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Basis of Presentation and Significant Accounting Policies - Additional Information (Details)
$ in Millions
 3 Months Ended
Mar. 31, 2025
USD ($)
Hospital
Mar. 31, 2024
USD ($)
Dec. 31, 2024
USD ($)
Dec. 31, 2023
Cost of Revenue, Policy [Abstract]        
Corporate Office Costs $ 69 $ 82    
Third Party Reimbursement [Abstract]        
Amounts due to third party payors 165   $ 125  
Amounts due from third party payors 147   $ 161  
Net Operating Revenues, Policy [Abstract]        
Charity care services charges excluded from net operating revenues 308 316    
Value of charity care services at the Company's standard charges included in contractual allowances $ 34 30    
Accounting for the Impairment or Disposal of Long-Lived Assets        
Number of hospitals sold | Hospital 2      
Change in Accounting Principle, Accounting Standards Update, Immaterial Effect [true false]       true
Hospitals Sold or Deemed Held For Sale        
Accounting for the Impairment or Disposal of Long-Lived Assets        
Gain (loss) on disposition of business $ 24      
Gain (loss) on sales of assets and asset impairment charges gross 50      
Amount related to several assets idled disposed or held for sale 5 $ 17    
Adjustment for Carrying Value of Other Long-Lived Assets at Underperforming Hospitals        
Accounting for the Impairment or Disposal of Long-Lived Assets        
Amount related to several assets idled disposed or held for sale 10      
Impairment of long-lived assets held for sale 11      
Shared Service Center        
Accounting for the Impairment or Disposal of Long-Lived Assets        
Gain (loss) on disposition of business $ 101