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Basis of Presentation and Significant Accounting Policies - Additional Information (Detail)
$ in Millions
 1 Months Ended 3 Months Ended
Oct. 31, 2017
Nov. 30, 2017
Mar. 31, 2018
USD ($)
State
Hospital
Surgery_Center
Mar. 31, 2017
USD ($)
Summary Of Significant Accounting Policies [Line Items]        
Number of owned and operated hospitals | Hospital     178  
Number of freestanding surgery centers | Surgery_Center     120  
Number of facilities locations | State     20  
General and administrative expense     $ 81 $ 82
Estimated implicit price concessions recorded as reductions to revenues and accounts receivable     $ 5,312 $ 4,880
Percentage of sum of revenues and uncompensated care     35.40% 33.40%
Charity care amount     $ 1,879 $ 1,086
Estimated costs of charity care     $ 775 $ 682
Inpatient Services [Member]        
Summary Of Significant Accounting Policies [Line Items]        
Performance obligations for inpatient/ outpatient services satisfied period     5 days  
Maximum [Member]        
Summary Of Significant Accounting Policies [Line Items]        
Percentage of income of federal poverty level eligible for charity care 200.00% 400.00%    
Maximum [Member] | Outpatient Services [Member]        
Summary Of Significant Accounting Policies [Line Items]        
Performance obligations for inpatient/ outpatient services satisfied period     1 day  
Minimum [Member]        
Summary Of Significant Accounting Policies [Line Items]        
Percentage of income of federal poverty level eligible for charity care   200.00%