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Leases - Summary of Right-of-Use Assets and Related Lease Liabilities (Parenthetical) (Details) | 3 Months Ended
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Mar. 31, 2019 CorporateOfficeLease
Corporate Office Leases [Member] |
Operating Leased Assets [Line Items] |
Number of short-term operating leases | 2

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- Definition Number of short-term operating leases. + References No definition available. + Details
Name: | eqr_NumberOfShortTermOperatingLeases
Namespace Prefix: | eqr_
Data Type: | xbrli:integerItemType
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
Name: | us-gaap_OperatingLeasedAssetsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=eqr_CorporateOfficeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |