Basis of Presentation and Significant Accounting Policies - Schedule of Net Operating Revenues (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Health Care Organization, Receivable and Revenue Disclosures [Line Items]
Net operating revenues	$ 3,140	$ 3,108
Medicare
Health Care Organization, Receivable and Revenue Disclosures [Line Items]
Net operating revenues	596	649
Medicare Managed Care
Health Care Organization, Receivable and Revenue Disclosures [Line Items]
Net operating revenues	579	543
Medicaid
Health Care Organization, Receivable and Revenue Disclosures [Line Items]
Net operating revenues	441	423
Managed Care and Other Third Party Payors
Health Care Organization, Receivable and Revenue Disclosures [Line Items]
Net operating revenues	1,480	1,469
Self-Pay
Health Care Organization, Receivable and Revenue Disclosures [Line Items]
Net operating revenues	$ 44	$ 24