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Reportable Segments - Schedule of Reconciliation of Total Assets and Capital Expenditures (Parenthetical) (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