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Basis of Presentation and Significant Accounting Policies - Additional Information (Details)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2024
USD ($)
Sep. 30, 2023
USD ($)
Sep. 30, 2024
USD ($)
Sep. 30, 2023
USD ($)
Hospital
Dec. 31, 2023
USD ($)
Dec. 31, 2022
Cost of Revenue, Policy [Abstract]            
Corporate Office Costs $ 72 $ 61 $ 228 $ 187    
Third Party Reimbursement [Abstract]            
Amounts due to third party payors 138   138   $ 97  
Amounts due from third party payors 146   146   $ 130  
Net Operating Revenues, Policy [Abstract]            
Charity care services charges excluded from net operating revenues 304 355 906 1,000    
Value of charity care services at the Company's standard charges included in contractual allowances $ 31 $ 39 89 $ 111    
Accounting for the Impairment or Disposal of Long-Lived Assets            
Net expense     294      
Number of hospitals sold | Hospital       3    
Change in Accounting Principle, Accounting Standards Update, Adopted [true false]           true
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     4 $ 9    
Amount related to several assets idled disposed or held for sale     39 8    
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 25    
Impairment of long-lived assets held for sale       21    
Shared Service Center            
Accounting for the Impairment or Disposal of Long-Lived Assets            
Gain (loss) on disposition of business     $ 127 $ 84