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v3.19.3.a.u2

Subsequent Events - Additional Information (Details) - Subsequent Event - Property/Apartment [Member] $ in Millions | Jan. 01, 2020 USD ($) Property ApartmentUnit
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Subsequent Event [Line Items] |
Number of properties sold | Property | 1
Number of self managed apartments | ApartmentUnit | 136
Amount of property sold | $ | $ 31.2

X
- Definition Amount of property sold. + References No definition available. + Details
Name: | eqr_AmountOfPropertySold
Namespace Prefix: | eqr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Number of properties sold. + References No definition available. + Details
Name: | eqr_NumberOfPropertiesSold
Namespace Prefix: | eqr_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of self managed apartments. + References No definition available. + Details
Name: | eqr_NumberOfSelfManagedApartments
Namespace Prefix: | eqr_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References No definition available. + Details
Name: | us-gaap_SubsequentEventLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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