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Inventories (Tables)
 12 Months Ended
Dec. 31, 2023
Notes and other explanatory information [abstract]  
Schedule of inventories
   
  12.31.2023 12.31.2022
Crude oil 3,375 3,738
Oil products 2,196 3,278
Intermediate products 635 587
Natural gas and Liquefied Natural Gas (LNG) 78 135
Biofuels 13 14
Fertilizers 1 4
Total products 6,298 7,756
Materials, supplies and others 1,383 1,023
Total 7,681 8,779