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Exploration and evaluation of oil and gas reserves (Details 2) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
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Notes and other explanatory information [abstract] |  |
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

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