NET OPERATING REVENUES - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Disaggregation of Revenue [Line Items]
Reimbursement program assessments	$ 126	$ 123
Net operating revenues	20,548	19,174	$ 19,485
Revision of Prior Period, Adjustment
Disaggregation of Revenue [Line Items]
Net operating revenues	$ 24	$ 10	$ 26