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Exploration and evaluation of oil and gas reserves (Details 2) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021
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Exploration And Evaluation Of Oil And Gas Reserves |  |
Exploratory well costs capitalized for a period of one year | $ 406 | $ 136
Exploratory well costs capitalized for a period greater than one year | 1,470 | 1,858
Total capitalized exploratory well costs | 1,876 | 1,994
Number of projects relating to exploratory well costs capitalized for a period greater than one year | $ 15 | $ 22

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