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Exploration and evaluation of oil and gas reserves (Details 1) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Exploration costs recognized in the statement of income        
Geological and geophysical expenses $ (183) $ (111) $ (274) $ (193)
Exploration expenditures written off (includes dry wells and signature bonuses) (55) (209) (105)
Contractual penalties on local content requirements (2) (5) (4)
Other exploration expenses (2) (5) (10) (7)
Total expenses (185) (173) (498) (309)
Cash used in:        
Operating activities 185 116 284 200
Investment activities 262 144 503 271
Total cash used $ 447 $ 260 $ 787 $ 471