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Real Estate - Acquired Properties From Unaffiliated Parties (Parenthetical) (Details) $ in Thousands | Mar. 31, 2019 USD ($)
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Purchase Price | $ 258,650
Land [Member] |
Purchase Price | 43,200
Depreciable Property [Member] |
Purchase Price | $ 215,700

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- 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

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

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