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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Operating activities    
Net loss $ (10) $ (7)
Adjustments to reconcile net loss to net cash provided by operating activities:    
Depreciation and amortization 37 34
Stock-based compensation expense 15 19
Deferred income taxes 2 (5)
Changes in assets and liabilities:    
Receivables 143 83
Inventories (24) (13)
Current payables and accrued expenses (171) (27)
Deferred revenue 74 124
Other assets and liabilities (17) (24)
Net cash provided by operating activities 49 184
Investing activities    
Expenditures for property and equipment (15) (26)
Additions to capitalized software (1) (2)
Net cash used in investing activities (16) (28)
Financing activities    
Repurchases of common stock (56) (60)
Repayments of long-term borrowings 0 (15)
Repayments of credit facility borrowings 0 (240)
Payments of finance leases (3) 0
Other financing activities, net 33 10
Net cash used in financing activities (26) (305)
Effect of exchange rate changes on cash, cash equivalents and restricted cash 1 0
Increase (decrease) in cash, cash equivalents and restricted cash 8 (149)
Cash, cash equivalents and restricted cash at beginning of period 716 1,089
Cash, cash equivalents and restricted cash at end of period 724 940
Non-cash investing and financing activities:    
Assets acquired under operating lease 3 0
Assets acquired under finance lease 15 0
Total cash, cash equivalents and restricted cash $ 716 $ 1,089