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Leases - Summary of Residential and Non-Residential Accounts Receivable and Straight-Line Receivable Balances (Parenthetical) (Details) | Mar. 31, 2021
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Leases [Abstract] |
Holding percentage of residential security deposits of net receivable | 35.40%

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- Definition Holding percentage of residential security deposits of net receivable. + References No definition available. + Details
Name: | eqr_HoldingPercentageOfResidentialSecurityDepositsOfNetReceivables
Namespace Prefix: | eqr_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- References No definition available. + Details
Name: | us-gaap_LeasesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration