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Basis of Presentation and Significant Accounting Policies - Additional Information (Detail)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2019
USD ($)
Hospital
Surgery_Center
State
Jun. 30, 2018
USD ($)
Jun. 30, 2019
USD ($)
Hospital
Surgery_Center
State
Jun. 30, 2018
USD ($)
Summary Of Significant Accounting Policies [Line Items]        
Number of owned and operated hospitals | Hospital 184   184  
Number of freestanding surgery centers | Surgery_Center 125   125  
Number of facilities locations | State 21   21  
General and administrative expense $ 94 $ 83 $ 180 $ 164
Percentage of sum of revenues and uncompensated care 37.90% 36.00% 37.00% 35.70%
Charity care amount $ 3,311 $ 1,977 $ 6,216 $ 3,856
Estimated costs of charity care $ 403 $ 249 $ 746 $ 482
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  
Out of Network Services [Member]        
Summary Of Significant Accounting Policies [Line Items]        
Revenues     $ 86  
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