Exploratory Well and Project Costs - Schedule of Capitalized Exploratory Well And Project Activity (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Increase (Decrease) in Capitalized Exploratory Well Costs that are Pending Determination of Proved Reserves [Roll Forward]
Beginning capitalized exploratory well and project costs	$ 498	$ 660
Additions to exploratory well and project costs pending the determination of proved reserves	2,935	1,163
Additions to capitalized exploratory well and project costs from acquisitions	235	0
Reclassification due to determination of proved reserves	(2,973)	(1,325)
Disposition of assets	(63)	0
Ending capitalized exploratory well and project costs	$ 632	$ 498