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Leases - Summary of Residential and Non-Residential Accounts Receivable and Straight-Line Receivable Balances (Parenthetical) (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2023 USD ($)
Leases [Abstract] |
Non-cash write-off of straight-line receivables | $ 1.5

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- Definition Write off of straight line receivables. + References No definition available. + Details
Name: | eqr_WriteOffOfStraightLineReceivables
Namespace Prefix: | eqr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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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