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v3.23.1

Investments in Partially Owned Entities - Summary of Company's Consolidated Joint Ventures (Details) | Mar. 31, 2023 ApartmentUnit Property Project
--- | ---
Variable Interest Entity [Line Items] |
Properties | Property | 301
Apartment units | 79,351
Consolidated VIE [Member] | Operating Properties [Member] |
Variable Interest Entity [Line Items] |
Properties | Property | 15
Apartment units | 3,114
Consolidated VIE [Member] | Project Under Development [Member] |
Variable Interest Entity [Line Items] |
Apartment units | 312
Project | Project | 1

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

X
- Definition The number of real estate properties 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 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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Balance Type: | na
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X
- Details
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Namespace Prefix: |
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X
- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
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Namespace Prefix: |
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