Asset Retirement Obligations (Tables)

6 Months Ended

Jun. 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 six months ended June 30 were as follows:

	June 30,
(In millions)	2020		2019
Beginning balance as of January 1	$	255	$	1,145
Incurred liabilities, including acquisitions	2		18
Settled liabilities, including dispositions	(3)		(129)
Accretion expense (included in depreciation, depletion and amortization)	6		26
Revisions of estimates	(8)		11
Held for sale	—		(864)
Ending balance as of June 30	$	252	$	207