Asset Retirement Obligations (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Beginning balance as of January 1	$ 340	$ 316
Incurred liabilities, including acquisitions	4	10
Settled liabilities, including dispositions	(27)	(8)
Accretion expense (included in depreciation, depletion and amortization)	11	11
Revisions of estimates	12	(1)
Ending balance as of September 30, total	340	328
Ending balance as of September 30, short-term	$ 32	$ 45