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Real Estate - Disposed Properties to Unaffiliated Parties (Details) $ in Thousands | 9 Months Ended
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Sep. 30, 2019 USD ($) Property ApartmentUnit
Properties disposed | Property | 11
Property Units disposed | ApartmentUnit | 2,147
Sales Price | $ 1,103,075
Rental Properties - Consolidated [Member] |
Properties disposed | Property | 9
Property Units disposed | ApartmentUnit | 1,202
Sales Price | $ 706,675
Rental Properties - Unconsolidated [Member] |
Properties disposed | Property | 2
Property Units disposed | ApartmentUnit | 945
Sales Price | $ 394,500
Land Parcels [Member] |
Sales Price | $ 1,900

X
- Definition The total number of rental properties that the Company disposed of to unaffiliated parties during the period. + References No definition available. + Details
Name: | eqr_DisposedProperties
Namespace Prefix: | eqr_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Total number of rental units associated with rental properties that the company disposed of to unaffiliated third parties during the period. + References No definition available. + Details
Name: | eqr_DisposedUnits
Namespace Prefix: | eqr_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition The cash inflow from the sale of real estate investment property. + References No definition available. + Details
Name: | eqr_ProceedsFromSaleOfProperty
Namespace Prefix: | eqr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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

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

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