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Basis of Presentation and Significant Accounting Policies - Schedule of Net Operating Revenues (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Health Care Organization, Receivable and Revenue Disclosures [Line Items]    
Net operating revenues $ 3,108 $ 3,111
Medicare    
Health Care Organization, Receivable and Revenue Disclosures [Line Items]    
Net operating revenues 649 668
Medicare Managed Care    
Health Care Organization, Receivable and Revenue Disclosures [Line Items]    
Net operating revenues 543 513
Medicaid    
Health Care Organization, Receivable and Revenue Disclosures [Line Items]    
Net operating revenues 423 467
Managed Care and Other Third Party Payors    
Health Care Organization, Receivable and Revenue Disclosures [Line Items]    
Net operating revenues 1,469 1,420
Self-Pay    
Health Care Organization, Receivable and Revenue Disclosures [Line Items]    
Net operating revenues $ 24 $ 43