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Commitments to Acquire/Dispose of Real Estate - Separate Agreements to Acquire (Details) - Subsequent Event [Member] $ in Thousands	Apr. 28, 2017 USD ($) Property ApartmentUnit
Property/Unit schedule
Properties | Property	1
Apartment Units | ApartmentUnit	136
Purchase Price | $	$ 57,028
Rental Properties to be Acquired [Member]
Property/Unit schedule
Properties | Property	1
Apartment Units | ApartmentUnit	136
Purchase Price | $	$ 57,028

X

- Definition

Properties contracted to be acquired.

+ References

No definition available.

+ Details

Name:	eqr_PropertiesContractedToBeAcquired
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 to be acquired from unaffiliated third parties.

+ References

No definition available.

+ Details

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

X

- Definition

Purchase price for commitments to acquire

+ References

No definition available.

+ Details

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

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_RealEstatePropertiesAxis=eqr_RentalPropertiesToBeAcquiredMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: