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Reportable Segments - Schedule of Reconciliation of Operating Expenses (Parethetical) (Details) - Property	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Segment Reporting, Disclosure of Entity's Reportable Segments [Abstract]
Units in same store properties	75,473	75,473	74,595	74,595

X

- Definition

Total number of units associated with properties acquired or completed and stabilized two or more fiscal years ago, less properties subsequently sold.

+ References

No definition available.

+ Details

Name:	eqr_NumberOfUnitsInSameStoreProperties
Namespace Prefix:	eqr_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

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