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Variable Interest Entities - Narrative (Details) $ in Millions | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Dec. 31, 2021 USD ($) property tenant joint_venture | Sep. 30, 2021 loan | Jun. 30, 2021 property | May 31, 2021 property | Apr. 30, 2021 preferred_equity_investment property | Jan. 31, 2021 property | Dec. 31, 2021 USD ($) entity property tenant joint_venture loan | Dec. 31, 2020 USD ($) property loan tenant joint_venture | Dec. 31, 2019 property | Jan. 31, 2020 property | Oct. 31, 2019 property
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of unconsolidated joint ventures | 3 |  |  |  |  |  | 3 |  |  |  |
Term of facility |  |  |  |  |  |  | 2 months | 1 month |  |  |
Property count |  |  |  |  |  |  |  |  |  | 15 |
Number of loans sold | loan |  |  |  |  |  |  | 6 | 3 |  |  |
Carrying value of exchange accommodation titleholder, carrying value | $ | $ 77 |  |  |  |  |  | $ 77 | $ 813 |  |  |
VIE tenants-operating leases |  |  |  |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of properties leased |  |  |  |  |  |  |  | 2 |  |  |
Variable Interest Entity, Not Primary Beneficiary |  |  |  |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |  |  |
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 | loan |  |  |  |  |  |  |  | 1 |  |  |
Mezzanine |  |  |  |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of loans sold | loan |  | 1 |  |  |  |  |  |  |  |  |
VIE tenants-operating leases |  |  |  |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of unconsolidated joint ventures | joint_venture | 2 |  |  |  |  |  | 2 |  |  |  |
Number of properties leased |  |  |  |  |  |  |  | 2 |  |  |
Number of VIE borrowers with marketable debt securities | joint_venture | 1 |  |  |  |  |  | 1 |  |  |  |
Number of VIE tenants | tenant |  |  |  |  |  |  |  | 1 |  |  |
CCRC JV Investment |  |  |  |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |  |  |
Investment ownership percentage |  |  |  | 49.00% |  |  |  |  | 49.00% | 49.00% |
Ownership percentage |  |  |  |  |  |  |  | 49.00% |  |  |
CCRC JV Investment | Brookedale MTCA |  |  |  |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of assets sold |  |  |  | 2 |  |  |  |  |  |  |
Ventures V, LLC |  |  |  |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |  |  |
Ownership percentage |  |  |  |  |  |  | 51.00% |  |  |  |
Life Science JV |  |  |  |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |
Life science |  |  |  |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of properties acquired |  |  |  |  |  |  |  | 3 |  |  |
Life science | Needham Land Parcel JV |  |  |  |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |  |  |
Investment ownership percentage | 38.00% |  |  |  |  |  | 38.00% |  |  |  |
Payments to acquire equity method investments | $ | $ 13 |  |  |  |  |  |  |  |  |  |
Property count | 0 |  |  |  |  |  | 0 |  |  |  |
Life science | Life Science JV |  |  |  |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |  |  |
Investment ownership percentage | 49.00% |  |  |  |  |  | 49.00% |  |  |  |
Property count | 1 |  |  |  |  |  | 1 |  |  |  |
Senior Housing Triple Net |  |  |  |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of assets sold |  |  |  |  |  |  |  |  | 2 |  |
Property count |  |  |  |  |  |  |  |  |  |  | 43
Senior Housing Triple Net | Loan-seller Financing |  |  |  |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |  |  |
Term of facility |  |  |  |  |  |  | 5 years |  |  |  |
Senior Housing Triple Net | Sunrise Senior Housing Portfolio |  |  |  |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of assets sold |  |  | 2 |  |  |  |  |  |  |  |
Senior Housing Triple Net | Loan-seller Financing |  |  |  |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of VIE tenants | tenant | 7 |  |  |  |  |  | 7 |  |  |  |
Senior Housing Operating Portfolio |  |  |  |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of assets sold |  |  |  |  |  | 16 |  |  | 18 |  |
Senior Housing Operating Portfolio | Sunrise Senior Housing Portfolio |  |  |  |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of assets sold |  |  | 2 |  |  | 32 |  |  |  |  |
Senior Housing Operating Portfolio | Discovery SHOP Portfolio |  |  |  |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of assets sold |  |  |  |  | 10 |  |  |  |  |  |
Number of preferred equity method investments sold | preferred_equity_investment |  |  |  |  | 2 |  |  |  |  |  |
Senior Housing Operating Portfolio | Mezzanine | Discovery SHOP Portfolio |  |  |  |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of loans sold |  |  |  |  | 2 |  |  |  |  |  |
Other Non-Reporting Segment | Brookedale MTCA |  |  |  |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |  |  |
Property count |  |  |  |  |  |  |  |  |  | 13 |
Other Non-Reporting Segment | Development Investment |  |  |  |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |  |  |
Property count |  |  |  |  |  |  |  | 2 |  |  |
Medical Office |  |  |  |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of assets sold |  |  |  |  |  |  |  |  | 11 |  |
Property count | 4 |  |  |  |  |  | 4 |  |  |  |
Number of properties acquired |  |  |  |  |  |  | 2 | 7 |  |  |
Hospital |  |  |  |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of properties acquired |  |  |  |  |  |  |  | 1 |  |  |

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