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Debt - Other - Summary of Debt Extinguishment Costs Recorded as Additional Interest Expense (Details) - Other [Member] - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Extinguishment Of Debt [Line Items] |  |  |
Prepayment premiums/penalties |  | $ 26,150 | $ 13,647
Write-offs of unamortized deferred financing costs | $ 744 | 634 | 3,148
Write-offs of unamortized (premiums)/discounts/OCI |  | 12,508 | 7,196
Total | $ 744 | $ 39,292 | $ 23,991

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- Definition Prepayment premiums penalties. + References No definition available. + Details
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Namespace Prefix: | eqr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Amount of write off of unamortized discount premium net. + References No definition available. + Details
Name: | eqr_WriteoffOfUnamortizedDiscountPremiumNet
Namespace Prefix: | eqr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Gross amount of debt extinguished. + References No definition available. + Details
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Balance Type: | debit
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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
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Data Type: | xbrli:stringItemType
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- Definition Write-off of amounts previously capitalized as debt issuance cost in an extinguishment of debt. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.8) -URI http://asc.fasb.org/extlink&oid=123367319&loc=SL114868664-224227 + Details
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Balance Type: | debit
Period Type: | duration

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- Details
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