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Variable Interest Entities - Narrative (Details) $ in Thousands, £ in Millions	1 Months Ended	3 Months Ended		12 Months Ended
	Jul. 31, 2020 property	Mar. 31, 2018 USD ($)	Mar. 31, 2018 GBP (£)	Dec. 31, 2020 USD ($) joint_venture tenant asset entity property	Dec. 31, 2019 USD ($)	Dec. 31, 2016 USD ($) property	Jan. 31, 2020 property	Mar. 31, 2018 GBP (£)	Dec. 31, 2016 GBP (£) property
Variable Interest Entity [Line Items]
Number of unconsolidated joint ventures				3
Term of facility				1 month	1 month
Carrying value of exchange accommodation titleholder, carrying value | $				$ 813,000
Loans receivable including loans receivable held for sale | $				195,375	$ 190,579
Fair value of net assets | $				15,920,089	14,032,891
Net deferred tax liabilities | $				$ 8,575,517	$ 7,365,417
Property count							15
VIE Tenants-Operating Leases
Variable Interest Entity [Line Items]
Number of properties leased				2
Number of unconsolidated joint ventures | joint_venture				4
Number of VIE borrowers with marketable debt securities | joint_venture				1
Number of VIE borrowers with debt securities and loan | joint_venture				1
Number of VIE tenants | tenant				1
Unconsolidated joint ventures
Variable Interest Entity [Line Items]
Ownership percentage				49.00%
HCP Ventures V
Variable Interest Entity [Line Items]
Ownership percentage				51.00%
Life Science JVs
Variable Interest Entity [Line Items]
Number of unconsolidated joint ventures				1
Ownership percentage				99.00%
MSREI MOB JV
Variable Interest Entity [Line Items]
Ownership percentage				51.00%
DownREIT Partnerships
Variable Interest Entity [Line Items]
Controlling interest entity controlling ownership interest | entity				7
Consolidated Lessees
Variable Interest Entity [Line Items]
Number of properties leased				7
MMCG
Variable Interest Entity [Line Items]
Loans receivable including loans receivable held for sale						$ 131,000			£ 105
Number of properties						7			7
Period of call-option retained						3 years
Loss on consolidation		$ 41,000	£ 29
Tax benefit		3,000	£ 2
Fair value of net assets		5,000						£ 4
Net deferred tax liabilities		13,000						9
Property, Plant and Equipment | MMCG
Variable Interest Entity [Line Items]
Fair value of net assets		$ 114,000						£ 81
Other Non-Reporting Segment | Development Investment
Variable Interest Entity [Line Items]
Property count				2
Senior Housing Triple Net | Loan-seller Financing
Variable Interest Entity [Line Items]
Number of VIE tenants | tenant				7
Loans receivable | $				$ 10,000
Term of facility				5 years
Medical Office
Variable Interest Entity [Line Items]
Number of properties acquired	1			7
Hospital
Variable Interest Entity [Line Items]
Number of properties acquired | asset				1
Life Science
Variable Interest Entity [Line Items]
Number of properties acquired | asset				3

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