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Schedule III - Real Estate and Accumulated Depreciation - Summary of Changes in Real Estate (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Changes in total real estate
Balance, beginning of year	$ 28,712,638	$ 28,088,754	$ 28,272,906
Acquisitions and development	1,717,217	500,221	214,903
Improvements	304,200	321,082	225,136
Dispositions and other	(763,264)	(197,419)	(624,191)
Balance, end of year	$ 29,970,791	$ 28,712,638	$ 28,088,754

X

- Definition

Gross amount at which new acquisitions and development properties are carried at the end of the period.

+ References

No definition available.

+ Details

Name:	eqr_RealEstateAcquisitionsAndDevelopment
Namespace Prefix:	eqr_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Gross amount at which dispositions are removed from the balance sheet for properties sold during the year.

+ References

No definition available.

+ Details

Name:	eqr_RealEstateDispositionsAndOther
Namespace Prefix:	eqr_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Amount, before accumulated depreciation, of real estate investment by entity with substantial portion of business acquiring and holding investment real estate or interest in real estate. Excludes real estate not held as investment or interest.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 970
-SubTopic 360
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.12-28(Column E))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478979/970-360-S99-1

+ Details

Name:	us-gaap_RealEstateGrossAtCarryingValue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Amount of increase in real estate investments related to improvements for entities with a substantial portion of business acquiring and holding investment real estate.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 970
-SubTopic 360
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.12-28(Column E)(Footnote 4))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478979/970-360-S99-1

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

+ Details

Name:	us-gaap_ReconciliationOfCarryingAmountOfRealEstateInvestmentsRollForward
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration