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Basis of Presentation and Significant Accounting Policies - Additional Information (Detail)
$ in Millions
 3 Months Ended
Mar. 31, 2019
USD ($)
Hospital
Surgery_Center
State
Mar. 31, 2018
USD ($)
Summary Of Significant Accounting Policies [Line Items]    
Number of owned and operated hospitals | Hospital 185  
Number of freestanding surgery centers | Surgery_Center 124  
Number of facilities locations | State 21  
General and administrative expense $ 86 $ 81
Percentage of sum of revenues and uncompensated care 36.10% 35.40%
Charity care amount $ 2,905 $ 1,879
Estimated costs of charity care $ 343 $ 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  
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