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Commitments and Contingencies - Summary of Real Estate Development Commitments (Details) $ in Thousands | Dec. 31, 2022 USD ($) Apartment Project
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Projects Under Development Consolidated [Member] |
Projects/Investments/Units/Remaining Commitments schedule |
Number of consolidated projects in various stages of development | Project | 2
Apartment Units | Apartment | 537
Consolidated project under development commitment fund | $ | $ 147,708
Projects Under Development Unconsolidated [Member] |
Projects/Investments/Units/Remaining Commitments schedule |
Number of unconsolidated projects in various stages of development | Project | 6
Apartment Units | Apartment | 1,982
Unconsolidated project under development commitment fund | $ | $ 358,277
Projects Under Development [Member] |
Projects/Investments/Units/Remaining Commitments schedule |
Number of projects in various stages of development | Project | 8
Apartment Units | Apartment | 2,519
Project under development commitment fund | $ | $ 505,985

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- 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
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Data Type: | xbrli:integerItemType
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- 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
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Namespace Prefix: | eqr_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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

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- 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

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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
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Balance Type: | na
Period Type: | duration

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- Details
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Balance Type: |
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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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