EQUITY - Narrative (Details) - USD ($) $ in Millions	3 Months Ended				6 Months Ended
	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020	Dec. 31, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items]
Stockholders equity balance	$ 1,169	$ 1,016	$ 633	$ 503	$ 1,169	$ 633	$ 937	$ 437
Net income	177	141	123	125
Noncontrolling Interests
Accumulated Other Comprehensive Income (Loss) [Line Items]
Stockholders equity balance	908	893	890	861	908	890	909	$ 854
Net income	58	$ 44	$ 35	$ 32
Noncontrolling Interests | Hospital Operations
Accumulated Other Comprehensive Income (Loss) [Line Items]
Stockholders equity balance	129				129		116
Net income					9	5
Noncontrolling Interests | Ambulatory Care
Accumulated Other Comprehensive Income (Loss) [Line Items]
Stockholders equity balance	$ 779				779		$ 793
Net income					$ 93	$ 62