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Accounts receivable (Tables)
 12 Months Ended
Dec. 31, 2024
Notes and other explanatory information [abstract]  
Schedule of accounts receivable
     
  Notes December 31, 2024 December 31, 2023
Receivables from contracts with customers      
Third parties      
Iron Solutions   1,540 3,406
Energy Transition Metals   788 743
Other   19 3
Related parties 32 63 89
Accounts receivable   2,410 4,241
Expected credit loss   (52) (44)
Accounts receivable, net   2,358 4,197
Schedule of sensitivity of the company's risk on final settlement
       
  December 31, 2024
  Thousand metric tons Provisional price (US$/ton) Variation

Effect on Revenue

(US$ million)

Iron ore 19,621 101 +/- 10% +/- 198
Copper 69 8,479 +/- 10% +/- 58