XML 84 R68.htm IDEA: XBRL DOCUMENT
v3.22.1

Leases - Summary of Residential Bad Debt for Company's Properties (Details) - Residential Leases [Member] - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2022 | Mar. 31, 2021
Lessor Lease Description [Line Items] |  |
Bad debt, net | $ 9,895 | $ 13,693
% of rental income | 1.60% | 2.40%

X
- Definition Operating lease lease income bad debt net. + References No definition available. + Details
Name: | eqr_OperatingLeaseLeaseIncomeBadDebtNet
Namespace Prefix: | eqr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Percentage of rental income. + References No definition available. + Details
Name: | eqr_PercentageOfRentalIncome
Namespace Prefix: | eqr_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

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_LessorLeaseDescriptionLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_TypeOfArrangementAxis=eqr_ResidentialLeasesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |