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Investments in Partially Owned Entities - Summary of Company's Unconsolidated Joint Ventures Deemed to be VIEs (Details) | Sep. 30, 2022 Project ApartmentUnit Entity
--- | ---
Variable Interest Entity [Line Items] |
Apartment units | 79,594
Variable Interest Entity, Not Primary Beneficiary | Real Estate Holdings [Member] |
Variable Interest Entity [Line Items] |
Entities | Entity | 2
Variable Interest Entity, Not Primary Beneficiary | Projects Under Development [Member] |
Variable Interest Entity [Line Items] |
Project | Project | 6
Apartment units | 1,982
Variable Interest Entity, Not Primary Beneficiary | Land Held For Development [Member] |
Variable Interest Entity [Line Items] |
Project | Project | 2
Apartment units | 745

X
- Definition Number of entity. + References No definition available. + Details
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Namespace Prefix: | eqr_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number of projects. + References No definition available. + Details
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Namespace Prefix: | eqr_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition The number of units in a real estate property owned as of the balance sheet date. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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
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- Details
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Namespace Prefix: |
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- Details
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- Details
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- Details
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Balance Type: |
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