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Basis of Presentation and Significant Accounting Policies - Additional Information (Detail)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2021
USD ($)
Endoscopy_Center
Surgery_Center
State
Hospital
Jun. 30, 2020
USD ($)
Jun. 30, 2021
USD ($)
Endoscopy_Center
Surgery_Center
State
Hospital
Jun. 30, 2020
USD ($)
Summary Of Significant Accounting Policies [Line Items]        
Number of owned and operated hospitals | Hospital 187   187  
Number of freestanding surgery centers | Surgery_Center 122   122  
Number of freestanding endoscopy centers | Endoscopy_Center 21   21  
Number of facilities locations | State 20   20  
General and administrative expense $ 127 $ 76 $ 214 $ 172
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.  
Charity care amount 3,684 3,077 $ 6,626 6,812
Estimated costs of charity care $ 407 $ 387 742 831
Out of Network Services [Member]        
Summary Of Significant Accounting Policies [Line Items]        
Revenues     $ 33 $ 55
Minimum [Member]        
Summary Of Significant Accounting Policies [Line Items]        
Percentage of income of federal poverty level eligible for charity care     400.00%