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Commitments to Acquire/Dispose of Real Estate (Details) $ in Thousands | Oct. 30, 2015 USD ($) property
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Starwood Portfolio [Member] |
Commitments to Dispose of Real Estate |
Properties Disposed - Total | property | 72
Rental Units Disposed-Total | 23,262
Sales Price For Commitments To Dispose | $ 5,365,000
Commitments [Member] |
Commitments to Acquire Real Estate |
Properties Acquired-Total | property | 0
Rental Units Acquired - Total | 2
Purchase Price - Total | $ 6,000
Commitments to Dispose of Real Estate |
Properties Disposed - Total | property | 77
Rental Units Disposed-Total | 23,961
Sales Price For Commitments To Dispose | $ 5,860,103
Commitments [Member] | Rental Properties Disposed of [Member] |
Commitments to Dispose of Real Estate |
Properties Disposed - Total | property | 77
Rental Units Disposed-Total | 23,961
Sales Price For Commitments To Dispose | $ 5,830,203
Commitments [Member] | Land [Member] |
Commitments to Dispose of Real Estate |
Sales Price For Commitments To Dispose | $ 29,900
Land Parcels Contracted To Be Disposed | 3
Commitments [Member] | Consolidated Rental Properties [Member] |
Commitments to Acquire Real Estate |
Purchase Price - Total | $ 6,000

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

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- Definition Commitments to Dispose of Real Estate Abstract. + References No definition available. + Details
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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
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Namespace Prefix: | eqr_
Data Type: | xbrli:integerItemType
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Period Type: | instant

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

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
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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 purchase commitment for the acquisition of a rental property or land parcel subsequent to the balance sheet date. + References No definition available. + Details
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Namespace Prefix: | eqr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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 acquired subsequent to the balance sheet date per separate agreements entered into prior to the balance sheet date. + References No definition available. + Details
Name: | eqr_UnitsContractedToBeAcquired
Namespace Prefix: | eqr_
Data Type: | xbrli:integerItemType
Balance Type: | na
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
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Balance Type: | na
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- Details
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Namespace Prefix: |
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- Details
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- Details
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- Details
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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |