Basis of Presentation and Significant Accounting Policies - Additional Information (Detail) $ in Millions	1 Months Ended	3 Months Ended		9 Months Ended
	Nov. 30, 2017	Sep. 30, 2023 USD ($) Hospital SurgeryCenter State EndoscopyCenter	Sep. 30, 2022 USD ($)	Sep. 30, 2023 USD ($) Hospital SurgeryCenter State EndoscopyCenter	Sep. 30, 2022 USD ($)
Summary Of Significant Accounting Policies [Line Items]
Number of owned and operated hospitals | Hospital		183		183
Number of freestanding surgery centers | SurgeryCenter		126		126
Number of freestanding endoscopy centers | EndoscopyCenter		22		22
Number of facilities locations | State		20		20
General and administrative expense		$ 80	$ 74	$ 227	$ 228
Charity care amount		3,531	3,206	10,684	10,281
Estimated costs of charity care		$ 382	$ 359	$ 1,133	$ 1,151
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
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