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EXPENSES BY NATURE - Classified by function (Details) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
EXPENSES BY NATURE      
Cost of sales R$ (37,884,102) R$ (35,440,726) R$ (40,010,100)
Selling expenses (512,950) (476,339) (570,431)
General and administrative expenses (1,017,435) (954,117) (1,082,449)
Other operating income 1,763,684 636,847 235,421
Other operating expenses (645,985) (187,647) (270,413)
Impairment of financial assets (64,132) (21,044) (9,914)
Impairment of non-financial assets (411,925) 0 0
Gains and losses on assets held for sale and sales of interest in subsidiaries 0 0 (414,507)
Total Expenses R$ (38,772,845) R$ (36,443,026) R$ (42,122,393)