CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
OPERATING ACTIVITIES:
Net (loss) income	$ (89)	$ (66)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization expense	104	103
Amortization of long-term debt deferred financing costs	3	4
Gain (loss) on asset sales	(6)	0
Impairment charges	1	19
Loss on extinguishment of debt	13	0
Provision for doubtful accounts	3	0
Stock-based compensation expense	11	9
Equity in net income (loss) from unconsolidated investments	(1)	(4)
Dividends from unconsolidated investments	0	1
Deferred income taxes	(6)	(8)
Other, net	(3)	1
Change in restricted funds held in trust	(1)	3
Change in working capital, net of effects of acquisitions	(15)	0
Net cash provided by operating activities	26	62
INVESTING ACTIVITIES:
Purchase of property, plant and equipment	(152)	(184)
Acquisition of business, net of cash acquired	(16)	(9)
Property insurance proceeds	5	0
Other, net	(3)	2
Net cash (used in) provided by investing activities	(166)	(191)
FINANCING ACTIVITIES:
Proceeds from borrowings on long-term debt	400	0
Proceeds from borrowings on revolving credit facility	633	515
Proceeds from borrowings on Dublin project financing	60	77
Payments of borrowings on revolving credit facility	(501)	(370)
Payments on long-term debt	(412)	(1)
Payments on equipment financing capital lease	(2)	(2)
Payments on project debt	(12)	(9)
Payments of deferred financing costs	(9)	(3)
Cash dividends paid to stockholders	(65)	(65)
Change in restricted funds held in trust	5	18
Common stock repurchased	0	(20)
Other, net	4	(1)
Net cash provided by (used in) financing activities	101	139
Effect of exchange rate changes on cash and cash equivalents	3	2
Net (decrease) increase in cash and cash equivalents	(36)	12
Cash and cash equivalents at beginning of period	84	96
Cash and cash equivalents at end of period	$ 48	$ 108