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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, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Exploration costs recognized in the statement of income        
Geological and geophysical expenses $ (111) $ (192) $ (193) $ (317)
Exploration expenditures written off (includes dry wells and signature bonuses) (55) (6) (105) (38)
Contractual penalties on local content requirements (2) 7 (4) 7
Other exploration expenses (5) (7)
Total expenses (173) (191) (309) (348)
Cash used in:        
Operating activities 116 192 200 317
Investment activities 144 241 271 306
Total cash used $ 260 $ 433 $ 471 $ 623