Basis of Presentation and Significant Accounting Policies - Additional Information (Detail) $ in Millions	3 Months Ended
	Mar. 31, 2020 USD ($) State Hospital Surgery_Center	Mar. 31, 2019 USD ($)
Summary Of Significant Accounting Policies [Line Items]
Number of owned and operated hospitals | Hospital	186
Number of freestanding surgery centers | Surgery_Center	123
Number of facilities locations | State	21
General and administrative expense	$ 96	$ 86
Charity care amount	3,735	2,905
Estimated costs of charity care	444	343
Senior Secured Three Six Four Day Term Loan Facility [Member]
Summary Of Significant Accounting Policies [Line Items]
Maximum borrowing capacity	$ 2,000
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	$ 55
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
Minimum [Member]
Summary Of Significant Accounting Policies [Line Items]
Percentage of income of federal poverty level eligible for charity care	400.00%