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Commitments to Acquire/Dispose of Real Estate (Details) - Subsequent Event [Member] $ in Thousands | Jul. 29, 2016 USD ($) property
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Commitments to Dispose of Real Estate |
Properties Contracted To Be Disposed | property | 9
Units Contracted To Be Disposed | 1,344
Sales Price For Commitments To Dispose | $ 227,830
Rental Properties Disposed of [Member] |
Commitments to Dispose of Real Estate |
Properties Contracted To Be Disposed | property | 9
Units Contracted To Be Disposed | 1,344
Sales Price For Commitments To Dispose | $ 191,680
Land [Member] |
Commitments to Dispose of Real Estate |
Land Parcels Contracted To Be Disposed | 2
Sales Price For Commitments To Dispose | $ 36,150

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- Definition Commitments to Dispose of Real Estate Abstract. + References No definition available. + Details
Name: | eqr_CommitmentsToDisposeOfRealEstateAbstract
Namespace Prefix: | eqr_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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

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- 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

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- 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

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

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- Details
Name: | eqr_CommitmentsToDisposeOfAxis=eqr_RentalPropertiesDisposedOfMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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