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, 2022 USD ($) Hospital State EndoscopyCenter SurgeryCenter	Sep. 30, 2021 USD ($)	Sep. 30, 2022 USD ($) Hospital State EndoscopyCenter SurgeryCenter	Sep. 30, 2021 USD ($)
Summary Of Significant Accounting Policies [Line Items]
Number of owned and operated hospitals | Hospital		182		182
Number of freestanding surgery centers | SurgeryCenter		125		125
Number of freestanding endoscopy centers | EndoscopyCenter		21		21
Number of facilities locations | State		20		20
General and administrative expense		$ 91	$ 87	$ 281	$ 301
Charity care amount		3,206	3,509	10,281	10,135
Estimated costs of charity care		359	413	1,151	1,155
Revenues		$ 14,971	$ 15,276	$ 44,736	$ 43,688
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