CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Cash flows from operating activities:
Net income (loss)	$ 421	$ 17	$ (137)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization	175	263	304
Impairment of goodwill, intangibles and other assets	0	0	62
Investment (Gain)/Loss	(10)	1	7
Amortization of debt issuance costs and discounts	15	38	23
Share-based compensation	45	35	27
Debt extinguishment costs	1	65	0
Deferred income taxes	2	(9)	(44)
Unrealized gain on forward interest rate swaps	(8)	(2)	0
Other, net	4	4	3
Changes in operating assets and liabilities:
Accounts receivable, net	(31)	161	34
Inventories, net	(43)	(110)	34
Other assets	(12)	16	7
Accounts payable	122	(49)	122
Accrued liabilities	35	13	(26)
Deferred revenue	51	17	7
Income taxes	24	26	(41)
Other operating activities	(6)	(8)	(2)
Net cash provided by operating activities	785	478	380
Cash flows from investing activities:
Acquisition of businesses, net of cash acquired	(72)	0	0
Purchases of property, plant and equipment	(64)	(50)	(77)
Proceeds from the sale of a business	0	0	39
Proceeds from the sale of long-term investments	2	0	0
Purchases of long-term investments	(3)	(1)	(1)
Net cash used in investing activities	(137)	(51)	(39)
Cash flows from financing activities:
Payments of debt issuance costs and discounts	(2)	(5)	(5)
Proceeds from issuance of long-term debt	909	1,371	102
Payments of long term-debt	(1,566)	(1,825)	(484)
Payments of debt extinguishment costs	(1)	(65)	0
Proceeds from exercise of stock options and stock purchase plan purchases	10	12	11
Taxes paid related to net share settlement of equity awards	(11)	(5)	(8)
Net cash used in financing activities	(661)	(517)	(384)
Effect of exchange rate changes on cash	(5)	(4)	7
Net decrease in cash and cash equivalents	(18)	(94)	(36)
Cash and cash equivalents at beginning of year	62	156	192
Cash and cash equivalents at end of year	44	62	156
Supplemental disclosures of cash flow information:
Income taxes paid	76	65	81
Interest paid	$ 90	$ 195	$ 180