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EXPENSES BY NATURE - Classified by function (Details) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
EXPENSES BY NATURE      
Cost of sales R$ (40,010,100) R$ (33,312,995) R$ (34,187,941)
Selling expenses (570,431) (524,965) (710,766)
Allowance for doubtful accounts (9,914)    
General and administrative expenses (1,082,449) (1,129,943) (1,528,262)
Other operating income 235,421 260,618 242,077
Other operating expenses (270,413) (168,887) (114,230)
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  
Total Expenses R$ (42,122,393) R$ (35,782,950) R$ (39,275,256)