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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