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Basis of Presentation and Significant Accounting Policies - Additional Information (Details)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2025
USD ($)
Jun. 30, 2024
USD ($)
Jun. 30, 2025
USD ($)
Hospital
Jun. 30, 2024
USD ($)
Dec. 31, 2024
USD ($)
Dec. 31, 2023
Cost of Revenue, Policy [Abstract]            
Corporate Office Costs $ 69 $ 75 $ 138 $ 156    
Third Party Reimbursement [Abstract]            
Amounts due to third party payors 175   175   $ 125  
Amounts due from third party payors 128   128   $ 161  
Net Operating Revenues, Policy [Abstract]            
Charity care services charges excluded from net operating revenues 334 287 642 603    
Value of charity care services at the Company's standard charges included in contractual allowances $ 34 $ 29 $ 69 59    
Accounting for the Impairment or Disposal of Long-Lived Assets            
Number of hospitals sold | Hospital     4      
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     $ 263      
Gain (loss) on sales of assets and asset impairment charges gross     291      
Amount related to several assets idled disposed or held for sale     5 $ 27    
Adjustment for Carrying Value of Other Long-Lived Assets at Underperforming Hospitals            
Accounting for the Impairment or Disposal of Long-Lived Assets            
Impairment of long-lived assets held for sale     23      
Shared Service Center            
Accounting for the Impairment or Disposal of Long-Lived Assets            
Gain (loss) on disposition of business     $ 390