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Exploration and evaluation of oil and gas reserves (Tables)
 12 Months Ended
Dec. 31, 2023
Notes and other explanatory information [abstract]  
Schedule of changes in capitalized costs
   
Capitalized Exploratory Well Costs / Capitalized Acquisition Costs (1) 2023 2022
Property plant and equipment    
Opening Balance 1,876 1,994
Additions 505 379
Write-offs (8) (545)
Transfers (1,000) (83)
Translation adjustment 139 131
Closing Balance 1,512 1,876
Intangible assets    
Opening Balance 2,406 2,576
Additions 147 840
Write-offs (41) −
Transfers (16) (1,187)
Losses on exploration expenditures written off (364) −
Translation adjustment 181 177
Closing Balance 2,313 2,406
Capitalized Exploratory Well Costs / Capitalized Acquisition Costs 3,825 4,282
(1) Amounts capitalized and subsequently expensed in the same period have been excluded from this table.    

 
Schedule of exploration costs
     
  2023 2022 2021
Exploration costs recognized in the statement of income      
Geological and geophysical expenses (566) (342) (358)
Exploration expenditures written off (includes dry wells and signature bonuses) (421) (691) (248)
Contractual penalties on local content requirements 12 165 (47)
Other exploration expenses (7) (19) (34)
Total expenses (982) (887) (687)
Cash used in:      
Operating activities 574 360 393
Investment activities 671 1,253 555
Total cash used 1,245 1,613 948
Schedule of aging of capitalized exploratory well costs
     
Aging of capitalized exploratory well costs (1) 2023 2022
Exploratory well costs capitalized for a period of one year 211 406
Exploratory well costs capitalized for a period greater than one year 1,301 1,470
Total capitalized exploratory well costs 1,512 1,876
Number of projects relating to exploratory well costs capitalized for a period greater than one year 17 15
Schedule of exploratory well costs
   
  Capitalized costs (2023) Number of wells
2022 238 3
2021 87 2
2020 20 1
2018 and previous years 956 16
Exploratory well costs that have been capitalized for a period greater than one year 1,301 22
(1) Amounts paid for obtaining rights and concessions for exploration of oil and gas (capitalized acquisition costs) are not included.