CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Cash Flows from Operating Activities:
Net loss	$ (30)	$ (41)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Depreciation, depletion and amortization	47	48
Deferred income taxes	(3)	3
Share-based compensation expense	8	7
Amortization of deferred debt issuance costs and discount on debt	2	5
Impairment loss	0	25
Loss on extinguishment of debt	2	0
Other non-cash affecting net loss	6	10
Changes in assets and liabilities:
Decrease in accounts receivable, net	19	1
Increase in inventories, net	(10)	(9)
Increase in prepaid and other assets	(1)	(1)
Increase (decrease) in accounts payable and accrued liabilities	8	(47)
Net changes in income tax payables and receivables	(3)	(2)
Changes in other non-current assets and liabilities	(6)	(3)
Cash provided by (used in) operating activities	39	(4)
Cash Flows from Investing Activities:
Capital expenditures	(25)	(28)
Loans	(25)	0
Cash used in investing activities	(50)	(28)
Cash Flows from Financing Activities:
Repayments of long-term debt	(101)	(6)
Proceeds from Short-term Debt	94	0
Proceeds from long-term debt	222	0
Acquisition of noncontrolling interest	(148)	0
Debt issuance costs	(4)	(1)
Proceeds from the exercise of warrants	0	2
Dividends paid	(7)	(6)
Restricted stock and performance-based shares settled in cash for withholding taxes	(6)	(4)
Cash provided by (used in) financing activities	50	(15)
Effects of exchange rate changes on cash and cash equivalents and restricted cash	(1)	7
Net increase (decrease) in cash, cash equivalents and restricted cash	38	(40)
Cash, cash equivalents and restricted cash at beginning of period	1,696	1,769
Cash, cash equivalents and restricted cash at end of period	$ 1,734	$ 1,729