XML 133 R116.htm IDEA: XBRL DOCUMENT
v3.24.0.1

Share Incentive Plans - Summary of Terms of Each Retirement Eligibility Category (Details) | 12 Months Ended
--- | ---
Dec. 31, 2023
Age 62 for Employees [Member] |
Defined Benefit Plan Disclosure [Line Items] |
Eligibility | For employees hired prior to January 1, 2009 and who were age 59 or older as of February 1, 2019.
Effect on unvested restricted shares, restricted units and Options | Awards immediately vest, Options continue to be exercisable for the balance of the applicable ten-year option period and restricted units are still subject to the book-up provisions.
Effect on LTI Plan | Awards are prorated in proportion to the number of days worked in the first year of the three-year performance period and the individual does not receive any payout of shares or units until the final payout is determined at the end of the three-year performance period.
Rule of 70 for Employees [Member] |
Defined Benefit Plan Disclosure [Line Items] |
Eligibility | All employees (1).
Effect on unvested restricted shares, restricted units and Options | Awards continue to vest per the original vesting schedule, subject to certain conditions, Options continue to be exercisable for the balance of the applicable ten-year option period and restricted units are still subject to the book-up provisions.
Effect on LTI Plan | Awards are prorated in proportion to the number of days worked in the first year of the three-year performance period and the individual does not receive any payout of shares or units until the final payout is determined at the end of the three-year performance period.
Age 72 for Trustees [Member] |
Defined Benefit Plan Disclosure [Line Items] |
Eligibility | All non-employee Trustees.
Effect on unvested restricted shares, restricted units and Options | Awards immediately vest, Options continue to be exercisable for the balance of the applicable ten-year option period and restricted units are still subject to the book-up provisions.
Effect on LTI Plan | Awards are prorated in proportion to the number of days worked in the first year of the three-year performance period and the individual does not receive any payout of shares or units until the final payout is determined at the end of the three-year performance period.

X
- Definition Description of effect on long term incentive plans. + References No definition available. + Details
Name: | eqr_EffectOnLongTermIncentivePlansDescription
Namespace Prefix: | eqr_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Retirement benefits effect on unvested restricted shares, restricted units and options. + References No definition available. + Details
Name: | eqr_RetirementBenefitsEffectOnUnvestedRestrictedSharesRestrictedUnitsAndOptions
Namespace Prefix: | eqr_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Description of nature of event resulting in defined benefit plan providing special or contractual termination benefits. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (q) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
Name: | us-gaap_DefinedBenefitPlanDescriptionOfNatureOfEventResultingInSpecialOrContractualTerminationBenefitsRecognizedDuringPeriod
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
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_DefinedBenefitPlanDisclosureLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_RetirementPlanTypeAxis=eqr_Age62ForEmployeesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RetirementPlanTypeAxis=eqr_RuleOf70ForEmployeesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RetirementPlanTypeAxis=eqr_Age72ForTrusteesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |