Basis of Presentation and Significant Accounting Policies - Schedule of Net Operating Revenues (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Health Care Organization, Receivable and Revenue Disclosures [Line Items]
Net operating revenues	$ 3,025	$ 3,115	$ 9,069	$ 9,135
Medicare
Health Care Organization, Receivable and Revenue Disclosures [Line Items]
Net operating revenues	644	653	1,928	1,988
Medicaid
Health Care Organization, Receivable and Revenue Disclosures [Line Items]
Net operating revenues	449	412	1,362	1,223
Managed Care and Other Third Party Payors
Health Care Organization, Receivable and Revenue Disclosures [Line Items]
Net operating revenues	1,925	2,010	5,719	5,845
Self-Pay
Health Care Organization, Receivable and Revenue Disclosures [Line Items]
Net operating revenues	$ 7	$ 40	$ 60	$ 79