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Basis of Presentation and Significant Accounting Policies - Additional Information (Details)
$ in Millions
 3 Months Ended
Jan. 01, 2023
Hospital
Mar. 31, 2024
USD ($)
Mar. 31, 2023
USD ($)
Dec. 31, 2023
USD ($)
Dec. 31, 2022
Cost of Revenue, Policy [Abstract]          
Corporate Office Costs   $ 82 $ 61    
Third Party Reimbursement [Abstract]          
Amounts due to third party payors   74   $ 97  
Amounts due from third party payors   131   $ 130  
Net Operating Revenues, Policy [Abstract]          
Charity care services charges excluded from net operating revenues   316 326    
Value of charity care services at the Company's standard charges included in contractual allowances   30 38    
Accounting for the Impairment or Disposal of Long-Lived Assets          
Number of hospitals sold | Hospital 1        
Amount related to several assets idled disposed or held for sale     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     22    
Gain Loss On Sales Of Assets And Asset Impairment Charges Gross     $ 25    
Impairment of amount related to several assets idled disposed or held for sale   $ 17