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Inventories (Tables)
12 Months Ended
Dec. 31, 2024
Notes and other explanatory information [abstract]  
Schedule of inventories
   
  December 31, 2024 December 31, 2023
Finished products    
Iron Solutions 2,493 2,457
Energy Transition Metals 571 640
Total finished products 3,064 3,097
     
Work in progress 691 567
Consumable inventory 988 1,159
     
Net realizable value provision (i) (138) (139)
Total of inventories 4,605 4,684

(i) In 2024, the effect of provision for net realizable value was US$35 (2023: US$54 and 2022: US$44).