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Real Estate and Lease Intangibles - Real Estate Acquisitions and Dispositions (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2017 USD ($) Property ApartmentUnit
Disposed Properties | Property	1
Disposed Units | ApartmentUnit	304
Proceeds From Sale Of Land	$ 81,050
Consolidated Rental Properties [Member]
Disposed Properties | Property	1
Disposed Units | ApartmentUnit	304
Proceeds From Sale Of Land	$ 47,600
Land [Member]
Proceeds From Sale Of Land	$ 33,450

X

- Definition

The total number of rental properties that the Company disposed of to unaffiliated parties during the period.

+ References

No definition available.

+ Details

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

X

- Definition

Total number of rental units associated with rental properties that the company disposed of to unaffiliated third parties during the period.

+ References

No definition available.

+ Details

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

X

- Definition

The cash inflow from the sale of real estate investment property.

+ References

No definition available.

+ Details

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

X

- Details

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

X

- Details

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