ACQUISITIONS - Narrative (Details) - USD ($) $ in Millions		3 Months Ended	12 Months Ended
	Aug. 17, 2021	Mar. 31, 2020	Dec. 31, 2021	Dec. 31, 2020
Disclosures by Disposal Groups [Line Items]
Equity method investments			$ 141	$ 1,170
Purchase price allocated to goodwill			$ 6,645	$ 519
Kindred at Home
Disclosures by Disposal Groups [Line Items]
Equity method investments	$ 1,300
Kindred at Home
Disclosures by Disposal Groups [Line Items]
Remaining ownership percentage acquired	60.00%
Enterprise value of acquiree including existing equity value	$ 8,200
Existing equity value	$ 2,400
Minority ownership prior to acquisition (percent)	40.00%
Remeasurement gain	$ 1,100
Transaction amount, net of existing equity stake	5,800
Goodwill expected to be tax deductible	132
Acquisition-related costs	45
Purchase price allocated to net tangible liabilities	2,857
Kindred at Home | Trade names and technology
Disclosures by Disposal Groups [Line Items]
Purchase price allocated to other intangible assets	$ 18
Estimated weighted average useful life of acquired intangible assets (in years)	10 years
Enclara
Disclosures by Disposal Groups [Line Items]
Purchase price allocated to other intangible assets		$ 240
Estimated weighted average useful life of acquired intangible assets (in years)		11 years
Cash consideration for acquisition		$ 709
Purchase price allocated to goodwill		517
Purchase price allocated to net tangible liabilities		$ 13