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Commitments and Contingencies - Summary of Real Estate Development Commitments (Details) $ in Thousands | Jun. 30, 2025 USD ($) ApartmentUnit Project
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Projects Under Development Consolidated [Member] |
Projects/Investments/Units/Remaining Commitments schedule |
Apartment Units | ApartmentUnit | 440
Consolidated project under development commitment fund | $ | $ 63,546
Number of consolidated projects in various stages of development | Project | 1
Projects Under Development Unconsolidated [Member] |
Projects/Investments/Units/Remaining Commitments schedule |
Apartment Units | ApartmentUnit | 639
Number of unconsolidated projects in various stages of development | Project | 2
Unconsolidated project under development commitment fund | $ | $ 150,228
Projects Under Development [Member] |
Projects/Investments/Units/Remaining Commitments schedule |
Apartment Units | ApartmentUnit | 1,079
Project under development commitment fund | $ | $ 213,774
Number of projects in various stages of development | Project | 3

X
- Definition Represents the company's remaining funding obligation (i.e. total project costs less book value) for consolidated projects that are under development. + References No definition available. + Details
Name: | eqr_ConsolidatedProjectUnderDevelopmentCommitmentFund
Namespace Prefix: | eqr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Number of consolidated projects in various stages of development. + References No definition available. + Details
Name: | eqr_NumberOfConsolidatedProjectsInVariousStagesOfDevelopment
Namespace Prefix: | eqr_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Total number of open development projects. May include projects that are held for and/or under development, completed and not stabilized or completed and stabilized. These projects are consolidated. + References No definition available. + Details
Name: | eqr_NumberOfProjectsInVariousStagesOfDevelopment
Namespace Prefix: | eqr_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number of unconsolidated projects in various stages of development. + References No definition available. + Details
Name: | eqr_NumberOfUnconsolidatedProjectsInVariousStagesOfDevelopment
Namespace Prefix: | eqr_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Total number of units that are associated with open development projects. May include projects that are held for and/or under development, completed and not stabilized or completed and stabilized. These units are consolidated. + References No definition available. + Details
Name: | eqr_NumberOfUnitsInVariousStagesOfDevelopment
Namespace Prefix: | eqr_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Project under development commitment fund. + References No definition available. + Details
Name: | eqr_ProjectUnderDevelopmentCommitmentFund
Namespace Prefix: | eqr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Unconsolidated project under development commitment fund. + References No definition available. + Details
Name: | eqr_UnconsolidatedProjectUnderDevelopmentCommitmentFund
Namespace Prefix: | eqr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- 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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- 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: |

X
- Details
Name: | us-gaap_RealEstatePropertiesAxis=eqr_ProjectsUnderDevelopmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |