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Commitments to Acquire/Dispose of Real Estate - Separate Agreements to Acquire (Details) - Subsequent Event [Member] $ in Thousands | Feb. 16, 2018 USD ($) Property ApartmentUnit
--- | ---
Property/Unit schedule |
Properties | Property | 1
Apartment Units | ApartmentUnit | 117
Purchase Price | $ | $ 53,700
Rental Properties Acquired [Member] |
Property/Unit schedule |
Properties | Property | 1
Apartment Units | ApartmentUnit | 117
Purchase Price | $ | $ 53,700

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: |