GOODWILL AND OTHER INTANGIBLE ASSETS - Schedule of Other Intangible Assets Included in Other Long-Term Assets (Details) - USD ($) $ in Millions	Mar. 31, 2026	Dec. 31, 2025
Other intangible assets:
Weighted Average Life (in years)	8 years 4 months 24 days
Total other intangible assets, Gross Carrying Amount	$ 2,110	$ 2,040
Amortizable intangible assets, Accumulated Amortization	922	912
Total other intangible assets, Net	1,188	1,128
Certificates of need
Indefinite-lived Intangible Assets [Line Items]
Indefinite-lived intangible assets	790	790
Medicare licenses
Indefinite-lived Intangible Assets [Line Items]
Indefinite-lived intangible assets	$ 262	262
Customer contracts/relationships
Other intangible assets:
Weighted Average Life (in years)	8 years 6 months
Amortizable intangible assets, Gross Carrying Amount	$ 788	732
Amortizable intangible assets, Accumulated Amortization	698	692
Amortizable intangible assets, Net	$ 90	40
Trade names and technology
Other intangible assets:
Weighted Average Life (in years)	5 years 7 months 6 days
Amortizable intangible assets, Gross Carrying Amount	$ 115	104
Amortizable intangible assets, Accumulated Amortization	100	97
Amortizable intangible assets, Net	$ 15	7
Provider contracts
Other intangible assets:
Weighted Average Life (in years)	11 years 10 months 24 days
Amortizable intangible assets, Gross Carrying Amount	$ 66	67
Amortizable intangible assets, Accumulated Amortization	64	65
Amortizable intangible assets, Net	$ 2	2
Noncompetes and other
Other intangible assets:
Weighted Average Life (in years)	8 years 2 months 12 days
Amortizable intangible assets, Gross Carrying Amount	$ 89	85
Amortizable intangible assets, Accumulated Amortization	60	58
Amortizable intangible assets, Net	$ 29	$ 27