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Real Estate - Acquired Properties from Unaffiliated Parties (Parenthetical) (Details) | Sep. 30, 2024 Property
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Rental Properties - Consolidated [Member] |
Number of properties subject to fully prepaid below market long-term ground and parking leases | 1

X
- Definition Number of properties subject to fully prepaid below market long term ground and parking leases. + References No definition available. + Details
Name: | eqr_NumberOfPropertiesSubjectToFullyPrepaidBelowMarketLongTermGroundAndParkingLeases
Namespace Prefix: | eqr_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=eqr_ConsolidatedRentalPropertiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |