Basis of Presentation and Significant Accounting Policies - Schedule of Net Operating Revenues (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Health Care Organization, Receivable and Revenue Disclosures [Line Items]
Net operating revenues	$ 3,111	$ 3,013
Medicare
Health Care Organization, Receivable and Revenue Disclosures [Line Items]
Net operating revenues	668	693
Medicaid
Health Care Organization, Receivable and Revenue Disclosures [Line Items]
Net operating revenues	467	391
Managed Care and Other Third Party Payors
Health Care Organization, Receivable and Revenue Disclosures [Line Items]
Net operating revenues	1,933	1,915
Self-Pay
Health Care Organization, Receivable and Revenue Disclosures [Line Items]
Net operating revenues	$ 43	$ 14