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Impairments of Real Estate (Details) | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2021 USD ($) | Jun. 30, 2021 USD ($) | Jun. 30, 2019 USD ($) | Dec. 31, 2021 USD ($) property | Dec. 31, 2020 USD ($) property | Dec. 31, 2019 USD ($) property | Jan. 31, 2020 property | Oct. 31, 2019 property
Impaired Long-Lived Assets Held and Used [Line Items] |  |  |  |  |  |  |  |
Number of real estate properties impaired | property |  |  |  |  |  | 3 |  |
Property count | property |  |  |  |  |  |  | 15 |
Net real estate |  |  |  | $ 12,667,429,000 | $ 11,119,758,000 |  |  |
Impairments and loan loss reserves (recoveries), net |  |  |  | 23,160,000 | 42,909,000 | $ 17,708,000 |  |
Asset impairment charge |  |  |  |  |  | 18,000,000 |  |
Goodwill, impairment loss |  |  |  | 0 | 0 | 0 |  |
Goodwill |  |  |  | 18,000,000 | 18,000,000 |  |  |
Held-for-sale |  |  |  |  |  |  |  |
Impaired Long-Lived Assets Held and Used [Line Items] |  |  |  |  |  |  |  |
Goodwill, impairment loss | $ 22,000,000 | $ 7,000,000 |  | 29,000,000 |  |  |  |
Goodwill |  |  |  | 0 | 29,000,000 |  |  |
Discontinued Operations |  |  |  |  |  |  |  |
Impaired Long-Lived Assets Held and Used [Line Items] |  |  |  |  |  |  |  |
Impairments and loan loss reserves (recoveries), net |  |  |  |  | $ 201,000,000 |  |  |
Asset impairment charge |  |  |  |  |  | $ 9,000,000 |  |
Medical Office |  |  |  |  |  |  |  |
Impaired Long-Lived Assets Held and Used [Line Items] |  |  |  |  |  |  |  |
Impairment of real estate |  |  |  | $ 22,000,000 |  |  |  |
Number of real estate properties impaired | property |  |  |  | 3 | 5 | 3 |  |
Property count | property |  |  |  | 4 |  |  |  |
Impairments and loan loss reserves (recoveries), net |  |  |  |  |  | $ 4,000,000 |  |
Number of properties intended to be demolished | property |  |  |  |  |  | 1 |  |
Number of real estate properties impaired, candidates for potential sale | property |  |  |  |  |  | 2 |  |
Medical Office | Held-for-sale |  |  |  |  |  |  |  |
Impaired Long-Lived Assets Held and Used [Line Items] |  |  |  |  |  |  |  |
Number of real estate properties impaired | property |  |  |  | 3 |  |  |  |
Medical Office | Held-for-use |  |  |  |  |  |  |  |
Impaired Long-Lived Assets Held and Used [Line Items] |  |  |  |  |  |  |  |
Number of real estate properties impaired | property |  |  |  | 1 |  |  |  |
Senior Housing Operating Portfolio |  |  |  |  |  |  |  |
Impaired Long-Lived Assets Held and Used [Line Items] |  |  |  |  |  |  |  |
Impairment of real estate |  |  |  | $ 4,000,000 |  |  |  |
Number of real estate properties impaired | property |  |  |  | 1 | 42 | 27 |  |
Impairments and loan loss reserves (recoveries), net |  |  | $ 10,000,000 |  |  |  |  |
Number of real estate properties impaired, candidates for potential sale | property |  |  |  |  |  | 1 |  |
Life Science |  |  |  |  |  |  |  |
Impaired Long-Lived Assets Held and Used [Line Items] |  |  |  |  |  |  |  |
Impairments and loan loss reserves (recoveries), net |  |  |  |  | $ 15,000,000 |  |  |
Number of properties intended to be demolished | property |  |  |  |  | 1 |  |  |
Senior Housing Triple Net, SHOP, and MOB |  |  |  |  |  |  |  |
Impaired Long-Lived Assets Held and Used [Line Items] |  |  |  |  |  |  |  |
Impairments and loan loss reserves (recoveries), net |  |  |  |  | $ 210,000,000 |  |  |
Senior Housing Triple Net |  |  |  |  |  |  |  |
Impaired Long-Lived Assets Held and Used [Line Items] |  |  |  |  |  |  |  |
Number of real estate properties impaired | property |  |  |  |  | 5 | 8 |  |
Property count | property |  |  |  |  |  |  |  | 43
MOB Land Parcels |  |  |  |  |  |  |  |
Impaired Long-Lived Assets Held and Used [Line Items] |  |  |  |  |  |  |  |
Number of real estate properties impaired | property |  |  |  |  | 1 |  |  |
Senior Housing Triple Net, SHOP, MOB, and Other Non-Reportable |  |  |  |  |  |  |  |
Impaired Long-Lived Assets Held and Used [Line Items] |  |  |  |  |  |  |  |
Impairments and loan loss reserves (recoveries), net |  |  |  |  |  | $ 194,000,000 |  |
Senior Housing Triple Net, SHOP, MOB, and Other Non-Reportable | Discontinued Operations |  |  |  |  |  |  |  |
Impaired Long-Lived Assets Held and Used [Line Items] |  |  |  |  |  |  |  |
Impairments and loan loss reserves (recoveries), net |  |  |  |  |  | $ 189,000,000 |  |
Other Non-Reporting Segment |  |  |  |  |  |  |  |
Impaired Long-Lived Assets Held and Used [Line Items] |  |  |  |  |  |  |  |
Number of real estate properties impaired | property |  |  |  |  |  | 1 |  |
Impairments 2021 | Medical Office | Held-for-sale |  |  |  |  |  |  |  |
Impaired Long-Lived Assets Held and Used [Line Items] |  |  |  |  |  |  |  |
Impairment of real estate |  |  |  | $ 5,000,000 |  |  |  |
Net real estate |  |  |  | 14,000,000 |  |  |  |
Impairments 2021 | Medical Office | Held-for-use |  |  |  |  |  |  |  |
Impaired Long-Lived Assets Held and Used [Line Items] |  |  |  |  |  |  |  |
Impairment of real estate |  |  |  | 17,000,000 |  |  |  |
Impairments 2021 | Senior Housing Operating Portfolio |  |  |  |  |  |  |  |
Impaired Long-Lived Assets Held and Used [Line Items] |  |  |  |  |  |  |  |
Real estate held-for-sale |  |  |  | 16,000,000 |  |  |  |
Aggregate carrying value before impairment |  |  |  | $ 20,000,000 |  |  |  |
Shop Assets, Senior Housing Triple-net Assets, MOBs, and Other Non-Reportable Asset |  |  |  |  |  |  |  |
Impaired Long-Lived Assets Held and Used [Line Items] |  |  |  |  |  |  |  |
Real estate held-for-sale |  |  |  |  | $ 750,000,000 | $ 223,000,000 |  |
Aggregate carrying value before impairment |  |  |  |  | 960,000,000 | 416,000,000 |  |
Minimum |  |  |  |  |  |  |  |
Impaired Long-Lived Assets Held and Used [Line Items] |  |  |  |  |  |  |  |
Impairment calculation price range |  |  |  |  | $ 13,000 | $ 24,000 |  |
Terminal capitalization rate |  |  |  |  | 5.50% |  |  |
Discount rates |  |  |  |  | 8.00% |  |  |
Market capitalization rate |  |  |  |  |  | 4.97% |  |
Maximum |  |  |  |  |  |  |  |
Impaired Long-Lived Assets Held and Used [Line Items] |  |  |  |  |  |  |  |
Impairment calculation price range |  |  |  |  | $ 300,000 | $ 125,000 |  |
Terminal capitalization rate |  |  |  |  | 7.50% |  |  |
Discount rates |  |  |  |  | 9.50% |  |  |
Market capitalization rate |  |  |  |  |  | 8.27% |  |
Weighted Average |  |  |  |  |  |  |  |
Impaired Long-Lived Assets Held and Used [Line Items] |  |  |  |  |  |  |  |
Impairment calculation price range |  |  |  |  | $ 164,000 | $ 73,000 |  |
Market capitalization rate |  |  |  |  |  | 6.22% |  |

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