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Exploration and evaluation of oil and gas reserves (Tables)
 6 Months Ended
Jun. 30, 2025
Notes and other explanatory information [abstract]  
Schedule of changes in capitalized costs
   
Capitalized Exploratory Well Costs / Capitalized Acquisition Costs (1) Jan-Jun/2025 Jan-Jun/2024
Property plant and equipment    
Opening Balance 1,475 1,512
Additions 501 184
Write-offs (4) (25)
Transfers (84) −
Translation adjustment 196 (198)
Losses on exploration expenditures written off (44) −
Closing Balance 2,040 1,473
Intangible assets    
Opening Balance 1,609 2,313
Losses on exploration expenditures written off (164) −
Translation adjustment 208 (299)
Closing Balance 1,653 2,014
Capitalized Exploratory Well Costs / Capitalized Acquisition Costs 3,693 3,487
(1) Amounts capitalized and subsequently expensed in the same period have been excluded from this table.    
Schedule of exploration costs
       
  Jan-Jun/2025 Jan-Jun/2024 Apr-Jun/2025 Apr-Jun/2024
Exploration costs recognized in the statement of income        
Geological and geophysical expenses (274) (193) (183) (111)
Exploration expenditures written off (includes dry wells and signature bonuses) (209) (105) - (55)
Contractual penalties on local content requirements (5) (4) - (2)
Other exploration expenses (10) (7) (2) (5)
Total expenses (498) (309) (185) (173)
Cash used in:        
Operating activities 284 200 185 116
Investment activities 503 271 262 144
Total cash used 787 471 447 260