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v3.19.3.a.u2

Leases - Summary of the Effect of the Amortization for Ground Lease Intangibles (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Property and Maintenance [Member] |  |  |
Ground lease intangible amortization | $ (4,463) | $ (4,463) | $ (4,369)

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- Definition Ground lease intangible amortization. + References No definition available. + Details
Name: | eqr_GroundLeaseIntangibleAmortization
Namespace Prefix: | eqr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
Name: | us-gaap_IncomeStatementLocationAxis=eqr_PropertyAndMaintenanceMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |