Basis of Presentation and Significant Accounting Policies - Additional Information (Detail) $ in Millions	1 Months Ended	3 Months Ended
	Nov. 30, 2017	Mar. 31, 2022 USD ($) Hospital EndoscopyCenter State SurgeryCenter	Mar. 31, 2021 USD ($)
Summary Of Significant Accounting Policies [Line Items]
Number of owned and operated hospitals | Hospital		182
Number of freestanding surgery centers | SurgeryCenter		124
Number of freestanding endoscopy centers | EndoscopyCenter		21
Number of facilities locations | State		20
General and administrative expense		$ 95	$ 87
Charity care amount		3,458	2,942
Estimated costs of charity care		391	335
Revenues		$ 14,945	$ 13,977
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, and revenues are recognized based on charges incurred in relation to total expected charges
Centers for Medicare and Medicaid Services ("CMS") [Member]
Summary Of Significant Accounting Policies [Line Items]
Revenues		$ 244
Maximum [Member]
Summary Of Significant Accounting Policies [Line Items]
Percentage of income of federal poverty level eligible for charity care	400.00%
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