Supplemental Balance Sheet Information (Tables)

9 Months Ended

Sep. 30, 2018

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Schedule of inventories

Total inventories consisted of the following:

(millions)	September 30, 2018		December 31, 2017
Finished goods	$	167	$	140
Work in progress	43		39
Raw materials	78		73
Total	$	288	$	252

Schedule of accrued expenses

Accrued expenses consisted of the following:

(millions)	September 30, 2018		December 31, 2017
Self-insurance reserves	$	14	$	12
Employee compensation	13		17
Interest	13		12
Derivatives	5		9
Pension and other postretirement benefits	17		17
Environmental	12		17
Other	58		51
Total	$	132	$	135

Changes in the liability for asset retirement obligations

Changes in the liability for asset retirement obligations, which are included in "Other liabilities" on our condensed consolidated balance sheets, consisted of the following:

	Nine months ended September 30,
(millions)	2018			2017
Balance as of January 1	$	118		$	113
Accretion expense	5			5
Liabilities incurred	—			3
Changes in estimated cash flows	(5		)	(4		)
Liabilities settled	(1		)	(1		)
Foreign currency translation	—			2
Balance as of September 30	$	117		$	118