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Variable Interest Entities - Narrative (Details) $ in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2021 USD ($) joint_venture | Dec. 31, 2022 USD ($) joint_venture hospital | Dec. 31, 2021 USD ($) property joint_venture
Variable Interest Entity [Line Items] |  |  |
Number of hospitals | hospital |  | 3 |
Carrying value of exchange accommodation titleholder, carrying value | $ | $ 77 |  | $ 77
Life Science | Needham Land Parcel JV |  |  |
Variable Interest Entity [Line Items] |  |  |
Investment ownership percentage | 38.00% | 38.00% | 38.00%
Payments to acquire equity method investments | $ | $ 13 |  |
Life Science | Life Science JV |  |  |
Variable Interest Entity [Line Items] |  |  |
Investment ownership percentage |  | 49.00% |
Medical Office |  |  |
Variable Interest Entity [Line Items] |  |  |
Number of properties acquired | property |  |  | 2
Variable Interest Entity, Not Primary Beneficiary |  |  |
Variable Interest Entity [Line Items] |  |  |
Number of unconsolidated joint ventures | joint_venture | 2 | 2 | 2
Number of VIE borrowers with marketable debt securities | joint_venture | 1 | 1 | 1
Variable Interest Entity, Not Primary Beneficiary | Commercial Mortgage-Backed Securities |  |  |
Variable Interest Entity [Line Items] |  |  |
Debt securities | $ |  | $ 22 |
Ventures V, LLC |  |  |
Variable Interest Entity [Line Items] |  |  |
Ownership percentage |  | 51.00% |
MSREI MOB JV |  |  |
Variable Interest Entity [Line Items] |  |  |
Ownership percentage |  | 51.00% |
DownREIT Partnerships |  |  |
Variable Interest Entity [Line Items] |  |  |
Controlling interest entity controlling ownership interest | joint_venture |  | 7 |
Life Science JV |  |  |
Variable Interest Entity [Line Items] |  |  |
Ownership percentage |  | 99.00% |

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- Definition Number Of Hospitals + References No definition available. + Details
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- Definition Number Of Properties Acquired + 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 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 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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