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Legal and administrative proceedings (Tables)
 12 Months Ended
Dec. 31, 2024
Notes and other explanatory information [abstract]  
Schedule of effects in income statements
     
  2024 2023 2022
Tax litigations (80) 8 (40)
Civil litigations (29) (70) (38)
Labor litigations (191) (167) (67)
Environmental litigations (3) - (8)
  Total (303) (229) (153)
Schedule of changes in provision for litigations
         
  Tax litigation Civil litigation Labor litigation Environmental litigation Total of litigation provision
Balance as of December 31, 2023 90 380 514 15 999
Additions and reversals, net 80 29 191 3 303
Payments (15) (72) (111) - (198)
Indexation and interest 71 31 8 2 112
Acquisition of Aliança Energia - 6 - 27 33
Translation adjustment (25) (84) (120) (7) (236)
Balance as of December 31, 2024 201 290 482 40 1,013
Schedule of contingent liabilities
   
  December 31, 2024 December 31, 2023
Tax litigations 5,995 7,235
Civil litigations 1,274 1,366
Labor litigations 292 378
Environmental litigations 1,050 1,320
Total 8,611 10,299
Schedule of judicial deposits
   
  December 31, 2024 December 31, 2023
Tax litigations 338 516
Civil litigations 78 122
Labor litigations 110 148
Environmental litigations 11 12
Total 537 798