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Exploration and evaluation of oil and gas reserves (Tables)
 12 Months Ended
Dec. 31, 2024
Notes and other explanatory information [abstract]  
Schedule of changes in capitalized costs
   
Capitalized Exploratory Well Costs / Capitalized Acquisition Costs (1) 2024 2023
Property plant and equipment    
Opening Balance 1,512 1,876
Additions 338 505
Write-offs (27) (8)
Transfers (3) (1,000)
Translation adjustment (345) 139
Closing Balance 1,475 1,512
Intangible assets    
Opening Balance 2,313 2,406
Additions 20 147
Write-offs (19) (41)
Transfers − (16)
Losses on exploration expenditures written off (224) (364)
Translation adjustment (481) 181
Closing Balance 1,609 2,313
Capitalized Exploratory Well Costs / Capitalized Acquisition Costs 3,084 3,825
(1) Amounts capitalized and subsequently expensed in the same period have been excluded from this table.    
Schedule of exploration costs
     
  2024 2023 2022
Exploration costs recognized in the statement of income      
Geological and geophysical expenses (412) (566) (358)
Exploration expenditures written off (includes dry wells and signature bonuses (1) (482) (421) (248)
Contractual penalties on local content requirements (5) 12 (47)
Other exploration expenses (14) (7) (34)
Total expenses (913) (982) (687)
Cash used in:      
Operating activities 426 573 393
Investment activities 582 672 555
Total cash used 1,008 1,245 948
(1) It includes amounts relating to economic unfeasibility of exploratory blocks (note 25).      
Schedule of aging of capitalized exploratory well costs
   
Aging of capitalized exploratory well costs (1) 2024 2023
Exploratory well costs capitalized for a period of one year 311 211
Exploratory well costs capitalized for a period greater than one year 1,164 1,301
Total capitalized exploratory well costs 1,475 1,512
Number of projects relating to exploratory well costs capitalized for a period greater than one year 18 17
Schedule of exploratory well costs
   
  Capitalized costs (2024) Number of wells
2023 76 2
2022 209 3
2021 73 2
2020 17 1
2019 and previous years 789 14
Exploratory well costs that have been capitalized for a period greater than one year 1,164 22
(1) Amounts paid for obtaining rights and concessions for exploration of oil and gas (capitalized acquisition costs) are not included.