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Variable Interest Entities - Narrative (Details) $ in Millions | 1 Months Ended | 3 Months Ended |
--- | --- | --- | ---
Dec. 31, 2021 USD ($) | Mar. 31, 2023 joint_venture hospital | Dec. 31, 2022 USD ($) joint_venture
Life Science | Needham Land Parcel JV |  |  |
Variable Interest Entity [Line Items] |  |  |
Investment ownership percentage | 38.00% | 38.00% |
Payments to acquire equity method investment | $ | $ 13 |  |
Unconsolidated Variable Interest Entities |  |  |
Variable Interest Entity [Line Items] |  |  |
Number of unconsolidated joint ventures (in joint ventures) |  | 2 | 2
Number of VIE borrowers with marketable debt securities (in joint ventures) |  |  | 1
Unconsolidated Variable Interest Entities | Commercial Mortgage-Backed Securities |  |  |
Variable Interest Entity [Line Items] |  |  |
Debt securities | $ |  |  | $ 22
Number of hospitals | hospital |  | 3 |
Ventures V |  |  |
Variable Interest Entity [Line Items] |  |  |
VIE ownership percentage |  | 51.00% |
Life Science JV |  |  |
Variable Interest Entity [Line Items] |  |  |
VIE ownership percentage |  | 98.00% |
MSREI JV |  |  |
Variable Interest Entity [Line Items] |  |  |
VIE ownership percentage |  | 51.00% |
DownREIT Partnerships |  |  |
Variable Interest Entity [Line Items] |  |  |
Number of controlling ownership interest entities as a managing member |  | 7 |

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- Definition Number Of Hospitals + References No definition available. + Details
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- Definition Represents number of unconsolidated joint ventures between entity and an institutional capital partner. + References No definition available. + Details
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- Definition The number of VIE borrowers in which the entity has invested in marketable debt securities. + References No definition available. + Details
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- Definition Represents the number of controlling ownership interest entities, in which the company holds the interest and is the managing member of the partnership. + References No definition available. + Details
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- Definition Amount, after allowance for credit loss, of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), investment in debt security measured at amortized cost (held-to-maturity), and investment in debt security measured at fair value with change in fair value recognized in net income (trading). + References No definition available. + Details
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- Definition The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI https://asc.fasb.org/extlink&oid=114001798&loc=d3e33918-111571 + Details
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- Definition The cash outflow associated with the purchase of or advances to an equity method investments, which are investments in joint ventures and entities in which the entity has an equity ownership interest normally of 20 to 50 percent and exercises significant influence. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3213-108585 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Percentage of the Variable Interest Entity's (VIE) voting interest owned by (or beneficial interest in) the reporting entity (directly or indirectly). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 5A -Subparagraph (d) -URI https://asc.fasb.org/extlink&oid=123419778&loc=SL6759159-111685 + Details
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