ACQUISITIONS AND DIVESTITURES (Details) $ in Millions			3 Months Ended			7 Months Ended	12 Months Ended		24 Months Ended
	Aug. 09, 2018 USD ($)	Aug. 08, 2018 USD ($)	Mar. 31, 2020 USD ($)	Jun. 30, 2018 USD ($)	Mar. 31, 2018 USD ($)	Aug. 08, 2018 USD ($)	Dec. 31, 2020 USD ($) primary_care_center	Dec. 31, 2019 USD ($)	Dec. 31, 2022 primary_care_center
Disclosures by Disposal Groups [Line Items]
Purchase price allocated to goodwill							$ 519	$ 31
Number of payor-agnostic, senior-focused primary care centers in strategic partnership | primary_care_center							20
Disposed of by sale | KMG America Corporation
Disclosures by Disposal Groups [Line Items]
Cash contribution from parent to disposal group to fund transaction	$ 190
Statutory capital transferred with sale	160
Loss, including transaction costs, on disposal	786
Tax benefit on disposal transaction	$ 452
Cash transferred to third party prior to sale		$ 245
Disposal group revenues						$ 182
Disposal group income						$ 47
Enclara
Disclosures by Disposal Groups [Line Items]
Cash consideration for acquisition			$ 709
Purchase price allocated to goodwill			517
Purchase price allocated to other intangible assets			240
Purchase price allocated to net tangible liabilities			$ 13
Estimated weighted average useful life of acquired intangible assets (in years)			11 years
MCCI
Disclosures by Disposal Groups [Line Items]
Cash consideration for acquisition					$ 169
Purchase price allocated to goodwill					483
Purchase price allocated to other intangible assets					80
Purchase price allocated to net tangible assets					24
FPG
Disclosures by Disposal Groups [Line Items]
Cash consideration for acquisition				$ 185
Purchase price allocated to goodwill				133
Purchase price allocated to other intangible assets				38
Purchase price allocated to net tangible assets				$ 14
Estimated weighted average useful life of acquired intangible assets (in years)				5 years
WCAS
Disclosures by Disposal Groups [Line Items]
Expected time frame for opening primary care centers							2 years
Value of partnership entity			$ 600
Time frame for put and call option activity per partnership agreement, minimum			5 years
Time frame for put and call option activity per partnership agreement, maximum			10 years
WCAS | Forecast
Disclosures by Disposal Groups [Line Items]
Number of payor-agnostic, senior-focused primary care centers in strategic partnership | primary_care_center									30
MCCI
Disclosures by Disposal Groups [Line Items]
Note receivable					$ 383