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Basis of Presentation and Significant Accounting Policies - Additional Information (Detail)
$ / shares in Units, $ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2020
USD ($)
$ / shares
Surgery_Center
Hospital
State
Jun. 30, 2019
USD ($)
$ / shares
Jun. 30, 2020
USD ($)
$ / shares
Surgery_Center
Hospital
State
Jun. 30, 2019
USD ($)
$ / shares
Summary Of Significant Accounting Policies [Line Items]        
Number of owned and operated hospitals | Hospital 186   186  
Number of freestanding surgery centers | Surgery_Center 122   122  
Number of facilities locations | State 21   21  
General and administrative expense $ 76 $ 94 $ 172 $ 180
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 3,077 3,311 $ 6,812 6,216
Estimated costs of charity care 387 $ 403 831 $ 746
Government stimulus income $ (822)   $ (822)  
Earning per share diluted | $ / shares $ 3.16 $ 2.25 $ 4.84 $ 5.22
CARES Act Provider Relief Fund [Member]        
Summary Of Significant Accounting Policies [Line Items]        
Government stimulus income $ (822)      
Earning per share diluted | $ / shares $ 1.73      
Deferred payroll taxes $ 220   $ 220  
Employee retention payroll tax credits 60   60  
Accelerated Medicare payments received 4,400   4,400  
General and targeted distributions recived     1,400  
Proceeds from general distribution fund 922      
General distribution fund value 50,000   50,000  
Proceeds from targeted distributions fund 454      
Government stimulus income net of tax 590      
Senior Secured Three Six Four Day Term Loan Facility [Member]        
Summary Of Significant Accounting Policies [Line Items]        
Maximum borrowing capacity $ 2,000   2,000  
Out of Network Services [Member]        
Summary Of Significant Accounting Policies [Line Items]        
Revenues     $ 55 $ 86
Minimum [Member]        
Summary Of Significant Accounting Policies [Line Items]        
Percentage of income of federal poverty level eligible for charity care     400.00%