Consolidated Statements of Cash Flows - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Operating activities
Net income (loss)	$ 235	$ 274	$ (174)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Loss from discontinued operations	5	13	24
Depreciation and amortization	354	344	308
Stock-based compensation expense	77	61	42
Deferred income taxes	173	10	24
Gain on sale of property, plant and equipment and other assets	(3)	0	(2)
Loss on divestiture	0	2	0
Impairment of long-lived and other assets	1	2	63
Changes in assets and liabilities:
Receivables	29	(89)	28
Inventories	(68)	(86)	(46)
Current payables and accrued expenses	(78)	216	8
Deferred service revenue and customer deposits	10	88	19
Employee benefit plans	(4)	33	384
Other assets and liabilities	24	26	3
Net cash provided by operating activities	755	894	681
Investing activities
Expenditures for property, plant and equipment	(128)	(73)	(79)
Proceeds from Sale of property, plant, and equipment	6	0	19
Additions to capitalized software	(166)	(154)	(150)
Business acquisitions, net	(8)	0	0
Proceeds from divestiture	3	47	0
Other investing activities, net	3	(9)	1
Net cash used in investing activities	(290)	(189)	(209)
Financing activities
Short term borrowings, net	(4)	(8)	8
Payments on term credit facilities	(61)	(97)	(383)
Payments on revolving credit facilities	(1,940)	(1,431)	(1,694)
Borrowings on revolving credit facilities	1,940	1,331	1,698
Debt issuance costs	0	(9)	0
Series A convertible preferred stock issuance, net of issuance costs of $26 million	0	0	794
Payments for tender offer share repurchase	0	0	(1,005)
Repurchase of company common stock	(350)	(250)	0
Tax withholding payments on behalf of employees	(31)	(16)	(16)
Proceeds from employee stock plans	15	15	15
Other financing activities	(3)	(2)	0
Net cash used in financing activities	(434)	(467)	(583)
Cash flows from discontinued operations
Net cash used in discontinued operations operating activities	(8)	(39)	(43)
Effect of exchange rate changes on cash and cash equivalents	16	(29)	(29)
Increase (decrease) in cash and cash equivalents	39	170	(183)
Cash and cash equivalents at beginning of period	498	328	511
Cash and cash equivalents at end of period	537	498	328
Income Taxes Paid, Net	98	66	60
Interest Paid, Net	$ 159	$ 155	$ 163