Acquisitions and Divestitures - Acquisitions - Additional Information (Details)		12 Months Ended
	Jun. 01, 2019 USD ($) Item	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Acquisitions and Divestitures [Line Items]
Goodwill		$ 4,219,000,000	$ 4,219,000,000	$ 4,328,000,000
Northwest Mississippi Medical Center [Member]
Acquisitions and Divestitures [Line Items]
Business acquisition number of licensed beds | Item	181
Business acquisition cash paid for operating assets	$ 2,000,000
Business acquisition liabilities assumed	9,000,000
Business acquisition, cost of acquired entity, purchase price	$ 11,000,000
Goodwill				0
Physician Practices Clinics and Other Ancillary Businesses
Acquisitions and Divestitures [Line Items]
Business acquisition, cost of acquired entity, purchase price		$ 3,000,000	$ 1,000,000	8,000,000
Purchase price allocation, property and equipment				4,000,000
Business acquisition, purchase price allocation, intangible assets, other than goodwill				$ 4,000,000