SUPPLEMENTARY INFORMATION Supplementary Information (Tables)

3 Months Ended

Mar. 31, 2018

Supplemental Cash Flow Elements [Abstract]

Schedule of Pass Through Costs

Pass through costs were as follows (in millions):

	Three Months Ended March 31,
	2018		2017
Pass through costs	$	14	$	10

Schedule of Other Operating Cost and Expense, by Component

We recorded insurance gains, as a reduction to "Other operating expense, net," in our condensed consolidated statement of operations as follows (in millions):

	Three Months Ended March 31,
	2018		2017
Insurance gains for property and clean-up costs, net of impairment charges	$	7	$	1
Insurance gains for business interruption costs, net of costs incurred	$	7	$	1