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Real Estate - Acquired Properties From Unaffiliated Parties (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($) Property ApartmentUnit	Dec. 31, 2018 USD ($) Property ApartmentUnit
Properties acquired | Property	13	5
Property Units acquired | ApartmentUnit	3,540	1,478
Purchase Price	$ 1,514,521	$ 707,005
Rental Properties – Consolidated [Member]
Properties acquired | Property	13	5
Property Units acquired | ApartmentUnit	3,540	1,478
Purchase Price	$ 1,494,689	$ 707,005
Land Parcels [Member]
Purchase Price	$ 19,832

X

- Definition

Total number of property or properties acquired from unaffiliated third parties during the period.

+ References

No definition available.

+ Details

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Namespace Prefix:	eqr_
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Balance Type:	na
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X

- Definition

Total number of units associated with the property or properties acquired from unaffiliated third parties during the period.

+ References

No definition available.

+ Details

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Namespace Prefix:	eqr_
Data Type:	xbrli:integerItemType
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X

- Definition

Amount of assets acquired at the acquisition date.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=116869197&loc=d3e4845-128472

+ Details

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- Details

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X

- Details

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