Asset Retirement Obligations (Tables)

9 Months Ended

Sep. 30, 2020

Asset Retirement Obligation Disclosure [Abstract]

Schedule of Changes in Asset Retirement Obligations

Asset retirement obligations primarily consist of estimated costs to remove, dismantle and restore land or seabed at the end of oil and gas production operations. Changes in asset retirement obligations for the nine months ended September 30 were as follows:

	September 30,
(In millions)	2020		2019
Beginning balance as of January 1	$	255	$	1,145
Incurred liabilities, including acquisitions	3		25
Settled liabilities, including dispositions	(11)		(1,106)
Accretion expense (included in depreciation, depletion and amortization)	9		29
Revisions of estimates	(8)		15
Held for sale	—		108
Ending balance as of September 30	$	248	$	216