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Schedule III - Real Estate and Accumulated Depreciation - Summary of Changes in Accumulated Depreciation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Changes in accumulated depreciation
Balance, beginning of year	$ 9,810,337	$ 9,027,850	$ 8,354,282
Depreciation	952,191	888,709	882,168
Dispositions and other	(350,065)	(106,222)	(208,600)
Balance, end of year	$ 10,412,463	$ 9,810,337	$ 9,027,850

X

- Definition

The amount of depreciation expense related to dispositions that has been reclassified to discontinued operations.

+ References

No definition available.

+ Details

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

X

- Definition

Amount of accumulated depreciation pertaining to real estate investments 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 F))
-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:	credit
Period Type:	instant

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

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
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X

- Definition

Amount of depreciation expense of real estate investments 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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