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Intangibles (Tables)
 12 Months Ended
Dec. 31, 2024
Notes and other explanatory information [abstract]  
Schedule of movements in intangibles
           
  Notes Goodwill Concessions Software Research and development project Total
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)
Transfers 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
Additions   - 465 54 - 519
Disposals   - (10) - (5) (15)
Amortization   - (270) (54) - (324)
Acquisition of Aliança Energia 17(c) 257 824 - 4 1,085
Translation adjustment   (482) (1,756) (20) (124) (2,382)
Balance as of December 31, 2024   3,038 6,942 84 450 10,514
Cost   3,038 8,528 579 450 12,595
Accumulated amortization   - (1,586) (495) - (2,081)
Balance as of December 31, 2024   3,038 6,942 84 450 10,514
Schedule of estimated useful lives of intangibles
   
    Useful life
Railway concessions   5 to 33 years
Research and development project   19 years
Software   5 years