Basis of Presentation and Significant Accounting Policies - Schedule of Net Operating Revenues (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Health Care Organization, Receivable and Revenue Disclosures [Line Items]
Net operating revenues	$ 12,490	$ 12,211	$ 12,368
Medicare
Health Care Organization, Receivable and Revenue Disclosures [Line Items]
Net operating revenues	2,484	2,547	2,650
Medicare Managed Care
Health Care Organization, Receivable and Revenue Disclosures [Line Items]
Net operating revenues	2,103	1,968	1,861
Medicaid
Health Care Organization, Receivable and Revenue Disclosures [Line Items]
Net operating revenues	1,790	1,807	1,671
Managed Care and Other Third Party Payors
Health Care Organization, Receivable and Revenue Disclosures [Line Items]
Net operating revenues	5,978	5,806	6,076
Self-Pay
Health Care Organization, Receivable and Revenue Disclosures [Line Items]
Net operating revenues	$ 135	$ 83	$ 110