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Real Estate and Lease Intangibles - Real Estate Acquisitions and Dispositions (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 USD ($) Property ApartmentUnit | Dec. 31, 2017 USD ($) Property ApartmentUnit
Properties acquired | Property | 5 | 4
Property Units acquired | ApartmentUnit | 1,478 | 947
Purchase Price | $ 707,005 | $ 468,050
Properties disposed | Property | 5 | 5
Property Units disposed | ApartmentUnit | 1,292 | 1,194
Sales Price | $ 708,820 | $ 388,400
Rental Properties – Consolidated [Member] |  |
Properties acquired | Property | 5 | 4
Property Units acquired | ApartmentUnit | 1,478 | 947
Purchase Price | $ 707,005 | $ 468,050
Properties disposed | Property | 5 | 5
Property Units disposed | ApartmentUnit | 1,292 | 1,194
Sales Price | $ 706,120 | $ 354,950
Land [Member] |  |
Purchase Price | $ 113,700 | $ 68,300
Properties disposed | Property | 0 | 0
Property Units disposed | ApartmentUnit | 0 | 0
Sales Price | $ 2,700 | $ 33,450

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- 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

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- 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

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- 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
- Definition Total number of property or properties acquired from unaffiliated third parties during the period. + References No definition available. + Details
Name: | eqr_PropertiesAcquired
Namespace Prefix: | eqr_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition Total number of units associated with the property or properties acquired from unaffiliated third parties during the period. + References No definition available. + Details
Name: | eqr_PropertyUnitsAcquired
Namespace Prefix: | eqr_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of assets acquired at the acquisition date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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_LandMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |