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Subsequent Events - Acquired Properties From Unaffiliated Parties (Details) - Rental Properties - Consolidated [Member] $ in Thousands |  | 6 Months Ended
--- | --- | ---
Jul. 01, 2024 USD ($) ApartmentUnit Property | Jun. 30, 2024 USD ($) ApartmentUnit Property
Subsequent Event [Line Items] |  |
Properties | Property |  | 1
Apartment Units | ApartmentUnit |  | 160
Purchase Price | $ |  | $ 62,595
Subsequent Events [Member] |  |
Subsequent Event [Line Items] |  |
Properties | Property | 2 |
Apartment Units | ApartmentUnit | 644 |
Purchase Price | $ | $ 216,750 |

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

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- Definition Amount of assets acquired at the acquisition date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479907/805-20-50-1 + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 830 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481674/830-30-50-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 855 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147483399/855-10-50-2 + Details
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
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Period Type: |