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Variable Interest Entities - Narrative (Details) $ in Thousands, £ in Millions | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Jul. 31, 2020 property | Mar. 31, 2018 USD ($) | Mar. 31, 2018 GBP (£) | Dec. 31, 2020 USD ($) joint_venture tenant asset entity property | Dec. 31, 2019 USD ($) | Dec. 31, 2016 USD ($) property | Jan. 31, 2020 property | Mar. 31, 2018 GBP (£) | Dec. 31, 2016 GBP (£) property
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |
Number of unconsolidated joint ventures |  |  |  | 3 |  |  |  |  |
Term of facility |  |  |  | 1 month | 1 month |  |  |  |
Carrying value of exchange accommodation titleholder, carrying value | $ |  |  |  | $ 813,000 |  |  |  |  |
Loans receivable including loans receivable held for sale | $ |  |  |  | 195,375 | $ 190,579 |  |  |  |
Fair value of net assets | $ |  |  |  | 15,920,089 | 14,032,891 |  |  |  |
Net deferred tax liabilities | $ |  |  |  | $ 8,575,517 | $ 7,365,417 |  |  |  |
Property count |  |  |  |  |  |  | 15 |  |
VIE Tenants-Operating Leases |  |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |
Number of properties leased |  |  |  | 2 |  |  |  |  |
Number of unconsolidated joint ventures | joint_venture |  |  |  | 4 |  |  |  |  |
Number of VIE borrowers with marketable debt securities | joint_venture |  |  |  | 1 |  |  |  |  |
Number of VIE borrowers with debt securities and loan | joint_venture |  |  |  | 1 |  |  |  |  |
Number of VIE tenants | tenant |  |  |  | 1 |  |  |  |  |
Unconsolidated joint ventures |  |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |
Ownership percentage |  |  |  | 49.00% |  |  |  |  |
HCP Ventures V |  |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |
Ownership percentage |  |  |  | 51.00% |  |  |  |  |
Life Science JVs |  |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |
Number of unconsolidated joint ventures |  |  |  | 1 |  |  |  |  |
Ownership percentage |  |  |  | 99.00% |  |  |  |  |
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 | entity |  |  |  | 7 |  |  |  |  |
Consolidated Lessees |  |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |
Number of properties leased |  |  |  | 7 |  |  |  |  |
MMCG |  |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |
Loans receivable including loans receivable held for sale |  |  |  |  |  | $ 131,000 |  |  | £ 105
Number of properties |  |  |  |  |  | 7 |  |  | 7
Period of call-option retained |  |  |  |  |  | 3 years |  |  |
Loss on consolidation |  | $ 41,000 | £ 29 |  |  |  |  |  |
Tax benefit |  | 3,000 | £ 2 |  |  |  |  |  |
Fair value of net assets |  | 5,000 |  |  |  |  |  | £ 4 |
Net deferred tax liabilities |  | 13,000 |  |  |  |  |  | 9 |
Property, Plant and Equipment | MMCG |  |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |
Fair value of net assets |  | $ 114,000 |  |  |  |  |  | £ 81 |
Other Non-Reporting Segment | Development Investment |  |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |
Property count |  |  |  | 2 |  |  |  |  |
Senior Housing Triple Net | Loan-seller Financing |  |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |
Number of VIE tenants | tenant |  |  |  | 7 |  |  |  |  |
Loans receivable | $ |  |  |  | $ 10,000 |  |  |  |  |
Term of facility |  |  |  | 5 years |  |  |  |  |
Medical Office |  |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |
Number of properties acquired | 1 |  |  | 7 |  |  |  |  |
Hospital |  |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |
Number of properties acquired | asset |  |  |  | 1 |  |  |  |  |
Life Science |  |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |
Number of properties acquired | asset |  |  |  | 3 |  |  |  |  |

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