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Leases - Summary of Reconciliation of Lease Liabilities (Details) $ in Thousands | Dec. 31, 2023 USD ($)
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Leases [Abstract] |
Total minimum rent payments | $ 982,971
Less: Lease discount | (671,331)
Lease liabilities | $ 311,640

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- Definition Lessee operating and financing lease liability payments due. + References No definition available. + Details
Name: | eqr_LesseeOperatingAndFinancingLeaseLiabilityPaymentsDue
Namespace Prefix: | eqr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Lessee operating and financing lease liability undiscounted excess amount. + References No definition available. + Details
Name: | eqr_LesseeOperatingAndFinancingLeaseLiabilityUndiscountedExcessAmount
Namespace Prefix: | eqr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Operating and financing lease liability. + References No definition available. + Details
Name: | eqr_OperatingAndFinancingLeaseLiability
Namespace Prefix: | eqr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- References No definition available. + Details
Name: | us-gaap_LeasesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration