Exploratory Well and Project Costs - Aging of Capitalized Exploratory Costs (Details) $ in Millions	Dec. 31, 2023 USD ($) Well	Dec. 31, 2022 USD ($) Well	Dec. 31, 2021 USD ($) Well	Dec. 31, 2020 USD ($)
Capitalized Exploratory Well Costs [Abstract]
One year or less	$ 784	$ 834	$ 621
More than one year	0	0	11
Total capitalized exploratory well costs	$ 784	$ 834	$ 632	$ 498
Number of projects with exploratory well costs that have been suspended for a period greater than one year (a) | Well	0	0	3