3.26.1 html 416 397 1 false 108 0 false 15 false false R1.htm 75000 - Document - Document and Entity Information Sheet http://www.equityapartments.com/20260630/taxonomy/role/Role_DocumentDocumentAndEntityInformation Document and Entity Information Cover 1 false false R2.htm 75010 - Statement - CONSOLIDATED BALANCE SHEETS (Unaudited) Sheet http://www.equityapartments.com/20260630/taxonomy/role/Role_StatementCONSOLIDATEDBALANCESHEETSUnaudited CONSOLIDATED BALANCE SHEETS (Unaudited) Statements 2 false false R3.htm 75020 - Statement - CONSOLIDATED BALANCE SHEETS (Parenthetical) (Unaudited) Sheet http://www.equityapartments.com/20260630/taxonomy/role/Role_StatementCONSOLIDATEDBALANCESHEETSParentheticalUnaudited CONSOLIDATED BALANCE SHEETS (Parenthetical) (Unaudited) Statements 3 false false R4.htm 75030 - Statement - CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) Sheet http://www.equityapartments.com/20260630/taxonomy/role/Role_StatementCONSOLIDATEDSTATEMENTSOFOPERATIONSUnaudited CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) Statements 4 false false R5.htm 75040 - Statement - CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) Sheet http://www.equityapartments.com/20260630/taxonomy/role/Role_StatementCONSOLIDATEDSTATEMENTSOFCOMPREHENSIVEINCOMEUnaudited CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) Statements 5 false false R6.htm 75050 - Statement - CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) Sheet http://www.equityapartments.com/20260630/taxonomy/role/Role_StatementCONSOLIDATEDSTATEMENTSOFCASHFLOWSUnaudited CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) Statements 6 false false R7.htm 75060 - Statement - CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY (Unaudited) Sheet http://www.equityapartments.com/20260630/taxonomy/role/Role_StatementCONSOLIDATEDSTATEMENTSOFCHANGESINEQUITYUnaudited CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY (Unaudited) Statements 7 false false R8.htm 75070 - Statement - CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY (Parenthetical) Sheet http://www.equityapartments.com/20260630/taxonomy/role/Role_StatementCONSOLIDATEDSTATEMENTSOFCHANGESINEQUITYParenthetical CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY (Parenthetical) Statements 8 false false R9.htm 75080 - Statement - CONSOLIDATED BALANCE SHEETS OF ERP OPERATING LIMITED PARTNERSHIP (Unaudited) Sheet http://www.equityapartments.com/20260630/taxonomy/role/Role_StatementCONSOLIDATEDBALANCESHEETSOFERPOPERATINGLIMITEDPARTNERSHIPUnaudited CONSOLIDATED BALANCE SHEETS OF ERP OPERATING LIMITED PARTNERSHIP (Unaudited) Statements 9 false false R10.htm 75090 - Statement - CONSOLIDATED STATEMENTS OF OPERATIONS OF ERP OPERATING LIMITED PARTNERSHIP (Unaudited) Sheet http://www.equityapartments.com/20260630/taxonomy/role/Role_StatementCONSOLIDATEDSTATEMENTSOFOPERATIONSOFERPOPERATINGLIMITEDPARTNERSHIPUnaudited CONSOLIDATED STATEMENTS OF OPERATIONS OF ERP OPERATING LIMITED PARTNERSHIP (Unaudited) Statements 10 false false R11.htm 75100 - Statement - CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME OF ERP OPERATING LIMITED PARTNERSHIP (Unaudited) Sheet http://www.equityapartments.com/20260630/taxonomy/role/Role_StatementCONSOLIDATEDSTATEMENTSOFCOMPREHENSIVEINCOMEOFERPOPERATINGLIMITEDPARTNERSHIPUnaudited CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME OF ERP OPERATING LIMITED PARTNERSHIP (Unaudited) Statements 11 false false R12.htm 75110 - Statement - CONSOLIDATED STATEMENTS OF CASH FLOWS OF ERP OPERATING LIMITED PARTNERSHIP (Unaudited) Sheet http://www.equityapartments.com/20260630/taxonomy/role/Role_StatementCONSOLIDATEDSTATEMENTSOFCASHFLOWSOFERPOPERATINGLIMITEDPARTNERSHIPUnaudited CONSOLIDATED STATEMENTS OF CASH FLOWS OF ERP OPERATING LIMITED PARTNERSHIP (Unaudited) Statements 12 false false R13.htm 75120 - Statement - CONSOLIDATED STATEMENTS OF CHANGES IN CAPITAL OF ERP OPERATING LIMITED PARTNERSHIP (Unaudited) Sheet http://www.equityapartments.com/20260630/taxonomy/role/Role_StatementCONSOLIDATEDSTATEMENTSOFCHANGESINCAPITALOFERPOPERATINGLIMITEDPARTNERSHIPUnaudited CONSOLIDATED STATEMENTS OF CHANGES IN CAPITAL OF ERP OPERATING LIMITED PARTNERSHIP (Unaudited) Statements 13 false false R14.htm 995410 - Disclosure - Pay vs Performance Disclosure Sheet http://xbrl.sec.gov/ecd/role/PvpDisclosure Pay vs Performance Disclosure Notes 14 false false R15.htm 995445 - Disclosure - Insider Trading Arrangements Sheet http://xbrl.sec.gov/ecd/role/InsiderTradingArrangements Insider Trading Arrangements Notes 15 false false R16.htm 995455 - Disclosure - Business Sheet http://www.equityapartments.com/20260630/taxonomy/role/Role_DisclosureBusiness Business Notes 16 false false R17.htm 995465 - Disclosure - Summary of Significant Accounting Policies Sheet http://www.equityapartments.com/20260630/taxonomy/role/Role_DisclosureSummaryOfSignificantAccountingPolicies Summary of Significant Accounting Policies Notes 17 false false R18.htm 995475 - Disclosure - Equity, Capital and Other Interests Sheet http://www.equityapartments.com/20260630/taxonomy/role/Role_DisclosureEquityCapitalAndOtherInterests Equity, Capital and Other Interests Notes 18 false false R19.htm 995485 - Disclosure - Real Estate Sheet http://www.equityapartments.com/20260630/taxonomy/role/Role_DisclosureRealEstate Real Estate Notes 19 false false R20.htm 995505 - Disclosure - Investments in Partially Owned Entities Sheet http://www.equityapartments.com/20260630/taxonomy/role/Role_DisclosureInvestmentsInPartiallyOwnedEntities Investments in Partially Owned Entities Notes 20 false false R21.htm 995515 - Disclosure - Restricted Deposits Sheet http://www.equityapartments.com/20260630/taxonomy/role/Role_DisclosureRestrictedDeposits Restricted Deposits Notes 21 false false R22.htm 995525 - Disclosure - Leases Sheet http://www.equityapartments.com/20260630/taxonomy/role/Role_DisclosureLeases Leases Notes 22 false false R23.htm 995535 - Disclosure - Debt Sheet http://www.equityapartments.com/20260630/taxonomy/role/Role_DisclosureDebt Debt Notes 23 false false R24.htm 995545 - Disclosure - Fair Value Measurements Sheet http://www.equityapartments.com/20260630/taxonomy/role/Role_DisclosureFairValueMeasurements Fair Value Measurements Notes 24 false false R25.htm 995555 - Disclosure - Earnings Per Share and Earnings Per Unit Sheet http://www.equityapartments.com/20260630/taxonomy/role/Role_DisclosureEarningsPerShareAndEarningsPerUnit Earnings Per Share and Earnings Per Unit Notes 25 false false R26.htm 995565 - Disclosure - Commitments and Contingencies Sheet http://www.equityapartments.com/20260630/taxonomy/role/Role_DisclosureCommitmentsAndContingencies Commitments and Contingencies Notes 26 false false R27.htm 995575 - Disclosure - Reportable Segments Sheet http://www.equityapartments.com/20260630/taxonomy/role/Role_DisclosureReportableSegments Reportable Segments Notes 27 false false R28.htm 995585 - Disclosure - Subsequent Events Sheet http://www.equityapartments.com/20260630/taxonomy/role/Role_DisclosureSubsequentEvents Subsequent Events Notes 28 false false R29.htm 995595 - Disclosure - Summary of Significant Accounting Policies (Policies) Sheet http://www.equityapartments.com/20260630/taxonomy/role/Role_DisclosureSummaryOfSignificantAccountingPoliciesPolicies Summary of Significant Accounting Policies (Policies) Policies http://www.equityapartments.com/20260630/taxonomy/role/Role_DisclosureSummaryOfSignificantAccountingPolicies 29 false false R30.htm 995605 - Disclosure - Business (Tables) Sheet http://www.equityapartments.com/20260630/taxonomy/role/Role_DisclosureBusinessTables Business (Tables) Tables http://www.equityapartments.com/20260630/taxonomy/role/Role_DisclosureBusiness 30 false false R31.htm 995615 - Disclosure - Equity, Capital and Other Interests (Tables) Sheet http://www.equityapartments.com/20260630/taxonomy/role/Role_DisclosureEquityCapitalAndOtherInterestsTables Equity, Capital and Other Interests (Tables) Tables http://www.equityapartments.com/20260630/taxonomy/role/Role_DisclosureEquityCapitalAndOtherInterests 31 false false R32.htm 995625 - Disclosure - Real Estate (Tables) Sheet http://www.equityapartments.com/20260630/taxonomy/role/Role_DisclosureRealEstateTables Real Estate (Tables) Tables http://www.equityapartments.com/20260630/taxonomy/role/Role_DisclosureRealEstate 32 false false R33.htm 995635 - Disclosure - Investments in Partially Owned Entities (Tables) Sheet http://www.equityapartments.com/20260630/taxonomy/role/Role_DisclosureInvestmentsInPartiallyOwnedEntitiesTables Investments in Partially Owned Entities (Tables) Tables http://www.equityapartments.com/20260630/taxonomy/role/Role_DisclosureInvestmentsInPartiallyOwnedEntities 33 false false R34.htm 995645 - Disclosure - Restricted Deposits (Tables) Sheet http://www.equityapartments.com/20260630/taxonomy/role/Role_DisclosureRestrictedDepositsTables Restricted Deposits (Tables) Tables http://www.equityapartments.com/20260630/taxonomy/role/Role_DisclosureRestrictedDeposits 34 false false R35.htm 995655 - Disclosure - Leases (Tables) Sheet http://www.equityapartments.com/20260630/taxonomy/role/Role_DisclosureLeasesTables Leases (Tables) Tables http://www.equityapartments.com/20260630/taxonomy/role/Role_DisclosureLeases 35 false false R36.htm 995665 - Disclosure - Debt (Tables) Sheet http://www.equityapartments.com/20260630/taxonomy/role/Role_DisclosureDebtTables Debt (Tables) Tables http://www.equityapartments.com/20260630/taxonomy/role/Role_DisclosureDebt 36 false false R37.htm 995675 - Disclosure - Fair Value Measurements (Tables) Sheet http://www.equityapartments.com/20260630/taxonomy/role/Role_DisclosureFairValueMeasurementsTables Fair Value Measurements (Tables) Tables http://www.equityapartments.com/20260630/taxonomy/role/Role_DisclosureFairValueMeasurements 37 false false R38.htm 995685 - Disclosure - Earnings Per Share and Earnings Per Unit (Tables) Sheet http://www.equityapartments.com/20260630/taxonomy/role/Role_DisclosureEarningsPerShareAndEarningsPerUnitTables Earnings Per Share and Earnings Per Unit (Tables) Tables http://www.equityapartments.com/20260630/taxonomy/role/Role_DisclosureEarningsPerShareAndEarningsPerUnit 38 false false R39.htm 995695 - Disclosure - Commitments and Contingencies (Tables) Sheet http://www.equityapartments.com/20260630/taxonomy/role/Role_DisclosureCommitmentsAndContingenciesTables Commitments and Contingencies (Tables) Tables http://www.equityapartments.com/20260630/taxonomy/role/Role_DisclosureCommitmentsAndContingencies 39 false false R40.htm 995705 - Disclosure - Reportable Segments (Tables) Sheet http://www.equityapartments.com/20260630/taxonomy/role/Role_DisclosureReportableSegmentsTables Reportable Segments (Tables) Tables http://www.equityapartments.com/20260630/taxonomy/role/Role_DisclosureReportableSegments 40 false false R41.htm 995725 - Disclosure - Business - Additional Information (Details) Sheet http://www.equityapartments.com/20260630/taxonomy/role/Role_DisclosureBusinessAdditionalInformationDetails Business - Additional Information (Details) Details 41 false false R42.htm 995735 - Disclosure - Business - Ownership Breakdown (Details) Sheet http://www.equityapartments.com/20260630/taxonomy/role/Role_DisclosureBusinessOwnershipBreakdownDetails Business - Ownership Breakdown (Details) Details 42 false false R43.htm 995745 - Disclosure - Summary of Significant Accounting Policies - Additional Information (Details) Sheet http://www.equityapartments.com/20260630/taxonomy/role/Role_DisclosureSummaryOfSignificantAccountingPoliciesAdditionalInformationDetails Summary of Significant Accounting Policies - Additional Information (Details) Details 43 false false R44.htm 995755 - Disclosure - Equity, Capital and Other Interests - Changes in Company's Issued and Outstanding Common Shares and Units (Details) Sheet http://www.equityapartments.com/20260630/taxonomy/role/Role_DisclosureEquityCapitalAndOtherInterestsChangesInCompanySIssuedAndOutstandingCommonSharesAndUnitsDetails Equity, Capital and Other Interests - Changes in Company's Issued and Outstanding Common Shares and Units (Details) Details 44 false false R45.htm 995765 - Disclosure - Equity, Capital and Other Interests - Changes in Operating Partnership's Issued and Outstanding General Partner Units and Limited Partner Units (Details) Sheet http://www.equityapartments.com/20260630/taxonomy/role/Role_DisclosureEquityCapitalAndOtherInterestsChangesInOperatingPartnershipSIssuedAndOutstandingGeneralPartnerUnitsAndLimitedPartnerUnitsDetails Equity, Capital and Other Interests - Changes in Operating Partnership's Issued and Outstanding General Partner Units and Limited Partner Units (Details) Details 45 false false R46.htm 995775 - Disclosure - Equity, Capital and Other Interests - Additional Information (Details) Sheet http://www.equityapartments.com/20260630/taxonomy/role/Role_DisclosureEquityCapitalAndOtherInterestsAdditionalInformationDetails Equity, Capital and Other Interests - Additional Information (Details) Details 46 false false R47.htm 995785 - Disclosure - Equity, Capital and Other Interests - Changes in Redemption Value of Redeemable Noncontrolling Interests - Operating Partnership (Details) Sheet http://www.equityapartments.com/20260630/taxonomy/role/Role_DisclosureEquityCapitalAndOtherInterestsChangesInRedemptionValueOfRedeemableNoncontrollingInterestsOperatingPartnershipDetails Equity, Capital and Other Interests - Changes in Redemption Value of Redeemable Noncontrolling Interests - Operating Partnership (Details) Details 47 false false R48.htm 995805 - Disclosure - Equity, Capital and Other Interests - Changes in Redemption Value of Redeemable Limited Partners Interest (Details) Sheet http://www.equityapartments.com/20260630/taxonomy/role/Role_DisclosureEquityCapitalAndOtherInterestsChangesInRedemptionValueOfRedeemableLimitedPartnersInterestDetails Equity, Capital and Other Interests - Changes in Redemption Value of Redeemable Limited Partners Interest (Details) Details 48 false false R49.htm 995825 - Disclosure - Equity, Capital and Other Interests - Issued and Outstanding Preferred Shares and Preference Units (Details) Sheet http://www.equityapartments.com/20260630/taxonomy/role/Role_DisclosureEquityCapitalAndOtherInterestsIssuedAndOutstandingPreferredSharesAndPreferenceUnitsDetails Equity, Capital and Other Interests - Issued and Outstanding Preferred Shares and Preference Units (Details) Details 49 false false R50.htm 995835 - Disclosure - Equity, Capital and Other Interests - Issued and Outstanding Preferred Shares and Preference Units (Parenthetical) (Details) Sheet http://www.equityapartments.com/20260630/taxonomy/role/Role_DisclosureEquityCapitalAndOtherInterestsIssuedAndOutstandingPreferredSharesAndPreferenceUnitsParentheticalDetails Equity, Capital and Other Interests - Issued and Outstanding Preferred Shares and Preference Units (Parenthetical) (Details) Details 50 false false R51.htm 995845 - Disclosure - Equity, Capital and Other Interests - Other - Additional Information (Details) Sheet http://www.equityapartments.com/20260630/taxonomy/role/Role_DisclosureEquityCapitalAndOtherInterestsOtherAdditionalInformationDetails Equity, Capital and Other Interests - Other - Additional Information (Details) Details 51 false false R52.htm 995855 - Disclosure - Real Estate - Summary of Carrying Amounts of Investment in Real Estate (Details) Sheet http://www.equityapartments.com/20260630/taxonomy/role/Role_DisclosureRealEstateSummaryOfCarryingAmountsOfInvestmentInRealEstateDetails Real Estate - Summary of Carrying Amounts of Investment in Real Estate (Details) Details 52 false false R53.htm 995865 - Disclosure - Real Estate - Disposed Properties to Unaffiliated Parties (Details) Sheet http://www.equityapartments.com/20260630/taxonomy/role/DisclosureRealEstateDisposedPropertiesToUnaffiliatedPartiesDetails Real Estate - Disposed Properties to Unaffiliated Parties (Details) Details 53 false false R54.htm 995895 - Disclosure - Investments in Partially Owned Entities - Summary of Company's Consolidated Joint Ventures (Details) Sheet http://www.equityapartments.com/20260630/taxonomy/role/Role_DisclosureInvestmentsInPartiallyOwnedEntitiesSummaryOfCompanySConsolidatedJointVenturesDetails Investments in Partially Owned Entities - Summary of Company's Consolidated Joint Ventures (Details) Details 54 false false R55.htm 995915 - Disclosure - Investments in Partially Owned Entities - Summary of Consolidated Assets and Liabilities Related to the Company's VIEs (Details) Sheet http://www.equityapartments.com/20260630/taxonomy/role/DisclosureInvestmentsInPartiallyOwnedEntitiesSummaryOfConsolidatedAssetsAndLiabilitiesRelatedToTheCompanysViesDetails Investments in Partially Owned Entities - Summary of Consolidated Assets and Liabilities Related to the Company's VIEs (Details) Details 55 false false R56.htm 995925 - Disclosure - Investments in Partially Owned Entities - Summary of Company's Investment in Unconsolidated Entities (Details) Sheet http://www.equityapartments.com/20260630/taxonomy/role/Role_DisclosureInvestmentsInPartiallyOwnedEntitiesSummaryOfCompanySInvestmentInUnconsolidatedEntitiesDetails Investments in Partially Owned Entities - Summary of Company's Investment in Unconsolidated Entities (Details) Details 56 false false R57.htm 995935 - Disclosure - Investments in Partially Owned Entities - Summary of Company's Unconsolidated Real Estate Joint Ventures Deemed to be VIEs (Details) Sheet http://www.equityapartments.com/20260630/taxonomy/role/DisclosureInvestmentsInPartiallyOwnedEntitiesSummaryOfCompanysUnconsolidatedRealEstateJointVenturesDeemedToBeViesDetails Investments in Partially Owned Entities - Summary of Company's Unconsolidated Real Estate Joint Ventures Deemed to be VIEs (Details) Details 57 false false R58.htm 995965 - Disclosure - Restricted Deposits - Restricted Deposits (Details) Sheet http://www.equityapartments.com/20260630/taxonomy/role/Role_DisclosureRestrictedDepositsRestrictedDepositsDetails Restricted Deposits - Restricted Deposits (Details) Details 58 false false R59.htm 995975 - Disclosure - Leases - Summary of Lease Income Types Relating to Lease Payments Along With the Total Other Rental Income (Details) Sheet http://www.equityapartments.com/20260630/taxonomy/role/Role_DisclosureLeasesSummaryOfLeaseIncomeTypesRelatingToLeasePaymentsAlongWithTotalOtherRentalIncomeDetails Leases - Summary of Lease Income Types Relating to Lease Payments Along With the Total Other Rental Income (Details) Details 59 false false R60.htm 996005 - Disclosure - Debt - Mortgage Notes Payable - Summary of Mortgage Notes Payable Activity (Details) Notes http://www.equityapartments.com/20260630/taxonomy/role/Role_DisclosureDebtMortgageNotesPayableSummaryOfMortgageNotesPayableActivityDetails Debt - Mortgage Notes Payable - Summary of Mortgage Notes Payable Activity (Details) Details 60 false false R61.htm 996025 - Disclosure - Debt - Mortgage Notes Payable - Summary of Certain Interest Rate and Maturity Date Information (Details) Notes http://www.equityapartments.com/20260630/taxonomy/role/Role_DisclosureDebtMortgageNotesPayableSummaryOfCertainInterestRateAndMaturityDateInformationDetails Debt - Mortgage Notes Payable - Summary of Certain Interest Rate and Maturity Date Information (Details) Details 61 false false R62.htm 996035 - Disclosure - Debt - Mortgage Notes Payable - Additional Information (Details) Notes http://www.equityapartments.com/20260630/taxonomy/role/Role_DisclosureDebtMortgageNotesPayableAdditionalInformationDetails Debt - Mortgage Notes Payable - Additional Information (Details) Details 62 false false R63.htm 996045 - Disclosure - Debt - Notes - Summary of Notes Activity (Details) Notes http://www.equityapartments.com/20260630/taxonomy/role/Role_DisclosureDebtNotesSummaryOfNotesActivityDetails Debt - Notes - Summary of Notes Activity (Details) Details 63 false false R64.htm 996065 - Disclosure - Debt - Notes - Summary of Certain Interest Rate and Maturity Date Information (Details) Notes http://www.equityapartments.com/20260630/taxonomy/role/Role_DisclosureDebtNotesSummaryOfCertainInterestRateAndMaturityDateInformationDetails Debt - Notes - Summary of Certain Interest Rate and Maturity Date Information (Details) Details 64 false false R65.htm 996075 - Disclosure - Debt - Line of Credit and Commercial Paper - Additional Information (Details) Sheet http://www.equityapartments.com/20260630/taxonomy/role/Role_DisclosureDebtLineOfCreditAndCommercialPaperAdditionalInformationDetails Debt - Line of Credit and Commercial Paper - Additional Information (Details) Details 65 false false R66.htm 996085 - Disclosure - Debt - Line of Credit and Commercial Paper - Summary of Certain Weighted Average Interest Rate, Maturity and Amount Outstanding Information for the Commercial Paper Program (Details) Sheet http://www.equityapartments.com/20260630/taxonomy/role/DisclosureDebtLineOfCreditAndCommercialPaperSummaryOfCertainWeightedAverageInterestRateMaturityAndAmountOutstandingInformationForTheCom Debt - Line of Credit and Commercial Paper - Summary of Certain Weighted Average Interest Rate, Maturity and Amount Outstanding Information for the Commercial Paper Program (Details) Details 66 false false R67.htm 996095 - Disclosure - Debt - Line of Credit and Commercial Paper - Schedule of Unsecured Revolving Credit Facility (Details) Sheet http://www.equityapartments.com/20260630/taxonomy/role/Role_DisclosureDebtLineOfCreditAndCommercialPaperScheduleOfUnsecuredRevolvingCreditFacilityDetails Debt - Line of Credit and Commercial Paper - Schedule of Unsecured Revolving Credit Facility (Details) Details 67 false false R68.htm 996105 - Disclosure - Fair Value Measurements - Summary of Valuations for Each Type of Fair Value Measurement (Details) Sheet http://www.equityapartments.com/20260630/taxonomy/role/Role_DisclosureFairValueMeasurementsSummaryOfValuationsForEachTypeOfFairValueMeasurementDetails Fair Value Measurements - Summary of Valuations for Each Type of Fair Value Measurement (Details) Details 68 false false R69.htm 996115 - Disclosure - Fair Value Measurements - Summary of Carrying and Fair Values of Financial Instruments (Details) Sheet http://www.equityapartments.com/20260630/taxonomy/role/Role_DisclosureFairValueMeasurementsSummaryOfCarryingAndFairValuesOfFinancialInstrumentsDetails Fair Value Measurements - Summary of Carrying and Fair Values of Financial Instruments (Details) Details 69 false false R70.htm 996135 - Disclosure - Fair Value Measurements - Summary of Fair Value Measurements for Each Major Category of Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) Sheet http://www.equityapartments.com/20260630/taxonomy/role/Role_DisclosureFairValueMeasurementsSummaryOfFairValueMeasurementsForEachMajorCategoryOfAssetsAndLiabilitiesMeasuredAtFairValueOnRecurringBasisDetails Fair Value Measurements - Summary of Fair Value Measurements for Each Major Category of Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) Details 70 false false R71.htm 996155 - Disclosure - Fair Value Measurements - Summary of Effect of Cash Flow Hedges on the Accompanying Consolidated Statements of Operations and Comprehensive Income (Details) Sheet http://www.equityapartments.com/20260630/taxonomy/role/Role_DisclosureFairValueMeasurementsSummaryOfEffectOfCashFlowHedgesOnAccompanyingConsolidatedStatementsOfOperationsAndComprehensiveIncomeDetails Fair Value Measurements - Summary of Effect of Cash Flow Hedges on the Accompanying Consolidated Statements of Operations and Comprehensive Income (Details) Details 71 false false R72.htm 996165 - Disclosure - Fair Value Measurements - Additional Information (Details) Sheet http://www.equityapartments.com/20260630/taxonomy/role/Role_DisclosureFairValueMeasurementsAdditionalInformationDetails Fair Value Measurements - Additional Information (Details) Details 72 false false R73.htm 996175 - Disclosure - Fair Value Measurements - Summary of Real Estate Technology Investment Securities included in Other Assets (Details) Sheet http://www.equityapartments.com/20260630/taxonomy/role/DisclosureFairValueMeasurementsSummaryOfRealEstateTechnologyInvestmentSecuritiesIncludedInOtherAssetsDetails Fair Value Measurements - Summary of Real Estate Technology Investment Securities included in Other Assets (Details) Details 73 false false R74.htm 996185 - Disclosure - Earnings Per Share and Earnings Per Unit - Computation of Net Income per Share Basic and Net Income per Share Diluted (Details) Sheet http://www.equityapartments.com/20260630/taxonomy/role/Role_DisclosureEarningsPerShareAndEarningsPerUnitComputationOfNetIncomePerShareBasicAndNetIncomePerShareDilutedDetails Earnings Per Share and Earnings Per Unit - Computation of Net Income per Share Basic and Net Income per Share Diluted (Details) Details 74 false false R75.htm 996205 - Disclosure - Earnings Per Share and Earnings Per Unit - Computation of Net Income per Unit Basic and Net Income per Unit Diluted for Operating Partnership (Details) Sheet http://www.equityapartments.com/20260630/taxonomy/role/Role_DisclosureEarningsPerShareAndEarningsPerUnitComputationOfNetIncomePerUnitBasicAndNetIncomePerUnitDilutedForOperatingPartnershipDetails Earnings Per Share and Earnings Per Unit - Computation of Net Income per Unit Basic and Net Income per Unit Diluted for Operating Partnership (Details) Details 75 false false R76.htm 996215 - Disclosure - Commitments and Contingencies - Summary of Real Estate Development Commitments (Details) Sheet http://www.equityapartments.com/20260630/taxonomy/role/Role_DisclosureCommitmentsAndContingenciesSummaryOfRealEstateDevelopmentCommitmentsDetails Commitments and Contingencies - Summary of Real Estate Development Commitments (Details) Details 76 false false R77.htm 996225 - Disclosure - Commitments and Contingencies - Summary of Real Estate Development Commitments (Parenthetical) (Details) Sheet http://www.equityapartments.com/20260630/taxonomy/role/Role_DisclosureCommitmentsAndContingenciesSummaryOfRealEstateDevelopmentCommitmentsParentheticalDetails Commitments and Contingencies - Summary of Real Estate Development Commitments (Parenthetical) (Details) Details 77 false false R78.htm 996235 - Disclosure - Commitments and Contingencies - Additional Information (Details) Sheet http://www.equityapartments.com/20260630/taxonomy/role/Role_DisclosureCommitmentsAndContingenciesAdditionalInformationDetails Commitments and Contingencies - Additional Information (Details) Details 78 false false R79.htm 996245 - Disclosure - Reportable Segments - Additional Information (Details) Sheet http://www.equityapartments.com/20260630/taxonomy/role/Role_DisclosureReportableSegmentsAdditionalInformationDetails Reportable Segments - Additional Information (Details) Details 79 false false R80.htm 996255 - Disclosure - Reportable Segments - Schedule of Reconciliation of Net Income Per Consolidated Statements of Operations to NOI (Details) Sheet http://www.equityapartments.com/20260630/taxonomy/role/DisclosureReportableSegmentsScheduleOfReconciliationOfNetIncomePerConsolidatedStatementsOfOperationsToNoiDetails Reportable Segments - Schedule of Reconciliation of Net Income Per Consolidated Statements of Operations to NOI (Details) Details 80 false false R81.htm 996265 - Disclosure - Reportable Segments - NOI from Our Rental Real Estate for Continuing Operations (Details) Sheet http://www.equityapartments.com/20260630/taxonomy/role/DisclosureReportableSegmentsNoiFromOurRentalRealEstateForContinuingOperationsDetails Reportable Segments - NOI from Our Rental Real Estate for Continuing Operations (Details) Details 81 false false R82.htm 996275 - Disclosure - Reportable Segments - NOI from Our Rental Real Estate for Each Segment Specific to Continuing Operations (Parenthetical) (Details) Sheet http://www.equityapartments.com/20260630/taxonomy/role/Role_DisclosureReportableSegmentsNOIFromOurRentalRealEstateForEachSegmentSpecificToContinuingOperationsParentheticalDetails Reportable Segments - NOI from Our Rental Real Estate for Each Segment Specific to Continuing Operations (Parenthetical) (Details) Details 82 false false R83.htm 996285 - Disclosure - Reportable Segments - Schedule of Reconciliation of Operating Expenses (Details) Sheet http://www.equityapartments.com/20260630/taxonomy/role/DisclosureReportableSegmentsScheduleOfReconciliationOfOperatingExpensesDetails Reportable Segments - Schedule of Reconciliation of Operating Expenses (Details) Details 83 false false R84.htm 996295 - Disclosure - Reportable Segments - Schedule of Reconciliation of Operating Expenses (Parenthetical) (Details) Sheet http://www.equityapartments.com/20260630/taxonomy/role/DisclosureReportableSegmentsScheduleOfReconciliationOfOperatingExpensesParentheticalDetails Reportable Segments - Schedule of Reconciliation of Operating Expenses (Parenthetical) (Details) Details 84 false false R85.htm 996305 - Disclosure - Reportable Segments - Schedule of Reconciliation of Total Assets and Capital Expenditures (Details) Sheet http://www.equityapartments.com/20260630/taxonomy/role/DisclosureReportableSegmentsScheduleOfReconciliationOfTotalAssetsAndCapitalExpendituresDetails Reportable Segments - Schedule of Reconciliation of Total Assets and Capital Expenditures (Details) Details 85 false false R86.htm 996315 - Disclosure - Reportable Segments - Schedule of Reconciliation of Total Assets and Capital Expenditures (Parenthetical) (Details) Sheet http://www.equityapartments.com/20260630/taxonomy/role/DisclosureReportableSegmentsScheduleOfReconciliationOfTotalAssetsAndCapitalExpendituresParentheticalDetails Reportable Segments - Schedule of Reconciliation of Total Assets and Capital Expenditures (Parenthetical) (Details) Details 86 false false All Reports Book All Reports eqr-20260630.htm eqr-20260630.xsd img253273983_0.gif http://fasb.org/us-gaap/2026 http://xbrl.sec.gov/dei/2026 http://xbrl.sec.gov/ecd/2026 false false