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Variable Interest Entities - Narrative (Details) $ in Millions | 1 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Dec. 31, 2021 USD ($) | Jun. 30, 2024 joint_venture hospital | Dec. 31, 2023 joint_venture | Dec. 31, 2022 USD ($)
Needham Land Parcel JV | Lab Buildings |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Investment ownership percentage | 38.00% | 38.00% |  |
Cash paid | $ | $ 13 |  |  |
Unconsolidated Variable Interest Entities |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Number of unconsolidated joint ventures (in joint ventures) | joint_venture |  | 2 | 2 |
Unconsolidated Variable Interest Entities | Commercial Mortgage-Backed Securities |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Number of hospitals | hospital |  | 3 |  |
Debt securities | $ |  |  |  | $ 22
Ventures V |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
VIE ownership percentage |  | 51.00% |  |
MSREI JV |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
VIE ownership percentage |  | 51.00% |  |
DownREIT Partnerships |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Number of DownREIT LLCs | joint_venture |  | 8 | 7 |
Lab JV |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
VIE ownership percentage |  | 98.00% |  |

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