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Schedule of financial investment (Details) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
IfrsStatementLineItems [Line Items]    
Current [1] R$ 2,644,732 R$ 3,783,362
NonCurrent [1] 147,671 123,409
Investment [Member]    
IfrsStatementLineItems [Line Items]    
Current [2] 261,673 478,253
NonCurrent [2] 15,148  
Usiminas Shares [Member]    
IfrsStatementLineItems [Line Items]    
Current [3] 2,383,059 3,305,109
NonCurrent [3] R$ 132,523 R$ 123,409
[1] onds
[2] 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.
[3] art of the shares guarantees a portion of the Company's debt