Basis of Presentation and Significant Accounting Policies - Schedule of Net Operating Revenues (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Health Care Organization, Receivable and Revenue Disclosures [Line Items]
Net operating revenues	$ 12,368	$ 11,789	$ 13,210
Medicare
Health Care Organization, Receivable and Revenue Disclosures [Line Items]
Net operating revenues	2,650	2,813	3,331
Medicaid
Health Care Organization, Receivable and Revenue Disclosures [Line Items]
Net operating revenues	1,671	1,578	1,736
Managed Care and Other Third Party Payors
Health Care Organization, Receivable and Revenue Disclosures [Line Items]
Net operating revenues	7,937	7,400	8,014
Self-Pay
Health Care Organization, Receivable and Revenue Disclosures [Line Items]
Net operating revenues	$ 110	$ (2)	$ 129