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Exploration and evaluation of oil and gas reserves (Details 2) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
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