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Commitments to Acquire/Dispose of Real Estate - Summary of Agreement to Acquire (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2022 USD ($) Property Apartment
Properties | Property | 1
Apartment Units | Apartment | 262
Purchase Price | $ | $ 78,600
Rental Properties – Consolidated [Member] |
Properties | Property | 1
Apartment Units | Apartment | 262
Purchase Price | $ | $ 78,600

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- Definition Properties agreed to be acquired. + References No definition available. + Details
Name: | eqr_PropertiesAgreedToAcquired
Namespace Prefix: | eqr_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition Property units agreed to be acquired. + References No definition available. + Details
Name: | eqr_PropertyUnitsAgreedToBeAcquired
Namespace Prefix: | eqr_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition Real estate commitments to acquire purchase price. + References No definition available. + Details
Name: | eqr_RealEstateCommitmentsToAcquirePurchasePrice
Namespace Prefix: | eqr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=eqr_ConsolidatedRentalPropertiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |