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Subsequent Events - Acquired Properties From Unaffiliated Parties (Details) - Rental Properties - Consolidated [Member] $ in Thousands		9 Months Ended
	Oct. 01, 2024 USD ($) ApartmentUnit Property	Sep. 30, 2024 USD ($) Property ApartmentUnit
Subsequent Event [Line Items]
Properties | Property		15
Apartment Units | ApartmentUnit		4,578
Purchase Price | $		$ 1,317,845
Subsequent Events [Member]
Subsequent Event [Line Items]
Properties | Property	1
Apartment Units | ApartmentUnit	274
Purchase Price | $	$ 89,500

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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X

- Definition

Amount of assets acquired at the acquisition date.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 805
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479907/805-20-50-1

+ Details

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Balance Type:	debit
Period Type:	instant

X

- Definition

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 830
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481674/830-30-50-2

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 855
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483399/855-10-50-2

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- Details

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- Details

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