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v3.19.2

Commitments to Acquire/Dispose of Real Estate - Agreement to Acquire (Details) $ in Thousands | 6 Months Ended
--- | ---
Jun. 30, 2019 USD ($) Property ApartmentUnit
Property/Unit schedule |
Properties | Property | 1
Apartment Units | ApartmentUnit | 398
Purchase Price | $ | $ 189,000
Rental Properties Acquire [Member] | Consolidated [Member] |
Property/Unit schedule |
Properties | Property | 1
Apartment Units | ApartmentUnit | 398
Purchase Price | $ | $ 189,000

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_BusinessAcquisitionAxis=eqr_RentalPropertiesAcquireMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RealEstatePropertiesAxis=us-gaap_ConsolidatedPropertiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |