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Exploration and evaluation of oil and gas reserves (Tables) | 12 Months Ended
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Dec. 31, 2023
Notes and other explanatory information [abstract] |
Schedule of changes in capitalized costs |
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 |
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 |
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 |
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. |  |

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