ACQUISITIONS, GOODWILL, AND OTHER INTANGIBLE ASSETS - Narrative (Details) - USD ($)		12 Months Ended
	Feb. 17, 2023	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Business Acquisition [Line Items]
Consideration transferred, upfront payment		$ 147,000,000	$ 0	$ 1,481,000,000
Goodwill		12,936,000,000	12,813,000,000	12,892,000,000
Goodwill impairment			0	0
Impairment of intangible assets, indefinite-lived		0	0	0
Additions to acquired finite-lived intangible assets		$ 62,000,000
Acquired finite-lived intangible assets, weighted average useful life		9 years
Amortization of intangible assets		$ 362,000,000	405,000,000	400,000,000
Impairment of intangible assets, definite-lived		$ 0	$ 0	$ 0
Caption Health
Business Acquisition [Line Items]
Percent of interest acquired	100.00%
Consideration transferred, upfront payment	$ 127,000,000
Consideration transferred, holdback payment	10,000,000
Contingent consideration	13,000,000
Goodwill	94,000,000
Intangible assets	60,000,000
Deferred tax liabilities	$ 3,000,000