Asset Retirement Obligations (Tables)

9 Months Ended

Sep. 30, 2019

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 were as follows:

	September 30,
(In millions)	2019			2018
Beginning balance	$	1,145		$	1,483
Incurred liabilities, including acquisitions	25			10
Settled liabilities, including dispositions	(1,106		)	(105		)
Accretion expense (included in depreciation, depletion and amortization)	29			53
Revisions of estimates	15			(130		)
Held for sale	108			(10		)
Ending balance	$	216		$	1,301