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Real Estate - Acquired Properties From Unaffiliated Parties (Details) | Apr. 01, 2023 ApartmentUnit Property
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Properties acquired | Property | 2
Property Units acquired | ApartmentUnit | 549

X
- 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

X
- 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