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Exploration costs recognized in the statement of income and cash used in oil and gas exploration and evaluation activities are set out in the following table: (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Exploration costs recognized in the statement of income        
Geological and geophysical expenses $ 83 $ 87 $ 136 $ 154
Exploration expenditures written off (includes dry wells and signature bonuses) 71 56 94 187
Contractual penalties on local content requirements [1] (110) 28 (108) 43
Other exploration expenses 19 1 21
Total expenses 44 190 123 405
Cash used in :        
Operating activities 81 106 135 174
Investment activities 904 130 980 245
Total cash used $ 985 $ 236 $ 1,115 $ 419
[1] There was a  US$ 127 reversal on June 30, 2022, as described in note 30.