ACQUISITIONS - Intangible Assets Acquired (Details) - USD ($) $ in Millions			12 Months Ended
	Sep. 01, 2022	Feb. 15, 2022	Dec. 31, 2023
Customer relationships
Acquired Finite-Lived Intangible Assets [Line Items]
Estimated Useful Life			6 years
Zenefits
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible assets acquired		$ 96
Zenefits | Acquired technology
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible assets acquired		$ 56
Estimated Useful Life		6 years
Zenefits | Customer relationships
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible assets acquired		$ 40
Estimated Useful Life		7 years
Zenefits | Customer relationships | Minimum
Acquired Finite-Lived Intangible Assets [Line Items]
Estimated Useful Life	3 years
Zenefits | Customer relationships | Maximum
Acquired Finite-Lived Intangible Assets [Line Items]
Estimated Useful Life	5 years
Clarus
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible assets acquired	$ 14
Clarus | Acquired technology
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible assets acquired	$ 9
Estimated Useful Life	6 years
Clarus | Customer relationships
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible assets acquired	$ 5