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Real Estate - Acquired Properties from Unaffiliated Parties (Details) - Rental Properties - Consolidated [Member] $ in Thousands | 6 Months Ended
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Jun. 30, 2024 USD ($) ApartmentUnit Property
Properties acquired | Property | 1
Property Units acquired | ApartmentUnit | 160
Purchase Price | $ 62,595
Land | 6,593
Depreciable Property | $ 56,077

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- Definition Business combination recognized identifiable assets acquired and liabilities assumed depreciable property. + References No definition available. + Details
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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
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Namespace Prefix: | eqr_
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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
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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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- 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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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |