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Dispositions of Real Estate and Discontinued Operations - Dispositions of Real Estate (Details) £ in Millions | 1 Months Ended | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Dec. 31, 2019 USD ($) | Nov. 30, 2019 property | Nov. 30, 2018 USD ($) | Aug. 31, 2018 GBP (£) | Jun. 30, 2018 USD ($) | Nov. 30, 2017 property | Jan. 31, 2017 USD ($) | Dec. 31, 2018 USD ($) property | Dec. 31, 2020 USD ($) property | Dec. 31, 2019 USD ($) property | Dec. 31, 2018 USD ($) property | Jun. 30, 2018 GBP (£)
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale of buildings |  |  |  |  |  |  |  |  | $ 0 | $ 0 | $ 335,709,000 |
Gain (loss) on sales of real estate, net |  |  |  |  |  |  |  |  | 90,350,000 | (40,000) | 831,368,000 |
Fair value of net assets | $ 14,032,891,000 |  |  |  |  |  |  |  | 15,920,089,000 | 14,032,891,000 |  |
U.K. Portfolio |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Noncontrolling interest (as a percent) |  |  |  |  | 49.00% |  |  |  |  |  |  | 49.00%
U.K. Portfolio |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on sales of real estate, net |  |  |  |  | $ 11,000,000 |  |  |  |  |  |  |
Interest sold | 49.00% |  |  |  | 51.00% |  |  |  |  |  |  |
Fair value of net assets |  |  |  |  | $ 507,000,000 |  |  |  |  |  |  | £ 382
Gross proceeds |  |  |  |  | 402,000,000 |  |  |  |  |  |  |
Foreign currency translation reclassified from OCI |  |  |  |  | $ 17,000,000 |  |  |  |  |  |  |
RIDEA II |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on sales of real estate, net |  |  |  |  |  |  | $ 99,000,000 |  |  |  |  |
Investment ownership percentage |  |  |  |  | 40.00% |  | 40.00% |  |  |  |  | 40.00%
HCP/CPA/Brookdale JV |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt provided |  |  |  |  |  |  | $ 602,000,000 |  |  |  |  |
Debt provided by third-party |  |  |  |  |  |  | 360,000,000 |  |  |  |  |
Debt provided by entity |  |  |  |  |  |  | 242,000,000 |  |  |  |  |
Net proceeds from the RIDEA II transaction |  |  |  |  |  |  | $ 480,000,000 |  |  |  |  |
HCP/CPA/Brookdale JV | RIDEA II |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt provided by entity |  |  |  |  | $ 242,000,000 |  |  |  |  |  |  |
Consideration receivable from sale of ownership interest |  |  |  |  | 91,000,000 |  |  |  |  |  |  |
Proceeds from sale of asset |  |  |  |  | $ 332,000,000 |  |  |  |  |  |  |
Shoreline Technology Center |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale of buildings |  |  | $ 1,000,000,000.0 |  |  |  |  |  |  |  |  |
Gain (loss) on sale of assets |  |  | $ 726,000,000 |  |  |  |  |  |  |  |  |
U.K. Portfolio |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Investments |  |  |  |  |  |  |  | $ 105,000,000 |  |  | 105,000,000 |
Maria Mallaband Care Group loan |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale of receivables | £ |  |  |  | £ 11 |  |  |  |  |  |  |  |
Senior Housing Operating Portfolio |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale of buildings |  |  |  |  |  |  |  |  | $ 190,000,000 | 181,000,000 | 394,000,000 |
Senior Housing Triple Net |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of assets to be sold | property |  |  |  |  |  |  |  |  | 21 |  |  |
Proceeds from sale of buildings |  |  |  |  |  |  |  |  | $ 428,000,000 | 26,000,000 | 35,000,000 |
Medical Office |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale of buildings |  |  |  |  |  |  |  |  | $ 136,000,000 | 28,000,000 | 25,000,000 |
Life Science |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale of buildings |  |  |  |  |  |  |  |  |  | 7,000,000 | 269,000,000 |
Undeveloped Life Science |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale of buildings |  |  |  |  |  |  |  |  |  | $ 35,000,000 | $ 3 |
Brookedale MTCA |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of assets to be sold | property |  |  |  |  |  |  |  | 19 |  |  |  |
Brookedale MTCA | Assets leased to others |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale of buildings |  |  |  |  |  |  |  | $ 377,000,000 |  |  |  |
Gain (loss) on sales of real estate, net |  |  |  |  |  |  |  | $ 40,000,000 |  |  |  |
Senior Housing Operating Portfolio |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of assets to be sold | property |  |  |  |  |  |  |  |  | 23 | 18 | 23 |
Senior Housing Operating Portfolio | Brookedale MTCA |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of assets to be sold | property |  |  |  |  |  |  |  | 8 |  |  |  |
Senior Housing Operating Portfolio | Brookedale MTCA | Assets leased to others |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of assets to be sold | property |  |  |  |  |  | 4 |  |  |  |  |  |
Senior Housing Triple Net |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of assets to be sold | property |  |  |  |  |  |  |  |  |  | 2 | 2 |
Senior Housing Triple Net | Assets leased to others |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of assets to be sold | property |  | 2 |  |  |  |  |  |  |  |  |  |
Senior Housing Triple Net | Brookedale MTCA | Assets leased to others |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of assets to be sold | property |  |  |  |  |  |  |  | 11 |  |  |  |
Medical Office |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of assets to be sold | property |  |  |  |  |  |  |  |  | 11 | 11 | 4 |
Life Science |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of assets to be sold | property |  |  |  |  |  |  |  |  |  | 1 | 4 |
Undeveloped Life Science |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of assets to be sold | property |  |  |  |  |  |  |  |  |  | 1 | 1 |
Non-Reportable Segment |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale of buildings |  |  |  |  |  |  |  |  |  | $ 15,000,000 |  |
Number of properties disposed | property |  |  |  |  |  |  |  |  |  | 1 |  |

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