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Basis of Presentation and Significant Accounting Policies - Additional Information (Details)
 12 Months Ended
Dec. 31, 2024
USD ($)
Hospital
Item
Dec. 31, 2023
USD ($)
Hospital
Dec. 31, 2022
USD ($)
Business Description [Abstract]      
Number of affiliated hospitals owned and leased by subsidiaries | Hospital 76    
Number of beds | Item 11,000    
Number of sites of care operates | Item 1,000    
Cost of Revenue, Policy [Abstract]      
Corporate Office Costs $ 304,000,000 $ 248,000,000 $ 229,000,000
Stock-based compensation expense 17,000,000 22,000,000 20,000,000
Marketable Securities, Policy [Abstract]      
Net change in fair value of available-for-sale debt securities, net of tax 0 6,000,000 (17,000,000)
Property and Equipment, Policy [Abstract]      
Construction in Progress, Gross 88,000,000 343,000,000  
Interest Costs Capitalized 17,000,000 13,000,000 9,000,000
Purchases of property and equipment and internal-use software accrued in accounts payable 129,000,000 101,000,000  
Goodwill, Policy [Abstract]      
Impairment of goodwill 0 0 0
Third Party Reimbursement [Abstract]      
Amounts due to third party payors 125,000,000 97,000,000  
Amounts due from third party payors 161,000,000 130,000,000  
Net Operating Revenues, Policy [Abstract]      
Charity care services charges excluded from net operating revenues 1,200,000,000 1,300,000,000 1,400,000,000
Value of charity care services at the Company's standard charges included in contractual allowances 117,000,000 140,000,000 166,000,000
Concentration of Credit Risk, Policy [Abstract]      
Accounts receivable, net of contractual allowances 2,286,000,000 $ 2,231,000,000  
Accounting for the Impairment or Disposal of Long-Lived Assets      
Net expense $ 301,000,000    
Number of hospitals sold | Hospital 1 5  
Supplier Finance Program [Abstract]      
Supplier finance program obligation $ 3,000,000 $ 3,000,000 $ 9,000,000
Supplier Finance Program, Obligation, Current, Statement of Financial Position [Extensible Enumeration] Accounts Payable, Current Accounts Payable, Current Accounts Payable, Current
C A R E S Act And P P P H C E Act Funds [Abstract]      
Pandemic Relief Funds     $ 173,000,000
New Accounting Pronouncements, Policy [Abstract]      
Change in Accounting Principle, Accounting Standards Update, Immaterial Effect [true false]   true  
Public Health and Social Services Emergency Fund (the "PHSSEF") | CARES Act | Paycheck Protection Program, Health Care Enhancement Act And the American Rescue Plan Act of 2021      
C A R E S Act And P P P H C E Act Funds [Abstract]      
Accelerated Payments Received Returned Under Cares Act     161,000,000
Public Health and Social Services Emergency Fund (the "PHSSEF") | CARES Act | Paycheck Protection Program And Health Care Enhancement Act | Operating Costs and Expenses      
C A R E S Act And P P P H C E Act Funds [Abstract]      
Accelerated Payments Received Returned Under Cares Act     $ 173,000,000
Hospitals Sold or Deemed Held For Sale      
Accounting for the Impairment or Disposal of Long-Lived Assets      
Gain (loss) on disposition of business $ 4,000,000 $ 87,000,000  
Amount related to several assets idled disposed or held for sale 263,000,000 9,000,000  
Gain (loss) on sales of assets and asset impairment charges gross   145,000,000  
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 8,000,000 49,000,000  
Amount related to several assets idled disposed or held for sale 34,000,000    
Shared Service Center      
Accounting for the Impairment or Disposal of Long-Lived Assets      
Gain (loss) on disposition of business 111,000,000 186,000,000  
Medicare      
Concentration of Credit Risk, Policy [Abstract]      
Accounts receivable, net of contractual allowances $ 175,000,000 $ 194,000,000  
Accounts receivable net of contractual allowances, percent 5.00% 6.00%  
Physician Recruitment Contracts      
Other Assets, Policy [Abstract]      
Term of Physician Recruitment Contract 3 years    
Physician Income Guarantees, Policy [Abstract]      
Physicians recruitment agreement period 1 year    
Term of Physician Recruitment Contract 3 years    
Unamortized portion of physician income guarantees $ 8,000,000 $ 9,000,000  
Capitalized Internal Use Software, Significant System Conversions      
Other Assets, Policy [Abstract]      
Finite-Lived Intangible Assets, Weighted-Average Useful Life 3 years    
Capitalized Internal Use Software Except Significant System Conversions      
Other Assets, Policy [Abstract]      
Finite-Lived Intangible Assets, Weighted-Average Useful Life 3 years    
Minimum      
Supplier Finance Program [Abstract]      
Supplier finance program obligation $ 25,000,000    
Supplier Finance Program, Obligation, Current, Statement of Financial Position [Extensible Enumeration]     Accounts Payable, Current
Maximum      
Supplier Finance Program [Abstract]      
Supplier finance program obligation $ 35,000,000    
Supplier Finance Program, Obligation, Current, Statement of Financial Position [Extensible Enumeration]     Accounts Payable, Current
Land Improvements | Minimum      
Property and Equipment, Policy [Abstract]      
Property, Plant and Equipment, Useful Life 3 years    
Land Improvements | Maximum      
Property and Equipment, Policy [Abstract]      
Property, Plant and Equipment, Useful Life 20 years    
Building and Building Improvements | Minimum      
Property and Equipment, Policy [Abstract]      
Property, Plant and Equipment, Useful Life 5 years    
Building and Building Improvements | Maximum      
Property and Equipment, Policy [Abstract]      
Property, Plant and Equipment, Useful Life 40 years    
Equipment and Fixtures | Minimum      
Property and Equipment, Policy [Abstract]      
Property, Plant and Equipment, Useful Life 3 years    
Equipment and Fixtures | Maximum      
Property and Equipment, Policy [Abstract]      
Property, Plant and Equipment, Useful Life 18 years    
Certain Facility      
Property and Equipment, Policy [Abstract]      
Non-cash investing activity through capital leases $ 3,000,000    
Geographic Concentration Risk | Indiana | Sales Revenue, Net      
Business Description [Abstract]      
Concentration Risk, Percentage 16.70% 17.10% 17.30%
Geographic Concentration Risk | Florida | Sales Revenue, Net      
Business Description [Abstract]      
Concentration Risk, Percentage 9.60% 11.10% 11.60%
Geographic Concentration Risk | Texas | Sales Revenue, Net      
Business Description [Abstract]      
Concentration Risk, Percentage 12.50% 11.70% 11.70%
Geographic Concentration Risk | Alabama | Sales Revenue, Net      
Business Description [Abstract]      
Concentration Risk, Percentage 15.40% 14.40% 13.30%