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Intangibles (Tables)
 12 Months Ended
Dec. 31, 2023
Notes and other explanatory information [abstract]  
Schedule of movements in intangibles
         
  Goodwill Concessions Software Research and development project Total
Balance as of December 31, 2021 3,208 5,223 86 494 9,011
Additions - 1,087 39 - 1,126
Disposals - (13) - - (13)
Amortization - (229) (43) - (272)
Translation adjustment (19) 366 5 34 386
Balance as of December 31, 2022 3,189 6,434 87 528 10,238
Cost 3,189 7,808 564 528 12,089
Accumulated amortization - (1,374) (477) - (1,851)
Balance as of December 31, 2022 3,189 6,434 87 528 10,238
Additions - 1,013 53 6 1,072
Disposals - (14) - - (14)
Amortization - (251) (41) - (292)
Transfer to held for sale (PTVI) (68) - (1) - (69)
Translation adjustment 142 507 6 41 696
Balance as of December 31, 2023 3,263 7,689 104 575 11,631
Cost 3,263 9,394 634 575 13,866
Accumulated amortization - (1,705) (530) - (2,235)
Balance as of December 31, 2023 3,263 7,689 104 575 11,631
Schedule of estimated useful lives of intangibles
   
    Useful life
Railway concessions   5 to 37 years
Research and development project   19 years
Software   5 years