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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Operating activities    
Net income (loss) $ 168 $ (10)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:    
Depreciation and amortization 42 37
Stock-based compensation expense 21 15
Deferred income taxes (149) 2
Changes in assets and liabilities:    
Receivables (50) 143
Inventories 3 (24)
Current payables and accrued expenses (43) (171)
Deferred revenue 66 74
Other assets and liabilities (48) (17)
Net cash provided by operating activities 10 49
Investing activities    
Expenditures for property and equipment (10) (15)
Additions to capitalized software (2) (1)
Net cash used in investing activities (12) (16)
Financing activities    
Repurchases of common stock (73) (56)
Repayments of long-term borrowings (6) 0
Payments of finance leases (9) (3)
Other financing activities, net 0 33
Net cash used in financing activities (88) (26)
Effect of exchange rate changes on cash, cash equivalents and restricted cash (10) 1
(Decrease) increase in cash, cash equivalents and restricted cash (100) 8
Cash, cash equivalents and restricted cash at beginning of period 496 716
Cash, cash equivalents and restricted cash at end of period 396 724
Supplemental cash flow disclosure:    
Assets acquired under operating lease 3 3
Assets acquired under finance lease 15 15
Total cash, cash equivalents and restricted cash $ 396 $ 724