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5. FINANCIAL INVESTMENTS (Details) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
DisclosureOfFinancialInvestmentsLineItems [Line Items]    
Current R$ 3,783,362 R$ 2,633,173
NonCurrent 123,409 95,719
Investments [member]    
DisclosureOfFinancialInvestmentsLineItems [Line Items]    
Current [1] 478,253 518,553
Usiminas shares [member]    
DisclosureOfFinancialInvestmentsLineItems [Line Items]    
Current [2] 3,305,109 2,114,620
Bonds [member]    
DisclosureOfFinancialInvestmentsLineItems [Line Items]    
Current [3]
NonCurrent [3] R$ 123,409 R$ 95,719
[1] These are restricted financial investments and linked to a Bank Deposit Certificate (CDB) to guarantee a letter of guarantee from financial institutions and financial investments in Public Securities (LFT - Letras Financeiras do Tesouro) managed by their exclusive funds.
[2] Part of the shares guarantees a portion of the Company's debt.
[3] Bonds with Fibra bank due in February 2028 (see note 22).