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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Operating activities    
Net income $ 97 $ 125
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 76 85
Stock-based compensation expense 52 52
Deferred income taxes 9 (149)
Changes in assets and liabilities:    
Receivables 32 59
Inventories 9 5
Current payables and accrued expenses 15 (32)
Deferred revenue 48 26
Other assets and liabilities (3) (31)
Net cash provided by operating activities 335 140
Investing activities    
Expenditures for property and equipment (9) (23)
Additions to capitalized software (2) (4)
Net cash used in investing activities (11) (27)
Financing activities    
Repurchases of common stock (121) (75)
Repayments of long-term borrowings (19) (13)
Payments of finance leases (44) (25)
Other financing activities, net 18 6
Net cash used in financing activities (166) (107)
Effect of exchange rate changes on cash, cash equivalents and restricted cash (4) (7)
Increase (decrease) in cash, cash equivalents and restricted cash 154 (1)
Cash, cash equivalents and restricted cash at beginning of period 533 496
Cash, cash equivalents and restricted cash at end of period 687 495
Supplemental cash flow disclosure:    
Assets acquired under operating lease 3 5
Assets acquired under finance lease 58 39
Annual variable incentive payout settled in equity 17 0
Cash and cash equivalents 684  
Restricted cash 3  
Total cash, cash equivalents and restricted cash $ 687 $ 495