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Commitments to Acquire/Dispose of Real Estate - Summary of Separate Agreements to Dispose (Details) $ in Thousands | Dec. 31, 2022 USD ($) ApartmentUnit Property
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Property/Unit schedule |
Properties | Property | 1
Apartment Units | ApartmentUnit | 18
Sales Price | $ 26,750
Net Book Value at December 31, 2022 | $ 17,546
Rental Properties – Consolidated [Member] |
Property/Unit schedule |
Properties | Property | 1
Apartment Units | ApartmentUnit | 18
Sales Price | $ 10,750
Net Book Value at December 31, 2022 | 2,546
Land [Member] |
Property/Unit schedule |
Sales Price | 16,000
Net Book Value at December 31, 2022 | $ 15,000

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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

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

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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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- 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

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- Definition The net book value of the asset(s) sold in connection with the sale of the property to another party and lease back to the seller. + References Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 40 -Section 55 -Paragraph 51 -URI https://asc.fasb.org/extlink&oid=123386837&loc=d3e51840-112757 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 40 -Section 50 -Paragraph 2 -URI https://asc.fasb.org/extlink&oid=128295416&loc=SL77919786-209982 Reference 3: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 40 -Section 55 -Paragraph 52 -URI https://asc.fasb.org/extlink&oid=123386837&loc=d3e51843-112757 Reference 4: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 40 -Section 55 -Paragraph 50 -URI https://asc.fasb.org/extlink&oid=123386837&loc=d3e51831-112757 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |