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Exploration and evaluation of oil and gas reserves (Tables)
 6 Months Ended
Jun. 30, 2024
Notes and other explanatory information [abstract]  
Schedule of changes in capitalized costs
   
Capitalized Exploratory Well Costs / Capitalized Acquisition Costs (1) Jan-Jun/2024 Jan-Jun/2023
Property plant and equipment    
Opening Balance 1,512 1,876
Additions 184 158
Write-offs (25) (1)
Transfers - (44)
Translation adjustment (198) 155
Closing Balance 1,473 2,144
Intangible assets    
Opening Balance 2,313 2,406
Additions − 147
Write-offs − (36)
Transfers − (31)
Translation adjustment (299) 227
Closing Balance 2,014 2,713
Capitalized Exploratory Well Costs / Capitalized Acquisition Costs 3,487 4,857
(1)  Amounts capitalized and subsequently expensed in the same period have been excluded from this table.
Schedule of exploration costs
       
  Jan-Jun/2024 Jan-Jun/2023 Apr-Jun/2024 Apr-Jun/2023
Exploration costs recognized in the statement of income        
Geological and geophysical expenses (193) (317) (111) (192)
Exploration expenditures written off (includes dry wells and signature bonuses) (105) (38) (55) (6)
Contractual penalties on local content requirements (4) 7 (2) 7
Other exploration expenses (7) - (5) -
Total expenses (309) (348) (173) (191)
Cash used in:        
Operating activities 200 317 116 192
Investment activities 271 306 144 241
Total cash used 471 623 260 433