Total Expenses R$ (42,122,393) R$ (35,782,950) R$ (39,275,256)