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Individually Significant Dispositions - Additional Information (Details) | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015
Starwood Portfolio [Member] | Disposal Group, Not Discontinued Operations [Member] |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |
Percentage of consolidated NOI | 1.20% | 15.70%

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- Definition Represents the NOI for the disposition portfolio that is classified as an individually significant disposition as a percentage of NOI for the consolidated company. + References No definition available. + Details
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Namespace Prefix: | eqr_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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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
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Namespace Prefix: |
Data Type: | na
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- Details
Name: | us-gaap_DisposalGroupClassificationAxis=us-gaap_DisposalGroupNotDiscontinuedOperationsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |