ACCOUNTS RECEIVABLE - Allowance (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Accounts receivable and allowance for doubtful accounts
Estimated costs of caring	$ 609	$ 620	$ 747
Uninsured patients
Accounts receivable and allowance for doubtful accounts
Estimated costs of caring	499	537	650
Charity care patients
Accounts receivable and allowance for doubtful accounts
Estimated costs of caring	$ 110	$ 83	$ 97

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
-Name Accounting Standards Codification
-Topic 954
-SubTopic 450
-Section 30
-Paragraph 4
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480654/954-450-30-4

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 954
-SubTopic 450
-Section 30
-Paragraph 3
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480654/954-450-30-3

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