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Real Estate - Disposed Properties to 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 disposed | Property | 6 | 13
Property Units disposed | ApartmentUnit | 2,231 | 3,306
Sales Price | $ 1,122,371 | $ 1,477,275
Rental Properties – Consolidated [Member] |  |
Properties disposed | Property | 6 | 11
Property Units disposed | ApartmentUnit | 2,231 | 2,361
Sales Price | $ 1,066,861 | $ 1,080,675
Rental Properties – Unconsolidated [Member] |  |
Properties disposed | Property |  | 2
Property Units disposed | ApartmentUnit |  | 945
Sales Price |  | $ 394,500
Land Parcels [Member] |  |
Sales Price | $ 55,510 | $ 2,100

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: |