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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Operating activities    
Net loss $ (3) $ (6)
Adjustments to reconcile net loss to net cash provided by operating activities:    
Depreciation and amortization 64 70
Stock-based compensation expense 35 35
Deferred income taxes (6) (20)
Changes in assets and liabilities:    
Receivables 185 192
Inventories 2 (8)
Current payables and accrued expenses (31) (13)
Deferred revenue 90 58
Other assets and liabilities (46) 1
Net cash provided by operating activities 290 309
Investing activities    
Expenditures for property and equipment (58) (30)
Additions to capitalized software (4) (4)
Business acquisitions and other investing activities, net 0 (18)
Net cash used in investing activities (62) (52)
Financing activities    
Repurchases of common stock (157) (151)
Repayments of long-term borrowings (40) (15)
Repayments of credit facility borrowings (240) 0
Other financing activities, net 18 12
Net cash used in financing activities (419) (154)
Effect of exchange rate changes on cash and cash equivalents (15) 8
(Decrease) increase in cash, cash equivalents and restricted cash (206) 111
Cash, cash equivalents and restricted cash at beginning of period 1,089 974
Cash, cash equivalents and restricted cash at end of period $ 883 $ 1,085