GOODWILL AND OTHER INTANGIBLE ASSETS - Other Intangible Assets Subject to Amortization (Details) - USD ($) $ in Millions	Sep. 30, 2024	Dec. 31, 2023
Other intangible assets:
Weighted average life (in years)	9 years 2 months 12 days
Total other intangible assets, cost	$ 2,627	$ 2,626
Amortizable intangible assets, accumulated amortization	977	933
Total other intangible assets, net	1,650	1,693
Certificates of need
Indefinite-lived Intangible Assets [Line Items]
Indefinite-lived intangible assets	1,092	1,092
Medicare licenses
Indefinite-lived Intangible Assets [Line Items]
Indefinite-lived intangible assets	$ 288	288
Customer contracts/ relationships
Other intangible assets:
Weighted average life (in years)	9 years 4 months 24 days
Amortizable intangible assets, cost	$ 956	956
Amortizable intangible assets, accumulated amortization	749	718
Amortizable intangible assets, net	$ 207	238
Trade names and technology
Other intangible assets:
Weighted average life (in years)	6 years 8 months 12 days
Amortizable intangible assets, cost	$ 139	139
Amortizable intangible assets, accumulated amortization	116	109
Amortizable intangible assets, net	$ 23	30
Provider contracts
Other intangible assets:
Weighted average life (in years)	11 years 10 months 24 days
Amortizable intangible assets, cost	$ 67	67
Amortizable intangible assets, accumulated amortization	63	62
Amortizable intangible assets, net	$ 4	5
Noncompetes and other
Other intangible assets:
Weighted average life (in years)	8 years 4 months 24 days
Amortizable intangible assets, cost	$ 85	84
Amortizable intangible assets, accumulated amortization	49	44
Amortizable intangible assets, net	$ 36	$ 40