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Real Estate and Lease Intangibles - Real Estate Acquisitions and Dispositions (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2018 USD ($) Property ApartmentUnit	Dec. 31, 2017 USD ($) Property ApartmentUnit
Properties acquired | Property	5	4
Property Units acquired | ApartmentUnit	1,478	947
Purchase Price	$ 707,005	$ 468,050
Properties disposed | Property	5	5
Property Units disposed | ApartmentUnit	1,292	1,194
Sales Price	$ 708,820	$ 388,400
Rental Properties – Consolidated [Member]
Properties acquired | Property	5	4
Property Units acquired | ApartmentUnit	1,478	947
Purchase Price	$ 707,005	$ 468,050
Properties disposed | Property	5	5
Property Units disposed | ApartmentUnit	1,292	1,194
Sales Price	$ 706,120	$ 354,950
Land [Member]
Purchase Price	$ 113,700	$ 68,300
Properties disposed | Property	0	0
Property Units disposed | ApartmentUnit	0	0
Sales Price	$ 2,700	$ 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

- Definition

Total number of property or properties acquired from unaffiliated third parties during the period.

+ References

No definition available.

+ Details

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

X

- Definition

Total number of units associated with the property or properties acquired from unaffiliated third parties during the period.

+ References

No definition available.

+ Details

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

X

- Definition

Amount of assets acquired at the acquisition date.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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: