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Dispositions of Real Estate and Discontinued Operations - Dispositions of Real Estate (Details) |  | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Jan. 31, 2020 USD ($) property | Apr. 30, 2021 USD ($) property | Feb. 28, 2021 USD ($) property | Jan. 31, 2021 USD ($) property | Dec. 31, 2020 USD ($) property | Oct. 31, 2020 USD ($) property | Mar. 31, 2021 USD ($) property | Mar. 31, 2020 USD ($) property | Dec. 31, 2021 USD ($) property | Dec. 31, 2020 USD ($) property
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |
Net cash provided by financing activities |  |  |  |  |  |  | $ (924,119,000) | $ 761,421,000 |  |
Gain on sales of real estate, net |  |  |  |  |  |  | 0 | $ 2,069,000 |  |
Number of properties disposed | property |  |  |  |  |  |  |  | 18 |  |
Disposal Group, Disposed of by Means Other than Sale, Not Discontinued Operations, Abandonment |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |
Gain on sales of real estate, net |  |  |  |  |  |  |  |  |  | $ 283,000,000
Discontinued Operations |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |
Gain on sales of real estate, net |  |  |  |  |  |  |  |  |  | $ 193,000,000
Brookedale MTCA |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |
Gain on sales of real estate, net | $ 164,000,000 |  |  |  |  |  |  |  |  |
Number of properties disposed | property | 18 |  |  |  |  |  |  |  |  | 18
Sunrise Senior Housing Portfolio | SHOP |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |
Net cash provided by financing activities |  |  |  | $ 410,000,000 |  |  |  |  |  |
Capital expenditure funding, amount committed |  |  |  | 92,000,000 |  |  |  |  |  |
Capital expenditure funding, amount funded |  |  |  |  |  |  | 0 |  |  |
SHOP |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |
Proceeds from sale of buildings |  |  |  | 230,000,000 |  |  | 5,000,000 | $ 36,000,000 |  | $ 190,000,000
Net cash provided by financing activities |  |  |  | 150,000,000 |  |  |  |  |  |
Gain on sales of real estate, net |  |  |  | 59,000,000 |  |  | $ (16,000,000) |  |  |
SHOP | Subsequent Event |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |
Proceeds from sale of buildings |  | $ 13,000,000 |  |  |  |  |  |  |  |
SHOP | Atria SHOP Portfolio |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |
Number of assets to be sold | property |  |  |  |  | 12 |  |  |  |  |
Proceeds from sale of buildings |  |  |  |  | $ 312,000,000 |  |  |  |  |
Gain on sales of real estate, net |  |  |  |  | 39,000,000 |  |  |  |  |
SHOP | Oakmont SHOP Portfolio | Subsequent Event |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |
Proceeds from sale of buildings |  | 564,000,000 |  |  |  |  |  |  |  |
SHOP | Discovery SHOP Portfolio | Subsequent Event |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |
Proceeds from sale of buildings |  | 334,000,000 |  |  |  |  |  |  |  |
Proceeds from sale of loans and preferred equity method investments |  | 21,000,000 |  |  |  |  |  |  |  |
SHOP | Sonata SHOP Portfolio | Subsequent Event |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |
Proceeds from sale of buildings |  | 64,000,000 |  |  |  |  |  |  |  |
Senior housing triple-net |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |
Number of assets to be sold | property |  |  |  |  |  |  |  |  |  | 21
Proceeds from sale of buildings |  |  |  |  |  |  |  | 385,000,000 |  | $ 428,000,000
Senior housing triple-net | Subsequent Event |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |
Proceeds from sale of buildings |  | $ 7,000,000 |  |  |  |  |  |  |  |
Senior housing triple-net | Brookdale Triple Net Portfolio |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |
Proceeds from sale of buildings |  |  |  | 510,000,000 |  |  |  |  |  |
Gain on sales of real estate, net |  |  |  | $ 169,000,000 |  |  |  |  |  |
Senior housing triple-net | HRA Triple Net Portfolio |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |
Proceeds from sale of buildings |  |  | $ 132,000,000 |  |  |  |  |  |  |
Gain on sales of real estate, net |  |  | $ 33,000,000 |  |  |  |  |  |  |
Senior housing triple-net | Aegis NNN Portfolio |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |
Proceeds from sale of buildings |  |  |  |  | 358,000,000 |  |  |  |  |
Gain on sales of real estate, net |  |  |  |  | $ 228,000,000 |  |  |  |  |
Senior Housing Operating Portfolio and Senior Housing Triple-Net |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |
Gain on sales of real estate, net |  |  |  |  |  |  |  | $ 165,000,000 |  |
Medical office |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |
Proceeds from sale of buildings |  |  |  |  |  |  |  |  |  | 136,000,000
MOB Land Parcels |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |
Proceeds from sale of buildings |  |  |  |  |  |  |  |  |  | $ 3,000,000
SHOP |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |
Number of assets to be sold | property |  |  |  | 16 |  |  | 1 | 7 |  | 23
SHOP | Subsequent Event |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |
Number of assets to be sold | property |  | 2 |  |  |  |  |  |  |  |
SHOP | Atria SHOP Portfolio |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |
Number of assets to be sold | property |  |  |  |  | 4 |  |  |  |  |
Proceeds from sale of buildings |  |  |  |  | $ 94,000,000 |  |  |  |  |
Net cash provided by financing activities |  |  |  |  | $ 61,000,000 |  |  |  |  |
SHOP | Sunrise Senior Housing Portfolio |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |
Number of assets to be sold | property |  |  |  | 32 |  |  |  |  |  |
Proceeds from sale of buildings |  |  |  | $ 664,000,000 |  |  |  |  |  |
Net cash provided by financing activities |  |  |  | $ 410,000,000 |  |  |  |  |  |
SHOP | Sunrise Senior Housing Portfolio | Subsequent Event |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |
Number of assets to be sold | property |  |  |  |  |  |  |  |  | 2 |
SHOP | SLC SHOP Portfolio |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |
Number of assets to be sold | property |  |  |  |  |  | 7 |  |  |  |
SHOP | SLC SHOP Portfolio | Definitive Agreement Four |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |
Proceeds from sale of buildings |  |  |  |  |  | $ 115,000,000 |  |  |  |
SHOP | SLC SHOP Portfolio | Definitive Agreement Four | Subsequent Event |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |
Proceeds from deposits on real estate sales |  |  |  |  |  |  |  |  | $ 3,000,000 |
SHOP | Oakmont SHOP Portfolio | Subsequent Event |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |
Number of assets to be sold | property |  | 12 |  |  |  |  |  |  |  |
SHOP | Discovery SHOP Portfolio | Subsequent Event |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |
Number of assets to be sold | property |  | 10 |  |  |  |  |  |  |  |
Number of preferred equity method investments sold | property |  | 2 |  |  |  |  |  |  |  |
SHOP | Discovery SHOP Portfolio | Subsequent Event | Secured Loans |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |
Number of loan receivables | property |  | 2 |  |  |  |  |  |  |  |
SHOP | Sonata SHOP Portfolio | Subsequent Event |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |
Number of assets to be sold | property |  | 5 |  |  |  |  |  |  |  |
Senior housing triple-net |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |
Number of assets to be sold | property |  |  |  |  |  |  |  | 18 |  |
Senior housing triple-net | Subsequent Event |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |
Number of assets to be sold | property |  | 2 |  |  |  |  |  |  |  |
Senior housing triple-net | Brookdale Triple Net Portfolio |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |
Number of assets to be sold | property |  |  |  | 24 |  |  |  |  |  |
Senior housing triple-net | HRA Triple Net Portfolio |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |
Number of assets to be sold | property |  |  | 8 |  |  |  |  |  |  |
Senior housing triple-net | Aegis NNN Portfolio |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |
Number of assets to be sold | property |  |  |  |  | 10 |  |  |  |  |
Medical office |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |
Number of assets to be sold | property |  |  |  |  |  |  |  |  |  | 11
Medical office | Subsequent Event |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |
Number of assets to be sold | property |  | 1 |  |  |  |  |  |  |  |
Proceeds from sale of buildings |  | $ 10,000,000 |  |  |  |  |  |  |  |
Medical office | San Diego |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |
Number of assets to be sold | property |  |  |  |  |  |  |  |  |  | 3
MOB Land Parcels |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |
Number of assets to be sold | property |  |  |  |  |  |  |  |  |  | 2
Other Non-reportable Segments |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |
Number of assets to be sold | property |  |  |  |  |  |  |  |  |  | 1
Proceeds from sale of buildings |  |  |  |  |  |  |  |  |  | $ 1,000,000

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