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Debt - Other - Summary of Debt Extinguishment Costs Recorded as Additional Interest Expense (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2022 | Sep. 30, 2022 | Sep. 30, 2021
Debt Disclosure [Abstract] |  |  |
Write-offs of unamortized deferred financing costs | $ 277 | $ 369 | $ 264
Write-offs of unamortized (premiums)/discounts/OCI | 3,570 | 3,947 |
Total | $ 3,847 | $ 4,316 | $ 264

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- Definition Amount of write off of unamortized discount premium net. + 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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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
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- Definition Gross amount of debt extinguished. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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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 https://asc.fasb.org/extlink&oid=126953954&loc=SL114868664-224227 + Details
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