Consolidated Statements of Cash Flows - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Operating activities
Net income (loss)	$ 147	$ 129	$ (20)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization	149	172	150
Stock-based compensation expense	112	101	83
Deferred income taxes	14	(118)	(3)
Changes in assets and liabilities:
Receivables	(5)	67	190
Inventories	3	2	(3)
Account payables and accrued expenses	17	0	(153)
Deferred revenue	42	4	(62)
Other assets and liabilities	(16)	(90)	(34)
Net cash provided by operating activities	463	267	148
Investing activities
Expenditures for property and equipment	(28)	(44)	(54)
Additions to capitalized software	(3)	(7)	(5)
Net cash used in investing activities	(31)	(51)	(59)
Financing activities
Repayments of long-term borrowings	(44)	(25)	(19)
Repurchases of common stock	(244)	(100)	(300)
Payments of finance leases	(92)	(70)	(33)
Other financing activities, net	24	9	44
Net cash used in financing activities	(356)	(186)	(308)
Effect of exchange rate changes on cash and cash equivalents	(14)	7	(1)
Increase (decrease) in cash, cash equivalents and restricted cash	62	37	(220)
Cash, cash equivalents and restricted cash at beginning of year	533	496	716
Cash, cash equivalents and restricted cash at end of year	595	533	496
Reconciliation of cash, cash equivalents and restricted cash to the Consolidated Balance Sheets
Cash and cash equivalents	592	529	494
Restricted cash	3	4	2
Total cash, cash equivalents and restricted cash	595	533	496
Supplemental cash flow disclosure:
Assets acquired by finance lease	76	85	115
Assets acquired by operating lease	9	8	6
Annual variable incentive payout settled in equity	17	0	0
Cash paid during the year for:
Income taxes	44	39	33
Interest	$ 26	$ 27	$ 26