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EXPENSES BY NATURE - Classified by function (Details) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
EXPENSES BY NATURE      
Cost of sales R$ (35,440,726) R$ (40,010,100) R$ (33,312,995)
Selling expenses (476,339) (570,431) (524,965)
General and administrative expenses (954,117) (1,082,449) (1,129,943)
Other operating income 636,847 235,421 260,618
Other operating expenses (187,647) (270,413) (168,887)
Impairment of financial assets (21,044) (9,914)  
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
Total Expenses R$ (36,443,026) R$ (42,122,393) R$ (35,782,950)