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Value of input used to measure direct or indirect retained investment in derecognized group of assets constituting transfer of business or nonprofit activity, excluding conveyance of oil and gas mineral right and transfer of product or service in contract with customer.

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Master Transactions and Cooperation Agreement with Brookdale (Details)		1 Months Ended			12 Months Ended
	Jan. 31, 2020 USD ($) property	May 31, 2021 USD ($) property	Dec. 31, 2020 USD ($) property	Oct. 31, 2019 USD ($) property	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Jan. 31, 2021 property
Real Estate Properties [Line Items]
Capital investment			$ 5,000,000				$ 5,000,000
Gain upon change of control, net					$ 311,438,000	$ 1,042,000	159,973,000
Long-term debt					6,497,613,000
Gain (loss) on sales of real estate, net					$ 9,078,000	$ 190,590,000	$ 90,350,000
Discount rate \| Minimum
Real Estate Properties [Line Items]
Real estate capitalization rate	0.10
Discount rate \| Maximum
Real Estate Properties [Line Items]
Real estate capitalization rate	0.12
Measurement Input Annual Rent Escalators \| Minimum
Real Estate Properties [Line Items]
Real estate capitalization rate	0.02
Measurement Input Annual Rent Escalators \| Maximum
Real Estate Properties [Line Items]
Real estate capitalization rate	0.03
Cap rate \| Minimum
Real Estate Properties [Line Items]
Real estate capitalization rate	0.07
Cap rate \| Maximum
Real Estate Properties [Line Items]
Real estate capitalization rate	0.09
Brookedale MTCA
Real Estate Properties [Line Items]
Number of properties disposed \| property	18
Cash proceeds	$ 385,000,000
Gain (loss) on sales of real estate, net	$ 164,000,000
Brookedale MTCA \| CCRC JV Investment
Real Estate Properties [Line Items]
Property count \| property	15
Number of properties acquired \| property	13
Equity method investments	$ 323,000,000
Real estate and intangible assets	1,800,000,000
Refundable entrance fee liabilities	308,000,000
Non refundable entrance fee liabilities	436,000,000
Long-term debt	215,000,000
Working capital	48,000,000
Payments to acquire equity method investments	396,000,000
Brookedale MTCA \| CCRC JV Investment \| Government grant income recorded in other income (expense), net
Real Estate Properties [Line Items]
Gain upon change of control, net	$ 170,000,000
Brookedale MTCA \| 2019 Amended Master Lease
Real Estate Properties [Line Items]
Number of properties to be restructured \| property	24							24
Number of leases to be terminated (in properties) \| property	1		1
Annual rent escalator	2.40%
Percent of sales proceeds	6.50%
Number of properties to be reallocated \| property	14
Amount of future rent to be paid	$ 20,000,000
Capital investment				$ 35,000,000
Capital investment term				5 years
Annual percentage increase				7.00%
CCRC JV Investment
Real Estate Properties [Line Items]
Investment ownership percentage	49.00%	49.00%
Proceeds from sale of buildings		$ 19,000,000
CCRC JV Investment \| Brookedale MTCA
Real Estate Properties [Line Items]
Interest acquired	51.00%
Purchase cost	$ 1,060,000,000.00
Non-cash lease and management fee termination loss (income), net	$ 100,000,000
Number of assets sold \| property		2
Proceeds from sale of buildings		$ 38,000,000
Other Non-Reporting Segment \| CCRC JV Investment
Real Estate Properties [Line Items]
Property count \| property				15
Senior Housing Triple Net
Real Estate Properties [Line Items]
Property count \| property				43