Asset Retirement Obligations

6 Months Ended

Jun. 30, 2020

Asset Retirement Obligation Disclosure [Abstract]

Asset Retirement Obligations

Asset Retirement Obligations

Asset retirement obligations consist primarily of rehabilitation and restoration costs, landfill capping costs, decommissioning costs, and closure and post-closure costs. Activities related to asset retirement obligations were as follows:

	Three Months Ended June 30,				Six Months Ended June 30,
	2020		2019		2020		2019
Beginning balance	$	142	$	75	$	158	$	74
Additions	—		6		—		6
Accretion expense	2		3		5		4
Remeasurement/translation	12		—		(9)		—
Other, including change in estimates	—		—		—		—
Settlements/payments	(1)		(1)		(3)		(1)
Transferred with the divestiture of Ashtabula	—		(3)		—		(3)
Transferred in with the acquisition of Cristal	—		94		—		94
Other acquisition and divestiture related	—		—		4		—
Balance, June 30,	$	155	$	174	$	155	$	174

	June 30, 2020		December 31, 2019
Current portion included in “Accrued liabilities”	$	10	$	16
Noncurrent portion included in “Asset retirement obligations”	145		142
Asset retirement obligations	$	155	$	158