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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Operating activities    
Net (loss) income $ 125 $ (11)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:    
Depreciation and amortization 85 77
Stock-based compensation expense 52 37
Deferred income taxes (149) 0
Changes in assets and liabilities:    
Receivables 59 211
Inventories 5 (7)
Current payables and accrued expenses (32) (155)
Deferred revenue 26 (15)
Other assets and liabilities (31) (33)
Net cash provided by operating activities 140 104
Investing activities    
Expenditures for property and equipment (23) (27)
Additions to capitalized software (4) (2)
Net cash used in investing activities (27) (29)
Financing activities    
Repurchases of common stock (75) (175)
Repayments of long-term borrowings (13) (6)
Payments of finance leases (25) (9)
Other financing activities, net 6 36
Net cash used in financing activities (107) (154)
Effect of exchange rate changes on cash, cash equivalents and restricted cash (7) 0
Decrease in cash, cash equivalents and restricted cash (1) (79)
Cash, cash equivalents and restricted cash at beginning of period 496 716
Cash, cash equivalents and restricted cash at end of period 495 637
Supplemental cash flow disclosure:    
Assets acquired under operating lease 5 4
Assets acquired under finance lease 39 48
Total cash, cash equivalents and restricted cash $ 496 $ 637