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28. FINANCIAL INCOME (EXPENSES) (Details Narrative) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Financial Income      
Updated shares - Fair value through profit or loss (Note 14 II) [1] R$ 1,190,489
Recognition of the exclusion of ICMS in the PIS and COFINS 81,758 R$ 160,609  
Receivables for indemnity R$ 369,571    
[1] It refers to the appreciation of Usiminas' shares in the amount of R$1,190,489 as of December31, 2020. As of December 31, 2019, Usiminas' shares were reclassified to financial investments and their pricing fluctuation started to be recognized in the financial result.