Supplemental Balance Sheet Information

3 Months Ended

Mar. 31, 2018

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Supplemental Balance Sheet Information

Supplemental Balance Sheet Information

INVENTORIES

Total inventories consisted of the following:

(millions)	March 31, 2018		December 31, 2017
Finished goods	$	145	$	140
Work in progress	40		39
Raw materials	70		73
Total	$	255	$	252

ACCRUED EXPENSES

Accrued expenses consisted of the following:

(millions)	March 31, 2018		December 31, 2017
Self-insurance reserves	$	14	$	12
Employee compensation	13		17
Interest	13		12
Derivatives	8		9
Pension and other postretirement benefits	17		17
Environmental	16		17
Other	50		51
Total	$	131	$	135

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:

	Three months ended March 31,
(millions)	2018			2017
Balance as of January 1	$	118		$	113
Accretion expense	2			1
Foreign currency translation	(1		)	—
Balance as of March 31	$	119		$	114