Basis of Presentation and Significant Accounting Policies - Schedule of Net Operating Revenues (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Health Care Organization, Receivable and Revenue Disclosures [Line Items]
Net operating revenues	$ 3,115	$ 2,934	$ 6,223	$ 6,044
Medicare
Health Care Organization, Receivable and Revenue Disclosures [Line Items]
Net operating revenues	628	616	1,276	1,285
Medicare Managed Care
Health Care Organization, Receivable and Revenue Disclosures [Line Items]
Net operating revenues	522	479	1,065	992
Medicaid
Health Care Organization, Receivable and Revenue Disclosures [Line Items]
Net operating revenues	449	445	872	912
Managed Care and Other Third Party Payors
Health Care Organization, Receivable and Revenue Disclosures [Line Items]
Net operating revenues	1,492	1,383	2,962	2,802
Self-Pay
Health Care Organization, Receivable and Revenue Disclosures [Line Items]
Net operating revenues	$ 24	$ 11	$ 48	$ 53