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Employee Plans - Summary of Information Regarding the Common Shares Issued Under the ESPP (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Share-Based Payment Arrangement, Additional Disclosure [Abstract] |  |  |
Shares issued | 66,835 | 70,702 | 90,196
Issuance price ranges, Minimum | $ 52.33 | $ 53.13 | $ 46.23
Issuance price ranges, Maximum | $ 72.51 | $ 71.04 | $ 63.84
Issuance proceeds | $ 4,178 | $ 4,265 | $ 4,508

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- Definition Represents the maximum price that employees purchase common stock for under the employee purchase plan during the year. + References No definition available. + Details
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- Definition Represents the minimum price that employees purchase common stock for under the employee purchase plan during the year. + References No definition available. + Details
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Namespace Prefix: | eqr_
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Balance Type: | na
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- References No definition available. + Details
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- Definition Amount of cash inflow from issuance of shares under share-based payment arrangement. Excludes option exercised. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3255-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2A -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=128089324&loc=SL79508275-113901 + Details
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- Definition Number of shares issued under share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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