CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Cash flows from operating activities:
Net income (loss)	$ 17	$ (137)	$ (158)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization	263	304	320
Impairment of goodwill, intangibles and other assets	1	69	0
Amortization of debt issuance costs and discounts	38	23	16
Share-based compensation	35	27	31
Debt extinguishment costs	65	0	0
Deferred Income Taxes and Tax Credits	(9)	(44)	(142)
Unrealized gain on forward interest rate swaps	(2)	0	(4)
Other, net	4	3	14
Changes in operating assets and liabilities:
Accounts receivable, net	161	34	2
Inventories, net	(110)	34	(13)
Other assets	16	7	(7)
Accounts payable	(40)	125	(21)
Accrued liabilities	4	(29)	(5)
Deferred revenue	17	7	16
Income taxes	26	(41)	47
Other operating activities	(8)	(2)	26
Net cash provided by operating activities	478	380	122
Cash flows from investing activities:
Acquisition of businesses, net of cash acquired	0	0	(52)
Purchases of property, plant and equipment	(50)	(77)	(122)
Proceeds from the sale of a business	0	39	0
Proceeds from the sale of long-term investments	0	0	3
Purchases of long-term investments	(1)	(1)	(1)
Purchases of investments and marketable securities	0	0	(1)
Proceeds from sales of investments and marketable securities	0	0	25
Net cash used in investing activities	(51)	(39)	(148)
Cash flows from financing activities:
Payments of debt issuance costs and discounts	(5)	(5)	0
Proceeds from issuance of long-term debt	1,371	102	0
Payments of long term-debt	(1,825)	(484)	(165)
Payments of debt extinguishment costs	(65)	0	0
Proceeds from exercise of stock options and stock purchase plan purchases	12	11	17
Taxes paid related to net share settlement of equity awards	(5)	(8)	(13)
Net cash used in financing activities	(517)	(384)	(161)
Effect of exchange rate changes on cash	(4)	7	(15)
Net decrease in cash and cash equivalents	(94)	(36)	(202)
Cash and cash equivalents at beginning of year	156	192	394
Cash and cash equivalents at end of year	62	156	192
Supplemental disclosures of cash flow information:
Income taxes paid	65	81	38
Interest paid	$ 195	$ 180	$ 183