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Real Estate - Acquired Properties from Unaffiliated Parties (Parenthetical) (Details)	Sep. 30, 2024 Property
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

X

- Details

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