GOODWILL AND OTHER INTANGIBLE ASSETS - Schedule of Other Intangible Assets Included in Other Long-Term Assets (Details) - USD ($) $ in Millions	Mar. 31, 2025	Dec. 31, 2024
Other intangible assets:
Weighted average life (in years)	9 years 2 months 12 days
Total other intangible assets, cost	$ 2,434	$ 2,436
Amortizable intangible assets, accumulated amortization	1,007	993
Total other intangible assets, net	1,427	1,443
Certificates of need
Indefinite-lived Intangible Assets [Line Items]
Indefinite-lived intangible assets	910	910
Medicare licenses
Indefinite-lived Intangible Assets [Line Items]
Indefinite-lived intangible assets	$ 270	270
Customer contracts/relationships
Other intangible assets:
Weighted average life (in years)	9 years 4 months 24 days
Amortizable intangible assets, cost	$ 963	965
Amortizable intangible assets, accumulated amortization	770	759
Amortizable intangible assets, net	$ 193	206
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	120	119
Amortizable intangible assets, net	$ 19	20
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	64	64
Amortizable intangible assets, net	$ 3	3
Noncompetes and other
Other intangible assets:
Weighted average life (in years)	8 years 4 months 24 days
Amortizable intangible assets, cost	$ 85	85
Amortizable intangible assets, accumulated amortization	53	51
Amortizable intangible assets, net	$ 32	$ 34