Real Estate and Other Activities - Disposals - 2022 Activity - Additional Information (Detail) $ in Millions			3 Months Ended		6 Months Ended
	Mar. 08, 2023 USD ($)	Mar. 14, 2022 USD ($) Facility	Mar. 31, 2023 Facility	Jun. 30, 2022 USD ($)	Jun. 30, 2022 USD ($) Property Facility
Debt Instrument [Line Items]
Gain (loss) on real estate dispositions					$ 31
Number of facilities sold | Facility					4
Number of ancillary properties sold | Property					2
Proceeds from sale of facilities					$ 154
Massachusetts-based General Acute Care Hospitals [Member]
Debt Instrument [Line Items]
Number of facilities acquired | Facility		8
Purchase price of acquisition		$ 1,700
Gain (loss) on real estate dispositions		$ 600
Straight-line rent write-offs				$ 125	$ 125
Prime [Member]
Debt Instrument [Line Items]
Number of facilities sold | Facility			3
Proceeds from sale of facilities	$ 100