GOODWILL AND OTHER INTANGIBLE ASSETS - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Indefinite-Lived Intangible Assets [Line Items]
Amortization expense for other intangible assets	$ 67	$ 81	$ 65
Impairment of indefinite-lived intangible assets	55	$ 0	$ 0
Exit From Employer Group Commercial Medical Products Business
Indefinite-Lived Intangible Assets [Line Items]
Impairment of indefinite-lived intangible assets	$ 55