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Basis of Presentation and Significant Accounting Policies - Additional Information (Detail)
$ in Millions
 1 Months Ended 3 Months Ended 9 Months Ended
Nov. 30, 2017
Sep. 30, 2025
USD ($)
Hospital
SurgeryCenter
EndoscopyCenter
State
Sep. 30, 2024
USD ($)
Sep. 30, 2025
USD ($)
Hospital
SurgeryCenter
EndoscopyCenter
State
Sep. 30, 2024
USD ($)
Summary Of Significant Accounting Policies [Line Items]          
Number of owned and operated hospitals | Hospital   191   191  
Number of freestanding surgery centers | SurgeryCenter   123   123  
Number of freestanding endoscopy centers | EndoscopyCenter   29   29  
Number of facilities locations | State   20   20  
General and administrative expense   $ 139 $ 111 $ 395 $ 301
Charity care amount   4,131 4,001 11,887 12,091
Estimated costs of charity care   $ 408 $ 416 $ 1,153 $ 1,233
Inpatient Services [Member]          
Summary Of Significant Accounting Policies [Line Items]          
Performance obligations for inpatient/ outpatient services satisfied period       Our performance obligations for inpatient services are generally satisfied over periods that average approximately five days, and revenues are recognized based on charges incurred in relation to total expected charges  
Maximum [Member]          
Summary Of Significant Accounting Policies [Line Items]          
Percentage of income of federal poverty level eligible for charity care 400.00%        
Maximum [Member] | Outpatient Services [Member]          
Summary Of Significant Accounting Policies [Line Items]          
Performance obligations for inpatient/ outpatient services satisfied period       Our performance obligations for outpatient services are generally satisfied over a period of less than one day