Basis of Presentation and Significant Accounting Policies - Schedule of Net Operating Revenues (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Health Care Organization, Receivable and Revenue Disclosures [Line Items]
Net operating revenues	$ 2,934	$ 3,007	$ 6,044	$ 6,020
Medicare
Health Care Organization, Receivable and Revenue Disclosures [Line Items]
Net operating revenues	616	642	1,285	1,335
Medicaid
Health Care Organization, Receivable and Revenue Disclosures [Line Items]
Net operating revenues	445	420	912	811
Managed Care and Other Third Party Payors
Health Care Organization, Receivable and Revenue Disclosures [Line Items]
Net operating revenues	1,862	1,919	3,794	3,835
Self-Pay
Health Care Organization, Receivable and Revenue Disclosures [Line Items]
Net operating revenues	$ 11	$ 26	$ 53	$ 39