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Dispositions of Real Estate and Discontinued Operations - 2021 Dispositions of Real Estate (Details) | 1 Months Ended | 3 Months Ended | 12 Months Ended
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Jan. 31, 2022 USD ($) property | Sep. 30, 2021 loan | Jun. 30, 2021 USD ($) property | May 31, 2021 USD ($) property | Apr. 30, 2021 USD ($) property preferred_equity_investment | Mar. 31, 2021 USD ($) property | Feb. 28, 2021 USD ($) property | Jan. 31, 2021 USD ($) property | Dec. 31, 2020 USD ($) property | Mar. 31, 2021 USD ($) property | Dec. 31, 2021 USD ($) property loan | Dec. 31, 2020 USD ($) property loan | Dec. 31, 2019 USD ($) property
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on sales of real estate, net |  |  |  |  |  |  |  |  |  |  | $ 190,590,000 | $ 90,350,000 | $ (40,000)
Number of assets classified as discontinued operations | property |  |  |  |  |  |  |  |  | 1 |  |  | 1 |
Repayments of secured debt |  |  |  |  |  |  |  |  | $ 6,000,000 |  |  |  |
Carrying value of mortgages assumed by buyer in real estate dispositions |  |  |  |  |  |  |  |  |  |  | $ 143,676,000 | $ 0 | 0
Number of loans sold | loan |  |  |  |  |  |  |  |  |  |  | 6 | 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 |  |  |  | 2 |  |  |
Repayments of secured debt |  |  |  |  | $ 64,000,000 | $ 39,000,000 |  |  |  |  |  |  |
Mezzanine |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of loans sold | loan |  | 1 |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  |  |  | 30,000,000
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 |  |  |  |  |  |  |  |  |  |  |  |  | 23,000,000
Sunrise Senior Housing Portfolio | Senior Housing Operating Portfolio |  |  |  |  |  |  |  |  |  |  |  |  |
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 Investments | Mortgage Debt |  |  |  |  |  |  |  |  |  |  |  |  |
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 Investments | 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 |  |  |  |  |  |  |  |  |  |  | 58,000,000 | $ 283,000,000 |
Other Investments | 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 |  |  |  |  |  |  |  |  |  |  | 39,000,000 | 193,000,000 |
Senior Housing Operating Portfolio |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale of buildings |  |  |  |  |  |  |  | 230,000,000 |  |  |  |  | 181,000,000
Payments to acquire finance receivables |  |  |  |  |  |  |  | 150,000,000 |  |  |  |  |
Gain (loss) on sales of real estate, net |  |  |  |  |  |  |  | 59,000,000 |  | $ 16,000,000 |  |  |
Senior Housing Operating Portfolio | 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 |  |  |  |  |  |  |  |
Senior Housing Operating Portfolio | 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 |  |  |  |  |  |  |  |
Senior Housing Operating Portfolio | 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 |  |  |  |  |  |  |  |
Senior Housing Operating Portfolio | Other Investments |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale of buildings |  |  |  |  |  |  |  |  |  |  | 169,000,000 | $ 190,000,000 |
Senior Housing Triple Net |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale of buildings |  |  |  |  |  |  |  |  |  |  |  |  | $ 26,000,000
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 | Other Investments |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of assets sold | property |  |  |  |  |  |  |  |  |  |  |  | 21 |
Proceeds from sale of buildings |  |  |  |  |  |  |  |  |  |  | 24,000,000 | $ 428,000,000 |
Senior Housing Operating Portfolio |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of assets sold | property |  |  |  |  |  |  |  | 16 |  |  |  |  | 18
Senior Housing Operating Portfolio | Sunrise Senior Housing Portfolio |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of assets 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 |  |
Senior Housing Operating Portfolio | Oakmont SHOP Portfolio |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of assets sold | property |  |  |  |  | 12 |  |  |  |  |  |  |  |
Senior Housing Operating Portfolio | Discovery SHOP Portfolio |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of assets sold | property |  |  |  |  | 10 |  |  |  |  |  |  |  |
Gain (loss) on sales of real estate, net |  |  |  |  | $ 0 |  |  |  |  |  |  |  |
Number of preferred equity method investments sold | preferred_equity_investment |  |  |  |  | 2 |  |  |  |  |  |  |  |
Senior Housing Operating Portfolio | Discovery SHOP Portfolio | Mezzanine |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of loans sold | property |  |  |  |  | 2 |  |  |  |  |  |  |  |
Senior Housing Operating Portfolio | Sonata SHOP Portfolio |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of assets sold | property |  |  |  |  | 5 |  |  |  |  |  |  |  |
Senior Housing Operating Portfolio | SLC SHOP Portfolio |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of assets sold | property |  |  |  | 7 |  |  |  |  |  |  |  |  |
Repayments of secured debt |  |  |  | $ 70,000,000 |  |  |  |  |  |  |  |  |
Senior Housing Operating Portfolio | 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 |  |  |  |  |  |  |  |  |
Senior Housing Operating Portfolio | Other Investments |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of assets sold | property |  |  |  |  |  |  |  |  |  |  | 15 | 23 |
Senior Housing Operating Portfolio | Other Investments | Mortgage Debt |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of assets sold | property |  |  |  |  |  |  |  |  |  |  | 1 |  |
Senior Housing Triple Net |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of assets sold | property |  |  |  |  |  |  |  |  |  |  |  |  | 2
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 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 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 sold | property |  |  |  |  |  |  | 8 |  |  |  |  |  |
Senior Housing Triple Net | Other Investments |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of assets sold | property |  |  |  |  |  |  |  |  |  |  | 7 |  |
Medical Office, Hospital |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of assets 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 sold | property |  |  |  |  |  |  |  |  |  |  |  |  | 11
Medical Office | Other Investments |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of assets sold | property |  |  |  |  |  |  |  |  |  |  | 10 | 11 |
Proceeds from sale of buildings |  |  |  |  |  |  |  |  |  |  | $ 68,000,000 |  |
MOB Land Parcels | Other Investments |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of assets sold | property |  |  |  |  |  |  |  |  |  |  | 1 | 2 |
Life science | Other Investments | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of assets sold | property | 1 |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale of buildings | $ 14,000,000 |  |  |  |  |  |  |  |  |  |  |  |

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