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Dispositions of Real Estate and Discontinued Operations - Impairments of Real Estate (Details) $ / item in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2021 USD ($) property | Jun. 30, 2021 USD ($) | Sep. 30, 2020 USD ($) property | Sep. 30, 2021 USD ($) property | Sep. 30, 2020 USD ($) $ / item property | Dec. 31, 2020 USD ($)
Real Estate [Line Items] |  |  |  |  |  |
Impairment of real estate |  |  | $ 37,000,000 |  | $ 87,000,000 |
Goodwill, impairment loss | $ 0 |  | 0 | $ 0 | $ 0 |
Goodwill | 0 |  |  | 0 |  |
Deferred tax assets, valuation allowance | $ 36,000,000 |  |  | $ 36,000,000 |  | $ 33,000,000
Number of properties impaired | property | 2 |  |  | 2 |  |
Minimum |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |
Impairment calculation, price per unit | $ / item |  |  |  |  | 33 |
Maximum |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |
Impairment calculation, price per unit | $ / item |  |  |  |  | 300 |
Weighted Average |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |
Impairment calculation, price per unit | $ / item |  |  |  |  | 136 |
Discontinued Operations |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |
Impairment of real estate |  |  | 36,000,000 |  | $ 82,000,000 |
Held-for-sale |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |
Goodwill, impairment loss | $ 22,000,000 | $ 7,000,000 |  | $ 29,000,000 |  |
Goodwill | 0 |  |  | 0 |  | $ 29,000,000
Impairments 2020, Group One |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |
Real estate investment property, aggregate carrying value before impairment |  |  | 200,000,000 |  | 200,000,000 |
Real estate held-for-sale |  |  | 163,000,000 |  | 163,000,000 |
Impairments 2020, Group Two |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |
Real estate investment property, aggregate carrying value before impairment |  |  | 424,000,000 |  | 424,000,000 |
Real estate held-for-sale |  |  | $ 337,000,000 |  | $ 337,000,000 |
SHOP |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |
Impairment of real estate |  |  |  | $ 4,000,000 |  |
Number of real estate properties impaired | property |  |  | 9 | 1 | 28 |
SHOP | Impairments 2021 |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |
Real estate investment property, aggregate carrying value before impairment | 20,000,000 |  |  | $ 20,000,000 |  |
Real estate held-for-sale | 16,000,000 |  |  | 16,000,000 |  |
Senior housing triple-net |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |
Number of real estate properties impaired | property |  |  | 1 |  | 5 |
Medical office |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |
Impairment of real estate | $ 2,000,000 |  |  | $ 2,000,000 |  |
Number of real estate properties impaired | property | 2 |  | 1 | 2 | 2 |
Medical office | Impairments 2021 |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |
Real estate investment property, aggregate carrying value before impairment | $ 13,000,000 |  |  | $ 13,000,000 |  |
Real estate held-for-sale | $ 11,000,000 |  |  | $ 11,000,000 |  |
Undeveloped MOB land parcel |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |
Number of real estate properties impaired | property |  |  |  |  | 1 |

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