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Real Estate Transactions - Real Estate Investments (Details) $ in Millions | 1 Months Ended | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
May 31, 2022 USD ($) property | Mar. 31, 2022 USD ($) property | Jan. 31, 2022 USD ($) | Jun. 30, 2022 property | Mar. 31, 2022 property | Dec. 31, 2021 USD ($) 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 |  |  |  | 1 | 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 | ARKANSAS |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |
Payments to acquire real estate | $ 26 |  |  |  |  |  |
Number of properties acquired | property | 1 |  |  |  |  |  |
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 |

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