XML 92 R73.htm IDEA: XBRL DOCUMENT
v3.22.0.1

Investments in Partially Owned Entities - Summary of Company's Unconsolidated Joint Ventures Deemed to be VIEs (Parenthetical) (Details) | Dec. 31, 2021 Land
--- | ---
Land Held For Development [Member] |
Variable Interest Entity [Line Items] |
Number of land parcel subject to long-term ground lease | 1

X
- Definition Number of land parcel subject to long-term ground lease. + References No definition available. + Details
Name: | eqr_NumberOfLandParcelSubjectToLongTermGroundLease
Namespace Prefix: | eqr_
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_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=eqr_LandHeldForDevelopmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |