Exploratory Well Costs (Details) $ in Millions	3 Months Ended
	Mar. 31, 2022 USD ($)
Capitalized Exploratory Well Costs that are Pending Determination of Proved Reserves [Roll Forward]
Balance at January 1	$ 7
Additions Pending the Determination of Proved Reserves	16
Reclassifications to Proved Properties	(12)
Costs Charged to Expense (1)	(1)	[1]
Balance at March 31	$ 10

[1] Includes capitalized exploratory well costs charged to either dry hole costs or impairments.