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v3.25.3

Real Estate - Additional Information (Details) $ in Millions | 9 Months Ended
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Sep. 30, 2025 USD ($) ApartmentUnit
Percentage interest in consolidated operating property | 10.00%
Property Units Acquired | ApartmentUnit | 270
Real estate basis on consolidation | $ 88.4
Land [Member] |
Real estate basis on consolidation | 8.5
Depreciable Property [Member] |
Real estate basis on consolidation | $ 79.9

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- Definition Percentage interest acquired in consolidated operating property. + References No definition available. + Details
Name: | eqr_PercentageInterestAcquiredInConsolidatedOperatingProperty
Namespace Prefix: | eqr_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Property acquired consolidation value. + References No definition available. + Details
Name: | eqr_PropertyAcquiredConsolidationValue
Namespace Prefix: | eqr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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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- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_LandMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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