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Basis of Presentation and Significant Accounting Policies - Additional Information (Detail)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2019
USD ($)
Hospital
Surgery_Center
State
Sep. 30, 2018
USD ($)
Sep. 30, 2019
USD ($)
Hospital
Surgery_Center
State
Sep. 30, 2018
USD ($)
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 $ 88 $ 90 $ 268 $ 254
Percentage of sum of revenues and uncompensated care 38.40% 37.20% 37.50% 36.20%
Charity care amount $ 3,425 $ 2,314 $ 9,641 $ 6,170
Estimated costs of charity care $ 421 $ 295 $ 1,167 $ 777
Inpatient Services [Member]        
Summary Of Significant Accounting Policies [Line Items]        
Performance obligations for inpatient/ outpatient services satisfied period     5 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     1 day