CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Unaudited) - USD ($) $ in Millions	Total	Common Stock and Additional Paid-In Capital	Retained Earnings (Accumulated Deficit)	Accumulated Other Comprehensive Income
Beginning balance at Dec. 31, 2021	$ 881	$ 808	$ 74	$ (1)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock for the acquisition of Zenefits		17
Stock based compensation expense		12
Net income	146		146
Repurchase of common stock			(350)
Awards effectively repurchased for required employee withholding taxes			(3)
Other comprehensive income (loss)	(8)			(8)
Ending balance at Mar. 31, 2022	695	837	(133)	(9)
Beginning balance at Dec. 31, 2022	775	899	(119)	(5)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock for the acquisition of Zenefits		0
Stock based compensation expense		11
Net income	131		131
Repurchase of common stock			(91)
Awards effectively repurchased for required employee withholding taxes			(4)
Other comprehensive income (loss)	3			3
Ending balance at Mar. 31, 2023	$ 825	$ 910	$ (83)	$ (2)