ACCOUNTS RECEIVABLE - Allowance (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Accounts receivable and allowance for doubtful accounts
Estimated costs of caring	$ 620	$ 747	$ 764
Uninsured patients
Accounts receivable and allowance for doubtful accounts
Estimated costs of caring	537	650	617
Charity care patients
Accounts receivable and allowance for doubtful accounts
Estimated costs of caring	$ 83	$ 97	$ 147

Total expenses of a HCO before stop-loss insurance recoveries. Costs of services rendered (including costs of services rendered but not yet reported).

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 954
-SubTopic 450
-Section 30
-Paragraph 4
-URI https://asc.fasb.org/extlink&oid=126943116&loc=d3e5919-115623

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 954
-SubTopic 450
-Section 30
-Paragraph 3
-URI https://asc.fasb.org/extlink&oid=126943116&loc=d3e5910-115623

Name:	us-gaap_HealthCareOrganizationHealthCareCostsGross
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration