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Basis of preparation of financial statements (Details Narrative)
R$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2022
USD ($)
Dec. 31, 2022
BRL (R$)
Dec. 31, 2019
USD ($)
Dec. 31, 2019
BRL (R$)
IfrsStatementLineItems [Line Items]        
Acquisition new steel     $ 496  
Provision amount $ 57      
Provision amount 1,093      
Outstanding balances related suppliers 202      
Indemnity Agreements 1 [Member]        
IfrsStatementLineItems [Line Items]        
Provision amount $ 7      
Indemnity Agreements 2 [Member]        
IfrsStatementLineItems [Line Items]        
Provision amount | R$   R$ 39    
Vale Inc [Member]        
IfrsStatementLineItems [Line Items]        
Acquisition new steel | R$       R$ 1,884
Provision amount | R$   R$ 292