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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Operating activities    
Net loss $ (7) $ (2)
Adjustments to reconcile net loss to net cash provided by operating activities:    
Depreciation and amortization 34 36
Stock-based compensation expense 19 16
Deferred income taxes (5) (8)
Changes in assets and liabilities:    
Receivables 83 106
Inventories (13) (6)
Current payables and accrued expenses (27) (44)
Deferred revenue 124 145
Other assets and liabilities (24) 5
Net cash provided by operating activities 184 248
Investing activities    
Expenditures for property and equipment (26) (16)
Additions to capitalized software (2) (2)
Net cash used in investing activities (28) (18)
Financing activities    
Repurchases of common stock (60) (43)
Repayments of long-term borrowings (15) (8)
Repayments of credit facility borrowings (240) 0
Other financing activities, net 10 7
Net cash used in financing activities (305) (44)
Effect of exchange rate changes on cash and cash equivalents 0 4
Increase in cash, cash equivalents and restricted cash (149) 190
Cash, cash equivalents and restricted cash at beginning of period 1,089 974
Cash, cash equivalents and restricted cash at end of period $ 940 $ 1,164