Asset Retirement Obligations (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Beginning balance as of January 1			$ 316	$ 254
Incurred liabilities, including acquisitions			8	6
Settled liabilities, including dispositions			(3)	(2)
Accretion expense (included in depreciation, depletion and amortization)			7	6
Revisions of estimates			(5)	32
Ending balance as of June 30, total	$ 323	$ 296	323	296
Asset retirement obligation, current	46	24	46	24
Impairments	$ 2		$ 2	22
Gulf of Mexico
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Beginning balance as of January 1				7
Ending balance as of June 30, total		29		29
Asset retirement obligation, current		14		$ 14
Impairments		$ 22