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Real Estate - Acquired Properties From Unaffiliated Parties (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 USD ($) Property ApartmentUnit | Dec. 31, 2019 USD ($) Property ApartmentUnit
Properties acquired | Property | 1 | 13
Property Units acquired | ApartmentUnit | 158 | 3,540
Purchase Price | $ 48,860 | $ 1,514,521
Rental Properties – Consolidated [Member] |  |
Properties acquired | Property | 1 | 13
Property Units acquired | ApartmentUnit | 158 | 3,540
Purchase Price | $ 48,860 | $ 1,494,689
Land Parcels [Member] |  |
Purchase Price |  | $ 19,832

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- Definition Total number of property or properties acquired from unaffiliated third parties during the period. + References No definition available. + Details
Name: | eqr_PropertiesAcquired
Namespace Prefix: | eqr_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition Total number of units associated with the property or properties acquired from unaffiliated third parties during the period. + References No definition available. + Details
Name: | eqr_PropertyUnitsAcquired
Namespace Prefix: | eqr_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of assets acquired at the acquisition date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=121647850&loc=d3e4845-128472 + Details
Name: | us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=eqr_ConsolidatedRentalPropertiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=eqr_LandParcelsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |