XML 87 R68.htm IDEA: XBRL DOCUMENT
v3.22.0.1

Investments in Partially Owned Entities - Summary of Company's Consolidated Joint Ventures (Details) | Dec. 31, 2021 Property ApartmentUnit Project
--- | ---
Variable Interest Entity [Line Items] |
Properties | Property | 310
Apartment units | 80,407
Consolidated VIE [Member] | Operating Properties [Member] |
Variable Interest Entity [Line Items] |
Properties | Property | 16
Apartment units | 3,546
Consolidated VIE [Member] | Project Under Development [Member] |
Variable Interest Entity [Line Items] |
Project | Project | 1
Apartment units | 312

X
- Definition Number of projects. + References No definition available. + Details
Name: | eqr_NumberOfProjects
Namespace Prefix: | eqr_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition The number of real estate properties owned as of the balance sheet date. + References No definition available. + Details
Name: | us-gaap_NumberOfRealEstateProperties
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition The number of units in a real estate property owned as of the balance sheet date. + References No definition available. + Details
Name: | us-gaap_NumberOfUnitsInRealEstateProperty
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
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_VariableInterestEntityLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | srt_ConsolidatedEntitiesAxis=us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=eqr_OperatingPropertiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=eqr_ProjectUnderDevelopmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |