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Area of land held.

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Face (par) amount of debt instrument at time of issuance.

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The cash outflow from the acquisition of real estate intended to generate income for the owner; excludes land acquired for use by the owner.

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The cash outflow from the acquisition of a piece of land, anything permanently fixed to it, including buildings, structures on it and so forth; includes real estate intended to generate income for the owner; excludes real estate acquired for use by the owner.

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Real Estate Transactions - Real Estate Investments (Details) $ in Millions	1 Months Ended		3 Months Ended	12 Months Ended
	Mar. 31, 2022 USD ($) property	Jan. 31, 2022 USD ($)	Mar. 31, 2021 property	Dec. 31, 2021 USD ($) a property	Apr. 30, 2021 USD ($)
MASSACHUSETTS
Real Estate [Line Items]
Payments to acquire real estate				$ 498
Number of properties acquired \| property				8
CALIFORNIA
Real Estate [Line Items]
Area of land (in acres) \| a				12
Payments to acquire land				$ 128
Life Science \| MASSACHUSETTS
Real Estate [Line Items]
Payments to acquire real estate		$ 72
Life Science \| CALIFORNIA
Real Estate [Line Items]
Payments to acquire real estate		$ 24		$ 20
Number of properties acquired \| property				1
Medical Office Buildings
Real Estate [Line Items]
Number of properties acquired \| property			2	2
Medical Office Buildings \| Mortgage Debt
Real Estate [Line Items]
Debt instrument, face amount				$ 142	$ 142
Medical Office Buildings \| MASSACHUSETTS
Real Estate [Line Items]
Payments to acquire real estate				$ 55
Number of properties acquired \| property				1
Medical Office Buildings \| TEXAS
Real Estate [Line Items]
Payments to acquire real estate	$ 43			$ 60
Number of properties acquired \| property	2			2
Medical Office Buildings \| TENNESSEE
Real Estate [Line Items]
Payments to acquire real estate				$ 13
Number of properties acquired \| property				1
Medical Office Buildings \| COLORADO
Real Estate [Line Items]
Payments to acquire real estate				$ 38
Number of properties acquired \| property				1
Medical Office Buildings \| UNITED STATES
Real Estate [Line Items]
Payments to acquire real estate				$ 371
Number of properties acquired \| property				14
Medical Office Buildings \| FLORIDA
Real Estate [Line Items]
Payments to acquire real estate				$ 16
Number of properties acquired \| property				1
Medical Office Buildings \| KANSAS
Real Estate [Line Items]
Payments to acquire real estate				$ 50
Number of properties acquired \| property				1
Medical Office Buildings \| NEW JERSEY
Real Estate [Line Items]
Payments to acquire real estate				$ 155
Number of properties acquired \| property				3
Medical Office Buildings \| WASHINGTON
Real Estate [Line Items]
Payments to acquire real estate				$ 43
Number of properties acquired \| property				1
Medical Office Buildings \| LOUISIANA
Real Estate [Line Items]
Payments to acquire real estate				$ 34
Number of properties acquired \| property				1