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Variable Interest Entities - Narrative (Details) $ in Millions | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2021 USD ($) | Dec. 31, 2024 USD ($) hospital joint_venture | Dec. 31, 2023 joint_venture | Dec. 31, 2022 USD ($)
PropTech |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Payments to acquire equity investments |  | $ 1 |  |
Equity investment, aggregate cost |  | 5.00% |  |
Equity investment, percentage of total fund commitments |  | $ 10 |  |
Funding period |  | 5 years |  |
Lab | Needham Land Parcel JV |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Investment ownership percentage | 38.00% |  |  |
Payments to acquire equity method investment | $ 13 |  |  |
Variable Interest Entity, Not Primary Beneficiary |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Number of unconsolidated joint ventures | joint_venture |  | 2 | 2 |
Variable Interest Entity, Not Primary Beneficiary | Commercial Mortgage-Backed Securities |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Number of hospitals | hospital |  | 3 |  |
Debt securities |  |  |  | $ 22
Ventures V, LLC |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Ownership percentage |  | 51.00% |  |
Downreit Partnerships |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Number of DownREIT LLCs (in entities) | joint_venture |  | 8 | 7 |
Callan Ridge JV |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Ownership percentage |  |  | 98.00% |
MSREI MOB JV |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Ownership percentage |  | 51.00% |  |

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