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Impairments of Real Estate (Details) | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2022 USD ($) | Sep. 30, 2021 USD ($) | Jun. 30, 2021 USD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) property | Dec. 31, 2020 USD ($) property | Oct. 31, 2019 property
Impaired Long-Lived Assets Held and Used [Line Items] |  |  |  |  |  |  |
Impairment of real estate |  |  |  | $ 0 |  |  |
Net real estate |  |  |  | 13,023,483,000 | $ 12,667,429,000 |  |
Impairments and loan loss reserves (recoveries), net |  |  |  | 7,004,000 | 55,896,000 | $ 244,253,000 |
Goodwill, impairment loss |  |  |  | 0 | 0 | 0 |
Goodwill |  |  |  | 18,000,000 | 18,000,000 |  |
Insured event loss |  |  |  | (7,168,000) | (1,632,000) | (469,000) |
Planned MOB Demolition, Tenant Relocation And Other Costs |  |  |  |  |  |  |
Impaired Long-Lived Assets Held and Used [Line Items] |  |  |  |  |  |  |
Expense on other | $ 14,000,000 |  |  |  |  |  |
Casualty-Related Losses |  |  |  |  |  |  |
Impaired Long-Lived Assets Held and Used [Line Items] |  |  |  |  |  |  |
Insured event loss |  |  |  | $ 6,000,000 | 5,000,000 | 500,000 |
Minimum |  |  |  |  |  |  |
Impaired Long-Lived Assets Held and Used [Line Items] |  |  |  |  |  |  |
Impairment calculation price range |  |  |  |  |  | $ 13,000 |
Terminal capitalization rate |  |  |  |  |  | 5.50% |
Discount rates |  |  |  |  |  | 8.00% |
Maximum |  |  |  |  |  |  |
Impaired Long-Lived Assets Held and Used [Line Items] |  |  |  |  |  |  |
Impairment calculation price range |  |  |  |  |  | $ 300,000 |
Terminal capitalization rate |  |  |  |  |  | 7.50% |
Discount rates |  |  |  |  |  | 9.50% |
Weighted Average |  |  |  |  |  |  |
Impaired Long-Lived Assets Held and Used [Line Items] |  |  |  |  |  |  |
Impairment calculation price range |  |  |  |  |  | $ 164,000 |
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 |  |
Discontinued Operations |  |  |  |  |  |  |
Impaired Long-Lived Assets Held and Used [Line Items] |  |  |  |  |  |  |
Impairments and loan loss reserves (recoveries), net |  |  |  |  |  | 201,000,000 |
Shop Assets, Senior Housing Triple-net Assets, MOBs, and Other Non-Reportable Asset |  |  |  |  |  |  |
Impaired Long-Lived Assets Held and Used [Line Items] |  |  |  |  |  |  |
Aggregate carrying value before impairment |  |  |  |  |  | 960,000,000 |
Real estate held-for-sale |  |  |  |  |  | $ 750,000,000 |
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 |
Property count | property |  |  |  |  | 4 |  |
Medical Office | Held-for-use |  |  |  |  |  |  |
Impaired Long-Lived Assets Held and Used [Line Items] |  |  |  |  |  |  |
Number of real estate properties impaired | property |  |  |  |  | 1 |  |
Medical Office | Held-for-sale |  |  |  |  |  |  |
Impaired Long-Lived Assets Held and Used [Line Items] |  |  |  |  |  |  |
Number of real estate properties impaired | property |  |  |  |  | 3 |  |
Medical Office | Impairments 2021 | Held-for-use |  |  |  |  |  |  |
Impaired Long-Lived Assets Held and Used [Line Items] |  |  |  |  |  |  |
Impairment of real estate |  |  |  |  | $ 17,000,000 |  |
Medical Office | Impairments 2021 | 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 |  |
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 |
Senior Housing Operating Portfolio | Impairments 2021 |  |  |  |  |  |  |
Impaired Long-Lived Assets Held and Used [Line Items] |  |  |  |  |  |  |
Aggregate carrying value before impairment |  |  |  |  | $ 20,000,000 |  |
Real estate held-for-sale |  |  |  |  | $ 16,000,000 |  |
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 |
Property count | property |  |  |  |  |  |  | 43
MOB Land Parcels |  |  |  |  |  |  |
Impaired Long-Lived Assets Held and Used [Line Items] |  |  |  |  |  |  |
Number of real estate properties impaired | property |  |  |  |  |  | 1 |

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