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Consolidated Statements of Cash Flows - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Operating activities      
Net income (loss) $ 129 $ (20) $ 30
Adjustments to reconcile net income (loss) to net cash provided by operating activities:      
Depreciation and amortization 172 150 130
Stock-based compensation expense 101 83 65
Deferred income taxes (118) (3) (18)
Changes in assets and liabilities:      
Receivables 67 190 (34)
Inventories 2 (3) 2
Account payables and accrued expenses 0 (153) 108
Deferred revenue 4 (62) 115
Other assets and liabilities (90) (34) (34)
Net cash provided by operating activities 267 148 364
Investing activities      
Expenditures for property and equipment (44) (54) (153)
Additions to capitalized software (7) (5) (7)
Other investing activities, net 0 0 (3)
Net cash used in investing activities (51) (59) (163)
Financing activities      
Repayments of long-term borrowings (25) (19) (40)
Repayments of credit-facility borrowings 0 0 (240)
Repurchases of common stock (100) (300) (300)
Payments of finance leases (70) (33) (5)
Other financing activities, net 9 44 31
Net cash used in financing activities (186) (308) (554)
Effect of exchange rate changes on cash and cash equivalents 7 (1) (20)
Increase (decrease) in cash, cash equivalents and restricted cash 37 (220) (373)
Total cash, cash equivalents and restricted cash 496 716 1,089
Cash, cash equivalents and restricted cash at end of year 533 496 716
Reconciliation of cash, cash equivalents and restricted cash to the Consolidated Balance Sheets      
Total cash, cash equivalents and restricted cash 533 716 716
Non-cash investing and financing activities:      
Assets acquired by finance lease 85 115 52
Assets acquired by operating lease 8 6 0
Cash paid during the year for:      
Income taxes 39 33 33
Interest $ 27 $ 26 $ 23