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Real Estate - Acquired Properties From Unaffiliated Parties (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2023 USD ($) Property ApartmentUnit | Dec. 31, 2022 USD ($) Property ApartmentUnit
Properties | Property | 4 | 1
Apartment Units | ApartmentUnit | 1,183 | 172
Purchase Price | $ 366,334 | $ 113,000
Land | 41,142 | 25,361
Depreciable Property | $ 325,611 | $ 87,685
Rental Properties – Consolidated [Member] |  |
Properties | Property | 4 | 1
Apartment Units | ApartmentUnit | 1,183 | 172
Purchase Price | $ 366,334 | $ 113,000
Land | 41,142 | 25,361
Depreciable Property | $ 325,611 | $ 87,685

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- Definition Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Depreciable Property + References No definition available. + Details
Name: | eqr_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDepreciableProperty
Namespace Prefix: | eqr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Total number of property or properties acquired from unaffiliated third parties during the period. + References No definition available. + Details
Name: | eqr_PropertiesAcquired
Namespace Prefix: | eqr_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition Total number of units associated with the property or properties acquired from unaffiliated third parties during the period. + References No definition available. + Details
Name: | eqr_PropertyUnitsAcquired
Namespace Prefix: | eqr_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of assets acquired at the acquisition date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479907/805-20-50-1 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Amount of real estate acquired, at the acquisition date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479907/805-20-50-1 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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