CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Unaudited) - USD ($) $ in Millions	Total	Common Stock and Additional Paid-In Capital	Accumulated Deficit	Accumulated Other Comprehensive Income
Beginning balance at Dec. 31, 2019	$ 475	$ 694	$ (219)	$ 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation expense		9
Net income	91		91
Repurchase of common stock			(40)
Awards effectively repurchased for required employee withholding taxes			(4)
Other comprehensive (loss) income	2			2
Ending balance at Mar. 31, 2020	533	703	(172)	2
Beginning balance at Dec. 31, 2020	607	747	(144)	4
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation expense		11
Net income	101		101
Repurchase of common stock	(60)		(60)
Awards effectively repurchased for required employee withholding taxes			(5)
Other comprehensive (loss) income	(1)			(1)
Ending balance at Mar. 31, 2021	$ 653	$ 758	$ (108)	$ 3