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Real Estate - 2021 Real Estate Investment Acquisitions (Details) $ in Millions | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2022 USD ($) property | Jan. 31, 2022 USD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) a property | Apr. 30, 2021 USD ($)
Medical Office |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |
Number of properties acquired | property |  |  |  | 2 |
Medical Office | Mortgage Debt |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |
Face amount |  |  |  |  | $ 142
Medical Office | MASSACHUSETTS |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |
Number of properties acquired | property |  |  |  | 1 |
Payments to acquire real estate |  |  |  | $ 55 |
Medical Office | TENNESSEE |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |
Number of properties acquired | property |  |  |  | 1 |
Payments to acquire real estate |  |  |  | $ 13 |
Medical Office | COLORADO |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |
Number of properties acquired | property |  |  |  | 1 |
Payments to acquire real estate |  |  |  | $ 38 |
Medical Office | UNITED STATES |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |
Number of properties acquired | property |  |  |  | 14 |
Payments to acquire real estate |  |  |  | $ 371 |
Medical Office | FLORIDA |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |
Number of properties acquired | property |  |  |  | 1 |
Payments to acquire real estate |  |  |  | $ 16 |
Medical Office | KANSAS |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |
Number of properties acquired | property |  |  |  | 1 |
Payments to acquire real estate |  |  |  | $ 50 |
Medical Office | NEW JERSEY |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |
Number of properties acquired | property |  |  |  | 3 |
Payments to acquire real estate |  |  |  | $ 155 |
Medical Office | TEXAS |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |
Number of properties acquired | property | 2 |  |  | 2 |
Payments to acquire real estate | $ 43 |  |  | $ 60 |
Medical Office | WASHINGTON |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |
Number of properties acquired | property |  |  |  | 1 |
Payments to acquire real estate |  |  |  | $ 43 |
Medical Office | LOUISIANA |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |
Number of properties acquired | property |  |  |  | 1 |
Payments to acquire real estate |  |  |  | $ 34 |
Life Science | MASSACHUSETTS |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |
Number of properties acquired | property |  |  |  | 8 |
Payments to acquire real estate |  | $ 72 | $ 18 | $ 498 |
Life Science | CALIFORNIA |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |
Number of properties acquired | property |  |  |  | 1 |
Payments to acquire real estate |  | $ 24 |  | $ 20 |
Area of land | a |  |  |  | 12 |
Payments to acquire land |  |  |  | $ 128 |

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