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Acquisitions and Dispositions - Additional Information (Detail) $ in Millions	6 Months Ended
	Jun. 30, 2020 USD ($) Hospital	Jun. 30, 2019 USD ($) Hospital
Business Acquisition [Line Items]
Number of hospitals purchased | Hospital	1	7
Proceeds from sale of business	$ 39	$ 41
Real Estate and Other Investments [Member]
Business Acquisition [Line Items]
Gain (loss) on sales of real estate	3	18
Proceeds from sale of business	39	16
Hospitals [Member]
Business Acquisition [Line Items]
Aggregate purchase price		1,397
Gain (loss) on sales of real estate	(23)
Hospitals [Member] | Discontinued Operations, Disposed of by Sale [Member]
Business Acquisition [Line Items]
Gain (loss) on sales of real estate		(1)
Proceeds from sale of business		25
Nonhospital Health Care [Member]
Business Acquisition [Line Items]
Aggregate purchase price		$ 107
Hospital and other nonhospital health care entities [Member]
Business Acquisition [Line Items]
Aggregate purchase price	346
Fair value of identifiable net assets	$ 306

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