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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, 2025
Mar. 31, 2024
Disaggregation of Revenue [Line Items]    
Net operating revenues $ 3,159 $ 3,140
Medicare    
Disaggregation of Revenue [Line Items]    
Net operating revenues 591 596
Medicare Managed Care    
Disaggregation of Revenue [Line Items]    
Net operating revenues 603 579
Medicaid    
Disaggregation of Revenue [Line Items]    
Net operating revenues 477 441
Managed Care and Other Third Party Payors    
Disaggregation of Revenue [Line Items]    
Net operating revenues 1,468 1,480
Self-Pay    
Disaggregation of Revenue [Line Items]    
Net operating revenues $ 20 $ 44