Accounting for Suspended Exploratory Wells - Summary of Changes and Aging of Capitalized Well Costs (Details) $ in Millions	12 Months Ended
	Dec. 31, 2022 USD ($) Project	Dec. 31, 2021 USD ($) Project	Dec. 31, 2020 USD ($) Project
Changes in company's suspended exploratory well costs
Beginning balance at January 1	$ 2,109	$ 2,512	$ 3,041
Additions to capitalized exploratory well costs pending the determination of proved reserves	72	56	28
Reclassifications to wells, facilities and equipment based on the determination of proved reserves	(481)	(425)	(102)
Capitalized exploratory well costs charged to expense	(73)	(34)	(667)
Other reductions	0	0	212
Ending balance at December 31	1,627	2,109	2,512
Aging of capitalized well costs and number of project
Exploratory well costs capitalized for a period of one year or less	73	65	26
Exploratory well costs capitalized for a period greater than one year	1,554	2,044	2,486
Balance at December 31	$ 1,627	$ 2,109	$ 2,512
Number of projects with exploratory well costs that have been capitalized for a period greater than one year (in projects) | Project	12	15	17