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Commitments to Acquire/Dispose of Real Estate - Separate Agreements to Dispose of (Parenthetical) (Details)	Jul. 28, 2017 Land
Subsequent Event [Member] | Land [Member]
Property/Unit schedule
Land Parcels	2

X

- Definition

Total number of land parcels to be disposed subsequent to the balance sheet date per separate agreements entered into prior to the balance sheet date.

+ References

No definition available.

+ Details

Name:	eqr_LandParcelsContractedToBeDisposed
Namespace Prefix:	eqr_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_RealEstatePropertiesLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
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: