SEGMENT INFORMATION - Reconciling Items (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
Segment Reporting Information [Line Items]
Assets	$ 27,076		$ 27,076		$ 27,579
Capital expenditures:	165	$ 111	472	$ 354
Net operating revenues	4,801	4,894	14,184	14,629
Equity in earnings of unconsolidated affiliates:	51	45	151	141
Adjusted Segment EBITDA [Abstract]
Adjusted EBITDA:	841	855	2,572	2,466
Depreciation and amortization	209	209	628	654
Depreciation and amortization	(209)	(209)	(628)	(654)
Impairment and restructuring charges, and acquisition-related costs	(24)	(15)	(97)	(55)
Litigation and investigation costs	(12)	(29)	(50)	(64)
Interest expense	(222)	(227)	(671)	(702)
Loss from early extinguishment of debt	0	(20)	(109)	(74)
Other non-operating income, net	6	7	6	16
Net gains on sales, consolidation and deconsolidation of facilities	0	412	0	427
Income from continuing operations, before income taxes	380	774	1,023	1,360
Inter-segment eliminations
Segment Reporting Information [Line Items]
Net operating revenues	(116)	(116)	(342)	(362)
Hospital Operations
Segment Reporting Information [Line Items]
Assets	15,731		15,731		17,173
Capital expenditures:	143	95	405	295
Equity in earnings of unconsolidated affiliates:	2	2	8	11
Adjusted Segment EBITDA [Abstract]
Adjusted EBITDA:	432	496	1,377	1,379
Depreciation and amortization	172	177	518	555
Depreciation and amortization	(172)	(177)	(518)	(555)
Hospital Operations | Operating Segments
Segment Reporting Information [Line Items]
Net operating revenues	3,778	4,030	11,221	12,072
Ambulatory Care
Segment Reporting Information [Line Items]
Assets	10,443		10,443		9,473
Capital expenditures:	18	14	58	49
Net operating revenues	806	666	2,315	1,976
Equity in earnings of unconsolidated affiliates:	49	43	143	130
Adjusted Segment EBITDA [Abstract]
Adjusted EBITDA:	319	274	920	826
Depreciation and amortization	28	23	83	71
Depreciation and amortization	(28)	(23)	(83)	(71)
Ambulatory Care | Operating Segments
Segment Reporting Information [Line Items]
Net operating revenues	806	666	2,315	1,976
Conifer
Segment Reporting Information [Line Items]
Assets	902		902		$ 933
Capital expenditures:	4	2	9	10
Net operating revenues	333	314	990	943
Adjusted Segment EBITDA [Abstract]
Adjusted EBITDA:	90	85	275	261
Depreciation and amortization	9	9	27	28
Depreciation and amortization	(9)	(9)	(27)	(28)
Conifer | Operating Segments
Segment Reporting Information [Line Items]
Net operating revenues	333	314	990	943
Conifer | Tenet | Operating Segments
Segment Reporting Information [Line Items]
Net operating revenues	116	116	342	362
Conifer | Other clients | Operating Segments
Segment Reporting Information [Line Items]
Net operating revenues	$ 217	$ 198	$ 648	$ 581