XML 98 R86.htm IDEA: XBRL DOCUMENT v3.25.3

Commitments and Contingencies - Summary of Real Estate Development Commitments (Details) $ in Thousands	Sep. 30, 2025 USD ($) ApartmentUnit Project
Projects Under Development Consolidated [Member]
Projects/Investments/Units/Remaining Commitments schedule
Apartment Units | ApartmentUnit	440
Consolidated project under development commitment fund | $	$ 43,077
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 | $	$ 116,495
Projects Under Development [Member]
Projects/Investments/Units/Remaining Commitments schedule
Apartment Units | ApartmentUnit	1,079
Project under development commitment fund | $	$ 159,572
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

X

- Details

Name:	us-gaap_RealEstatePropertiesAxis=eqr_ProjectsUnderDevelopmentConsolidatedMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_RealEstatePropertiesAxis=eqr_ProjectsUnderDevelopmentUnconsolidatedMember
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: