CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Millions	Total	Common Stock and Additional Paid-In Capital:	Retained Earnings (Accumulated Deficit):	Accumulated Other Comprehensive (Loss) Income:
Beginning balance at Dec. 31, 2020	$ 607	$ 747	$ (144)	$ 4
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock from exercise of stock options		1
Issuance of common stock for employee stock purchase plan		10
Repurchase of common stock			(94)
Stock based compensation expense		50
Net income	338		338
Awards effectively repurchased for required employee withholding taxes			(26)
Other comprehensive (loss) income	(5)			(5)
Ending balance at Dec. 31, 2021	881	808	74	(1)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock from exercise of stock options		1
Issuance of common stock for employee stock purchase plan		10
Issuance of common stock for the acquisition of Zenefits		17
Repurchase of common stock		1	(524)
Stock based compensation expense		62
Net income	355		355
Awards effectively repurchased for required employee withholding taxes			(24)
Other comprehensive (loss) income	(4)			(4)
Ending balance at Dec. 31, 2022	775	899	(119)	(5)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock from exercise of stock options		4
Issuance of common stock for employee stock purchase plan		11
Repurchase of common stock			(1,122)
Stock based compensation expense		62
Net income	375		375
Awards effectively repurchased for required employee withholding taxes			(30)
Other comprehensive (loss) income	3			3
Ending balance at Dec. 31, 2023	$ 78	$ 976	$ (896)	$ (2)