Asset Retirement Obligations

3 Months Ended

Mar. 31, 2019

Asset Retirement Obligation [Abstract]

Asset retirement obligations activity is as follows:



	Three Months Ended March 31,
	2019			2018
	(in millions)
Beginning asset retirement obligations	$	183		$	271
New wells placed on production	—			1
Changes in estimates	—			2
Obligations reclassified to liabilities held for sale	—			(6		)
Liabilities settled	(6		)	(9		)
Accretion of discount	3			4
Ending asset retirement obligations	$	180		$	263

The Company records the current and noncurrent portions of asset retirement obligations in other current liabilities and other liabilities, respectively, in the consolidated balance sheets. As of March 31, 2019 and December 31, 2018, the current portions of the Company's asset retirement obligations were $31 million and $25 million, respectively.