GOODWILL AND OTHER INTANGIBLE ASSETS - Other Intangible Assets Subject to Amortization (Details) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Other intangible assets:
Weighted average life (in years)	9 years 2 months 12 days
Total other intangible assets, cost	$ 2,685	$ 2,648
Amortizable intangible assets, accumulated amortization	920	883
Total other intangible assets, net	1,765	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	$ 302	286
Customer contracts/ relationships
Other intangible assets:
Weighted average life (in years)	9 years 4 months 24 days
Amortizable intangible assets, cost	$ 955	929
Amortizable intangible assets, accumulated amortization	708	673
Amortizable intangible assets, net	$ 247	256
Trade names and technology
Other intangible assets:
Weighted average life (in years)	6 years 8 months 12 days
Amortizable intangible assets, cost	$ 139	142
Amortizable intangible assets, accumulated amortization	106	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	64	63
Amortizable intangible assets, net	$ 9	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	42	40
Amortizable intangible assets, net	$ 42	$ 46