GOODWILL AND OTHER INTANGIBLE ASSETS - Other Intangible Assets Subject to Amortization (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Dec. 31, 2021
Other intangible assets:
Weighted average life (in years)	9 years 2 months 12 days
Total other intangible assets, cost	$ 3,473	$ 3,443
Amortizable intangible assets, accumulated amortization	822	804
Total other intangible assets, net	2,651	2,639
Certificates of need
Other intangible assets:
Indefinite-lived intangible assets	1,771	1,771
Medicare licenses
Other intangible assets:
Indefinite-lived intangible assets	$ 522	522
Customer contracts/ relationships
Other intangible assets:
Weighted average life (in years)	9 years 4 months 24 days
Amortizable intangible assets, cost	$ 912	883
Amortizable intangible assets, accumulated amortization	634	620
Amortizable intangible assets, net	$ 278	263
Trade names and technology
Other intangible assets:
Weighted average life (in years)	7 years
Amortizable intangible assets, cost	$ 159	160
Amortizable intangible assets, accumulated amortization	100	97
Amortizable intangible assets, net	$ 59	63
Provider contracts
Other intangible assets:
Weighted average life (in years)	11 years 7 months 6 days
Amortizable intangible assets, cost	$ 72	72
Amortizable intangible assets, accumulated amortization	58	57
Amortizable intangible assets, net	$ 14	15
Noncompetes and other
Other intangible assets:
Weighted average life (in years)	6 years 9 months 18 days
Amortizable intangible assets, cost	$ 37	35
Amortizable intangible assets, accumulated amortization	30	30
Amortizable intangible assets, net	$ 7	$ 5