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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Operating activities    
Net income (loss) attributable to common stockholders $ 114 $ 124
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 113 126
Stock-based compensation expense 79 79
Deferred income taxes 10 (152)
Changes in assets and liabilities:    
Receivables 41 77
Inventories 12 17
Current payables and accrued expenses 45 (24)
Deferred revenue (45) (13)
Other assets and liabilities (1) (23)
Net cash provided by operating activities 368 211
Investing activities    
Expenditures for property and equipment (19) (34)
Additions to capitalized software (2) (6)
Net cash used in investing activities (21) (40)
Financing activities    
Repurchases of common stock (176) (75)
Repayments of long-term borrowings (32) (19)
Payments of finance leases (68) (43)
Other financing activities, net 24 7
Net cash used in financing activities (252) (130)
Effect of exchange rate changes on cash, cash equivalents and restricted cash (11) (3)
Increase in cash, cash equivalents and restricted cash 84 38
Cash, cash equivalents and restricted cash at beginning of period 533 496
Cash, cash equivalents and restricted cash at end of period 617 534
Supplemental cash flow disclosure:    
Assets acquired under operating lease 9 6
Assets acquired under finance lease 62 58
Annual variable incentive payout settled in equity 17 0
Cash and cash equivalents 613  
Restricted cash 4  
Total cash, cash equivalents and restricted cash $ 617 $ 534