v3.26.1
Intangible assets (Tables)
6 Months Ended
Jun. 30, 2026
Notes and other explanatory information [abstract]  
Schedule of movements in intangibles
             
  Notes Goodwill Concessions Software Research and development projects Patents Total
Balance as of December 31, 2025   1,297 7,091 80 2 483 8,953
Additions   101 16 117
Disposals  
Amortization   (150) (22) (36) (208)
Translation adjustment   82 443 5 30 560
Balance as of June 30, 2026   1,379 7,485 79 2 477 9,422
Cost   1,379 9,729 697 2 531 12,338
Accumulated amortization   (2,244) (618) (54) (2,916)
Balance as of June 30, 2026   1,379 7,485 79 2 477 9,422
               
Balance as of December 31, 2024   3,038 6,942 84 450 10,514
Additions   149 15 164
Disposals   (4) (4)
Amortization   (137) (22) (159)
Impairment   (117) (117)
Transfer to held for sale 27(a) (131) (770) (3) (904)
Translation adjustment   262 895 10 59 1,226
Balance as of June 30, 2025   3,052 7,075 87 506 10,720
Cost   3,052 8,943 653 506 13,154
Accumulated amortization   (1,868) (566) (2,434)
Balance as of June 30, 2025   3,052 7,075 87 506 10,720