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22 EXPENSES BY NATURE (Details 1) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
ExpensesByNatureLineItems [Line Items]      
Production costs R$ 17,263,264 R$ 16,105,657 R$ 13,596,141
Sales expenses 2,342,805 2,263,688 1,815,107
General and Administrative Expenses 511,065 494,023 415,841
Other operating expenses 4,631,236 (83,332) 1,944,495
Net 2,406,851 1,330,706 646,944
Depreciation Amortization and Depletion [Member]      
ExpensesByNatureLineItems [Line Items]      
Production costs 1,385,306 1,145,793 1,376,862
Sales expenses 11,539 5,850 8,851
General and Administrative Expenses 24,859 23,464 23,052
Total 1,421,704 1,175,107 1,408,765
Other operating expenses [1] 97,627 97,914 44,570
Net R$ 1,519,331 R$ 1,273,021 R$ 1,453,335
[1] Refers mainly to depreciation and amortization of paralyzed assets as described in note 23.