Goodwill and Intangible Assets, Net - Summary of Changes in Net Carrying Amount of Goodwill (Details) $ in Millions	12 Months Ended
	Dec. 31, 2023 USD ($)
Goodwill [Line Items]
Balance as of December 31, 2021	$ 3,679
Acquisitions	10	[1]
Impairment	(148)	[2]
Foreign currency translation	2
Balance as of December 31, 2022	3,543
Employer Solutions
Goodwill [Line Items]
Balance as of December 31, 2021	3,606
Acquisitions	10	[1]
Impairment	(148)	[2]
Foreign currency translation	2
Balance as of December 31, 2022	3,470
Professional Services
Goodwill [Line Items]
Balance as of December 31, 2021	73
Balance as of December 31, 2022	$ 73

[1] Amounts relate to measurement period adjustments from prior acquisitions.

[2] Amounts relate to a non-cash goodwill impairment charge related to the Company's Cloud Services reporting unit.