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Equity, Capital and Other Interests - Changes in Redemption Value of Redeemable Limited Partners Interest (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Equity Capital And Other Interests [Abstract] |  |  |
Redeemable Limited Partners | $ 463,400 | $ 379,106 | $ 366,955
Limited Partners Change In Redemption Value | (125,224) | 82,283 | 13,922
Limited Partners Change In Carrying Value | 775 | 2,011 | (1,771)
Redeemable Limited Partners | $ 338,951 | $ 463,400 | $ 379,106

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- Definition Represents the Equity of the Parent Company and the Capital of the Operating Partnership as well as the interests of Partially Owned and Limited Partners. + References No definition available. + Details
Name: | eqr_EquityCapitalAndOtherInterestsAbstract
Namespace Prefix: | eqr_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Represents the change in the proportional relationship between the carrying values of capital associated with general partner units relative to that of the Limited Partners. + References No definition available. + Details
Name: | eqr_LimitedPartnersChangeInCarryingValue
Namespace Prefix: | eqr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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- Definition Change in the value of Redeemable Limited Partners Units as a result of changes in the fair value of the company's common shares during the period. + References No definition available. + Details
Name: | eqr_LimitedPartnersChangeInRedemptionValue
Namespace Prefix: | eqr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition The greater of carrying value (book value) or fair market value of an entity's issued and outstanding Units which is not included within Partner's Capital in Capital. Represents a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable. Includes any type of security that is redeemable at a fixed or determinable price or on a fixed or determinable date or dates, is redeemable at the option of the holder, or has conditions for redemption which are not solely within the control of the issuer. If convertible, the issuer does not control the actions or events necessary to issue the maximum number of shares that could be required to be delivered under the conversion option if the holder exercises the option to convert the units to another class of equity. + References No definition available. + Details
Name: | eqr_RedeemableLimitedPartners
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Balance Type: | credit
Period Type: | instant