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Segment Disclosures - Narrative (Details) | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2020 USD ($) property | Dec. 31, 2019 USD ($) facility | Dec. 31, 2018 USD ($) | Mar. 31, 2020 property | Jan. 31, 2020 facility property | Oct. 31, 2019 property | Nov. 30, 2017 property
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Property count | property |  |  |  |  | 15 |  |
Goodwill, impairment loss | $ 0 | $ 0 | $ 0 |  |  |  |
Goodwill | 18,000,000 | $ 17,000,000 |  |  |  |  |
Other Non-Reporting Segment |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Number of deconsolidating assets | facility |  | 19 |  |  |  |  |
Other Non-Reporting Segment | Operating segment |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Goodwill | 2,000,000 | $ 4,000,000 |  |  |  |  |
Goodwill, transfers | (2,000,000) |  |  |  |  |  |
Senior Housing Operating Portfolio |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Number of deconsolidating assets | property |  |  |  | 19 |  |  |
Senior Housing Operating Portfolio | Operating segment |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Goodwill, transfers | (1,000,000) |  |  |  |  |  |
Senior Housing Triple Net | Operating segment |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Goodwill, transfers | 1,000,000 |  |  |  |  |  |
Medical Office | Operating segment |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Goodwill | 14,000,000 | $ 13,000,000 |  |  |  |  |
CCRC | Operating segment |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Goodwill | 2,000,000 |  |  |  |  |  |
Goodwill, transfers | $ 2,000,000 |  |  |  |  |  |
Assets leased to others | Other Non-Reporting Segment |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Property count | property |  |  |  | 1 |  |  |
Assets leased to others | Senior Housing Triple Net |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Property count | property |  |  |  |  |  | 43 | 78
CCRC JV Investment | CCRC |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Property count | facility |  |  |  |  | 15 |  |
CCRC JV Investment | Assets leased to others | Other Non-Reporting Segment |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Property count | property |  |  |  | 15 |  | 15 |
Brookedale MTCA | Assets leased to others | Other Non-Reporting Segment |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Property count | property |  |  |  |  | 13 |  |
Brookedale MTCA | CCRC JV Investment |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Property count | property |  |  |  |  | 15 |  |
Brookedale MTCA | CCRC JV Investment | CCRC |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Property count | facility |  |  |  |  | 13 |  |
Brookedale MTCA | CCRC JV Investment | Assets leased to others | Other Non-Reporting Segment |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Ownership interest acquired |  |  |  | 100.00% |  |  |
Property count | property | 13 |  |  | 13 | 13 |  |

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