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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 ($) property | Sep. 30, 2021 loan | Jun. 30, 2021 USD ($) property | May 31, 2021 USD ($) property | Apr. 30, 2021 USD ($) property | Mar. 31, 2021 USD ($) property | Feb. 28, 2021 USD ($) property | Jan. 31, 2021 USD ($) property | Dec. 31, 2020 USD ($) property | Sep. 30, 2021 USD ($) property | Mar. 31, 2021 USD ($) property | Sep. 30, 2020 USD ($) property | Sep. 30, 2021 USD ($) property | Sep. 30, 2020 USD ($) property | Dec. 31, 2020 USD ($) property
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on sales of real estate, net |  |  |  |  |  |  |  |  |  | $ 14,635,000 |  | $ 2,283,000 | $ 189,873,000 | $ 85,636,000 |
Repayments of secured debt |  |  |  |  |  |  |  |  | $ 6,000,000 |  |  |  |  |  |
Number of properties disposed | property |  |  |  |  |  |  |  |  |  |  |  |  |  | 18 |
Carrying value of mortgages assumed by buyer in real estate dispositions |  |  |  |  |  |  |  |  |  |  |  |  | $ 143,676,000 | $ 0 |
Number of loans sold |  | 1 |  |  |  |  |  |  |  |  |  |  | 5 |  | 3
Mortgage Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of assets classified as discontinued operations | property |  |  |  | 6 | 2 | 2 |  |  | 1 |  | 2 |  |  |  | 1
Repayments of secured debt |  |  |  |  | $ 64,000,000 | $ 39,000,000 |  |  |  |  |  |  |  |  |
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 (loss) on sales of real estate, net |  |  |  |  |  |  |  |  |  | 42,000,000 |  | 2,000,000 | $ 52,000,000 | 248,000,000 | $ 283,000,000
Discontinued Operations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on sales of real estate, net |  |  |  |  |  |  |  |  |  | $ 27,000,000 |  | (2,000,000) | 34,000,000 | 162,000,000 | $ 193,000,000
Brookedale MTCA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) 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] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital expenditure funding, amount committed |  |  | $ 56,000,000 |  |  |  |  | $ 92,000,000 |  |  |  |  |  |  |
Capital expenditure funding, amount funded |  |  |  |  |  |  |  |  |  |  |  |  | 400,000 |  |
Oakmont SHOP Portfolio |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Carrying value of mortgages assumed by buyer in real estate dispositions |  |  |  |  | $ 107,000,000 |  |  |  |  |  |  |  |  |  |
Oakmont SHOP Portfolio | Mortgage Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of properties disposed | property |  |  |  |  | 4 |  |  |  |  |  |  |  |  |  |
Other Dispositions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Carrying value of mortgages assumed by buyer in real estate dispositions |  |  |  |  | $ 36,000,000 |  |  |  |  |  |  |  |  |  |
Other Dispositions | Mortgage Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of properties disposed | property |  |  |  |  |  |  |  |  |  | 1 |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  | $ 12,000,000 |  |  | 24,000,000 | 385,000,000 | $ 428,000,000
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 (loss) 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 (loss) 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 (loss) on sales of real estate, net |  |  |  |  |  |  |  |  | $ 228,000,000 |  |  |  |  |  |
SHOP |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale of buildings |  |  |  |  |  |  |  | 230,000,000 |  | $ 120,000,000 |  | $ 12,000,000 |  | $ 76,000,000 | 190,000,000
Payments to acquire finance receivables |  |  |  |  |  |  |  | 150,000,000 |  |  |  |  |  |  |
Gain (loss) on sales of real estate, net |  |  |  |  |  |  |  | $ 59,000,000 |  |  | $ 16,000,000 |  |  |  |
SHOP | Oakmont SHOP Portfolio |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale of buildings |  |  |  |  | 564,000,000 |  |  |  |  |  |  |  |  |  |
Gain (loss) on sales of real estate, net |  |  |  |  | 80,000,000 |  |  |  |  |  |  |  |  |  |
SHOP | Discovery SHOP Portfolio |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale of buildings |  |  |  |  | 334,000,000 |  |  |  |  |  |  |  |  |  |
Gain (loss) on sales of real estate, net |  |  |  |  | 9,000,000 |  |  |  |  |  |  |  |  |  |
Proceeds from sale of loans and preferred equity method investments |  |  |  |  | 21,000,000 |  |  |  |  |  |  |  |  |  |
SHOP | Sonata SHOP Portfolio |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale of buildings |  |  |  |  | 64,000,000 |  |  |  |  |  |  |  |  |  |
Gain (loss) on sales of real estate, net |  |  |  |  | $ 3,000,000 |  |  |  |  |  |  |  |  |  |
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 (loss) on sales of real estate, net |  |  |  |  |  |  |  |  | $ 39,000,000 |  |  |  |  |  |
SHOP | Other Dispositions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale of buildings |  |  |  |  |  |  |  |  |  |  |  |  | $ 169,000,000 |  |
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 |  | 8 |  | 4 | 15 | 13 | 23
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 |  |  | 2 |  |  |  |  | 32 |  |  |  |  |  |  |
Proceeds from sale of buildings |  |  |  |  |  |  |  | $ 664,000,000 |  |  |  |  |  |  |
Payments to acquire finance receivables |  |  |  |  |  |  |  | $ 410,000,000 |  |  |  |  |  |  |
Gain (loss) on sales of real estate, net |  |  |  |  |  |  |  |  |  |  |  |  | $ 7,000,000 |  |
SHOP | Oakmont 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 |  |  |  |  |  |  |  |  |  |
SHOP | Discovery SHOP Portfolio |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of assets to be sold | property |  |  |  |  | 10 |  |  |  |  |  |  |  |  |  |
Gain (loss) on sales of real estate, net |  |  |  |  | $ 0 |  |  |  |  |  |  |  |  |  |
Number of preferred equity method investments sold | property |  |  |  |  | 2 |  |  |  |  |  |  |  |  |  |
SHOP | Discovery SHOP Portfolio | Secured Loans |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of loans sold | property |  |  |  |  | 2 |  |  |  |  |  |  |  |  |  |
SHOP | Sonata SHOP Portfolio |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of assets to be sold | property |  |  |  |  | 5 |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  |
Repayments of secured debt |  |  |  | $ 70,000,000 |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  | 113,000,000 |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on sales of real estate, net |  |  |  | $ 1,000,000 |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  | 4 |  |  |  |  |  |
Payments to acquire finance receivables |  |  |  |  |  |  |  |  | $ 61,000,000 |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  | 4 |  |  | 7 | 18 |
Senior housing triple-net | 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 |  |  | 2 |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale of buildings |  |  | $ 80,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on sales of real estate, net |  |  | $ 22,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Senior housing triple-net | Brookdale Triple Net Portfolio |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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, Hospital |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  | $ 226,000,000 |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on sales of real estate, net |  |  |  | $ 172,000,000 |  |  |  |  |  |  |  |  |  |  |
Medical office |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of assets to be sold | property |  |  |  |  |  |  |  |  |  | 3 |  | 4 | 7 | 7 | 11
Proceeds from sale of buildings |  |  |  |  |  |  |  |  |  | $ 36,000,000 |  | $ 14,000,000 | $ 57,000,000 | $ 120,000,000 |
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 | 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 |  |  |  |  |  |  |  |  |  |  |  | 1 |  | 1 | 2
Proceeds from sale of buildings |  |  |  |  |  |  |  |  |  |  |  | $ 2,000,000 |  | $ 2,000,000 |
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 |  | 1 | 1
Proceeds from sale of buildings |  |  |  |  |  |  |  |  |  |  |  | $ 1,000,000 |  | $ 1,000,000 | $ 1,000,000

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