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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Operating activities    
Net (loss) income $ 124 $ (1)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:    
Depreciation and amortization 126 113
Stock-based compensation expense 79 59
Deferred income taxes (152) 1
Changes in assets and liabilities:    
Receivables 77 260
Inventories 17 (8)
Current payables and accrued expenses (24) (156)
Deferred revenue (13) (119)
Other assets and liabilities (23) (55)
Net cash provided by operating activities 211 94
Investing activities    
Expenditures for property and equipment (34) (43)
Additions to capitalized software (6) (3)
Net cash used in investing activities (40) (46)
Financing activities    
Repurchases of common stock (75) (239)
Repayments of long-term borrowings (19) (12)
Payments of finance leases (43) (18)
Other financing activities, net 7 40
Net cash used in financing activities (130) (229)
Effect of exchange rate changes on cash, cash equivalents and restricted cash (3) (6)
Increase (decrease) in cash, cash equivalents and restricted cash 38 (187)
Cash, cash equivalents and restricted cash at beginning of period 496 716
Cash, cash equivalents and restricted cash at end of period 534 529
Supplemental cash flow disclosure:    
Assets acquired under operating lease 6 5
Assets acquired under finance lease 58 78
Total cash, cash equivalents and restricted cash $ 534 $ 529