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v3.25.1

Exploration and evaluation of oil and gas reserves (Details 2) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
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Notes and other explanatory information [abstract] |  |
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

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