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Legal proceedings (Details Narrative)
R$ in Millions, $ in Millions
 1 Months Ended 12 Months Ended
Mar. 31, 2022
USD ($)
Mar. 31, 2022
BRL (R$)
Aug. 31, 2020
USD ($)
Aug. 31, 2020
BRL (R$)
Dec. 31, 2023
USD ($)
Dec. 31, 2023
BRL (R$)
Dec. 31, 2022
USD ($)
Dec. 31, 2022
BRL (R$)
IfrsStatementLineItems [Line Items]                
Indemnification payment $ 122 R$ 590     $ 2 R$ 10    
Claim amount received     $ 55 R$ 301        
Gain on other assets         48      
Guarantee Obligations, Bank Guarantee         2,700   $ 2,300  
Cfem Related Proceedings [Member]                
IfrsStatementLineItems [Line Items]                
Estimated Loss on Legal Proceedings         2,132 10,320 1,831 R$ 9,555
Assessments And Legal Proceedings Related To Pis Cofins [Member]                
IfrsStatementLineItems [Line Items]                
Estimated Loss on Legal Proceedings         2,198 10,640 1,720 8,975
Tax On Services [Member]                
IfrsStatementLineItems [Line Items]                
Estimated Loss on Legal Proceedings         738 3,573 626 3,268
Assessments And Legal Proceedings Related To Tax On Services [Member]                
IfrsStatementLineItems [Line Items]                
Estimated Loss on Legal Proceedings         586 2,835 558 2,910
Tax Proceedings Fines Arising From Offsets Not Approved For Settlement Of Federal Debts [Member]                
IfrsStatementLineItems [Line Items]                
Estimated Loss on Legal Proceedings         626 3,032 524 2,735
Environmental Litigations Iron Ore Operations In Itabira [Member]                
IfrsStatementLineItems [Line Items]                
Loss contingency damages sought value         $ 524 R$ 2,538 $ 431 R$ 2,249