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Basis of Presentation and Significant Accounting Policies - Additional Information (Details)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
USD ($)
Sep. 30, 2024
USD ($)
Sep. 30, 2025
USD ($)
Hospital
Sep. 30, 2024
USD ($)
Hospital
Dec. 31, 2024
USD ($)
Dec. 31, 2023
Cost of Revenue, Policy [Abstract]            
Corporate Office Costs $ 80 $ 72 $ 217 $ 228    
Third Party Reimbursement [Abstract]            
Amounts due to third party payors 129   129   $ 125  
Amounts due from third party payors 118   118   $ 161  
Net Operating Revenues, Policy [Abstract]            
Charity care services charges excluded from net operating revenues 419 304 1,061 906    
Value of charity care services at the Company's standard charges included in contractual allowances $ 42 $ 31 $ 110 $ 89    
Accounting for the Impairment or Disposal of Long-Lived Assets            
Number of hospitals sold | Hospital     4 1    
Net expense       $ 294    
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     $ 242 4    
Gain (loss) on sales of assets and asset impairment charges gross     288      
Amount related to several assets idled disposed or held for sale     15 39    
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       $ 259    
Impairment of long-lived assets held for sale     31      
Shared Service Center            
Accounting for the Impairment or Disposal of Long-Lived Assets            
Gain (loss) on disposition of business     $ 390