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Basis of Presentation and Significant Accounting Policies - Additional Information (Detail)
$ in Millions
 1 Months Ended 3 Months Ended
Nov. 30, 2017
Mar. 31, 2023
USD ($)
Hospital
SurgeryCenter
State
EndoscopyCenter
Mar. 31, 2022
USD ($)
Summary Of Significant Accounting Policies [Line Items]      
Number of owned and operated hospitals | Hospital   180  
Number of freestanding surgery centers | SurgeryCenter   126  
Number of freestanding endoscopy centers | EndoscopyCenter   22  
Number of facilities locations | State   20  
General and administrative expense   $ 74 $ 77
Charity care amount   3,595 3,458
Estimated costs of charity care   374 391
Revenues   $ 15,591 14,945
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  
Centers for Medicare and Medicaid Services ("CMS") [Member]      
Summary Of Significant Accounting Policies [Line Items]      
Revenues     $ 244
Managed Care and Insurers [Member]      
Summary Of Significant Accounting Policies [Line Items]      
Revenues   $ 145  
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