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Leases - Summary of Residential Bad Debt for Company's Properties (Details) - Residential Leases [Member] - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Lessor Lease Description [Line Items] |  |  |  |
Bad debt, net | $ 3,979 | $ 16,071 | $ 29,751 | $ 29,419
% of rental income | 0.70% | 2.60% | 1.70% | 1.50%

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- Definition Operating lease lease income bad debt net. + References No definition available. + Details
Name: | eqr_OperatingLeaseLeaseIncomeBadDebtNet
Namespace Prefix: | eqr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Percentage of rental income. + References No definition available. + Details
Name: | eqr_PercentageOfRentalIncome
Namespace Prefix: | eqr_
Data Type: | dtr-types: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
Name: | us-gaap_LessorLeaseDescriptionLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_TypeOfArrangementAxis=eqr_ResidentialLeasesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |