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Inventories (Tables)
 12 Months Ended
Dec. 31, 2023
Notes and other explanatory information [abstract]  
Schedule of inventories
     
   
  December 31, 2023 December 31, 2022
Finished products    
Iron Ore Solutions 2,457 2,126
Energy Transition Metals 640 651
Total finished products  3,097 2,777
     
Work in progress 567 800
Consumable inventory 1,159 1,010
     
Net realizable value provision (i) (139) (105)
Total of inventories 4,684 4,482
(i) In 2023, the effect of provision for net realizable value was US$54 (2022: US$44).