CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
OPERATING ACTIVITIES:
Net (loss) income			$ (2)	$ 143
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization expense	$ 55	$ 53	165	162
Amortization of deferred debt financing costs			3	4
Net gain on sale of business and investments	1	7	49	217
Impairment charges	2	49	3	86
Gain (Loss) on Extinguishment of Debt	0	(3)	0	(3)
Stock-based compensation expense	5	4	20	18
Equity in net income from unconsolidated investments	1	1	4	3
Increase (Decrease) in Deferred Income Taxes			9	32
SEC Schedule, 12-04, Cash Dividends Paid to Registrant, 50 Percent or Less Owned Persons			5	1
Other, net			5	(5)
Change in working capital, net of effects of acquisitions and dispositions			(33)	(14)
Changes in noncurrent assets and liabilities, net			8	1
Net cash provided by operating activities			112	147
INVESTING ACTIVITIES:
Purchase of property, plant and equipment			(121)	(158)
Acquisition of businesses, net of cash acquired			2	(50)
Proceeds from the sale of assets, net of restricted cash			28	125
Property insurance proceeds			0	7
Investment in equity affiliate			9	0
Payment of indemnification claim from sale of asset			0	(7)
Other, net			1	4
Net cash used in investing activities			(101)	(87)
FINANCING ACTIVITIES:
Proceeds from borrowings on long-term debt			75	765
Proceeds from borrowings on revolving credit facility			441	474
Payments on long-term debt			(12)	(532)
Payments on revolving credit facility			(375)	(713)
Payments on project debt			(16)	(21)
Payment of deferred financing costs			1	9
Cash dividends paid to stockholders			(100)	(98)
Payments For Insurance Premium			(20)	(20)
Other, net			(8)	(4)
Net cash used in financing activities			(16)	(158)
Effect of exchange rate changes on cash, cash equivalents and restricted cash			(2)	2
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect			(7)	(96)
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	98	98	98	98
Cash, cash equivalents and restricted cash at end of period	65	51	65	51
Restricted funds held in trust	25	39	25	39
Restricted funds held in trust	$ 8	$ 8	$ 8	$ 8