XML 94 R81.htm IDEA: XBRL DOCUMENT
v3.25.1

Commitments and Contingencies - Summary of Real Estate Development Commitments (Parenthetical) (Details) $ in Millions | Mar. 31, 2025 USD ($)
--- | ---
Projects/Investments/Units/Remaining Commitments schedule |
Total project costs remaining under development commitment fund | $ 270.3
Parent |
Projects/Investments/Units/Remaining Commitments schedule |
Total project costs remaining under development commitment fund | 111.3
Corporate Joint Venture |
Projects/Investments/Units/Remaining Commitments schedule |
Total project costs remaining under development commitment fund | 4.1
Construction Loans |
Projects/Investments/Units/Remaining Commitments schedule |
Total project costs remaining under development commitment fund | $ 154.9

X
- Definition Total project costs remaining. + References No definition available. + Details
Name: | eqr_TotalProjectCostsRemaining
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: | srt_ConsolidatedEntitiesAxis=srt_ParentCompanyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=us-gaap_CorporateJointVentureMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_ConstructionLoansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |