GOODWILL AND OTHER INTANGIBLE ASSETS - Other Intangible Assets Subject to Amortization (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Dec. 31, 2022
Other intangible assets:
Weighted average life (in years)	9 years 1 month 6 days
Total other intangible assets, cost	$ 2,641	$ 2,648
Amortizable intangible assets, accumulated amortization	887	883
Total other intangible assets, net	1,754	1,765
Certificates of need
Indefinite-lived Intangible Assets [Line Items]
Indefinite-lived intangible assets	1,132	1,132
Medicare licenses
Indefinite-lived Intangible Assets [Line Items]
Indefinite-lived intangible assets	$ 286	286
Customer contracts/ relationships
Other intangible assets:
Weighted average life (in years)	9 years 3 months 18 days
Amortizable intangible assets, cost	$ 932	929
Amortizable intangible assets, accumulated amortization	685	673
Amortizable intangible assets, net	$ 247	256
Trade names and technology
Other intangible assets:
Weighted average life (in years)	6 years 9 months 18 days
Amortizable intangible assets, cost	$ 134	142
Amortizable intangible assets, accumulated amortization	101	107
Amortizable intangible assets, net	$ 33	35
Provider contracts
Other intangible assets:
Weighted average life (in years)	11 years 7 months 6 days
Amortizable intangible assets, cost	$ 73	73
Amortizable intangible assets, accumulated amortization	63	63
Amortizable intangible assets, net	$ 10	10
Noncompetes and other
Other intangible assets:
Weighted average life (in years)	8 years 4 months 24 days
Amortizable intangible assets, cost	$ 84	86
Amortizable intangible assets, accumulated amortization	38	40
Amortizable intangible assets, net	$ 46	$ 46