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Dispositions of Real Estate and Discontinued Operations - Dispositions of Real Estate (Details) $ / item in Thousands, $ in Millions | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2020 USD ($) $ / item property | Mar. 31, 2021 USD ($) | Dec. 31, 2020 USD ($)
Real Estate [Line Items] |  |  |
Impairment of real estate | $ 31 |  |
Deferred tax assets, valuation allowance |  | $ 35 | $ 33
Minimum |  |  |
Real Estate [Line Items] |  |  |
Impairment test, market capitalization rate | 7.16% |  |
Impairment calculation, price per unit | $ / item | 38 |  |
Maximum |  |  |
Real Estate [Line Items] |  |  |
Impairment test, market capitalization rate | 9.92% |  |
Impairment calculation, price per unit | $ / item | 95 |  |
Weighted Average |  |  |
Real Estate [Line Items] |  |  |
Impairment test, market capitalization rate | 9.32% |  |
Impairment calculation, price per unit | $ / item | 68 |  |
Discontinued Operations |  |  |
Real Estate [Line Items] |  |  |
Impairment of real estate | $ 28 |  |
Impairments 2020 |  |  |
Real Estate [Line Items] |  |  |
Real estate investment property, aggregate carrying value before impairment | 200 |  |
Real estate held-for-sale | $ 169 |  |
SHOP |  |  |
Real Estate [Line Items] |  |  |
Number of real estate properties impaired | property | 15 |  |
Senior housing triple-net |  |  |
Real Estate [Line Items] |  |  |
Number of real estate properties impaired | property | 2 |  |
Medical office |  |  |
Real Estate [Line Items] |  |  |
Number of real estate properties impaired | property | 2 |  |

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