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Investments in Partially Owned Entities - Consolidated Variable Interest Entities ("VIEs") - Additional Information (Details) | Dec. 31, 2021 JointVenture
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Toll Brothers, Inc. (“Toll”) |
Variable Interest Entity [Line Items] |
Number of separate joint venture agreements under the commitment agreement | 3

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- Definition Number of separate joint venture agreements under the commitment agreement. + References No definition available. + Details
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Namespace Prefix: | eqr_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- 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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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | srt_ConsolidatedEntitiesAxis=eqr_TollBrothersIncMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |