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Summary of Significant Accounting Policies - Narrative (Details) |  |  | 12 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jan. 31, 2020 USD ($) facility property | Jan. 01, 2018 USD ($) | Dec. 31, 2020 USD ($) property | Dec. 31, 2019 USD ($) facility | Dec. 31, 2018 USD ($) | Mar. 31, 2020 property | Jan. 01, 2020 USD ($) | Oct. 31, 2019 property | Jan. 01, 2019 USD ($) | Dec. 31, 2017 USD ($) | Jan. 31, 2017
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Residency agreement term, minimum |  |  | 30 days |  |  |  |  |  |  |  |  |  |  |
Residency agreement term, maximum |  |  | 1 year |  |  |  |  |  |  |  |  |  |  |
Maximum period available for occupancy from cessation of significant construction activity |  |  | 1 year |  |  |  |  |  |  |  |  |  |  |
Maximum useful life of building and improvements |  |  | 60 years |  |  |  |  |  |  |  |  |  |  |
Advertising expense |  |  | $ 18,000,000 | $ 13,000,000 |  | $ 9,000,000 |  |  |  |  |  |  |  |
Property count | property | 15 |  |  |  |  |  |  |  |  |  |  |  |  |
HCP’s capital |  |  | 6,788,345,000 | 6,085,058,000 |  |  |  |  |  |  |  |  |  |
Cumulative effect of new accounting principle |  |  | 7,344,572,000 | 6,667,474,000 |  | 6,512,591,000 |  |  |  |  |  | $ 5,594,938,000 |  |
Present value of lease liability |  |  | 179,895,000 | 152,400,000 |  |  |  |  |  |  |  |  |  |
Right-of-use asset, net |  |  | 192,349,000 | 167,316,000 |  |  |  |  |  |  |  |  |  |
Intangible assets, net |  |  | 519,917,000 | $ 260,204,000 |  |  |  |  |  |  |  |  |  |
Other Non-Reporting Segment |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of deconsolidating assets | facility |  |  |  | 19 |  |  |  |  |  |  |  |  |  |
Assets leased to others | Other Non-Reporting Segment |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property count | property |  |  |  |  |  |  |  | 1 |  |  |  |  |  |
CCRC JV Investment | CCRC |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property count | facility | 15 |  |  |  |  |  |  |  |  |  |  |  |  |
CCRC JV Investment | Assets leased to others | Other Non-Reporting Segment |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property count | property |  |  |  |  |  |  |  | 15 |  | 15 |  |  |  |
Brookedale MTCA | Assets leased to others | Other Non-Reporting Segment |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property count | property | 13 |  |  |  |  |  |  |  |  |  |  |  |  |
Brookedale MTCA | CCRC JV Investment |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Non refundable entrance fee liabilities | $ 436,000,000 |  | $ 484,000,000 | $ 68,000,000 |  |  |  |  |  |  |  |  |  |
Property count | property | 15 |  |  |  |  |  |  |  |  |  |  |  |  |
Equity method investments | $ 323,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Brookedale MTCA | CCRC JV Investment | CCRC |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property count | facility | 13 |  |  |  |  |  |  |  |  |  |  |  |  |
Brookedale MTCA | CCRC JV Investment | Assets leased to others | Other Non-Reporting Segment |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property count | property | 13 |  | 13 |  |  |  |  | 13 |  |  |  |  |  |
Discontinued Operations |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Advertising expense |  |  | $ 12,000,000 | 13,000,000 |  | 9,000,000 |  |  |  |  |  |  |  |
RIDEA II |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment ownership percentage |  |  |  |  |  |  |  |  |  |  |  |  |  | 40.00%
Equity method investments |  | $ 121,000,000 |  |  |  |  |  |  |  |  |  |  |  |
ASU 2016-02 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Present value of lease liability |  |  |  |  |  |  |  |  |  |  | $ 153,000,000 |  |  |
Right-of-use asset, net |  |  |  |  |  |  |  |  |  |  | 166,000,000 |  |  |
Accrued Rent |  |  |  |  |  |  |  |  |  |  | 20,000,000 |  |  |
Intangible assets, net |  |  |  |  |  |  |  |  |  |  | 33,000,000 |  |  |
Difference between Revenue Guidance in Effect before and after Topic 606 | ASU 2014-09 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
HCP’s capital |  | 79,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Cumulative effect of change on beginning retained earnings |  | 30,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Difference between Revenue Guidance in Effect before and after Topic 606 | ASU 2014-09 | RIDEA II |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of equity investment |  | $ 107,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Cumulative Dividends In Excess Of Earnings |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cumulative effect of new accounting principle |  |  | $ (3,976,232,000) | (3,601,199,000) |  | (2,927,196,000) |  |  |  |  |  | (3,370,520,000) |  |
Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cumulative effect of new accounting principle |  |  |  | (1,524,000) | [1] | 590,000 | [2] |  | $ 2 |  |  | 79,144,000 | [3] |
Cumulative Effect, Period of Adoption, Adjustment | Cumulative Dividends In Excess Of Earnings |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cumulative effect of new accounting principle |  |  |  | $ (1,524,000) | [1] | $ 590,000 | [2] |  |  |  |  | $ 79,144,000 | [3] |
Cumulative Effect, Period of Adoption, Adjustment | Cumulative Dividends In Excess Of Earnings | ASU 2016-02 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cumulative effect of new accounting principle |  |  |  |  |  |  |  |  |  |  | $ 1,000,000 |  |  |
[1] | On January 1, 2020, the Company adopted a series of ASUs related to accounting for credit losses and recognized the cumulative-effect of adoption to beginning retained earnings. Refer to Note 2 for a detailed impact of adoption.
[2] | On January 1, 2019, the Company adopted a series of ASUs related to accounting for leases, and recognized the cumulative-effect of adoption to beginning retained earnings. Refer to Note 2 for a detailed impact of adoption.
[3] | On January 1, 2018, the Company adopted Accounting Standards Update (“ASU”) No. 2017-05, Clarifying the Scope of Asset Derecognition Guidance and Accounting for Partial Sales of Nonfinancial Assets (“ASU 2017-05”), and recognized the cumulative-effect of adoption to beginning retained earnings. Refer to Note 2 for a detailed impact of adoption.

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http://asc.fasb.org/extlink&oid=115929471&loc=d3e21914-107793 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section 50 -Paragraph 7 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109234566&loc=d3e22644-107794 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 10 -Section 65 -Paragraph 4 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=121646688&loc=SL121648383-210437 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 65 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=121370832&loc=SL117420844-207641 Reference 8: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=108774443&loc=SL4568740-111683 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 65 -Paragraph 15 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=121322162&loc=SL121327923-165333 Reference 10: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 55 -Paragraph 4I -URI http://asc.fasb.org/extlink&oid=120409616&loc=SL4590271-111686 Reference 11: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 65 -Paragraph 2 -Subparagraph (f)(1) -URI http://asc.fasb.org/extlink&oid=121370832&loc=SL117420844-207641 Reference 12: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 28 -Subparagraph (f) -URI 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