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Commitments to Acquire/Dispose of Real Estate - Separate Agreements to Dispose (Details) - Subsequent Event [Member] $ in Thousands | Feb. 20, 2020 USD ($) Property ApartmentUnit
--- | ---
Property/Unit schedule |
Properties | Property | 4
Apartment Units | ApartmentUnit | 1,416
Sales Price | $ 778,650
Rental Properties Disposed [Member] | Partially Owned Properties – Consolidated |
Property/Unit schedule |
Properties | Property | 4
Apartment Units | ApartmentUnit | 1,416
Sales Price | $ 723,500
Land [Member] |
Property/Unit schedule |
Sales Price | $ 55,150

X
- Definition Total number of rental properties to be disposed of subsequent to the balance sheet date per separate agreements entered into prior to the balance sheet date. + References No definition available. + Details
Name: | eqr_PropertiesContractedToBeDisposed
Namespace Prefix: | eqr_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition The amount of the fixed and determinable portion of an unrecorded sales commitment for the disposition of a rental property, land parcel or other property subsequent to the balance sheet date. + References No definition available. + Details
Name: | eqr_SalesPriceForCommitmentsToDispose
Namespace Prefix: | eqr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Total number of rental units to be disposed of subsequent to the balance sheet date per separate agreements entered into prior to the balance sheet date. + References No definition available. + Details
Name: | eqr_UnitsContractedToBeDisposed
Namespace Prefix: | eqr_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_RealEstatePropertiesLineItems
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_DisposalGroupClassificationAxis=eqr_RentalPropertiesDisposedOfMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RealEstatePropertiesAxis=us-gaap_ConsolidatedPropertiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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