EQR


Line plots across dimensions of each concept
Tables

Table of contents



us-gaap:CommonStockValue

us-gaap:CommonStockSharesIssued

us-gaap:CommonStockSharesOutstanding

us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding
dei:LegalEntity

us-gaap:WeightedAverageNumberOfSharesOutstandingBasic

us-gaap:EarningsPerShareBasic
dei:LegalEntity

us-gaap:EarningsPerShareDiluted
dei:LegalEntity

us-gaap:RevenueFromContractWithCustomerIncludingAssessedTax
dei:LegalEntity

us-gaap:Revenues
dei:LegalEntity
us-gaap:StatementBusinessSegments
us-gaap:OperatingExpenses
us-gaap:StatementGeographical, us-gaap:StatementBusinessSegments

us-gaap:CostsAndExpenses
dei:LegalEntity

us-gaap:GeneralAndAdministrativeExpense
dei:LegalEntity

us-gaap:OperatingIncomeLoss
dei:LegalEntity
us-gaap:StatementBusinessSegments
us-gaap:StatementGeographical, us-gaap:StatementBusinessSegments

us-gaap:InterestExpenseDebt
dei:LegalEntity

us-gaap:IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest
dei:LegalEntity

us-gaap:IncomeTaxExpenseBenefit
dei:LegalEntity

us-gaap:IncomeTaxesPaidNet
dei:LegalEntity

us-gaap:ProfitLoss
dei:LegalEntity

us-gaap:ComprehensiveIncomeNetOfTax
dei:LegalEntity

us-gaap:ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest
dei:LegalEntity

us-gaap:ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest
dei:LegalEntity

us-gaap:NetIncomeLoss
dei:LegalEntity
us-gaap:StatementEquityComponents

us-gaap:NetIncomeLossAvailableToCommonStockholdersBasic

us-gaap:NetIncomeLossAvailableToCommonStockholdersDiluted

us-gaap:NetIncomeLossAttributableToNoncontrollingInterest
us-gaap:StatementEquityComponents

us-gaap:Assets

us-gaap:Liabilities
dei:LegalEntity
us-gaap:ConsolidatedEntities

us-gaap:LiabilitiesAndStockholdersEquity
dei:LegalEntity

us-gaap:StockholdersEquity
us-gaap:StatementEquityComponents

us-gaap:CashAndCashEquivalentsAtCarryingValue
dei:LegalEntity

us-gaap:Land
dei:LegalEntity

us-gaap:InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures
dei:LegalEntity

us-gaap:MinorityInterest
us-gaap:StatementEquityComponents

us-gaap:StockholdersEquity
us-gaap:StatementEquityComponents

us-gaap:CommonStockValue

us-gaap:RetainedEarningsAccumulatedDeficit

us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax
dei:LegalEntity

us-gaap:NetCashProvidedByUsedInOperatingActivities
dei:LegalEntity

us-gaap:NetCashProvidedByUsedInInvestingActivities
dei:LegalEntity

us-gaap:NetCashProvidedByUsedInFinancingActivities
dei:LegalEntity

us-gaap:NetCashProvidedByUsedInOperatingActivities
dei:LegalEntity

us-gaap:NetIncomeLoss
dei:LegalEntity
us-gaap:StatementEquityComponents

us-gaap:ProfitLoss
dei:LegalEntity

us-gaap:NetCashProvidedByUsedInInvestingActivities
dei:LegalEntity

us-gaap:NetCashProvidedByUsedInFinancingActivities
dei:LegalEntity

us-gaap:RepaymentsOfLongTermDebt
us-gaap:DebtInstrument, us-gaap:LongtermDebtType
us-gaap:LongtermDebtType, us-gaap:SubsequentEventType

us-gaap:RepaymentsOfLongTermDebt
us-gaap:DebtInstrument, us-gaap:LongtermDebtType
us-gaap:LongtermDebtType, us-gaap:SubsequentEventType

us-gaap:ShareBasedCompensation
dei:LegalEntity
us-gaap:PartnerTypeOfPartnersCapitalAccount, dei:LegalEntity
eqr:AdjustmentForLimitedPartnersOwnershipInOperatingPartnership
us-gaap:StatementEquityComponents
eqr:AdjustmentToAdditionalPaidInCapitalAndNoncontrollingOwnershipInterest
us-gaap:StatementEquityComponents
eqr:AdjustmentToAdditionalPaidInCapitalResultingFromConversionOfCapitalUnits

eqr:AllocationOfNetIncomeLossToNoncontrollingInterestsPartiallyOwnedProperties
dei:LegalEntity
us-gaap:PartnerTypeOfPartnersCapitalAccount, dei:LegalEntity

eqr:AmortizationOfDeferredFinancingCosts
dei:LegalEntity

eqr:AmortizationOfDeferredFinancingCostsInvestmentInRealEstateNet

eqr:AmortizationOfDeferredFinancingCostsMortgageNotesPayableNet
dei:LegalEntity

eqr:AmortizationOfDeferredFinancingCostsNetMortgageNotesPayableNet
us-gaap:DebtInstrument, us-gaap:LongtermDebtType
us-gaap:LongtermDebtType

eqr:AmortizationOfDeferredFinancingCostsNotesNet
dei:LegalEntity

eqr:AmortizationOfDeferredFinancingCostsOtherAssets
dei:LegalEntity

eqr:AmortizationOfDeferredSettlementsOnDerivativeInstrumentsOtherLiabilities
dei:LegalEntity

eqr:AmortizationOfDiscountsAndPremiumsOnDebtMortgageNotesPayable
dei:LegalEntity
us-gaap:DebtInstrument, us-gaap:LongtermDebtType
us-gaap:LongtermDebtType

eqr:AmortizationOfDiscountsAndPremiumsOnDebtNotesNet
dei:LegalEntity
us-gaap:DebtInstrument, us-gaap:LongtermDebtType
us-gaap:PartnerTypeOfPartnersCapitalAccount, dei:LegalEntity
eqr:ChangeInCarryingValueOfRedeemableLimitedPartners

eqr:CostOfPropertyManagement
dei:LegalEntity

eqr:DebtFinancingCostsOtherAssets
dei:LegalEntity

eqr:DilutiveOpUnits

eqr:DilutiveSecuritiesOptions
dei:LegalEntity

eqr:DisposedProperties
us-gaap:PropertyPlantAndEquipmentByType

eqr:DisposedUnits
us-gaap:PropertyPlantAndEquipmentByType
dei:LegalEntity
eqr:DividendsPreferenceUnits
us-gaap:PartnerTypeOfPartnersCapitalAccount, dei:LegalEntity
eqr:ExchangeOfOPUnitsBetweenLimitedPartnerAndGeneralPartner
us-gaap:PartnerTypeOfPartnersCapitalAccount, dei:LegalEntity
eqr:GeneralPartnerDistribution

eqr:IncomeLossFromEquityMethodInvestmentsMerger
dei:LegalEntity

eqr:IncreaseDecreaseInLeaseLiabilities
dei:LegalEntity

eqr:InvestmentsInUnconsolidatedEntities
dei:LegalEntity

eqr:InvestmentsInUnconsolidatedEntitiesOtherLiabilities
dei:LegalEntity
us-gaap:PartnerTypeOfPartnersCapitalAccount, dei:LegalEntity
eqr:IssuanceOfLongTermIncentivePlanUnitsIntoNoncontrollingInterest
us-gaap:StatementEquityComponents

eqr:IssuanceOfLtips
dei:LegalEntity

eqr:LimitedPartnersChangeInCarryingValue

eqr:LimitedPartnersChangeInRedemptionValue
us-gaap:PartnerTypeOfPartnersCapitalAccount, dei:LegalEntity
eqr:LimitedPartnersRedemptions

eqr:MinorityInterestChangeInCarryingValue
us-gaap:StatementEquityComponents
us-gaap:PartnerTypeOfPartnersCapitalAccount, dei:LegalEntity
eqr:MinorityInterestIncreaseFromContributionsByNoncontrollingInterestsPartiallyOwnedProperties
us-gaap:StatementEquityComponents
dei:LegalEntity
eqr:NetIncomeLossAvailableToOpUnitholdersBasicDilutedNumerator

eqr:NonRealEstateCapitalAdditions
dei:LegalEntity

eqr:OperatingAndFinanceLeaseRightOfUseAssetAmortization
dei:LegalEntity

eqr:OperatingLeaseLeaseIncomeLoss
us-gaap:ProductOrService
us-gaap:ProductOrService, us-gaap:TypeOfArrangement
us-gaap:TypeOfArrangement

eqr:OtherLiabilitiesLossFromInvestmentsInUnconsolidatedEntitiesMerger
dei:LegalEntity

eqr:PaymentsForCapitalExpendituresToRealEstate
dei:LegalEntity

eqr:PaymentsOfInterestCapitalizedForRealEstateUnderDevelopment
dei:LegalEntity
us-gaap:TypeOfArrangement
eqr:PercentageOfRentalIncome
us-gaap:StatementEquityComponents
eqr:PreferredStockPreferenceUnitsDividendRatePercentage

eqr:ProceedsFromSaleOfProperty
us-gaap:PropertyPlantAndEquipmentByType

eqr:RepaymentsOfMortgageNotesPayable
dei:LegalEntity

eqr:RestrictedShareGrantsNet
dei:LegalEntity

eqr:SharesIssuedDuringPeriodSharesConversionOfUnitsToCommonShares
dei:LegalEntity
us-gaap:PartnerTypeOfPartnersCapitalAccount, dei:LegalEntity
eqr:SupplementalExecutiveRetirementPlanSerp
us-gaap:StatementEquityComponents
us-gaap:PartnerTypeOfPartnersCapitalAccount, dei:LegalEntity
eqr:UnitsLimitedPartnersDistributions

eqr:UnrealizedGainLossOnDerivativeInstrumentsOtherLiabilities
dei:LegalEntity

eqr:WriteOffOfPursuitCostsAccountsPayableAndAccruedExpenses
dei:LegalEntity

eqr:WriteOffOfPursuitCostsOtherAssets
dei:LegalEntity

eqr:WriteOffPursuitCostsInvestmentInRealEstate
dei:LegalEntity
us-gaap:PartnerTypeOfPartnersCapitalAccount, dei:LegalEntity
us-gaap:AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationEmployeeStockPurchaseProgramRequisiteServicePeriodRecognition
us-gaap:StatementEquityComponents
us-gaap:PartnerTypeOfPartnersCapitalAccount, dei:LegalEntity
us-gaap:AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationRestrictedStockUnitsRequisiteServicePeriodRecognition
us-gaap:StatementEquityComponents
us-gaap:PartnerTypeOfPartnersCapitalAccount, dei:LegalEntity
us-gaap:AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationStockOptionsRequisiteServicePeriodRecognition
us-gaap:StatementEquityComponents
us-gaap:PartnerTypeOfPartnersCapitalAccount, dei:LegalEntity
us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationOtherLongtermIncentivePlansRequisiteServicePeriodRecognition
us-gaap:StatementEquityComponents

us-gaap:AmortizationOfAboveAndBelowMarketLeases
dei:LegalEntity

us-gaap:AmortizationOfDebtDiscountPremium
dei:LegalEntity

us-gaap:AmortizationOfDeferredHedgeGains
dei:LegalEntity

us-gaap:AmortizationOfFinancingCosts
dei:LegalEntity

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect
dei:LegalEntity
us-gaap:StatementEquityComponents
us-gaap:CommonStockDividendsPerShareDeclared

us-gaap:CostOfPropertyRepairsAndMaintenance
dei:LegalEntity
us-gaap:StatementBusinessSegments

us-gaap:Depreciation
dei:LegalEntity

us-gaap:DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet
us-gaap:DerivativeInstrumentRisk

us-gaap:DistributionMadeToLimitedPartnerCashDistributionsPaid
dei:LegalEntity
us-gaap:PartnerTypeOfPartnersCapitalAccount
us-gaap:DistributionsPerLimitedPartnershipAndGeneralPartnershipUnitOutstandingBasic
us-gaap:StatementEquityComponents
us-gaap:DividendsCommonStockCash

us-gaap:DividendsPreferredStock
us-gaap:StatementEquityComponents
us-gaap:DividendsPreferredStockCash

us-gaap:EquityMethodInvestmentDividendsOrDistributions
dei:LegalEntity

us-gaap:GainLossOnSaleOfDerivatives
dei:LegalEntity

us-gaap:GainsLossesOnSalesOfInvestmentRealEstate
dei:LegalEntity

us-gaap:IncomeLossAttributableToNoncontrollingInterest

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
dei:LegalEntity

us-gaap:IncomeLossFromEquityMethodInvestments
dei:LegalEntity
dei:LegalEntity
us-gaap:IncomeLossIncludingPortionAttributableToNoncontrollingInterest

us-gaap:IncreaseDecreaseInAccountsPayableAndAccruedLiabilities
dei:LegalEntity

us-gaap:IncreaseDecreaseInInterestPayableNet
dei:LegalEntity

us-gaap:IncreaseDecreaseInOtherOperatingAssets
dei:LegalEntity

us-gaap:IncreaseDecreaseInOtherOperatingLiabilities
dei:LegalEntity

us-gaap:IncreaseDecreaseInSecurityDeposits
dei:LegalEntity

us-gaap:InterestAndOtherIncome
dei:LegalEntity

us-gaap:InterestPaidNet
dei:LegalEntity

us-gaap:MinorityInterestChangeInRedemptionValue
us-gaap:StatementEquityComponents
us-gaap:PartnerTypeOfPartnersCapitalAccount, dei:LegalEntity
us-gaap:MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders
us-gaap:StatementEquityComponents
dei:LegalEntity
us-gaap:NetIncomeLossAllocatedToGeneralPartners
us-gaap:PartnerTypeOfPartnersCapitalAccount, dei:LegalEntity
dei:LegalEntity
us-gaap:NetIncomeLossAllocatedToLimitedPartners
us-gaap:PartnerTypeOfPartnersCapitalAccount, dei:LegalEntity

us-gaap:NoncashProjectAbandonmentCosts
dei:LegalEntity

us-gaap:OperatingLeasesIncomeStatementLeaseRevenue
dei:LegalEntity
us-gaap:ProductOrService
us-gaap:StatementBusinessSegments
us-gaap:StatementGeographical, us-gaap:StatementBusinessSegments

us-gaap:OtherComprehensiveIncomeLossNetOfTax
dei:LegalEntity

us-gaap:OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax
dei:LegalEntity
us-gaap:PartnerTypeOfPartnersCapitalAccount, dei:LegalEntity
us-gaap:StatementEquityComponents

us-gaap:OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodBeforeTax
us-gaap:DerivativeInstrumentRisk

us-gaap:OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax
dei:LegalEntity
us-gaap:PartnerTypeOfPartnersCapitalAccount, dei:LegalEntity
us-gaap:StatementEquityComponents

us-gaap:OtherNonoperatingExpense
dei:LegalEntity

us-gaap:PaymentsForProceedsFromHedgeFinancingActivities
dei:LegalEntity

us-gaap:PaymentsOfDividendsCommonStock
dei:LegalEntity

us-gaap:PaymentsOfDividendsMinorityInterest
dei:LegalEntity

us-gaap:PaymentsOfDividendsPreferredStockAndPreferenceStock
dei:LegalEntity

us-gaap:PaymentsOfFinancingCosts
dei:LegalEntity

us-gaap:PaymentsToAcquireEquityMethodInvestments
dei:LegalEntity

us-gaap:PaymentsToAcquireOtherInvestments
dei:LegalEntity

us-gaap:PaymentsToAcquireOtherPropertyPlantAndEquipment
us-gaap:StatementBusinessSegments
us-gaap:StatementGeographical, us-gaap:StatementBusinessSegments

us-gaap:PaymentsToDevelopRealEstateAssets
dei:LegalEntity

us-gaap:PreferredStockDividendsIncomeStatementImpact

us-gaap:ProceedsFromIssuanceOfCommercialPaper
dei:LegalEntity

us-gaap:ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlans
dei:LegalEntity

us-gaap:ProceedsFromLinesOfCredit
dei:LegalEntity

us-gaap:ProceedsFromMinorityShareholders
dei:LegalEntity

us-gaap:ProceedsFromOtherOperatingActivities
dei:LegalEntity

us-gaap:ProceedsFromPartnershipContribution
dei:LegalEntity

us-gaap:ProceedsFromSaleOfRealEstateHeldforinvestment
dei:LegalEntity

us-gaap:ProceedsFromSecuredNotesPayable
dei:LegalEntity
us-gaap:DebtInstrument, us-gaap:LongtermDebtType
us-gaap:LongtermDebtType

us-gaap:ProceedsFromStockOptionsExercised
dei:LegalEntity

us-gaap:RealEstateTaxesAndInsurance
dei:LegalEntity
us-gaap:StatementBusinessSegments

us-gaap:RepaymentsOfCommercialPaper
dei:LegalEntity

us-gaap:RepaymentsOfLinesOfCredit
dei:LegalEntity

us-gaap:StockIssuedDuringPeriodSharesConversionOfUnits

us-gaap:StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans
dei:LegalEntity

us-gaap:StockIssuedDuringPeriodSharesStockOptionsExercised
dei:LegalEntity
us-gaap:StatementEquityComponents
us-gaap:StockIssuedDuringPeriodValueConversionOfUnits
us-gaap:PartnerTypeOfPartnersCapitalAccount
us-gaap:StockIssuedDuringPeriodValueEmployeeStockPurchasePlan
us-gaap:StatementEquityComponents
us-gaap:PartnerTypeOfPartnersCapitalAccount, dei:LegalEntity
us-gaap:StockIssuedDuringPeriodValueStockOptionsExercised
us-gaap:StatementEquityComponents

us-gaap:UnrealizedGainLossOnInterestRateCashFlowHedgesPretaxAccumulatedOtherComprehensiveIncomeLoss
dei:LegalEntity
us-gaap:WeightedAverageLimitedPartnershipAndGeneralPartnershipUnitsOutstandingBasic

eqr:AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrentOtherThanInterestAndDividendPayable
dei:LegalEntity

eqr:CommonSharesAndUnitsOutstanding
dei:LegalEntity

eqr:DepreciableProperty
dei:LegalEntity

eqr:EscrowDepositsForMortgageAndReplacementReserves

eqr:FairValueOfSerpInvestments
us-gaap:FairValueByFairValueHierarchyLevel
us-gaap:PropertyPlantAndEquipmentByType
eqr:LandUnderDevelopment

eqr:LineOfCreditAndCommercialPaper
dei:LegalEntity

eqr:NoncontrollingInterestsPartiallyOwnedProperties
dei:LegalEntity

eqr:NumberOfUnitsInSameStoreProperties

eqr:OperatingAndFinanceLeaseLiability
dei:LegalEntity

eqr:OperatingAndFinanceLeaseRightOfUseAsset
dei:LegalEntity

eqr:OtherRestrictedCash
us-gaap:PartnerTypeOfPartnersCapitalAccount, dei:LegalEntity
eqr:PartnersCapitalAttributableToParent

eqr:PropertiesContractedToBeDisposed
us-gaap:DisposalGroupClassification, us-gaap:RealEstateProperties
us-gaap:DisposalGroupClassification, us-gaap:RealEstateProperties, us-gaap:SubsequentEventType
us-gaap:SubsequentEventType

eqr:RedeemableLimitedPartners
dei:LegalEntity

eqr:RedeemableNoncontrollingInterestsOperatingPartnership
us-gaap:FairValueByFairValueHierarchyLevel

eqr:ResidentSecurityAndUtilityDeposits

eqr:RestrictedDepositsOnRealEstateInvestments

eqr:SalesPriceForCommitmentsToDispose
us-gaap:DisposalGroupClassification, us-gaap:RealEstateProperties
us-gaap:DisposalGroupClassification, us-gaap:RealEstateProperties, us-gaap:SubsequentEventType
us-gaap:PropertyPlantAndEquipmentByType
us-gaap:PropertyPlantAndEquipmentByType, us-gaap:SubsequentEventType
us-gaap:SubsequentEventType

eqr:UnitsContractedToBeDisposed
us-gaap:DisposalGroupClassification, us-gaap:RealEstateProperties
us-gaap:DisposalGroupClassification, us-gaap:RealEstateProperties, us-gaap:SubsequentEventType
us-gaap:SubsequentEventType

eqr:UnitsOutstanding
dei:LegalEntity

eqr:UnitsOwnershipInterestInOperatingPartnership
dei:LegalEntity

us-gaap:AdditionalPaidInCapital

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations
dei:LegalEntity

us-gaap:CommercialPaper
us-gaap:CreditFacility

us-gaap:DebtInstrumentCumulativeSinkingFundPayments
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis
us-gaap:DebtInstrumentFairValue
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis, us-gaap:LongtermDebtType
us-gaap:FairValueByMeasurementBasis
us-gaap:FairValueByMeasurementBasis, us-gaap:LongtermDebtType
us-gaap:CreditFacility
us-gaap:DebtWeightedAverageInterestRate
us-gaap:DebtInstrument
us-gaap:LongtermDebtType
us-gaap:Range, us-gaap:DerivativeInstrumentRisk
us-gaap:DerivativeFixedInterestRate
us-gaap:DerivativeInstrumentRisk
us-gaap:DerivativeLiabilities
us-gaap:DerivativeInstrumentRisk, us-gaap:FairValueByFairValueHierarchyLevel

us-gaap:DevelopmentInProcess
dei:LegalEntity
us-gaap:PropertyPlantAndEquipmentByType

us-gaap:DividendsPayableCurrentAndNoncurrent
dei:LegalEntity

us-gaap:EquityMethodInvestments
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName, us-gaap:VariableInterestEntitiesByClassificationOfEntity

us-gaap:FiniteLivedIntangibleAssetAcquiredInPlaceLeases

us-gaap:FixturesAndEquipmentGross
dei:LegalEntity
us-gaap:GeneralPartnersCapitalAccount

us-gaap:InterestPayableCurrentAndNoncurrent
dei:LegalEntity

us-gaap:InvestmentBuildingAndBuildingImprovements

us-gaap:LandAvailableForDevelopment
dei:LegalEntity
us-gaap:PropertyPlantAndEquipmentByType

us-gaap:LiabilitiesFairValueDisclosure
us-gaap:FairValueByFairValueHierarchyLevel
dei:LegalEntity
us-gaap:LimitedPartnersCapitalAccount
us-gaap:CreditFacility
us-gaap:LineOfCreditFacilityMaximumBorrowingCapacity

us-gaap:MinorityInterestInOperatingPartnerships

us-gaap:NotesPayable
dei:LegalEntity
us-gaap:DebtInstrument, us-gaap:LongtermDebtType

us-gaap:NumberOfRealEstateProperties
us-gaap:ConsolidatedEntities
us-gaap:RealEstateProperties

us-gaap:NumberOfUnitsInRealEstateProperty
us-gaap:ConsolidatedEntities
us-gaap:RealEstateProperties

us-gaap:OtherAssets
dei:LegalEntity

us-gaap:OtherLiabilities
dei:LegalEntity

us-gaap:OtherLiabilitiesFairValueDisclosure
us-gaap:FairValueByFairValueHierarchyLevel
dei:LegalEntity
us-gaap:PartnersCapital
us-gaap:PartnerTypeOfPartnersCapitalAccount, dei:LegalEntity
us-gaap:PartnersCapitalAttributableToNoncontrollingInterest
dei:LegalEntity
us-gaap:PartnersCapitalIncludingPortionAttributableToNoncontrollingInterest

us-gaap:PreferredStockSharesIssued

us-gaap:PreferredStockSharesOutstanding

us-gaap:PreferredStockValue
dei:LegalEntity
us-gaap:PreferredUnitsPreferredPartnersCapitalAccounts

us-gaap:RealEstateInvestmentPropertyAccumulatedDepreciation
dei:LegalEntity

us-gaap:RealEstateInvestmentPropertyAtCost
dei:LegalEntity

us-gaap:RealEstateInvestmentPropertyNet
dei:LegalEntity

us-gaap:RedeemableNoncontrollingInterestEquityCarryingAmount

us-gaap:ReplacementReserveEscrow

us-gaap:RestrictedCash

us-gaap:RestrictedCashAndCashEquivalents
dei:LegalEntity

us-gaap:SecuredDebt
dei:LegalEntity
us-gaap:DebtInstrument, us-gaap:LongtermDebtType
us-gaap:LongtermDebtType

us-gaap:SecurityDepositLiability
dei:LegalEntity

us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest

Tables

  2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-312009-06-302009-03-31
us-gaap:CommonStockValue ███████████████████████████████▁▁▁▁▁▁3333333333333333333333333333333222222NANA
us-gaap:CommonStockSharesIssued █████████████▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▃▂▂▂▂▂▁▁▁372371371370370369368368368368367367367365365365365364364364363362362361361360360360302300300296296294283283282NANA
us-gaap:CommonStockSharesOutstanding █████████████▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▃▂▂▂▂▂▁▁▁372371371370370369368368368368367367367365365365365364364364363362362361361360360360302300300296296294283283282NANA
us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding 386NA386386385NA383383383NA382382382NA382382382NA380380380NA377377376359359337318317315312312310300299280289288
 us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding dei:LegalEntity eqr:ERPOP386NA386386385NA383383383NA382382382NA382382382NA380380380NA377NANANANANANANANANANANANANANANANA
us-gaap:WeightedAverageNumberOfSharesOutstandingBasic 371NA370370369NA368367367NA366366366NA365365364NA363363363NA361360360359359337301300298295294292282282280272272
us-gaap:EarningsPerShareBasic ▂▂▁▂▁▁▁▁▁▁▁▁▁▂▁▁█▁▁▂▁▁▁▁▁▂▂▃▂▁▁▁▂▁▁▁▁▁▁0.830.77999999999999980.720.830.280.320000000000000060.580.310.570.339999999999999860.370.530.390.750.570.69.840.550.540.790.4930.5990.6110.3090.2171.0450.93.0120.7250.3320.4750.351.8750.420.0890.0220.180.3540.28
 us-gaap:EarningsPerShareBasic dei:LegalEntity eqr:ERPOP▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁█▁▁▁▁▁▁0.830.77999999999999980.720.830.280.320000000000000060.580.310.570.339999999999999860.370.530.390.750.570.69.840.550.540.790.490.60000000000000010.61NANANANANANANANANANANANANANANANA
us-gaap:EarningsPerShareDiluted ▂▂▁▂▁▁▁▁▁▁▁▁▁▂▁▁█▁▁▂▁▁▁▁▁▂▂▃▂▁▁▁▂▁▁▁▁▁▁0.830.780.710.830.280.310000000000000050.580.310.570.339999999999999860.370.530.390.75999999999999980.560.599.760.55999999999999980.530.780.4890.5950.6070.3080.2161.0450.93.0120.7190.3290.470.351.8520.420.0880.0220.180.3540.28
 us-gaap:EarningsPerShareDiluted dei:LegalEntity eqr:ERPOP▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁█▁▁▁▁▁▁0.830.780.710.830.280.310000000000000050.580.310.570.339999999999999860.370.530.390.75999999999999980.560.599.760.55999999999999980.530.780.490.60000000000000010.61NANANANANANANANANANANANANANANANA
  2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-312009-06-302009-03-31
us-gaap:RevenueFromContractWithCustomerIncludingAssessedTax ▆▆▆▆▆▆▆▆▆▁███▁█████████████████▇▇▇▇▇▇▇▇000000000-1839624612604-1816606595619703696679666664664652633629635539556543527511498520453510488480483
 us-gaap:RevenueFromContractWithCustomerIncludingAssessedTax dei:LegalEntity eqr:ERPOP▁▁▁▆█████24000.024000.025000.0143000.0192000.0190000.0190000.0188000.0185000.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:Revenues ▇▇▇▇▇▇▇▆▆▆▆▅▅▅▅▅▆██▇▇▇▇▇▆▆▆▃▄▄▃▃▂▃▁▃▂▂▂682683685669662652652639633630624612604605606595619703696679666664664652633629635539556543527511498520453510488480483
 us-gaap:Revenues dei:LegalEntity eqr:ERPOP▇▇▇▆▅▅▅▄▃▃▃▂▂▂▂▁▃██▆▆▅▅682683685669662652652639633630624612604605606595619703696679666664664NANANANANANANANANANANANANANANANA
 us-gaap:OperatingExpenses us-gaap:StatementBusinessSegments eqr:NonSameStoreAndOther▃█▁▃▄▆▄▄▅▅▄▅▄▅▄▃█132951315211515192014191718141328NANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:OperatingExpenses us-gaap:StatementBusinessSegments eqr:SameStore█▄█▆▇▄▅▄▅▂▄▃▃▁▃▂▂199174196186191174182177180160173167167156171160161NANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:OperatingExpenses us-gaap:StatementBusinessSegments eqr:SameStoreNonSameStoreAndOther█▆▆▆▇▅▅▄▆▂▄▃▃▁▃▁▄213204202199206195197193200180188186184175185173189NANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:OperatingExpenses us-gaap:StatementGeographical,us-gaap:StatementBusinessSegments eqr:Boston,eqr:SameStore█▃▄▃█▁▄▃1815161518141615NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:OperatingExpenses us-gaap:StatementGeographical,us-gaap:StatementBusinessSegments eqr:Denver,eqr:SameStore1NANANA1NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:OperatingExpenses us-gaap:StatementGeographical,us-gaap:StatementBusinessSegments eqr:LosAngeles,eqr:SameStore█▄█▄█▄▅▁3633363336333431NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:OperatingExpenses us-gaap:StatementGeographical,us-gaap:StatementBusinessSegments eqr:NonSameStore,eqr:NonSameStoreAndOther▄█▄▅▁▅▁▃91891111126NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:OperatingExpenses us-gaap:StatementGeographical,us-gaap:StatementBusinessSegments eqr:OrangeCounty,eqr:SameStore█▁█▁████65656666NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:OperatingExpenses us-gaap:StatementGeographical,us-gaap:StatementBusinessSegments eqr:Other,eqr:NonSameStoreAndOther▄▆▁▃▆█▄▅410-3191456NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:OperatingExpenses us-gaap:StatementGeographical,us-gaap:StatementBusinessSegments eqr:SanDiego,eqr:SameStore███▁███▁66656665NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:OperatingExpenses us-gaap:StatementGeographical,us-gaap:StatementBusinessSegments eqr:SanFrancisco,eqr:SameStore▆▃█▄▄▁▆▃3028312929273028NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:OperatingExpenses us-gaap:StatementGeographical,us-gaap:StatementBusinessSegments eqr:Seattle,eqr:SameStore█▃▆▄█▁▆▄1714161517131615NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:OperatingExpenses us-gaap:StatementGeographical,us-gaap:StatementBusinessSegments eqr:SouthernCalifornia,eqr:SameStore█▃█▃▇▃▆▁4945494548454743NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:OperatingExpenses us-gaap:StatementGeographical,us-gaap:StatementBusinessSegments stpr:DC,eqr:SameStore▇▂██▆▁█▇3223343431223433NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:OperatingExpenses us-gaap:StatementGeographical,us-gaap:StatementBusinessSegments stpr:NY,eqr:SameStore█▄▆▄▆▃▃▁5046484648454543NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:CostsAndExpenses ▅▄▄▄▄▄▄▃▄▃▃▃▃▂▃▂▃▃▄▄▄▃▃▃▄▆█▃▂▂▂▁▁▂▃▂▂▁▁468453447439452433428422436415406401399381396389402416438432448414420424434508564421372378381360351387400389370353350
 us-gaap:CostsAndExpenses dei:LegalEntity eqr:ERPOP█▇▆▆▇▅▅▄▅▄▃▃▂▁▂▂▃▄▆▅▆▄▄468453447439452433428422436415406401399381396389402416438432448414420NANANANANANANANANANANANANANANANA
us-gaap:GeneralAndAdministrativeExpense ▄▂▂▄▅▃▃▃▆▂▃▄▄▂▃▇▆▄▅▅█▁▁▄▇▄▆▆▂▄▄▂▂▂▂▂▂▂▂1411111415121212161112131410121816141515199913171416161013131010111010101010
 us-gaap:GeneralAndAdministrativeExpense dei:LegalEntity eqr:ERPOP▄▂▂▄▅▃▃▃▆▂▃▄▄▂▃▇▆▄▅▅█▁▁14111114151212121611121314101218161415151999NANANANANANANANANANANANANANANANA
us-gaap:OperatingIncomeLoss ██▇▇▄▄▄▄▃▄▄▄▄▄▄▄▄▅▅▄▄▅▄▄▄▂▁▂▃▃▂▃▂▂▂▂▂▂▂42240836836920921922421719621421721020422420920621628625724621825024322819912171117184165146151146133127121118126132
 us-gaap:OperatingIncomeLoss dei:LegalEntity eqr:ERPOP██▆▆▁▂▂▂▁▂▂▁▁▂▁▁▂▄▃▃▂▃▂422408368369209219224217196214217210204224209206216286257246218250243NANANANANANANANANANANANANANANANA
 us-gaap:OperatingIncomeLoss us-gaap:StatementBusinessSegments eqr:SameStore▇▅█▇▆▅▅▅▄▃▄▃▂▂▃▃▁448420453444431421423421410403413404392395403399384NANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:OperatingIncomeLoss us-gaap:StatementBusinessSegments eqr:SameStoreNonSameStoreAndOther▆██▇▅▅▅▄▂▄▃▂▁▂▁▁▂468479482469455456454446432449435425419429420421426NANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:OperatingIncomeLoss us-gaap:StatementGeographical,us-gaap:StatementBusinessSegments eqr:Boston,eqr:SameStore█▄▅▄▅▁▁▁4542434243404040NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:OperatingIncomeLoss us-gaap:StatementGeographical,us-gaap:StatementBusinessSegments eqr:LosAngeles,eqr:SameStore█▇█▆▆▃▇▁8584858383818479NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:OperatingIncomeLoss us-gaap:StatementGeographical,us-gaap:StatementBusinessSegments eqr:SanFrancisco,eqr:SameStore▄▄█▇▁▂▄▂9191959488899189NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:OperatingIncomeLoss us-gaap:StatementGeographical,us-gaap:StatementBusinessSegments eqr:Seattle,eqr:SameStore█▂▆▄▆▁▅▂4738444044364238NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:OperatingIncomeLoss us-gaap:StatementGeographical,us-gaap:StatementBusinessSegments eqr:SouthernCalifornia,eqr:SameStore███▆▄▄▅▁123123123121119118120115NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:OperatingIncomeLoss us-gaap:StatementGeographical,us-gaap:StatementBusinessSegments stpr:DC,eqr:SameStore▆▁▇█▅▁▇▇7158767869577476NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:OperatingIncomeLoss us-gaap:StatementGeographical,us-gaap:StatementBusinessSegments stpr:NY,eqr:SameStore▁▃█▄▁▃█▄6566696765666967NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:InterestExpenseDebt ▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇█▇▇▇▇▁▇▇▇▇▇█▇▇▇▇▇▇▇▇▇▇▇8510085108949111194116959191106958686213110114110108-804118115113120122195113115118113120121122115115115123
 us-gaap:InterestExpenseDebt dei:LegalEntity eqr:ERPOP▁▂▁▂▁▁▂▁▃▂▁▁▂▂▁▁█▂▃▂▂▂▃8510085108949111194116959191106958686213110114110108109118NANANANANANANANANANANANANANANANA
us-gaap:IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest ▂▂▂▂▁▁▂▁▂▂▂▂▂▂▂▂█▂▂▂▂▂▁▁▁▁▁▁▂▁▁▁▁▁▁▁▁▁▁332301277321109122223118220130144204149301217228373121320529819035511710281-12-51-153132361735217199-21212
 us-gaap:IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest dei:LegalEntity eqr:ERPOP▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁█▁▁▁▁▁▁3323012773211091222231182201301442041493012172283731213205298190226231NANANANANANANANANANANANANANANANA
us-gaap:IncomeTaxExpenseBenefit ▅▁▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅█0-30000000000000000000000000000000000002
 us-gaap:IncomeTaxExpenseBenefit dei:LegalEntity eqr:ERPOP█▁█████████████████████0-3000000000000000000000NANANANANANANANANANANANANANANANA
us-gaap:IncomeTaxesPaidNet █▁███████████████████████0-100000000000000000000000NANA0NANA0000NANA-1NA0
 us-gaap:IncomeTaxesPaidNet dei:LegalEntity eqr:ERPOP█▁████████████████████0-100000000000000000000NANANANANANANANANANANANANANANANANA
us-gaap:ProfitLoss ▂▂▂▂▁▁▁▁▁▁▁▁▁▂▁▁█▁▁▂▁▁▁▁▁▂▂▃▁▁▁▁▂▁▁▁▁▁▁332301277321109122223118220130144204149302217228373121320529819022723111782391336106123610815211258113329105710585
 us-gaap:ProfitLoss dei:LegalEntity eqr:ERPOP▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁█▁▁▁▁▁▁3323012773211091222231182201301442041493022172283731213205298190227231NANANANANANANANANANANANANANANANA
us-gaap:ComprehensiveIncomeNetOfTax ▂▂▂▂▁▁▂▁▂▁▁▂▁▂▂▂█▂▂▂▁▂▂▁▁▂▂▃▂▁▁▁▂▁▁▁▁▁▁313296272294941032301232221311442031482812122213612209203301174210223108713743401028226951523526134-8-614210787
 us-gaap:ComprehensiveIncomeNetOfTax dei:LegalEntity eqr:ERPOP▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁█▁▁▁▁▁▁324306282305981072391282301361492111532932212303756217211313181218232NANANANANANANANANANANANANANANANA
us-gaap:ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest ▂▂▁▂▁▁▁▁▁▁▁▁▁▂▁▁█▁▁▂▁▁▁▁▁▂▂▃▁▁▁▁▂▁▁▁▁▁▁2411101144959468625991459912799431411431056525510254
 us-gaap:ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest dei:LegalEntity eqr:ERPOP▇▁▁▁▁▁▁▁▁▁▁▁▁█▁▁▁▂▁▁▁▁▁1200000000000014000100000NANANANANANANANANANANANANANANANA
us-gaap:ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest ▂▂▂▂▁▁▂▁▂▁▁▂▁▂▂▂█▂▂▂▁▂▂▁▁▂▂▃▂▁▁▁▂▁▁▁▁▁▁3373072833069910824012823113615021215430722223137572182123141822192331137538935210712361001588551140-6-614411291
 us-gaap:ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest dei:LegalEntity eqr:ERPOP▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁█▁▁▁▁▁▁337307283306991082401282311361502121543072222313757218212314182219233NANANANANANANANANANANANANANANANA
us-gaap:NetIncomeLoss ▂▂▂▂▁▁▁▁▁▁▁▁▁▂▁▁█▁▁▂▁▁▁▁▁▂▂▃▁▁▁▁▂▁▁▁▁▁▁30828926730810411721411321112513819614327720821835872041962861822172211127937732410172261031451075551272895510080
 us-gaap:NetIncomeLoss dei:LegalEntity eqr:ERPOP▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁█▁▁▁▁▁▁3203002773201081212231172191301432031492882162273731212204297189226230NANANANANANANANANANANANANANANANA
 us-gaap:NetIncomeLoss us-gaap:StatementEquityComponents us-gaap:RetainedEarnings▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁█▁▁▁▁▁▁▁▁308289267308104117214113211125138196143277208218358720419628618221722111279NANA1017NANA145107555127NANA55NANA
us-gaap:NetIncomeLossAvailableToCommonStockholdersBasic ▂▂▂▂▁▁▁▁▁▁▁▁▁▂▁▁█▁▁▂▁▁▁▁▁▂▂▃▁▁▁▁▂▁▁▁▁▁▁307288266308103116214112211124137195142276207218358620219528517821622011178376323101621899141104552123256519677
us-gaap:NetIncomeLossAvailableToCommonStockholdersDiluted ▂▂▂▂▁▁▁▁▁▁▁▁▁▂▁▁█▁▁▂▁▁▁▁▁▂▂▃▁▁▁▁▂▁▁▁3192992763191071202221172191291422021482872152263730211203296185225229116813763231016229104148109578123256NANANA
us-gaap:NetIncomeLossAttributableToNoncontrollingInterest ▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁█▁▁▁▁▁▁▁▁▂▁▃▁1110911348484575118814387117884314124310NANANANANANANA2NANA
 us-gaap:NetIncomeLossAttributableToNoncontrollingInterest us-gaap:StatementEquityComponents eqr:PartiallyOwned█▁▁▁▁▁▁▁▁▁▁▁▁12000000000000NANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:NetIncomeLossAttributableToNoncontrollingInterest us-gaap:StatementEquityComponents us-gaap:NoncontrollingInterest▃▃▃▃▃▃▃▃▃▃▃▃▃█▃▃▁▄1110911348484575331-8-8-14360NANANANANANANANANANANANANANANANANANANANANA
  2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-312009-06-302009-03-31
us-gaap:Assets ▆▆▆▆▅▅▅▅▅▅▅▅▅▅▆▆▆▇▇▇▇▇▇▇▇███▂▂▂▁▂▁▁▁▁20919211722105420990207682039420542204062038320570206972063620608207042129721229213012315723008230812302922950230082299122889238112348223795166681671416481157561639816075160861562515518NANA
us-gaap:Liabilities ▂▃▃▃▂▂▂▁▁▂▂▂▂▂▃▁▁▆▆▆▆▆▆▆▆▇▇█▂▃▂▁▂▃▄▃▂9795101641015210175100699615969396009504972998239730973398011051793449471118941178111748118131174211860119221176412512124351297310040101571000595231008410256108651031510075NANA
 us-gaap:Liabilities dei:LegalEntity eqr:ERPOP▂▃▃▃▃▂▂▂▁▂▂▂▂▂▄▁▁██97951016410152101751006996159693960095049729982397309733980110517934494711189411781NANA11742NANANANANANANANANANANANANANANANANA
us-gaap:LiabilitiesAndStockholdersEquity ▆▆▆▆▅▅▅▅▅▅▅▅▅▅▆▆▆▇▇▇▇▇▇▇▇███▂▂▂▁▂▁▁▁▁20919211722105420990207682039420542204062038320570206972063620608207042129721229213012315723008230812302922950230082299122889238112348223795166681671416481157561639816075160861562515518NANA
 us-gaap:LiabilitiesAndStockholdersEquity dei:LegalEntity eqr:ERPOP▂▃▃▃▂▁▁▁▁▁▂▂▂▂▃▃▃██20919211722105420990207682039420542204062038320570206972063620608207042129721229213012315723008NANA22950NANANANANANANANANANANANANANANANANA
us-gaap:StockholdersEquity ▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇██▇▇▇▇▇▇▇▇▇▇▇▂▂▂▂▂▂▁▁▁10530103151018210153100461017310235102081028910242102591029010280102291011511160110631047010478105001033110368103781028910376105981032210123599058855822573557505278474848775021NANA
 us-gaap:StockholdersEquity us-gaap:StatementEquityComponents us-gaap:AdditionalPaidInCapital█████████████▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▁▁909289658917894989258935890089058910888688488838884687588741871886588572858486078539853685748527854185428496849253645226NANANANANANANANANA
 us-gaap:StockholdersEquity us-gaap:StatementEquityComponents us-gaap:RetainedEarnings▄▄▃▃▃▃▄▄▄▄▄▄▄▄▄██▆▆▆▆▆▆▆▆▇▆▅▁▁1469138613081252115512611344132914151403146415111501154314512524249020092007201219281950191518751944217119391759770654NANANANANANANANANA
  2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-312009-06-302009-03-31
us-gaap:CashAndCashEquivalentsAtCarryingValue ▁▁▁▃▁▁▁▁▁▁▁▁▁▁▅▄▄▁▁▁▁▁▁▁▁█▂▁▁▁▂▁▅▃▁▁▁▆▄82452825129473234445046374277517497368423792494031763797215256454421945604306434760667428
 us-gaap:CashAndCashEquivalentsAtCarryingValue dei:LegalEntity eqr:ERPOP▂▁▁▄▁▁▁▁▁▁▁▁▁▂██▆▁▁▂▁▁▁82452825129473234445046374277517497368423792494031NANANANANANANANANANANANANANANANA
us-gaap:Land ▆▇▇▆▇▆▆▇▇▇▇▇▇▇▆▆▆▆███████▇██▃▃▂▂▂▁▁▁▁5883593659555889591858755866598659605996598559275902589958745835577758646424637463576295632962966281620162646319460945654384415841614107409340033948NANA
 us-gaap:Land dei:LegalEntity eqr:ERPOP▂▃▃▂▃▂▂▃▃▃▃▃▂▂▂▂▁▂█5883593659555889591858755866598659605996598559275902589958745835577758646424NANA6295NANANANANANANANANANANANANANANANANA
  2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-312009-06-302009-03-31
us-gaap:InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures ▃▃▃▃▃▃▃▃▃▃▃▃▃▃▃▃▃▃▄▄▄▅▅▆█▇▇█▂▂▁▁▁▁▁▁▁5552525262585758595859595960606566687494891051281422051651881931717141133025NANA
 us-gaap:InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures dei:LegalEntity eqr:ERPOP▂▁▁▁▄▃▃▃▃▃▃▃▃▄▄▅▅▆█55525252625857585958595959606065666874NANA105NANANANANANANANANANANANANANANANANA
  2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-312009-06-302009-03-31
  2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-312009-06-302009-03-31
us-gaap:MinorityInterest ▅▄▄▄▄▄▅▅▅▅▅▅▅▅▄▅▅▄▄██████▇▇▇▄▄▃▁▁▁▁▁▁240229224226219226231231235231234235235231223246244225226343342339339338342324316311223218196119125123115118125NANA
 us-gaap:MinorityInterest us-gaap:StatementEquityComponents us-gaap:NoncontrollingInterest▆▄▃▄▃▄▅▅▆▃▄▄▄▂▁██▂▂235227226227225228233232234226228229228221219241240221221NANA214NANANANANANANANANANANANANANANANANA
  2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-312009-06-302009-03-31
us-gaap:StockholdersEquity ▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇██▇▇▇▇▇▇▇▇▇▇▇▂▂▂▂▂▂▁▁▁10530103151018210153100461017310235102081028910242102591029010280102291011511160110631047010478105001033110368103781028910376105981032210123599058855822573557505278474848775021NANA
 us-gaap:StockholdersEquity us-gaap:StatementEquityComponents us-gaap:AdditionalPaidInCapital█████████████▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▁▁909289658917894989258935890089058910888688488838884687588741871886588572858486078539853685748527854185428496849253645226NANANANANANANANANA
 us-gaap:StockholdersEquity us-gaap:StatementEquityComponents us-gaap:RetainedEarnings▄▄▃▃▃▃▄▄▄▄▄▄▄▄▄██▆▆▆▆▆▆▆▆▇▆▅▁▁1469138613081252115512611344132914151403146415111501154314512524249020092007201219281950191518751944217119391759770654NANANANANANANANANA
us-gaap:CommonStockValue ███████████████████████████████▁▁▁▁▁▁3333333333333333333333333333333222222NANA
us-gaap:RetainedEarningsAccumulatedDeficit ▅▅▄▄▄▄▅▄▅▅▅▅▅▅▅██▆▆▆▆▆▆▆▆▇▆▆▃▂▂▃▃▁▁▁▁1469138613081252115512611344132914151403146415111501154314512524249020092007201219281950191518751944217119391759770654656684680228150220310NANA
us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax ▆▅▅▅▆▆▆▆▅▅▅▅▄▄▄▄▄▃▃▂▂▂▂▂▂▂▂▂▁▁▁▁▅▆▄▅█-72-77-84-89-75-64-50-67-77-88-94-101-109-113-118-123-126-152-157-163-180-172-164-166-162-169-166-182-197-198-189-185-80-50-116-79-8NANA
  2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-312009-06-302009-03-31
us-gaap:NetCashProvidedByUsedInOperatingActivities ▇▆█▅▇▅▆▅▆▄█▃▄▄▆▃▁▄▇▅▆▅▇▄▅382362403317373312358324361302413256293292344273201293388327347309394282336NANA193NANA235221204187NANA155NA142
 us-gaap:NetCashProvidedByUsedInOperatingActivities dei:LegalEntity eqr:ERPOP▇▆█▅▇▅▆▅▆▄█▃▄▄▆▃▁▄▇▅▆▅382362403317373312358324361302413256293292344273201293388327347309NANANANANANANANANANANANANANANANANA
us-gaap:NetCashProvidedByUsedInInvestingActivities ▂▁▁▁▁▁▁▁▂▁▁▁▁▂▁▂█▁▁▁▁▁▁▁▁266-113-289-22-347-108-184-231147-113-254-153-73119-1191205751-267-205-26-17911-160-190-304NANA-1041NANA-82-35442-38NANA-278NA-70
 us-gaap:NetCashProvidedByUsedInInvestingActivities dei:LegalEntity eqr:ERPOP▂▁▁▁▁▁▁▁▂▁▁▁▁▂▁▂█▁▁▁▁▁266-113-289-22-347-108-184-231147-113-254-153-73119-1191205751-267-205-26-1795NANANANANANANANANANANANANANANANANA
us-gaap:NetCashProvidedByUsedInFinancingActivities ▇███████▇████▇██▁████████-624-216-339-79-49-176-174-98-514-276-149-107-255-852-204-264-5626-20-237-258-159-312-278-52-48NANA291NANA-316-744-348-274NANA-10NA-534
  2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-312009-06-302009-03-31
us-gaap:NetCashProvidedByUsedInOperatingActivities ▇▆█▅▇▅▆▅▆▄█▃▄▄▆▃▁▄▇▅▆▅▇▄▅382362403317373312358324361302413256293292344273201293388327347309394282336NANA193NANA235221204187NANA155NA142
 us-gaap:NetCashProvidedByUsedInOperatingActivities dei:LegalEntity eqr:ERPOP▇▆█▅▇▅▆▅▆▄█▃▄▄▆▃▁▄▇▅▆▅382362403317373312358324361302413256293292344273201293388327347309NANANANANANANANANANANANANANANANANA
us-gaap:NetIncomeLoss ▂▂▂▂▁▁▁▁▁▁▁▁▁▂▁▁█▁▁▂▁▁▁▁▁▂▂▃▁▁▁▁▂▁▁▁▁▁▁30828926730810411721411321112513819614327720821835872041962861822172211127937732410172261031451075551272895510080
 us-gaap:NetIncomeLoss dei:LegalEntity eqr:ERPOP▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁█▁▁▁▁▁▁3203002773201081212231172191301432031492882162273731212204297189226230NANANANANANANANANANANANANANANANA
 us-gaap:NetIncomeLoss us-gaap:StatementEquityComponents us-gaap:RetainedEarnings▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁█▁▁▁▁▁▁▁▁308289267308104117214113211125138196143277208218358720419628618221722111279NANA1017NANA145107555127NANA55NANA
us-gaap:ProfitLoss ▂▂▂▂▁▁▁▁▁▁▁▁▁▂▁▁█▁▁▂▁▁▁▁▁▂▂▃▁▁▁▁▂▁▁▁▁▁▁332301277321109122223118220130144204149302217228373121320529819022723111782391336106123610815211258113329105710585
 us-gaap:ProfitLoss dei:LegalEntity eqr:ERPOP▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁█▁▁▁▁▁▁3323012773211091222231182201301442041493022172283731213205298190227231NANANANANANANANANANANANANANANANA
  2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-312009-06-302009-03-31
us-gaap:NetCashProvidedByUsedInInvestingActivities ▂▁▁▁▁▁▁▁▂▁▁▁▁▂▁▂█▁▁▁▁▁▁▁▁266-113-289-22-347-108-184-231147-113-254-153-73119-1191205751-267-205-26-17911-160-190-304NANA-1041NANA-82-35442-38NANA-278NA-70
 us-gaap:NetCashProvidedByUsedInInvestingActivities dei:LegalEntity eqr:ERPOP▂▁▁▁▁▁▁▁▂▁▁▁▁▂▁▂█▁▁▁▁▁266-113-289-22-347-108-184-231147-113-254-153-73119-1191205751-267-205-26-1795NANANANANANANANANANANANANANANANANA
  2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-312009-06-302009-03-31
us-gaap:NetCashProvidedByUsedInFinancingActivities ▇███████▇████▇██▁████████-624-216-339-79-49-176-174-98-514-276-149-107-255-852-204-264-5626-20-237-258-159-312-278-52-48NANA291NANA-316-744-348-274NANA-10NA-534
us-gaap:RepaymentsOfLongTermDebt 1NANANANANANANANANANANANANANANANA183NANANANANANANANANANANANANANANANANANANANANA
 us-gaap:RepaymentsOfLongTermDebt us-gaap:DebtInstrument,us-gaap:LongtermDebtType eqr:SecuredConventional,eqr:FixedRateDebt1NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
  2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-312009-06-302009-03-31
us-gaap:RepaymentsOfLongTermDebt 1NANANANANANANANANANANANANANANANA183NANANANANANANANANANANANANANANANANANANANANA
 us-gaap:RepaymentsOfLongTermDebt us-gaap:DebtInstrument,us-gaap:LongtermDebtType eqr:SecuredConventional,eqr:FixedRateDebt1NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA

Common Stock Value

us-gaap:CommonStockValue



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312008-12-31
Value3333333333333333333333333333333332222222222
Percentage of CommonStockValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Common Stock Par Or Stated Value Per Share

Common Stock Shares Issued

us-gaap:CommonStockSharesIssued



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312008-12-31
Value372371371370370369368368368368367367367365365365365364364364363362362361361360360360360325302300300297296296294290283283282279272
Percentage of CommonStockSharesIssued100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Common Stock Shares Outstanding

us-gaap:CommonStockSharesOutstanding



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312008-12-312007-12-31
Value372371371370370369368368368368367367367365365365365364364364363362362361361360360360360325302300300297296296294290283283282279272269
Percentage of CommonStockSharesOutstanding100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Common Stock Shares Authorized

Weighted Average Number Of Diluted Shares Outstanding

us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
Value386386386385383383383382382382382382382380380380377377376375359359337327318317315312312312310285300299280275290289288
Percentage of WeightedAverageNumberOfDilutedSharesOutstanding100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

eqr:ERPOP



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-30
Value386386386385383383383382382382382382382380380380377
Percentage of WeightedAverageNumberOfDilutedSharesOutstanding100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Weighted Average Number Of Shares Outstanding Basic

us-gaap:WeightedAverageNumberOfSharesOutstandingBasic



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
Value371370370369368367367366366366365365364363363363361360360359359359337310301300298295295294292285282282280275273272272
Percentage of WeightedAverageNumberOfSharesOutstandingBasic100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Earnings Per Share Basic

us-gaap:EarningsPerShareBasic



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
Value0.830.77999999999999980.720.830.280.320000000000000060.580.310.570.339999999999999860.370.530.390.750.570.69.840.550.540.790.4930.5990.6110.3090.2170.311.0450.93.0121.180.7250.3320.4750.330.351.8750.420.650.0890.0220.180.150.4840.3540.28
Percentage of EarningsPerShareBasic100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

eqr:ERPOP



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-30
Value0.830.77999999999999980.720.830.280.320000000000000060.580.310.570.339999999999999860.370.530.390.750.570.69.840.550.540.790.490.60000000000000010.61
Percentage of EarningsPerShareBasic100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.099.4100.299.8

Earnings Per Share Diluted

us-gaap:EarningsPerShareDiluted



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
Value0.830.780.710.830.280.310000000000000050.580.310.570.339999999999999860.370.530.390.75999999999999980.560.599.760.55999999999999980.530.780.4890.5950.6070.3080.2160.31.0450.93.0121.170.7190.3290.470.330.351.8520.420.650.0880.0220.180.150.4830.3540.28
Percentage of EarningsPerShareDiluted100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

eqr:ERPOP



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-30
Value0.830.780.710.830.280.310000000000000050.580.310.570.339999999999999860.370.530.390.75999999999999980.560.599.760.55999999999999980.530.780.490.60000000000000010.61
Percentage of EarningsPerShareDiluted100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.2100.8100.5

Income Loss From Continuing Operations Per Basic Share

Income Loss From Continuing Operations Per Diluted Share

Revenue From Contract With Customer Excluding Assessed Tax

Revenue From Contract With Customer Including Assessed Tax

us-gaap:RevenueFromContractWithCustomerIncludingAssessedTax



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-312009-06-302009-03-31
Value000000000-1839624612604-1816606595619703696679666664664652633629635539556543527511498520453510488480483
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

eqr:ERPOP



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value24000.024000.025000.0143000.0192000.0190000.0190000.0188000.0185000.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax eqr:ERPOP100.0100.0100.0100.0100.0100.0100.0100.0100.0

Revenues

us-gaap:Revenues



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-312009-06-302009-03-31
Value682683685669662652652639633630624612604605606595619703696679666664664652633629635539556543527511498520453510488480483
Percentage of Revenues100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax2843037.52849662.52740580.0468193.7345049.0343548.9343614.2340323.4342170.8-34.3100.0100.0100.0-33.3100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

eqr:ERPOP



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-30
Value682683685669662652652639633630624612604605606595619703696679666664664
Percentage of Revenues100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax2843037.52849662.52740580.0468193.7345049.0343548.9343614.2340323.4342170.8-34.3100.0100.0100.0-33.3100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax eqr:ERPOP2843037.52849662.52740580.0468193.7345049.0343548.9343614.2340323.4342170.80.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Sales Revenue Net

Gross Profit

Operating Expenses

us-gaap:StatementBusinessSegments

us-gaap:OperatingExpenses

eqr:NonSameStoreAndOther



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value132951315211515192014191718141328
Percentage of OperatingExpenses100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax56712.5122054.223968.09360.87910.911326.38267.98269.710680.0-1.12.43.22.8-1.02.42.24.6
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax eqr:NonSameStoreAndOther0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

eqr:SameStore



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value199174196186191174182177180160173167167156171160161
Percentage of OperatingExpenses1468.9596.63279.71393.41259.6810.21160.01142.9912.8772.51161.7844.9983.1842.11176.21211.7567.8
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax833070.8728166.7786080.0130434.399647.491767.495905.394510.197490.8-8.727.927.327.7-8.628.227.026.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax eqr:SameStore0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

eqr:SameStoreNonSameStoreAndOther



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value213204202199206195197193200180188186184175185173189
Percentage of OperatingExpenses1568.9696.63379.71493.41359.6910.21260.01242.91012.8872.51261.7944.91083.1942.11276.21311.7667.8
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax889783.3850220.8810048.0139795.1107558.3103093.7104173.2102779.8108170.8-9.830.330.530.5-9.730.629.230.6
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax eqr:SameStoreNonSameStoreAndOther0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:StatementGeographical, us-gaap:StatementBusinessSegments

eqr:Boston, eqr:SameStore



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value1815161518141615
Percentage of OperatingExpenses133.453.0271.1118.5120.169.4102.699.5
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax75666.764712.564972.011090.29500.57861.18486.38231.4
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax eqr:Boston eqr:SameStore0.00.00.00.00.00.00.00.0

eqr:Denver, eqr:SameStore



Period End2020-03-312019-03-31
Value11
Percentage of OperatingExpenses9.17.9
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax5137.5622.9
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax eqr:Denver eqr:SameStore0.00.0

eqr:LosAngeles, eqr:SameStore



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value3633363336333431
Percentage of OperatingExpenses271.2113.5611.9252.3239.8153.5220.8204.8
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax153816.7138520.8146664.023619.618974.017381.118254.216938.8
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax eqr:LosAngeles eqr:SameStore0.00.00.00.00.00.00.00.0

eqr:NonSameStore, eqr:NonSameStoreAndOther



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value91891111126
Percentage of OperatingExpenses67.364.1161.587.211.753.717.741.6
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax38187.578291.738704.08165.0928.66080.01465.83438.8
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax eqr:NonSameStore eqr:NonSameStoreAndOther0.00.00.00.00.00.00.00.0

eqr:OrangeCounty, eqr:SameStore



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value65656666
Percentage of OperatingExpenses45.719.9106.544.840.728.039.539.5
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax25891.724266.725528.04193.03216.13175.83264.73266.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax eqr:OrangeCounty eqr:SameStore0.00.00.00.00.00.00.00.0

eqr:Other, eqr:NonSameStoreAndOther



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value410-3191456
Percentage of OperatingExpenses32.735.9-61.512.862.668.735.440.3
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax18525.043762.5-14736.01195.84950.57778.92927.43336.7
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax eqr:Other eqr:NonSameStoreAndOther0.00.00.00.00.00.00.00.0

eqr:SanDiego, eqr:SameStore



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value66656665
Percentage of OperatingExpenses46.420.8107.644.540.528.039.737.2
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax26320.825433.325788.04166.43202.13176.83281.13079.8
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax eqr:SanDiego eqr:SameStore0.00.00.00.00.00.00.00.0

eqr:SanFrancisco, eqr:SameStore



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value3028312929273028
Percentage of OperatingExpenses225.598.8524.7219.0194.2128.9193.6183.9
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax127891.7120550.0125752.020501.415365.614605.316010.515208.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax eqr:SanFrancisco eqr:SameStore0.00.00.00.00.00.00.00.0

eqr:Seattle, eqr:SameStore



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value1714161517131615
Percentage of OperatingExpenses128.049.5268.5112.5112.764.1102.298.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax72612.560412.564344.010526.68915.67256.38453.78104.3
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax eqr:Seattle eqr:SameStore0.00.00.00.00.00.00.00.0

eqr:SouthernCalifornia, eqr:SameStore



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value4945494548454743
Percentage of OperatingExpenses363.3154.2826.0341.6321.0209.5300.0281.6
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax206029.2188220.8197980.031979.025392.223733.724800.023284.6
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax eqr:SouthernCalifornia eqr:SameStore0.00.00.00.00.00.00.00.0

stpr:DC, eqr:SameStore



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value3223343431223433
Percentage of OperatingExpenses235.481.0580.7254.5207.5105.8219.9215.8
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax133516.798829.2139188.023822.416416.711984.218183.717847.3
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax stpr:DC eqr:SameStore0.00.00.00.00.00.00.00.0

stpr:NY, eqr:SameStore



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value5046484648454543
Percentage of OperatingExpenses374.2159.6806.0345.9321.9209.4287.4281.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax212216.7194737.5193172.032380.425465.623712.623759.523235.6
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax stpr:NY eqr:SameStore0.00.00.00.00.00.00.00.0

Costs And Expenses

us-gaap:CostsAndExpenses



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
Value468453447439452433428422436415406401399381396389402416438432448414420424434508564421372378381360351387395400389370359351353350
Percentage of CostsAndExpenses100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax1950820.81888350.01789388.0307072.0235679.2228124.7225334.7224550.0235755.1-22.665.165.666.2-21.065.565.465.059.263.063.767.362.363.465.068.580.788.878.266.969.572.370.570.674.40.088.176.275.70.00.073.672.6

dei:LegalEntity

eqr:ERPOP



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-30
Value468453447439452433428422436415406401399381396389402416438432448414420
Percentage of CostsAndExpenses100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax1950820.81888350.01789388.0307072.0235679.2228124.7225334.7224550.0235755.1-22.665.165.666.2-21.065.565.465.059.263.063.767.262.363.4
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax eqr:ERPOP1950820.81888350.01789388.0307072.0235679.2228124.7225334.7224550.0235755.10.00.00.00.00.00.00.00.00.00.00.00.00.00.0

General And Administrative Expense

us-gaap:GeneralAndAdministrativeExpense



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
Value1411111415121212161112131410121816141515199913171416161013131010118101010891010
Percentage of GeneralAndAdministrativeExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax60491.748458.345668.010020.38010.96522.66652.66650.08798.9-0.62.02.22.3-0.62.03.12.72.02.22.33.01.51.52.12.82.32.53.11.82.52.62.02.22.20.02.32.02.20.00.02.12.2

dei:LegalEntity

eqr:ERPOP



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-30
Value14111114151212121611121314101218161415151999
Percentage of GeneralAndAdministrativeExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.099.599.2100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax60491.748458.345668.010020.38010.96522.66652.66650.08798.9-0.62.02.22.3-0.62.03.12.72.02.22.33.01.51.5
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax eqr:ERPOP60491.748458.345668.010020.38010.96522.66652.66650.08798.90.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Operating Income Loss

us-gaap:OperatingIncomeLoss



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
Value4224083683692092192242171962142172102042242092062162862572462182502432281991217111714818416514616215114613393127121118126128126132
Percentage of OperatingIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax1758787.51703966.71473452.0258223.8109358.9115424.2118279.5115773.4106415.7-11.734.934.433.8-12.334.534.635.040.837.036.332.737.736.635.031.519.311.221.80.033.130.527.70.029.529.425.60.028.023.824.30.00.026.427.4

dei:LegalEntity

eqr:ERPOP



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-30
Value422408368369209219224217196214217210204224209206216286257246218250243
Percentage of OperatingIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.1100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax1758787.51703966.71473452.0258223.8109358.9115424.2118279.5115773.4106415.7-11.734.934.433.8-12.334.534.635.040.837.036.332.837.736.6
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax eqr:ERPOP1758787.51703966.71473452.0258223.8109358.9115424.2118279.5115773.4106415.70.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:StatementBusinessSegments

eqr:NonSameStoreAndOther



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value2059292524353124224621212634162241
Percentage of OperatingIncomeLoss4.814.48.06.911.716.114.011.211.521.710.010.113.015.48.010.719.4
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax84654.2245925.0117664.017775.512765.618557.416608.413002.712264.3-2.53.53.54.4-1.92.83.76.8
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax eqr:NonSameStoreAndOther0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

eqr:SameStore



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value448420453444431421423421410403413404392395403399384
Percentage of OperatingIncomeLoss106.2102.9123.0120.3205.4192.2188.3193.9208.3187.7189.8192.0192.3176.4192.8193.7177.7
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax1868500.01753416.71812768.0310523.1224625.0221797.9222732.6224441.0221635.7-21.966.266.065.0-21.866.667.162.2
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax eqr:SameStore0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

eqr:SameStoreNonSameStoreAndOther



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value468479482469455456454446432449435425419429420421426
Percentage of OperatingIncomeLoss111.1117.3131.0127.1217.1208.2202.4205.1219.8209.4199.8202.1205.3191.8200.7204.5197.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax1953154.21999341.71930432.0328298.6237390.6240355.3239341.1237443.6233900.0-24.469.769.569.5-23.769.370.868.9
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax eqr:SameStoreNonSameStoreAndOther0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:StatementGeographical, us-gaap:StatementBusinessSegments

eqr:Boston, eqr:SameStore



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value4542434243404040
Percentage of OperatingIncomeLoss10.810.411.711.520.818.518.118.8
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax189679.2176833.3172444.029625.922749.521342.121368.421757.4
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax eqr:Boston eqr:SameStore0.00.00.00.00.00.00.00.0

eqr:Denver, eqr:SameStore



Period End2020-03-312019-03-31
Value33
Percentage of OperatingIncomeLoss0.81.6
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax13854.21760.9
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax eqr:Denver eqr:SameStore0.00.0

eqr:LosAngeles, eqr:SameStore



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value8584858383818479
Percentage of OperatingIncomeLoss20.120.623.322.639.637.237.536.5
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax354183.3351795.8343360.058301.443284.442905.844305.842226.1
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax eqr:LosAngeles eqr:SameStore0.00.00.00.00.00.00.00.0

eqr:NonSameStore, eqr:NonSameStoreAndOther



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value20412225422510
Percentage of OperatingIncomeLoss4.910.16.16.81.910.42.45.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax85366.7172220.889980.017507.72112.012001.12828.95812.8
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax eqr:NonSameStore eqr:NonSameStoreAndOther0.00.00.00.00.00.00.00.0

eqr:OrangeCounty, eqr:SameStore



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value2020202019191919
Percentage of OperatingIncomeLoss4.95.15.55.49.48.98.68.8
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax85333.386420.881016.014029.410235.910299.510208.410134.6
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax eqr:OrangeCounty eqr:SameStore0.00.00.00.00.00.00.00.0

eqr:Other, eqr:NonSameStoreAndOther



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value017601524106
Percentage of OperatingIncomeLoss-0.04.31.90.17.611.44.73.1
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax-712.573704.227684.0267.88260.413153.25526.83554.3
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax eqr:Other eqr:NonSameStoreAndOther0.00.00.00.00.00.00.00.0

eqr:SanDiego, eqr:SameStore



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value1717171717171617
Percentage of OperatingIncomeLoss4.24.44.84.88.27.97.67.9
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax74270.874375.070468.012421.08935.49102.68937.49118.1
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax eqr:SanDiego eqr:SameStore0.00.00.00.00.00.00.00.0

eqr:SanFrancisco, eqr:SameStore



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value9191959488899189
Percentage of OperatingIncomeLoss21.622.426.025.542.240.740.841.3
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax380233.3382083.3382664.065751.046129.746977.448239.547779.3
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax eqr:SanFrancisco eqr:SameStore0.00.00.00.00.00.00.00.0

eqr:Seattle, eqr:SameStore



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value4738444044364238
Percentage of OperatingIncomeLoss11.39.312.010.921.216.618.717.7
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax198037.5158612.5177392.028136.423166.719122.122128.920541.5
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax eqr:Seattle eqr:SameStore0.00.00.00.00.00.00.00.0

eqr:SouthernCalifornia, eqr:SameStore



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value123123123121119118120115
Percentage of OperatingIncomeLoss29.230.133.632.857.154.053.653.1
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax513787.5512591.7494844.084751.762455.762307.963451.661478.7
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax eqr:SouthernCalifornia eqr:SameStore0.00.00.00.00.00.00.00.0

stpr:DC, eqr:SameStore



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value7158767869577476
Percentage of OperatingIncomeLoss17.014.320.921.333.326.233.135.2
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax299333.3243095.8307660.054984.636450.030232.639173.740714.4
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax stpr:DC eqr:SameStore0.00.00.00.00.00.00.00.0

stpr:NY, eqr:SameStore



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value6566696765666967
Percentage of OperatingIncomeLoss15.616.418.818.231.430.430.830.8
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax273575.0278679.2276356.047045.534305.735044.236454.735642.6
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax stpr:NY eqr:SameStore0.00.00.00.00.00.00.00.0

Interest Expense

Interest Expense Debt

us-gaap:InterestExpenseDebt



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
Value8510085108949111194116959191106958686213110114110108-804118115113120122195113115118113120121117122115115143121115123
Percentage of InterestExpenseDebt100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax356625.0417916.7343744.076155.249446.948371.658536.350069.762758.9-5.214.614.917.6-5.314.214.534.515.716.416.316.3-121.017.817.817.819.119.436.320.521.322.522.124.223.30.027.122.723.60.00.024.125.6

dei:LegalEntity

eqr:ERPOP



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-30
Value8510085108949111194116959191106958686213110114110108109118
Percentage of InterestExpenseDebt100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.1100.1-13.7100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax356625.0417916.7343744.076155.249446.948371.658536.350069.762758.9-5.214.614.917.6-5.314.214.534.515.716.416.316.316.517.8
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax eqr:ERPOP356625.0417916.7343744.076155.249446.948371.658536.350069.762758.90.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Other Nonoperating Income Expense

Income Loss From Continuing Operations

Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest

us-gaap:IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
Value332301277321109122223118220130144204149301217228373121320529819035511710281-12-51-15310013236173835217-32199-2-1691212
Percentage of IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax1386129.21255441.71111384.0224684.656904.764414.7117813.762984.0119215.1-7.123.133.324.8-16.635.838.4602.830.429.544.028.553.517.715.712.9-2.0-8.1-28.40.023.96.73.30.06.94.31.50.04.41.8-0.50.00.02.62.5

dei:LegalEntity

eqr:ERPOP



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-30
Value3323012773211091222231182201301442041493012172283731213205298190226231
Percentage of IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.063.8196.6
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax1386129.21255441.71111384.0224684.656904.764414.7117813.762984.0119215.1-7.123.133.324.8-16.635.838.4602.830.429.544.028.534.134.8
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax eqr:ERPOP1386129.21255441.71111384.0224684.656904.764414.7117813.762984.0119215.10.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Income Loss From Continuing Operations Attributable To Noncontrolling Entity

Income Tax Expense Benefit

us-gaap:IncomeTaxExpenseBenefit



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
Value0-30000000000000000000000000000000000005002
Percentage of IncomeTaxExpenseBenefit100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax220.8-12625.01060.0172.0124.058.4147.4145.7115.10.00.00.00.0-0.00.10.10.10.00.00.00.00.00.00.10.00.10.10.10.00.00.00.10.0-0.00.0-0.1-0.00.00.00.00.10.4

dei:LegalEntity

eqr:ERPOP



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-30
Value0-3000000000000000000000
Percentage of IncomeTaxExpenseBenefit100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax220.8-12625.01060.0172.0124.058.4147.4145.7115.10.00.00.00.0-0.00.10.10.10.00.00.00.00.00.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax eqr:ERPOP220.8-12625.01060.0172.0124.058.4147.4145.7115.10.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Income Taxes Paid Net

us-gaap:IncomeTaxesPaidNet



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-09-302011-06-302011-03-312010-12-312010-03-312009-12-312009-03-31
Value0-100000000000000000000000000000-100
Percentage of IncomeTaxesPaidNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax1108.3-6262.5656.0155.9276.6-42.6152.696.8249.70.00.10.00.1-0.00.00.10.10.00.00.00.10.10.00.00.10.10.1-0.00.10.10.0-0.40.00.1

dei:LegalEntity

eqr:ERPOP



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-31
Value0-100000000000000000000
Percentage of IncomeTaxesPaidNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax1108.3-6262.5656.0155.9276.6-42.6152.696.8249.70.00.10.00.1-0.00.00.10.10.00.00.00.10.1
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax eqr:ERPOP1108.3-6262.5656.0155.9276.6-42.6152.696.8249.70.00.00.00.00.00.00.00.00.00.00.00.00.0

Profit Loss

us-gaap:ProfitLoss



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
Value33230127732110912222311822013014420414930221722837312132052981902272311178239133610612361081521071125811331982910574714310585
Percentage of ProfitLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax1386129.21255441.71111384.0224684.656904.764414.7117813.762984.0119215.1-7.123.133.324.8-16.635.938.4602.830.429.544.028.534.234.818.013.162.253.0196.842.519.928.80.022.1116.825.60.06.62.011.80.00.022.117.7

dei:LegalEntity

eqr:ERPOP



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-30
Value3323012773211091222231182201301442041493022172283731213205298190227231
Percentage of ProfitLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax1386129.21255441.71111384.0224684.656904.764414.7117813.762984.0119215.1-7.123.133.324.8-16.635.938.4602.830.429.544.028.534.234.8
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax eqr:ERPOP1386129.21255441.71111384.0224684.656904.764414.7117813.762984.0119215.10.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Comprehensive Income Net Of Tax

us-gaap:ComprehensiveIncomeNetOfTax



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
Value313296272294941032301232221311442031482812122213612209203301174210223108713743401028226951523526134248-8-61427113610787
Percentage of ComprehensiveIncomeNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax1304600.01233579.21090628.0206060.149415.154427.9121551.665768.1120155.1-7.123.133.324.5-15.535.137.2583.529.829.244.526.331.733.716.711.359.553.6190.740.717.528.80.7105.625.80.0-1.8-12.08.70.00.022.318.1

dei:LegalEntity

eqr:ERPOP



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-30
Value324306282305981072391282301361492111532932212303756217211313181218232
Percentage of ComprehensiveIncomeNetOfTax103.7103.7103.7103.7103.7103.8103.8103.8103.8103.7103.7103.8103.8104.0104.0104.0104.0103.9104.0104.0103.9103.9103.9
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax1353366.71279116.71131092.0213735.751266.156480.0126166.868258.0124727.6-7.424.034.525.4-16.136.538.7606.830.930.346.227.332.935.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax eqr:ERPOP1353366.71279116.71131092.0213735.751266.156480.0126166.868258.0124727.60.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest

us-gaap:ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
Value2411101144959468625991459912799431411431056525581022754
Percentage of ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax100975.049066.743784.08249.72267.22462.15010.02760.64940.0-0.31.01.41.1-1.41.51.623.41.31.31.91.11.41.40.70.52.31.98.01.80.91.31.05.21.10.00.20.00.50.00.01.21.0

dei:LegalEntity

eqr:ERPOP



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-30
Value1200000000000014000100000
Percentage of ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest51.77.27.67.018.416.77.99.87.4-0.612.99.112.455.58.88.10.512.610.96.68.78.27.4
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax52208.33529.23320.0574.1416.1410.0394.7270.7367.60.00.10.10.1-0.80.10.10.10.20.10.10.10.10.1
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax eqr:ERPOP52208.33529.23320.0574.1416.1410.0394.7270.7367.60.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest

us-gaap:ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
Value3373072833069910824012823113615021215430722223137572182123141822192331137538935210712361001588551140256-6-61447314311291
Percentage of ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax1405575.01282645.81134412.0214309.851682.356890.0126561.668528.7125095.1-7.424.134.725.6-16.936.738.8607.031.130.546.427.433.135.117.411.861.855.5198.842.618.430.11.7110.826.90.0-1.5-12.09.20.00.023.519.0

dei:LegalEntity

eqr:ERPOP



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-30
Value337307283306991082401282311361502121543072222313757218212314182219233
Percentage of ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax1405575.01282645.81134412.0214309.851682.356890.0126561.668528.7125095.1-7.424.134.725.6-16.936.738.8607.031.130.546.427.433.135.1
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax eqr:ERPOP1405575.01282645.81134412.0214309.851682.356890.0126561.668528.7125095.10.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Net Income Loss

us-gaap:NetIncomeLoss



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
Value3082892673081041172141132111251381961432772082183587204196286182217221112793773241017226103145107555127189289554513510080
Percentage of NetIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax1285858.31207350.01068424.0216061.554447.461677.4113124.760426.6114491.4-6.822.132.023.8-15.334.436.8579.529.128.242.227.432.833.417.312.559.951.1188.840.719.027.521.1111.624.50.06.31.911.40.00.020.916.7

dei:LegalEntity

eqr:ERPOP



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-30
Value3203002773201081212231172191301432031492882162273731212204297189226230
Percentage of NetIncomeLoss103.7103.7103.7103.7103.7103.8103.8103.8103.8103.7103.7103.8103.8104.0104.0104.0104.0103.9104.0104.0103.9103.9103.9
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax1333920.81251912.51108064.0224110.556488.564004.7117418.962713.3118847.6-7.123.033.224.7-15.935.738.2602.730.229.443.828.434.034.7
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax eqr:ERPOP1333920.81251912.51108064.0224110.556488.564004.7117418.962713.3118847.60.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:StatementEquityComponents

us-gaap:RetainedEarnings



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-09-302011-06-302011-03-312010-12-312010-03-31
Value308289267308104117214113211125138196143277208218358720419628618221722111279101714510755512718955
Percentage of NetIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax1285858.31207350.01068424.0216061.554447.461677.4113124.760426.6114491.4-6.822.132.023.8-15.334.436.8579.529.128.242.227.432.833.417.312.5188.827.521.1111.624.50.011.4
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Net Income Loss Available To Common Stockholders Basic

us-gaap:NetIncomeLossAvailableToCommonStockholdersBasic



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
Value3072882663081031162141122111241371951422762072183586202195285178216220111781093763231016365218991419910455212318525651411329677
Percentage of NetIncomeLossAvailableToCommonStockholdersBasic100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax1282637.51204133.31065332.0215521.754044.861271.1112717.960016.0114073.5-6.822.031.923.7-15.234.236.6579.428.928.142.126.832.633.217.112.30.059.851.0188.60.039.318.426.90.020.4110.923.80.05.51.210.60.00.020.116.0

Net Income Loss Available To Common Stockholders Diluted

us-gaap:NetIncomeLossAvailableToCommonStockholdersDiluted



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-30
Value3192992763191071202221172191291422021482872152263730211203296185225229116813763231016229104148109578123256
Percentage of NetIncomeLossAvailableToCommonStockholdersDiluted100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax1330700.01248695.81104972.0223570.656085.963598.4117012.162302.7118429.7-7.022.933.124.6-15.835.638.1602.630.029.243.727.933.934.617.812.859.851.0188.641.219.228.121.3116.123.85.51.2

Net Income Loss Attributable To Noncontrolling Interest

us-gaap:NetIncomeLossAttributableToNoncontrollingInterest



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302010-03-31
Value11109113484845751188143871178843141243102
Percentage of NetIncomeLossAttributableToNoncontrollingInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax48062.544562.539640.08049.02041.12327.44294.22286.74356.2-0.30.81.20.9-0.61.41.523.11.11.11.71.11.31.30.70.52.42.08.01.90.5

us-gaap:StatementEquityComponents

eqr:PartiallyOwned



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value12000000000000
Percentage of NetIncomeLossAttributableToNoncontrollingInterest108.67.98.47.120.417.69.211.88.4-0.715.510.414.6
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax52208.33529.23320.0574.1416.1410.0394.7270.7367.60.00.10.10.1
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax eqr:PartiallyOwned0.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:NoncontrollingInterest



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value1110911348484575331-8-8-14360
Percentage of NetIncomeLossAttributableToNoncontrollingInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.02998.9-100.0-100.0-100.0750.7
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax48062.544562.539640.08049.02041.12327.44294.22286.74356.2-0.30.81.20.9-18.3-1.4-1.5-23.18.6
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax us-gaap:NoncontrollingInterest0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Assets

us-gaap:Assets



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312008-12-31
Value20919211722105420990207682039420542204062038320570206972063620608207042129721229213012315723008230812302922950230082299122889228342381123482237951720116668167141648116659157561639816075161841608615625155181541716535
Percentage of Assets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Liabilities

us-gaap:Liabilities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312008-12-31
Value97951016410152101751006996159693960095049729982397309733980110517934494711189411781117481181311742118601192211764116261251212435129739275100401015710005103809523100841025610592108651031510075998411202
Percentage of Liabilities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets46.848.048.248.548.547.147.247.046.647.347.547.247.247.349.444.044.551.451.250.951.351.251.551.951.450.952.553.054.553.960.260.860.762.360.461.563.865.467.566.064.964.867.7

dei:LegalEntity

eqr:ERPOP



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302014-12-31
Value9795101641015210175100699615969396009504972998239730973398011051793449471118941178111742
Percentage of Liabilities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets46.848.048.248.548.547.147.247.046.647.347.547.247.247.349.444.044.551.451.251.2
Percentage of Assets eqr:ERPOP46.848.048.248.548.547.147.247.046.647.347.547.247.247.349.444.044.551.451.251.2

us-gaap:ConsolidatedEntities

us-gaap:VariableInterestEntityPrimaryBeneficiary



Period End2020-03-312019-12-312018-12-31
Value332323313
Percentage of Liabilities3.43.23.3
Percentage of Assets1.61.51.5
Percentage of Assets us-gaap:VariableInterestEntityPrimaryBeneficiary44.642.844.0

Liabilities And Stockholders Equity

us-gaap:LiabilitiesAndStockholdersEquity



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312008-12-31
Value20919211722105420990207682039420542204062038320570206972063620608207042129721229213012315723008230812302922950230082299122889228342381123482237951720116668167141648116659157561639816075161841608615625155181541716535
Percentage of LiabilitiesAndStockholdersEquity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

eqr:ERPOP



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302014-12-31
Value2091921172210542099020768203942054220406203832057020697206362060820704212972122921301231572300822950
Percentage of LiabilitiesAndStockholdersEquity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets eqr:ERPOP100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Stockholders Equity

us-gaap:StockholdersEquity



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312008-12-31
Value105301031510182101531004610173102351020810289102421025910290102801022910115111601106310470104781050010331103681037810289103761050710598103221012372895990588558225669573557505278509047484877502150474905
Percentage of StockholdersEquity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets50.348.748.448.448.449.949.850.050.549.849.649.949.949.447.552.651.945.245.545.544.945.245.144.845.346.044.544.042.542.435.935.235.334.036.435.132.831.529.531.232.432.729.7

us-gaap:StatementEquityComponents

us-gaap:AccumulatedOtherComprehensiveIncome



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312010-12-31
Value-72-77-84-89-75-64-50-67-77-88-94-101-109-113-118-123-126-152-157-163-180-172-164-166-162-155-169-166-182-193-197-198-189-196-57
Percentage of StockholdersEquity-0.7-0.8-0.8-0.9-0.7-0.6-0.5-0.7-0.8-0.9-0.9-1.0-1.1-1.1-1.2-1.1-1.1-1.5-1.5-1.6-1.7-1.7-1.6-1.6-1.6-1.5-1.6-1.6-1.8-2.6-3.3-3.4-3.3-3.5-1.1
Percentage of Assets-0.3-0.4-0.4-0.4-0.4-0.3-0.2-0.3-0.4-0.4-0.5-0.5-0.5-0.6-0.6-0.6-0.6-0.7-0.7-0.7-0.8-0.8-0.7-0.7-0.7-0.7-0.7-0.7-0.8-1.1-1.2-1.2-1.2-1.2-0.4
Percentage of Assets us-gaap:AccumulatedOtherComprehensiveIncome0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AdditionalPaidInCapital



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302011-12-312010-12-31
Value9092896589178949892589358900890589108886884888388846875887418718865885728584860785398536857485278541856185428496849265425364522650474741
Percentage of StockholdersEquity86.386.987.688.188.887.887.087.286.686.886.385.986.185.686.478.178.381.981.982.082.782.382.682.982.381.580.682.383.989.789.688.889.093.2
Percentage of Assets43.542.342.442.643.043.843.343.643.743.242.842.842.942.341.041.140.637.037.337.337.137.237.337.137.337.535.936.235.738.032.231.330.329.3
Percentage of Assets us-gaap:AdditionalPaidInCapital0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:CommonStock



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302011-12-312010-12-31
Value3333333333333333333333333333333322
Percentage of StockholdersEquity0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.10.10.10.1
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of Assets us-gaap:CommonStock0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:PreferredStock



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302011-12-312010-12-31
Value37373737373737373737373737373737373740404050505050505050505050200200200
Percentage of StockholdersEquity0.40.40.40.40.40.40.40.40.40.40.40.40.40.40.40.30.30.40.40.40.40.50.50.50.50.50.50.50.50.70.83.43.53.9
Percentage of Assets0.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.30.31.21.21.2
Percentage of Assets us-gaap:PreferredStock0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:RetainedEarnings



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302011-12-312010-12-31
Value14691386130812521155126113441329141514031464151115011543145125242490200920072012192819501915187519442047217119391759887770654615203
Percentage of StockholdersEquity14.013.412.812.311.512.413.113.013.813.714.314.714.615.114.322.622.519.219.219.218.718.818.518.218.719.520.518.817.412.212.911.110.94.0
Percentage of Assets7.06.56.26.05.66.26.56.56.96.87.17.37.37.56.811.911.78.78.78.78.48.58.38.28.59.09.18.37.45.24.63.93.71.3
Percentage of Assets us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Cash And Cash Equivalents At Carrying Value

us-gaap:CashAndCashEquivalentsAtCarryingValue



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-312008-12-312007-12-312006-12-31
Value824528251294732344450463742775174973684237924940317637539721525661245442193834560430643143476019363766742889050260
Percentage of CashAndCashEquivalentsAtCarryingValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.40.20.11.20.10.20.20.20.20.20.20.20.20.42.42.31.70.20.20.40.20.20.10.30.20.24.10.60.23.60.30.31.32.30.33.71.92.70.30.30.41.30.00.00.05.40.00.0

dei:LegalEntity

eqr:ERPOP



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302013-12-312012-12-31
Value8245282512947323444504637427751749736842379249403153612
Percentage of CashAndCashEquivalentsAtCarryingValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.40.20.11.20.10.20.20.20.20.20.20.20.20.42.42.31.70.20.20.40.20.20.10.23.6
Percentage of Assets eqr:ERPOP0.40.20.11.20.10.20.20.20.20.20.20.20.20.42.42.31.70.20.20.00.00.20.00.00.0

Land

us-gaap:Land



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312008-12-31
Value5883593659555889591858755866598659605996598559275902589958745835577758646424637463576295632962966281619262016264631945544609456543844367415841614107411040934003394836503671
Percentage of Land100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets28.128.028.328.128.528.828.629.329.229.128.928.728.628.527.627.527.125.327.927.627.627.427.527.427.427.126.026.726.626.527.727.326.626.226.425.425.625.425.425.625.423.722.2

dei:LegalEntity

eqr:ERPOP



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302014-12-31
Value58835936595558895918587558665986596059965985592759025899587458355777586464246295
Percentage of Land100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets28.128.028.328.128.528.828.629.329.229.128.928.728.628.527.627.527.125.327.927.4
Percentage of Assets eqr:ERPOP28.128.028.328.128.528.828.629.329.229.128.928.728.628.527.627.527.125.327.927.4

Property Plant And Equipment Gross

Investments In Affiliates Subsidiaries Associates And Joint Ventures

us-gaap:InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312008-12-31
Value55525252625857585958595959606065666874948910512814220517816518819317171714121133302565
Percentage of InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0
Percentage of Assets0.30.20.20.30.30.30.30.30.30.30.30.30.30.30.30.30.30.30.30.40.40.50.60.60.90.80.70.80.80.10.10.10.10.10.10.00.00.00.00.00.00.00.0

dei:LegalEntity

eqr:ERPOP



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302014-12-31
Value55525252625857585958595959606065666874105
Percentage of InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.30.20.20.30.30.30.30.30.30.30.30.30.30.30.30.30.30.30.30.5
Percentage of Assets eqr:ERPOP0.30.20.20.30.30.30.30.30.30.30.30.30.30.30.30.30.30.30.30.5

Finite Lived Intangible Assets Net

Long Term Debt

Minority Interest

us-gaap:MinorityInterest



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312008-12-31
Value240229224226219226231231235231234235235231223246244225226343342339339338342337324316311237223218196193119125123118115118125127163
Percentage of MinorityInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets1.11.11.11.11.11.11.11.11.21.11.11.11.11.11.01.21.11.01.01.51.51.51.51.51.51.51.41.31.31.41.31.31.21.20.80.80.80.70.70.80.80.81.0

us-gaap:StatementEquityComponents

eqr:PartiallyOwned



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312015-12-312014-12-31
Value41-1-1-5-2-2-114666104124
Percentage of MinorityInterest2.00.5-0.8-0.6-2.5-1.0-0.9-0.70.52.02.62.72.74.62.036.8
Percentage of Assets0.00.0-0.0-0.0-0.0-0.0-0.0-0.00.00.00.00.00.00.10.00.5
Percentage of Assets eqr:PartiallyOwned0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:NoncontrollingInterest



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302014-12-31
Value235227226227225228233232234226228229228221219241240221221214
Percentage of MinorityInterest98.099.5100.8100.6102.5101.0100.9100.799.598.097.497.397.395.498.198.398.298.097.963.2
Percentage of Assets1.11.11.11.11.11.11.11.11.21.11.11.11.11.11.01.11.11.01.00.9
Percentage of Assets us-gaap:NoncontrollingInterest0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Stockholders Equity

us-gaap:StockholdersEquity



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312008-12-31
Value105301031510182101531004610173102351020810289102421025910290102801022910115111601106310470104781050010331103681037810289103761050710598103221012372895990588558225669573557505278509047484877502150474905
Percentage of StockholdersEquity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets50.348.748.448.448.449.949.850.050.549.849.649.949.949.447.552.651.945.245.545.544.945.245.144.845.346.044.544.042.542.435.935.235.334.036.435.132.831.529.531.232.432.729.7

us-gaap:StatementEquityComponents

us-gaap:AccumulatedOtherComprehensiveIncome



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312010-12-31
Value-72-77-84-89-75-64-50-67-77-88-94-101-109-113-118-123-126-152-157-163-180-172-164-166-162-155-169-166-182-193-197-198-189-196-57
Percentage of StockholdersEquity-0.7-0.8-0.8-0.9-0.7-0.6-0.5-0.7-0.8-0.9-0.9-1.0-1.1-1.1-1.2-1.1-1.1-1.5-1.5-1.6-1.7-1.7-1.6-1.6-1.6-1.5-1.6-1.6-1.8-2.6-3.3-3.4-3.3-3.5-1.1
Percentage of Assets-0.3-0.4-0.4-0.4-0.4-0.3-0.2-0.3-0.4-0.4-0.5-0.5-0.5-0.6-0.6-0.6-0.6-0.7-0.7-0.7-0.8-0.8-0.7-0.7-0.7-0.7-0.7-0.7-0.8-1.1-1.2-1.2-1.2-1.2-0.4
Percentage of Assets us-gaap:AccumulatedOtherComprehensiveIncome0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AdditionalPaidInCapital



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302011-12-312010-12-31
Value9092896589178949892589358900890589108886884888388846875887418718865885728584860785398536857485278541856185428496849265425364522650474741
Percentage of StockholdersEquity86.386.987.688.188.887.887.087.286.686.886.385.986.185.686.478.178.381.981.982.082.782.382.682.982.381.580.682.383.989.789.688.889.093.2
Percentage of Assets43.542.342.442.643.043.843.343.643.743.242.842.842.942.341.041.140.637.037.337.337.137.237.337.137.337.535.936.235.738.032.231.330.329.3
Percentage of Assets us-gaap:AdditionalPaidInCapital0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:CommonStock



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302011-12-312010-12-31
Value3333333333333333333333333333333322
Percentage of StockholdersEquity0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.10.10.10.1
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of Assets us-gaap:CommonStock0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:PreferredStock



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302011-12-312010-12-31
Value37373737373737373737373737373737373740404050505050505050505050200200200
Percentage of StockholdersEquity0.40.40.40.40.40.40.40.40.40.40.40.40.40.40.40.30.30.40.40.40.40.50.50.50.50.50.50.50.50.70.83.43.53.9
Percentage of Assets0.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.30.31.21.21.2
Percentage of Assets us-gaap:PreferredStock0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:RetainedEarnings



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302011-12-312010-12-31
Value14691386130812521155126113441329141514031464151115011543145125242490200920072012192819501915187519442047217119391759887770654615203
Percentage of StockholdersEquity14.013.412.812.311.512.413.113.013.813.714.314.714.615.114.322.622.519.219.219.218.718.818.518.218.719.520.518.817.412.212.911.110.94.0
Percentage of Assets7.06.56.26.05.66.26.56.56.96.87.17.37.37.56.811.911.78.78.78.78.48.58.38.28.59.09.18.37.45.24.63.93.71.3
Percentage of Assets us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Common Stock Value

us-gaap:CommonStockValue



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312008-12-31
Value3333333333333333333333333333333332222222222
Percentage of CommonStockValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Retained Earnings Accumulated Deficit

us-gaap:RetainedEarningsAccumulatedDeficit



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312008-12-31
Value14691386130812521155126113441329141514031464151115011543145125242490200920072012192819501915187519442047217119391759887770654656615684680228203150220310353456
Percentage of RetainedEarningsAccumulatedDeficit100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets7.06.56.26.05.66.26.56.56.96.87.17.37.37.56.811.911.78.78.78.78.48.58.38.28.59.09.18.37.45.24.63.94.03.74.34.21.41.30.91.42.02.32.8

Accumulated Other Comprehensive Income Loss Net Of Tax

us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312008-12-31
Value-72-77-84-89-75-64-50-67-77-88-94-101-109-113-118-123-126-152-157-163-180-172-164-166-162-155-169-166-182-193-197-198-189-196-185-80-50-57-116-79-84-35
Percentage of AccumulatedOtherComprehensiveIncomeLossNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets-0.3-0.4-0.4-0.4-0.4-0.3-0.2-0.3-0.4-0.4-0.5-0.5-0.5-0.6-0.6-0.6-0.6-0.7-0.7-0.7-0.8-0.8-0.7-0.7-0.7-0.7-0.7-0.7-0.8-1.1-1.2-1.2-1.2-1.2-1.2-0.5-0.3-0.4-0.7-0.5-0.10.0-0.2

dei:LegalEntity

eqr:ERPOP



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302014-12-31
Value-72-77-84-89-75-64-50-67-77-88-94-101-109-113-118-123-126-152-157-172
Percentage of AccumulatedOtherComprehensiveIncomeLossNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets-0.3-0.4-0.4-0.4-0.4-0.3-0.2-0.3-0.4-0.4-0.5-0.5-0.5-0.6-0.6-0.6-0.6-0.7-0.7-0.8
Percentage of Assets eqr:ERPOP-0.3-0.4-0.4-0.4-0.4-0.3-0.2-0.3-0.4-0.4-0.5-0.5-0.5-0.6-0.6-0.6-0.6-0.7-0.7-0.8

Net Cash Provided By Used In Operating Activities

us-gaap:NetCashProvidedByUsedInOperatingActivities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-09-302011-06-302011-03-312010-12-312010-03-312009-12-312009-03-31
Value382362403317373312358324361302413256293292344273201293388327347309394282336193235221204187166155140142
Percentage of NetCashProvidedByUsedInOperatingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax1593545.81511683.31613628.0221837.8194554.7164265.3188808.9172572.3195144.9-16.566.241.948.5-16.156.846.032.541.755.848.252.246.659.443.353.235.944.543.341.136.00.031.80.029.5

dei:LegalEntity

eqr:ERPOP



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-31
Value382362403317373312358324361302413256293292344273201293388327347309
Percentage of NetCashProvidedByUsedInOperatingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax1593545.81511683.31613628.0221837.8194554.7164265.3188808.9172572.3195144.9-16.566.241.948.5-16.156.846.032.541.755.848.252.246.6
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax eqr:ERPOP1593545.81511683.31613628.0221837.8194554.7164265.3188808.9172572.3195144.90.00.00.00.00.00.00.00.00.00.00.00.00.0

Net Cash Provided By Used In Investing Activities

us-gaap:NetCashProvidedByUsedInInvestingActivities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-09-302011-06-302011-03-312010-12-312010-03-312009-12-312009-03-31
Value266-113-289-22-347-108-184-231147-113-254-153-73119-1191205751-267-205-26-17911-160-190-304-1041-82-35442-38272-278-126-70
Percentage of NetCashProvidedByUsedInInvestingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax1108370.8-473516.7-1156100.0-15468.5-180747.4-56849.5-97181.1-123124.579620.56.2-40.8-25.0-12.1-6.6-19.820.3929.0-38.1-29.5-3.9-26.91.7-24.2-29.3-48.0-193.2-15.7-7.088.8-7.30.0-56.90.0-14.6

dei:LegalEntity

eqr:ERPOP



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-31
Value266-113-289-22-347-108-184-231147-113-254-153-73119-1191205751-267-205-26-1795
Percentage of NetCashProvidedByUsedInInvestingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.052.1
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax1108370.8-473516.7-1156100.0-15468.5-180747.4-56849.5-97181.1-123124.579620.56.2-40.8-25.0-12.1-6.6-19.820.3929.0-38.1-29.5-3.9-26.90.9
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax eqr:ERPOP1108370.8-473516.7-1156100.0-15468.5-180747.4-56849.5-97181.1-123124.579620.50.00.00.00.00.00.00.00.00.00.00.00.00.0

Net Cash Provided By Used In Financing Activities

us-gaap:NetCashProvidedByUsedInFinancingActivities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-09-302011-06-302011-03-312010-12-312010-03-312009-12-312009-03-31
Value-624-216-339-79-49-176-174-98-514-276-149-107-255-852-204-264-5626-20-237-258-159-312-278-52-48291-316-744-348-274-50-10-458-534
Percentage of NetCashProvidedByUsedInFinancingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax-2602870.8-903154.2-1357016.0-55346.9-25685.9-92908.9-91694.7-52551.1-278036.215.1-24.0-17.6-42.346.9-33.8-44.5-908.9-2.9-34.2-38.0-23.9-47.0-41.9-8.1-7.754.1-60.0-145.4-69.9-52.80.0-2.10.0-110.6

dei:LegalEntity

eqr:ERPOP



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-31
Value-624-216-339-79-49-176-174-98-514-276-149-107-255-852-204-264-5626-20-237-258-159-307
Percentage of NetCashProvidedByUsedInFinancingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.098.2
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax-2602870.8-903154.2-1357016.0-55346.9-25685.9-92908.9-91694.7-52551.1-278036.215.1-24.0-17.6-42.346.9-33.8-44.5-908.9-2.9-34.2-38.0-23.9-46.2
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax eqr:ERPOP-2602870.8-903154.2-1357016.0-55346.9-25685.9-92908.9-91694.7-52551.1-278036.20.00.00.00.00.00.00.00.00.00.00.00.00.0

Net Cash Provided By Used In Operating Activities

us-gaap:NetCashProvidedByUsedInOperatingActivities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-09-302011-06-302011-03-312010-12-312010-03-312009-12-312009-03-31
Value382362403317373312358324361302413256293292344273201293388327347309394282336193235221204187166155140142
Percentage of NetCashProvidedByUsedInOperatingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax1593545.81511683.31613628.0221837.8194554.7164265.3188808.9172572.3195144.9-16.566.241.948.5-16.156.846.032.541.755.848.252.246.659.443.353.235.944.543.341.136.00.031.80.029.5

dei:LegalEntity

eqr:ERPOP



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-31
Value382362403317373312358324361302413256293292344273201293388327347309
Percentage of NetCashProvidedByUsedInOperatingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax1593545.81511683.31613628.0221837.8194554.7164265.3188808.9172572.3195144.9-16.566.241.948.5-16.156.846.032.541.755.848.252.246.6
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax eqr:ERPOP1593545.81511683.31613628.0221837.8194554.7164265.3188808.9172572.3195144.90.00.00.00.00.00.00.00.00.00.00.00.00.0

Net Income Loss

us-gaap:NetIncomeLoss



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
Value3082892673081041172141132111251381961432772082183587204196286182217221112793773241017226103145107555127189289554513510080
Percentage of NetIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax1285858.31207350.01068424.0216061.554447.461677.4113124.760426.6114491.4-6.822.132.023.8-15.334.436.8579.529.128.242.227.432.833.417.312.559.951.1188.840.719.027.521.1111.624.50.06.31.911.40.00.020.916.7

dei:LegalEntity

eqr:ERPOP



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-30
Value3203002773201081212231172191301432031492882162273731212204297189226230
Percentage of NetIncomeLoss103.7103.7103.7103.7103.7103.8103.8103.8103.8103.7103.7103.8103.8104.0104.0104.0104.0103.9104.0104.0103.9103.9103.9
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax1333920.81251912.51108064.0224110.556488.564004.7117418.962713.3118847.6-7.123.033.224.7-15.935.738.2602.730.229.443.828.434.034.7
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax eqr:ERPOP1333920.81251912.51108064.0224110.556488.564004.7117418.962713.3118847.60.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:StatementEquityComponents

us-gaap:RetainedEarnings



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-09-302011-06-302011-03-312010-12-312010-03-31
Value308289267308104117214113211125138196143277208218358720419628618221722111279101714510755512718955
Percentage of NetIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax1285858.31207350.01068424.0216061.554447.461677.4113124.760426.6114491.4-6.822.132.023.8-15.334.436.8579.529.128.242.227.432.833.417.312.5188.827.521.1111.624.50.011.4
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Profit Loss

us-gaap:ProfitLoss



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
Value33230127732110912222311822013014420414930221722837312132052981902272311178239133610612361081521071125811331982910574714310585
Percentage of ProfitLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax1386129.21255441.71111384.0224684.656904.764414.7117813.762984.0119215.1-7.123.133.324.8-16.635.938.4602.830.429.544.028.534.234.818.013.162.253.0196.842.519.928.80.022.1116.825.60.06.62.011.80.00.022.117.7

dei:LegalEntity

eqr:ERPOP



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-30
Value3323012773211091222231182201301442041493022172283731213205298190227231
Percentage of ProfitLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax1386129.21255441.71111384.0224684.656904.764414.7117813.762984.0119215.1-7.123.133.324.8-16.635.938.4602.830.429.544.028.534.234.8
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax eqr:ERPOP1386129.21255441.71111384.0224684.656904.764414.7117813.762984.0119215.10.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Net Cash Provided By Used In Investing Activities

us-gaap:NetCashProvidedByUsedInInvestingActivities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-09-302011-06-302011-03-312010-12-312010-03-312009-12-312009-03-31
Value266-113-289-22-347-108-184-231147-113-254-153-73119-1191205751-267-205-26-17911-160-190-304-1041-82-35442-38272-278-126-70
Percentage of NetCashProvidedByUsedInInvestingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax1108370.8-473516.7-1156100.0-15468.5-180747.4-56849.5-97181.1-123124.579620.56.2-40.8-25.0-12.1-6.6-19.820.3929.0-38.1-29.5-3.9-26.91.7-24.2-29.3-48.0-193.2-15.7-7.088.8-7.30.0-56.90.0-14.6

dei:LegalEntity

eqr:ERPOP



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-31
Value266-113-289-22-347-108-184-231147-113-254-153-73119-1191205751-267-205-26-1795
Percentage of NetCashProvidedByUsedInInvestingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.052.1
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax1108370.8-473516.7-1156100.0-15468.5-180747.4-56849.5-97181.1-123124.579620.56.2-40.8-25.0-12.1-6.6-19.820.3929.0-38.1-29.5-3.9-26.90.9
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax eqr:ERPOP1108370.8-473516.7-1156100.0-15468.5-180747.4-56849.5-97181.1-123124.579620.50.00.00.00.00.00.00.00.00.00.00.00.00.0

Net Cash Provided By Used In Financing Activities

us-gaap:NetCashProvidedByUsedInFinancingActivities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-09-302011-06-302011-03-312010-12-312010-03-312009-12-312009-03-31
Value-624-216-339-79-49-176-174-98-514-276-149-107-255-852-204-264-5626-20-237-258-159-312-278-52-48291-316-744-348-274-50-10-458-534
Percentage of NetCashProvidedByUsedInFinancingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax-2602870.8-903154.2-1357016.0-55346.9-25685.9-92908.9-91694.7-52551.1-278036.215.1-24.0-17.6-42.346.9-33.8-44.5-908.9-2.9-34.2-38.0-23.9-47.0-41.9-8.1-7.754.1-60.0-145.4-69.9-52.80.0-2.10.0-110.6

dei:LegalEntity

eqr:ERPOP



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-31
Value-624-216-339-79-49-176-174-98-514-276-149-107-255-852-204-264-5626-20-237-258-159-307
Percentage of NetCashProvidedByUsedInFinancingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.098.2
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax-2602870.8-903154.2-1357016.0-55346.9-25685.9-92908.9-91694.7-52551.1-278036.215.1-24.0-17.6-42.346.9-33.8-44.5-908.9-2.9-34.2-38.0-23.9-46.2
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax eqr:ERPOP-2602870.8-903154.2-1357016.0-55346.9-25685.9-92908.9-91694.7-52551.1-278036.20.00.00.00.00.00.00.00.00.00.00.00.00.0

Proceeds From Issuance Of Long Term Debt

Repayments Of Long Term Debt

us-gaap:RepaymentsOfLongTermDebt



Period End2020-03-312015-12-31
Value1183
Percentage of RepaymentsOfLongTermDebt100.0100.0
Percentage of LongTermDebtAndCapitalLeaseObligations0.00.0

us-gaap:DebtInstrument, us-gaap:LongtermDebtType

eqr:SecuredConventional, eqr:FixedRateDebt



Period End2020-03-31
Value1
Percentage of RepaymentsOfLongTermDebt100.0
Percentage of LongTermDebtAndCapitalLeaseObligations0.0
Percentage of LongTermDebtAndCapitalLeaseObligations eqr:SecuredConventional eqr:FixedRateDebt0.0

us-gaap:LongtermDebtType, us-gaap:SubsequentEventType

eqr:FourPointSevenFourSevenMortgage, us-gaap:SubsequentEvent



Period End2020-04-01
Value91
Percentage of RepaymentsOfLongTermDebt0.0
Percentage of LongTermDebtAndCapitalLeaseObligations0.0
Percentage of LongTermDebtAndCapitalLeaseObligations eqr:FourPointSevenFourSevenMortgage us-gaap:SubsequentEvent0.0

Payments Of Dividends

Payments Of Dividends

Payments For Repurchase Of Common Stock

Repayments Of Long Term Debt

us-gaap:RepaymentsOfLongTermDebt



Period End2020-03-312015-12-31
Value1183
Percentage of RepaymentsOfLongTermDebt100.0100.0
Percentage of LongTermDebtAndCapitalLeaseObligations0.00.0

us-gaap:DebtInstrument, us-gaap:LongtermDebtType

eqr:SecuredConventional, eqr:FixedRateDebt



Period End2020-03-31
Value1
Percentage of RepaymentsOfLongTermDebt100.0
Percentage of LongTermDebtAndCapitalLeaseObligations0.0
Percentage of LongTermDebtAndCapitalLeaseObligations eqr:SecuredConventional eqr:FixedRateDebt0.0

us-gaap:LongtermDebtType, us-gaap:SubsequentEventType

eqr:FourPointSevenFourSevenMortgage, us-gaap:SubsequentEvent



Period End2020-04-01
Value91
Percentage of RepaymentsOfLongTermDebt0.0
Percentage of LongTermDebtAndCapitalLeaseObligations0.0
Percentage of LongTermDebtAndCapitalLeaseObligations eqr:FourPointSevenFourSevenMortgage us-gaap:SubsequentEvent0.0

Debt Instrument Interest Rate Stated Percentage

Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number

Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price

Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Grants In Period

Share Based Compensation

us-gaap:ShareBasedCompensation



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-09-302011-06-302011-03-312010-12-312010-03-312009-12-312009-03-31
Value7336945610447744109551013228121084564534
Percentage of ShareBasedCompensation100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

eqr:ERPOP



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-31
Value73369456104477441095510132
Percentage of ShareBasedCompensation100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Operating Lease Right Of Use Asset

Cash And Cash Equivalents Period Increase Decrease

Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents

us-gaap:PartnerTypeOfPartnersCapitalAccount, dei:LegalEntity

eqr:AdjustmentForLimitedPartnersOwnershipInOperatingPartnership

us-gaap:GeneralPartner, eqr:ERPOP



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value-31034322-222211
Percentage of AdjustmentForLimitedPartnersOwnershipInOperatingPartnership100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:LimitedPartner, eqr:ERPOP



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value3-10-3-4-3-2-22-2-2-2-11
Percentage of AdjustmentForLimitedPartnersOwnershipInOperatingPartnership-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0

us-gaap:StatementEquityComponents

eqr:AdjustmentToAdditionalPaidInCapitalAndNoncontrollingOwnershipInterest

us-gaap:AdditionalPaidInCapital



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value-31034322-222211
Percentage of AdjustmentToAdditionalPaidInCapitalAndNoncontrollingOwnershipInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:NoncontrollingInterest



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value3-10-3-4-3-2-22-2-2-2-11
Percentage of AdjustmentToAdditionalPaidInCapitalAndNoncontrollingOwnershipInterest-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0

us-gaap:StatementEquityComponents

eqr:AdjustmentToAdditionalPaidInCapitalResultingFromConversionOfCapitalUnits

us-gaap:AdditionalPaidInCapital



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value10404300010014
Percentage of AdjustmentToAdditionalPaidInCapitalResultingFromConversionOfCapitalUnits100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

eqr:AllocationOfNetIncomeLossToNoncontrollingInterestsPartiallyOwnedProperties



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
Value12000000000000140001000000000000000000000000
Percentage of AllocationOfNetIncomeLossToNoncontrollingInterestsPartiallyOwnedProperties100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

eqr:ERPOP



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-30
Value1200000000000014000100000
Percentage of AllocationOfNetIncomeLossToNoncontrollingInterestsPartiallyOwnedProperties100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PartnerTypeOfPartnersCapitalAccount, dei:LegalEntity

us-gaap:PartiallyOwnedProperties, eqr:ERPOP



Period End2020-03-312019-03-31
Value120
Percentage of AllocationOfNetIncomeLossToNoncontrollingInterestsPartiallyOwnedProperties100.0100.0

eqr:AmortizationOfDeferredFinancingCosts



Period End2020-03-312019-12-312019-09-302019-03-312018-12-312018-09-302015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-09-302011-06-302011-03-312010-12-312010-03-312009-12-312009-03-31
Value23222332222232724432332
Percentage of AmortizationOfDeferredFinancingCosts100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

eqr:ERPOP



Period End2020-03-312019-12-312019-09-302019-03-312018-12-312018-09-302015-12-312014-12-31
Value23222332
Percentage of AmortizationOfDeferredFinancingCosts100.0100.0100.0100.0100.0100.0100.0100.0

eqr:AmortizationOfDeferredFinancingCostsInvestmentInRealEstateNet



Period End2020-03-312019-12-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312010-12-312010-03-312009-12-312009-03-31
Value00000000000-1
Percentage of AmortizationOfDeferredFinancingCostsInvestmentInRealEstateNet100.0100.00.00.00.00.0100.00.0100.0100.0100.0100.0

eqr:AmortizationOfDeferredFinancingCostsMortgageNotesPayableNet



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value00110010200000001
Percentage of AmortizationOfDeferredFinancingCostsMortgageNotesPayableNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

eqr:ERPOP



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value00110010200000001
Percentage of AmortizationOfDeferredFinancingCostsMortgageNotesPayableNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

eqr:AmortizationOfDeferredFinancingCostsNetMortgageNotesPayableNet



Period End2020-03-31
Value403000.0
Percentage of AmortizationOfDeferredFinancingCostsNetMortgageNotesPayableNet100.0

us-gaap:DebtInstrument, us-gaap:LongtermDebtType

eqr:SecuredConventional, eqr:FixedRateDebt



Period End2020-03-31
Value293000.0
Percentage of AmortizationOfDeferredFinancingCostsNetMortgageNotesPayableNet72.7

eqr:SecuredConventional, eqr:FloatingRateDebt



Period End2020-03-31
Value60000.0
Percentage of AmortizationOfDeferredFinancingCostsNetMortgageNotesPayableNet14.9

eqr:SecuredTaxExempt, eqr:FloatingRateDebt



Period End2020-03-31
Value50000.0
Percentage of AmortizationOfDeferredFinancingCostsNetMortgageNotesPayableNet12.4

us-gaap:LongtermDebtType

eqr:FloatingRateDebt



Period End2020-03-31
Value110000.0
Percentage of AmortizationOfDeferredFinancingCostsNetMortgageNotesPayableNet27.3

eqr:AmortizationOfDeferredFinancingCostsNotesNet



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value11111111000000002
Percentage of AmortizationOfDeferredFinancingCostsNotesNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

eqr:ERPOP



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value11111111000000002
Percentage of AmortizationOfDeferredFinancingCostsNotesNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

eqr:AmortizationOfDeferredFinancingCostsOtherAssets



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value01000000000001000
Percentage of AmortizationOfDeferredFinancingCostsOtherAssets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

eqr:ERPOP



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value01000000000001000
Percentage of AmortizationOfDeferredFinancingCostsOtherAssets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

eqr:AmortizationOfDeferredSettlementsOnDerivativeInstrumentsOtherLiabilities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-09-302011-06-302011-03-312010-12-312010-03-312009-12-312009-03-31
Value3000.03000.03000.03000.03000.03000.04000.02000.03000.02000.04000.02000.03000.0-153000.03000.03000.069000.0-333000.04000.027000.0133000.0-935000.0134000.0400000.0-133000.0-133000.0-134000.0-134000.0-133000.0-134000.0-133000.0-133000.0-485000.0-345000.0
Percentage of AmortizationOfDeferredSettlementsOnDerivativeInstrumentsOtherLiabilities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

eqr:ERPOP



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-31
Value3000.03000.03000.03000.03000.03000.04000.02000.03000.02000.04000.02000.03000.0-153000.03000.03000.069000.0-333000.04000.027000.0133000.0-935000.0
Percentage of AmortizationOfDeferredSettlementsOnDerivativeInstrumentsOtherLiabilities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

eqr:AmortizationOfDiscountsAndPremiumsOnDebtMortgageNotesPayable



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-09-302011-06-302011-03-312010-12-312010-03-312009-12-312009-03-31
Value00-8150017100000000-21-2-2-2-4-5-3-3-3-7-2-2-1-1-4-1-1-1
Percentage of AmortizationOfDiscountsAndPremiumsOnDebtMortgageNotesPayable100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

eqr:ERPOP



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-31
Value00-8150017100000000-21-2-2-2-4-5
Percentage of AmortizationOfDiscountsAndPremiumsOnDebtMortgageNotesPayable100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DebtInstrument, us-gaap:LongtermDebtType

eqr:SecuredConventional, eqr:FixedRateDebt



Period End2020-03-31
Value285000.0
Percentage of AmortizationOfDiscountsAndPremiumsOnDebtMortgageNotesPayable47.9

eqr:SecuredTaxExempt, eqr:FloatingRateDebt



Period End2020-03-31
Value310000.0
Percentage of AmortizationOfDiscountsAndPremiumsOnDebtMortgageNotesPayable52.1

us-gaap:LongtermDebtType

eqr:FloatingRateDebt



Period End2020-03-31
Value310000.0
Percentage of AmortizationOfDiscountsAndPremiumsOnDebtMortgageNotesPayable52.1

eqr:AmortizationOfDiscountsAndPremiumsOnDebtNotesNet



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-09-302011-06-302011-03-312010-12-312010-03-312009-12-312009-03-31
Value0100000000000000100000000001222233
Percentage of AmortizationOfDiscountsAndPremiumsOnDebtNotesNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

eqr:ERPOP



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-31
Value0100000000000000100000
Percentage of AmortizationOfDiscountsAndPremiumsOnDebtNotesNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DebtInstrument, us-gaap:LongtermDebtType

eqr:UnsecuredPublic, eqr:FixedRateDebt



Period End2020-03-31
Value681000.0
Percentage of AmortizationOfDiscountsAndPremiumsOnDebtNotesNet100.0

us-gaap:PartnerTypeOfPartnersCapitalAccount, dei:LegalEntity

eqr:ChangeInCarryingValueOfRedeemableLimitedPartners

us-gaap:LimitedPartner, eqr:ERPOP



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value-1-1-1-111010
Percentage of ChangeInCarryingValueOfRedeemableLimitedPartners100.0100.0100.0100.0100.0100.0100.0100.0100.0

eqr:CostOfPropertyManagement



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value2722212426232223232020
Percentage of CostOfPropertyManagement100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

eqr:ERPOP



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value2722212426232223232020
Percentage of CostOfPropertyManagement100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

eqr:DebtFinancingCostsOtherAssets



Period End2020-03-312019-12-312019-09-302019-06-302019-03-31
Value0-7000
Percentage of DebtFinancingCostsOtherAssets100.0100.00.00.0100.0

dei:LegalEntity

eqr:ERPOP



Period End2020-03-312019-12-312019-09-302019-06-302019-03-31
Value0-7000
Percentage of DebtFinancingCostsOtherAssets100.0100.00.00.0100.0

eqr:DilutiveOpUnits



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312012-09-302012-06-302011-09-302011-06-302010-09-302010-06-302009-09-302009-06-30
Value130121212012121201212120131313013131301313131414131313131516
Percentage of DilutiveOpUnits100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

eqr:DilutiveSecuritiesOptions



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312012-09-302012-06-302012-03-312011-09-302011-06-30
Value203220222032203330333022233334
Percentage of DilutiveSecuritiesOptions100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

eqr:ERPOP



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-30
Value20322022203220333033302
Percentage of DilutiveSecuritiesOptions100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

eqr:DisposedProperties



Period End2020-03-312019-12-312019-09-302018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-04-302015-03-312014-12-312014-09-302013-03-312012-03-312011-09-302011-06-302011-03-312010-12-31
Value3.02.07.00.01.00.04.01.01.02.01.07.09.03.080.01.01.03.01.03.07.03.063.03.07.026.012.024.0
Percentage of DisposedProperties100.0100.0100.00.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PropertyPlantAndEquipmentByType

eqr:ConsolidatedRentalProperties



Period End2020-03-312019-12-312019-09-302018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value3.02.07.00.01.00.04.01.01.02.01.07.08.03.080.01.0
Percentage of DisposedProperties100.0100.0100.00.0100.00.0100.0100.0100.0100.0100.0100.088.9100.0100.0100.0

eqr:DisposedUnits



Period End2020-03-312019-12-312019-09-302018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-04-302015-03-312014-12-312014-09-302013-03-312012-03-312011-09-302011-06-302011-03-312010-12-31
Value897.01159.0641.00.0506.00.0786.0170.0120.0600.0304.01609.01277.0728.026162.0150.0330.0827.0314.0550.02163.0981.018452.01522.02261.08536.02731.04734.0
Percentage of DisposedUnits100.0100.0100.00.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PropertyPlantAndEquipmentByType

eqr:ConsolidatedRentalProperties



Period End2020-03-312019-12-312019-09-302018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value897.01159.0641.00.0506.00.0786.0170.0120.0600.0304.01609.0941.0728.026162.0150.0
Percentage of DisposedUnits100.0100.0100.00.0100.00.0100.0100.0100.0100.0100.0100.073.7100.0100.0100.0

dei:LegalEntity

eqr:DividendsPreferenceUnits

eqr:ERPOP



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-30
Value00000000000000000000011
Percentage of DividendsPreferenceUnits100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PartnerTypeOfPartnersCapitalAccount, dei:LegalEntity

eqr:ExchangeOfOPUnitsBetweenLimitedPartnerAndGeneralPartner

us-gaap:GeneralPartner, eqr:ERPOP



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value10404300010014
Percentage of ExchangeOfOPUnitsBetweenLimitedPartnerAndGeneralPartner100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:LimitedPartner, eqr:ERPOP



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value-10-40-4-3000-100-14
Percentage of ExchangeOfOPUnitsBetweenLimitedPartnerAndGeneralPartner-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0

us-gaap:PartnerTypeOfPartnersCapitalAccount, dei:LegalEntity

eqr:GeneralPartnerDistribution

us-gaap:GeneralPartner, eqr:ERPOP



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value224210210210210199198198198
Percentage of GeneralPartnerDistribution100.0100.0100.0100.0100.0100.0100.0100.0100.0

eqr:IncomeLossFromEquityMethodInvestmentsMerger



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-31
Value000-690000000000-800-10-13-3-3060420
Percentage of IncomeLossFromEquityMethodInvestmentsMerger100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0

dei:LegalEntity

eqr:ERPOP



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-31
Value000-690000000000-800-10-13-3-3
Percentage of IncomeLossFromEquityMethodInvestmentsMerger100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

eqr:IncreaseDecreaseInLeaseLiabilities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-31
Value-621000.0-485000.0-613000.0-617000.0-554000.0
Percentage of IncreaseDecreaseInLeaseLiabilities100.0100.0100.0100.0100.0

dei:LegalEntity

eqr:ERPOP



Period End2020-03-312019-12-312019-09-302019-06-302019-03-31
Value-621000.0-485000.0-613000.0-617000.0-554000.0
Percentage of IncreaseDecreaseInLeaseLiabilities100.0100.0100.0100.0100.0

eqr:InvestmentsInUnconsolidatedEntities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-30
Value400051002000000
Percentage of InvestmentsInUnconsolidatedEntities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

eqr:ERPOP



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-30
Value400051002000000
Percentage of InvestmentsInUnconsolidatedEntities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

eqr:InvestmentsInUnconsolidatedEntitiesOtherLiabilities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value00010000002000100
Percentage of InvestmentsInUnconsolidatedEntitiesOtherLiabilities100.00.00.0100.0100.00.0100.00.0100.00.0100.00.0100.0100.0100.00.0100.0

dei:LegalEntity

eqr:ERPOP



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value00010000002000100
Percentage of InvestmentsInUnconsolidatedEntitiesOtherLiabilities100.00.00.0100.0100.00.0100.00.0100.00.0100.00.0100.0100.0100.00.0100.0

us-gaap:PartnerTypeOfPartnersCapitalAccount, dei:LegalEntity

eqr:IssuanceOfLongTermIncentivePlanUnitsIntoNoncontrollingInterest

us-gaap:LimitedPartner, eqr:ERPOP



Period End2020-03-312018-12-312018-09-302018-06-302018-03-31
Value12000.00.00.00.01000.0
Percentage of IssuanceOfLongTermIncentivePlanUnitsIntoNoncontrollingInterest100.00.00.00.0100.0

us-gaap:StatementEquityComponents

us-gaap:NoncontrollingInterest



Period End2020-03-312018-12-312018-09-302018-06-302018-03-31
Value12000.00.00.00.01000.0
Percentage of IssuanceOfLongTermIncentivePlanUnitsIntoNoncontrollingInterest100.00.00.00.0100.0

eqr:IssuanceOfLtips



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value243063.01165.00.06841.0133214.00.00.04026.0263048.00.00.02566.0289081.0
Percentage of IssuanceOfLtips100.0100.00.0100.0100.00.00.0100.0100.00.00.0100.0100.0

dei:LegalEntity

eqr:ERPOP



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value243063.01165.00.06841.0133214.00.00.04026.0263048.00.00.02566.0289081.0
Percentage of IssuanceOfLtips100.0100.00.0100.0100.00.00.0100.0100.00.00.0100.0100.0

eqr:LimitedPartnersChangeInCarryingValue



Period End2020-03-312019-03-31
Value1-1
Percentage of LimitedPartnersChangeInCarryingValue100.0100.0

eqr:LimitedPartnersChangeInRedemptionValue



Period End2020-03-312019-03-31
Value-11155
Percentage of LimitedPartnersChangeInRedemptionValue100.0100.0

us-gaap:PartnerTypeOfPartnersCapitalAccount, dei:LegalEntity

eqr:LimitedPartnersRedemptions

us-gaap:GeneralPartner, eqr:ERPOP



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value11132-57-1-550-14-1312
Percentage of LimitedPartnersRedemptions100.0100.0100.0100.0100.0100.0100.0100.0100.0

eqr:MinorityInterestChangeInCarryingValue



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312014-03-312013-03-312012-03-312011-09-302011-06-302011-03-312010-12-31
Value1111-1-10-10-100-31-23831-1634
Percentage of MinorityInterestChangeInCarryingValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StatementEquityComponents

us-gaap:NoncontrollingInterest



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value-1-1-1-11101010031
Percentage of MinorityInterestChangeInCarryingValue-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0

us-gaap:PartnerTypeOfPartnersCapitalAccount, dei:LegalEntity

eqr:MinorityInterestIncreaseFromContributionsByNoncontrollingInterestsPartiallyOwnedProperties

us-gaap:PartiallyOwnedProperties, eqr:ERPOP



Period End2020-03-312019-12-312019-09-302019-06-302018-12-312018-09-302018-06-302018-03-31
Value02040000
Percentage of MinorityInterestIncreaseFromContributionsByNoncontrollingInterestsPartiallyOwnedProperties100.0100.00.0100.00.00.00.0100.0

us-gaap:StatementEquityComponents

eqr:PartiallyOwned



Period End2020-03-312019-12-312019-09-302019-06-302018-12-312018-09-302018-06-302018-03-31
Value02040000
Percentage of MinorityInterestIncreaseFromContributionsByNoncontrollingInterestsPartiallyOwnedProperties100.0100.00.0100.00.00.00.0100.0

dei:LegalEntity

eqr:NetIncomeLossAvailableToOpUnitholdersBasicDilutedNumerator

eqr:ERPOP



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-30
Value3192992763191071202221172191291422021482872152263730211203296185225229
Percentage of NetIncomeLossAvailableToOpUnitholdersBasicDilutedNumerator100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

eqr:NonRealEstateCapitalAdditions



Period End2020-03-312019-12-312019-03-312018-12-31
Value4211
Percentage of NonRealEstateCapitalAdditions100.0100.0100.0100.0

dei:LegalEntity

eqr:ERPOP



Period End2020-03-312019-12-312019-03-312018-12-31
Value4211
Percentage of NonRealEstateCapitalAdditions100.0100.0100.0100.0

eqr:OperatingAndFinanceLeaseRightOfUseAssetAmortization



Period End2020-03-312019-12-312019-03-31
Value314
Percentage of OperatingAndFinanceLeaseRightOfUseAssetAmortization100.0100.0100.0

dei:LegalEntity

eqr:ERPOP



Period End2020-03-312019-12-312019-03-31
Value314
Percentage of OperatingAndFinanceLeaseRightOfUseAssetAmortization100.0100.0100.0

eqr:OperatingLeaseLeaseIncomeLoss



Period End2020-03-312019-12-312019-09-302019-06-302019-03-31
Value662712642629640
Percentage of OperatingLeaseLeaseIncomeLoss100.0100.0100.0100.0100.0

us-gaap:ProductOrService

eqr:PetRent



Period End2020-03-312019-12-312019-09-302019-06-302019-03-31
Value22222
Percentage of OperatingLeaseLeaseIncomeLoss0.40.40.50.50.5

eqr:ResidentialAndRetail



Period End2020-03-312019-12-312019-09-302019-06-302019-03-31
Value630629629615610
Percentage of OperatingLeaseLeaseIncomeLoss95.288.597.997.995.4

eqr:StorageRent



Period End2020-03-312019-12-312019-09-302019-06-302019-03-31
Value981000.0969000.0960000.0924000.0963000.0
Percentage of OperatingLeaseLeaseIncomeLoss0.10.10.10.10.2

eqr:UtilityRecoveries



Period End2020-03-312019-03-31
Value1716
Percentage of OperatingLeaseLeaseIncomeLoss2.72.6

us-gaap:Parking



Period End2020-03-312019-12-312019-09-302019-06-302019-03-31
Value99999
Percentage of OperatingLeaseLeaseIncomeLoss1.51.41.51.51.4

us-gaap:ProductOrService, us-gaap:TypeOfArrangement

eqr:PetRent, eqr:ResidentialLeases



Period End2020-03-312019-12-312019-09-302019-06-302019-03-31
Value22222
Percentage of OperatingLeaseLeaseIncomeLoss0.40.40.50.50.5

eqr:ResidentialAndRetail, eqr:ResidentialLeases



Period End2020-03-312019-12-312019-09-302019-06-302019-03-31
Value612612611598592
Percentage of OperatingLeaseLeaseIncomeLoss92.586.095.095.192.5

eqr:ResidentialAndRetail, eqr:RetailLease



Period End2020-03-312019-12-312019-09-302019-06-302019-03-31
Value1817181718
Percentage of OperatingLeaseLeaseIncomeLoss2.72.42.92.82.9

eqr:StorageRent, eqr:ResidentialLeases



Period End2020-03-312019-12-312019-09-302019-06-302019-03-31
Value962000.0949000.0940000.0937000.0919000.0
Percentage of OperatingLeaseLeaseIncomeLoss0.10.10.10.10.1

eqr:StorageRent, eqr:RetailLease



Period End2020-03-312019-12-312019-09-302019-06-302019-03-31
Value19000.020000.020000.0-13000.044000.0
Percentage of OperatingLeaseLeaseIncomeLoss0.00.00.0-0.00.0

eqr:UtilityRecoveries, eqr:ResidentialLeases



Period End2020-03-312019-03-31
Value1716
Percentage of OperatingLeaseLeaseIncomeLoss2.62.6

eqr:UtilityRecoveries, eqr:RetailLease



Period End2020-03-312019-03-31
Value228000.0203000.0
Percentage of OperatingLeaseLeaseIncomeLoss0.00.0

us-gaap:Parking, eqr:ResidentialLeases



Period End2020-03-312019-12-312019-09-302019-06-302019-03-31
Value99999
Percentage of OperatingLeaseLeaseIncomeLoss1.51.41.51.51.4

us-gaap:Parking, eqr:RetailLease



Period End2020-03-312019-12-312019-09-302019-06-302019-03-31
Value97000.089000.0100000.087000.072000.0
Percentage of OperatingLeaseLeaseIncomeLoss0.00.00.00.00.0

us-gaap:TypeOfArrangement

eqr:ResidentialLeases



Period End2020-03-312019-12-312019-09-302019-06-302019-03-31
Value643693624611621
Percentage of OperatingLeaseLeaseIncomeLoss97.297.497.197.297.1

eqr:RetailLease



Period End2020-03-312019-12-312019-09-302019-06-302019-03-31
Value1818181718
Percentage of OperatingLeaseLeaseIncomeLoss2.82.62.92.82.9

eqr:OtherLiabilitiesLossFromInvestmentsInUnconsolidatedEntitiesMerger



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-31
Value000000000000000000000000040
Percentage of OtherLiabilitiesLossFromInvestmentsInUnconsolidatedEntitiesMerger100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0

dei:LegalEntity

eqr:ERPOP



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-31
Value327000.0329000.0317000.0334000.0343000.0343000.0333000.0337000.0350000.0338000.0347000.0358000.0372000.0373000.0371000.0387000.0395000.0394000.0583000.0676000.0662000.0825000.0
Percentage of OtherLiabilitiesLossFromInvestmentsInUnconsolidatedEntitiesMerger100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

eqr:PaymentsForCapitalExpendituresToRealEstate



Period End2020-03-312019-12-312019-03-312018-12-31
Value38503450
Percentage of PaymentsForCapitalExpendituresToRealEstate100.0100.0100.0100.0

dei:LegalEntity

eqr:ERPOP



Period End2020-03-312019-12-312019-03-312018-12-31
Value38503450
Percentage of PaymentsForCapitalExpendituresToRealEstate100.0100.0100.0100.0

eqr:PaymentsOfInterestCapitalizedForRealEstateUnderDevelopment



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value12211111136889131414
Percentage of PaymentsOfInterestCapitalizedForRealEstateUnderDevelopment100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

eqr:ERPOP



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value12211111136889131414
Percentage of PaymentsOfInterestCapitalizedForRealEstateUnderDevelopment100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:TypeOfArrangement

eqr:PercentageOfRentalIncome

eqr:ResidentialApartmentLeases



Period End2020-03-312019-12-312019-09-302019-06-302019-03-31
Value0.97-0.00100000000000000090.00.00100000000000000090.97
Percentage of PercentageOfRentalIncome100.0100.00.0100.0100.0

eqr:RetailCommercialLeases



Period End2020-03-312019-12-312019-09-302019-06-302019-03-31
Value0.030.00099999999999999740.0-0.00099999999999999740.03
Percentage of PercentageOfRentalIncome3.1-100.00.0-100.03.1

us-gaap:StatementEquityComponents

eqr:PreferredStockPreferenceUnitsDividendRatePercentage

us-gaap:PreferredStock



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value0.08290.00.00.00.08290.00.00.00.08290.00.00.00.0829
Percentage of PreferredStockPreferenceUnitsDividendRatePercentage100.00.00.00.0100.00.00.00.0100.00.00.00.0100.0

eqr:ProceedsFromSaleOfProperty



Period End2020-03-312019-12-312019-09-302018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-04-302015-03-312014-12-312014-09-302013-03-312012-03-312011-09-302011-06-302011-03-312010-12-31
Value3703743050416229035532198124324511263424878241491453641782975206210934261546
Percentage of ProceedsFromSaleOfProperty100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PropertyPlantAndEquipmentByType

eqr:ConsolidatedRentalProperties



Period End2020-03-312019-12-312019-09-302018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value37037430304160290355321947243140112631448
Percentage of ProceedsFromSaleOfProperty100.099.999.40.0100.00.0100.0100.0100.0100.058.7100.057.4100.099.6100.0

eqr:RepaymentsOfMortgageNotesPayable



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-11-082013-03-312012-03-312011-09-302011-03-312010-09-30
Value111111111115111222222222396333444
Percentage of RepaymentsOfMortgageNotesPayable100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

eqr:ERPOP



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-31
Value1111111111151112222222
Percentage of RepaymentsOfMortgageNotesPayable100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

eqr:RestrictedShareGrantsNet



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312014-03-312013-03-312012-03-31
Value163098.0-1858.02022.014048.0144390.0923.0-150.014766.0108261.0-2000.0-5641.014347.076745.0-1133.0-3831.015596.0137057.0162349.0210721.0128136.0
Percentage of RestrictedShareGrantsNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

eqr:ERPOP



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value163098.0-1858.02022.014048.0144390.0923.0-150.014766.0108261.0-2000.0-5641.014347.076745.0-1133.0-3831.015596.0137057.0
Percentage of RestrictedShareGrantsNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

eqr:SharesIssuedDuringPeriodSharesConversionOfUnitsToCommonShares



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value0000000000001
Percentage of SharesIssuedDuringPeriodSharesConversionOfUnitsToCommonShares100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

eqr:ERPOP



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value0000000000001
Percentage of SharesIssuedDuringPeriodSharesConversionOfUnitsToCommonShares100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PartnerTypeOfPartnersCapitalAccount, dei:LegalEntity

eqr:SupplementalExecutiveRetirementPlanSerp

us-gaap:GeneralPartner, eqr:ERPOP



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value149000.0-136000.00.0-937000.0-602000.079000.05000.0-621000.083000.00.072000.0-798000.0132000.0
Percentage of SupplementalExecutiveRetirementPlanSerp100.0100.00.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0

us-gaap:StatementEquityComponents

us-gaap:AdditionalPaidInCapital



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-31
Value00000000000000001200-21130-2-6
Percentage of SupplementalExecutiveRetirementPlanSerp100.0100.00.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:PartnerTypeOfPartnersCapitalAccount, dei:LegalEntity

eqr:UnitsLimitedPartnersDistributions

us-gaap:LimitedPartner, eqr:ERPOP



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value977777777
Percentage of UnitsLimitedPartnersDistributions100.0100.0100.0100.0100.0100.0100.0100.0100.0

eqr:UnrealizedGainLossOnDerivativeInstrumentsOtherLiabilities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-09-302011-06-302011-03-312010-12-312010-03-312009-12-312009-03-31
Value00017119-1-15001201-10118354-2-310031-5-543-10
Percentage of UnrealizedGainLossOnDerivativeInstrumentsOtherLiabilities100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

eqr:ERPOP



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-31
Value00017119-1-15001201-10118
Percentage of UnrealizedGainLossOnDerivativeInstrumentsOtherLiabilities100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

eqr:WriteOffOfPursuitCostsAccountsPayableAndAccruedExpenses



Period End2020-03-312019-12-312019-09-302018-12-312018-09-302017-12-312017-09-302017-06-302017-03-312016-12-312016-09-30
Value8000.08000.05000.00.019000.0104000.00.00.020000.00.03000.0
Percentage of WriteOffOfPursuitCostsAccountsPayableAndAccruedExpenses100.0100.0100.00.0100.0100.00.00.0100.00.0100.0

dei:LegalEntity

eqr:ERPOP



Period End2020-03-312019-12-312019-09-302018-12-312018-09-302017-12-312017-09-302017-06-302017-03-312016-12-312016-09-30
Value8000.08000.05000.00.019000.0104000.00.00.020000.00.03000.0
Percentage of WriteOffOfPursuitCostsAccountsPayableAndAccruedExpenses100.0100.0100.00.0100.0100.00.00.0100.00.0100.0

eqr:WriteOffOfPursuitCostsOtherAssets



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-312017-09-302017-06-302017-03-312016-12-312016-09-30
Value33000.014000.011000.026000.011000.040000.03000.00.0-4000.011000.010000.03000.09000.0
Percentage of WriteOffOfPursuitCostsOtherAssets100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0

dei:LegalEntity

eqr:ERPOP



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-312017-09-302017-06-302017-03-312016-12-312016-09-30
Value33000.014000.011000.026000.011000.040000.03000.00.0-4000.011000.010000.03000.09000.0
Percentage of WriteOffOfPursuitCostsOtherAssets100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0

eqr:WriteOffPursuitCostsInvestmentInRealEstate



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-30
Value111111110000000
Percentage of WriteOffPursuitCostsInvestmentInRealEstate100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

eqr:ERPOP



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-30
Value111111110000000
Percentage of WriteOffPursuitCostsInvestmentInRealEstate100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PartnerTypeOfPartnersCapitalAccount, dei:LegalEntity

us-gaap:AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationEmployeeStockPurchaseProgramRequisiteServicePeriodRecognition

us-gaap:GeneralPartner, eqr:ERPOP



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value153000.0140000.0137000.098000.0267000.0163000.0204000.0103000.0297000.0161000.0172000.0107000.0307000.0
Percentage of AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationEmployeeStockPurchaseProgramRequisiteServicePeriodRecognition100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StatementEquityComponents

us-gaap:AdditionalPaidInCapital



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-31
Value153000.0140000.0137000.098000.0267000.0163000.0204000.0103000.0297000.0161000.0172000.0107000.0307000.0160000.0133000.0184000.0173000.0192000.0159000.0121000.0412000.0158000.0114000.0110000.0477000.0311000.0743000.0
Percentage of AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationEmployeeStockPurchaseProgramRequisiteServicePeriodRecognition100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:PartnerTypeOfPartnersCapitalAccount, dei:LegalEntity

us-gaap:AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationRestrictedStockUnitsRequisiteServicePeriodRecognition

us-gaap:GeneralPartner, eqr:ERPOP



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value4223411222222
Percentage of AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationRestrictedStockUnitsRequisiteServicePeriodRecognition100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StatementEquityComponents

us-gaap:AdditionalPaidInCapital



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-31
Value4223411222222224522361124
Percentage of AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationRestrictedStockUnitsRequisiteServicePeriodRecognition100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:CommonStock



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-31
Value2000.00.00.00.02000.00.00.00.01000.00.00.00.01000.0-1000.00.01000.01000.00.00.00.02000.00.00.01000.01000.0
Percentage of AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationRestrictedStockUnitsRequisiteServicePeriodRecognition0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:PartnerTypeOfPartnersCapitalAccount, dei:LegalEntity

us-gaap:AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationStockOptionsRequisiteServicePeriodRecognition

us-gaap:GeneralPartner, eqr:ERPOP



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value0000000170014
Percentage of AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationStockOptionsRequisiteServicePeriodRecognition100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StatementEquityComponents

us-gaap:AdditionalPaidInCapital



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-31
Value000000017001400100010102334
Percentage of AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationStockOptionsRequisiteServicePeriodRecognition100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:PartnerTypeOfPartnersCapitalAccount, dei:LegalEntity

us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationOtherLongtermIncentivePlansRequisiteServicePeriodRecognition

us-gaap:LimitedPartner, eqr:ERPOP



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value5112722342222
Percentage of AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationOtherLongtermIncentivePlansRequisiteServicePeriodRecognition100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StatementEquityComponents

us-gaap:NoncontrollingInterest



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value511272234222222492
Percentage of AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationOtherLongtermIncentivePlansRequisiteServicePeriodRecognition100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.00.00.00.00.0

us-gaap:AmortizationOfAboveAndBelowMarketLeases



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-30
Value00000-1-1-1-1-1-10000
Percentage of AmortizationOfAboveAndBelowMarketLeases100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

eqr:ERPOP



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value0000011
Percentage of AmortizationOfAboveAndBelowMarketLeases100.0100.0100.0100.0100.0-100.0-100.0

us-gaap:AmortizationOfDebtDiscountPremium



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-09-302011-06-302011-03-312010-12-312010-03-312009-12-312009-03-31
Value11-716111811-1111000-19-1-2-1-3-4-2-2-2-7-1000-1021
Percentage of AmortizationOfDebtDiscountPremium100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

eqr:ERPOP



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-31
Value11-716111811-1111000-19-1-2-1-3-4
Percentage of AmortizationOfDebtDiscountPremium100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AmortizationOfDeferredHedgeGains



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-09-302011-06-302011-03-312010-12-312010-03-312009-12-312009-03-31
Value56544444444444442844444443830000001
Percentage of AmortizationOfDeferredHedgeGains100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

eqr:ERPOP



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-31
Value56544444444444442844444
Percentage of AmortizationOfDeferredHedgeGains100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AmortizationOfFinancingCosts



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
Value232322323222222253222-1923244734244322233332
Percentage of AmortizationOfFinancingCosts100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

eqr:ERPOP



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-30
Value23232232322222225322222
Percentage of AmortizationOfFinancingCosts100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0-12.9100.0

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value2332-224215-22270-5-66-218126-32
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

eqr:ERPOP



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value2332-224215-22270-5-66-218126-32
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StatementEquityComponents

us-gaap:CommonStockDividendsPerShareDeclared

eqr:Distributions



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value0.60250.56750000000000010.56750.56750.56750.540.540.540.54
Percentage of CommonStockDividendsPerShareDeclared100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:CostOfPropertyRepairsAndMaintenance



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
Value11510811410811510611010310898104991029710496109114122118124111120115125119117107110107112106103128112135125126123122116124
Percentage of CostOfPropertyRepairsAndMaintenance100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

eqr:ERPOP



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-30
Value11510811410811510611010310898104991029710496109114122118124112120
Percentage of CostOfPropertyRepairsAndMaintenance100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StatementBusinessSegments

eqr:SameStoreNonSameStoreAndOther



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value11510811410811510611010310898104991029710496109
Percentage of CostOfPropertyRepairsAndMaintenance100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:Depreciation



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
Value212214211200204201194192196200184179178177179176172181196194194193190190185277327205167172174164159167156173174152153144143141
Percentage of Depreciation100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

eqr:ERPOP



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-30
Value212214211200204201194192196200184179178177179176172181196194194193190
Percentage of Depreciation100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-31
Value-5-6-5-4-4-4-4-4-4-4-4-4-4-4-4-4-28-4-4-4-4-4
Percentage of DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DerivativeInstrumentRisk

eqr:ForwardStartingSwaps



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value-5-6-5-4-4-4-4-4-4-4-4-4-4-4-4-4-28
Percentage of DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DistributionMadeToLimitedPartnerCashDistributionsPaid



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value87777777666675077123
Percentage of DistributionMadeToLimitedPartnerCashDistributionsPaid100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

eqr:ERPOP



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value87777777666675077123
Percentage of DistributionMadeToLimitedPartnerCashDistributionsPaid100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PartnerTypeOfPartnersCapitalAccount

us-gaap:DistributionsPerLimitedPartnershipAndGeneralPartnershipUnitOutstandingBasic

eqr:Distributions



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value0.60250.56750000000000010.56750.56750.56750.540.540.540.54
Percentage of DistributionsPerLimitedPartnershipAndGeneralPartnershipUnitOutstandingBasic100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StatementEquityComponents

us-gaap:DividendsCommonStockCash

us-gaap:RetainedEarnings



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312010-03-31
Value22421021021021019919819819895
Percentage of DividendsCommonStockCash100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DividendsPreferredStock



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-30
Value000000000000000000000111111123333333
Percentage of DividendsPreferredStock100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StatementEquityComponents

us-gaap:DividendsPreferredStockCash

us-gaap:RetainedEarnings



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312010-03-31
Value0000000003
Percentage of DividendsPreferredStockCash100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:EquityMethodInvestmentDividendsOrDistributions



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-09-302011-06-302011-03-312010-12-312010-03-312009-12-312009-03-31
Value0001000000000000011101210000000000
Percentage of EquityMethodInvestmentDividendsOrDistributions100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0

dei:LegalEntity

eqr:ERPOP



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-31
Value0001000000000000011101
Percentage of EquityMethodInvestmentDividendsOrDistributions100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:GainLossOnSaleOfDerivatives



Period End2020-03-31
Value-25000.0
Percentage of GainLossOnSaleOfDerivatives100.0

dei:LegalEntity

eqr:ERPOP



Period End2020-03-31
Value-25000.0
Percentage of GainLossOnSaleOfDerivatives100.0

us-gaap:GainsLossesOnSalesOfInvestmentRealEstate



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-30
Value207178130138001140142151787361739057372339661487984113140000
Percentage of GainsLossesOnSalesOfInvestmentRealEstate100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.00.00.00.0

dei:LegalEntity

eqr:ERPOP



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-30
Value207178130138001140142151787361739057372339661487984113
Percentage of GainsLossesOnSalesOfInvestmentRealEstate100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncomeLossAttributableToNoncontrollingInterest



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-30
Value111091134848457511881438711788430-1-6510-10000
Percentage of IncomeLossAttributableToNoncontrollingInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
Value3332992772521101231101187911512711795130115172-117313913710713711710983-6-57-106132361735177-46-14-2-851411
Percentage of IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

eqr:ERPOP



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-30
Value3332992772521101231101187911512711795130115172-1173139137107137117
Percentage of IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncomeLossFromEquityMethodInvestments



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
Value-10-168000-10-100-1-170-10-11222-1-7-1-1-100000000000-20
Percentage of IncomeLossFromEquityMethodInvestments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.00.00.00.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

eqr:ERPOP



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-30
Value-10-168000-10-100-1-170-10-11222-1
Percentage of IncomeLossFromEquityMethodInvestments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

us-gaap:IncomeLossIncludingPortionAttributableToNoncontrollingInterest

eqr:ERPOP



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-30
Value3192992763191071202221172191291422021482872152263730211203296185225229
Percentage of IncomeLossIncludingPortionAttributableToNoncontrollingInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInAccountsPayableAndAccruedLiabilities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-09-302011-06-302011-03-312010-12-312010-03-312009-12-312009-03-31
Value62-5235-4163-6033-2348-5138-1742-4733-2532-6541-2345-5837-1655474125-944-7139-7019
Percentage of IncreaseDecreaseInAccountsPayableAndAccruedLiabilities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

eqr:ERPOP



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-31
Value62-5235-4163-6033-2348-5138-1742-4733-2532-6541-2345-58
Percentage of IncreaseDecreaseInAccountsPayableAndAccruedLiabilities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInInterestPayableNet



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-09-302011-06-302011-03-312010-12-312010-03-312009-12-312009-03-31
Value0-69-911-65-611-1423-2513-811-11-150-12-438001-8-2220-2627-3228-38
Percentage of IncreaseDecreaseInInterestPayableNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

eqr:ERPOP



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-31
Value0-69-911-65-611-1423-2513-811-11-150-12-43
Percentage of IncreaseDecreaseInInterestPayableNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInOtherOperatingAssets



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-09-302011-06-302011-03-312010-12-312010-03-312009-12-312009-03-31
Value18-2722-1514-2218-1515-22-162811-2625-12-1716290-4-2511-261815-12-710-52-1-7-6
Percentage of IncreaseDecreaseInOtherOperatingAssets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

eqr:ERPOP



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-31
Value18-2722-1514-2218-1515-22-162811-2625-12-17162004-17
Percentage of IncreaseDecreaseInOtherOperatingAssets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.069.6-100.0-100.069.9

us-gaap:IncreaseDecreaseInOtherOperatingLiabilities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-09-302011-06-302011-03-312010-12-312010-03-312009-12-312009-03-31
Value-202890-2515-17-44412-45-117-18-23716-2-88178-26-18-1616-2814-208-24
Percentage of IncreaseDecreaseInOtherOperatingLiabilities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

eqr:ERPOP



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-31
Value-202890-2515-17-44412-45-117-18-23716-2-88
Percentage of IncreaseDecreaseInOtherOperatingLiabilities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInSecurityDeposits



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-09-302011-06-302011-03-312010-12-312010-03-312009-12-312009-03-31
Value0010100200100-100-1300000111-50100-13-10
Percentage of IncreaseDecreaseInSecurityDeposits100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

eqr:ERPOP



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-31
Value0010100200100-100-1300000
Percentage of IncreaseDecreaseInSecurityDeposits100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:InterestAndOtherIncome



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-30
Value10010071503100556300601020000700050102
Percentage of InterestAndOtherIncome100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

eqr:ERPOP



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-30
Value100100715031005563006010
Percentage of InterestAndOtherIncome100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0140.8100.0100.0

us-gaap:InterestPaidNet



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-09-302011-06-302011-03-312010-12-312010-03-312009-12-312009-03-31
Value75957596748980929610260110869869932201081091051131071081141121821251389614697144111159
Percentage of InterestPaidNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

eqr:ERPOP



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-31
Value7595759674898092961026011086986993220108109105113107
Percentage of InterestPaidNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:MinorityInterestChangeInRedemptionValue



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-09-302011-06-302011-03-312010-12-31
Value-111-325715501413-12-12020-50-1-14-43-554434-554120911-36-44-5037-57122921
Percentage of MinorityInterestChangeInRedemptionValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StatementEquityComponents

us-gaap:AdditionalPaidInCapital



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-09-302011-06-302011-03-312010-12-31
Value11132-57-1-550-14-1312120-20501144355-44-3455-41-7011-36-4450-3757-12-29-21
Percentage of MinorityInterestChangeInRedemptionValue-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0-33.5100.0100.0100.0-100.0-100.0-100.0-100.0-100.0-100.0

us-gaap:PartnerTypeOfPartnersCapitalAccount, dei:LegalEntity

us-gaap:MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders

us-gaap:PartiallyOwnedProperties, eqr:ERPOP



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value9011301341005
Percentage of MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StatementEquityComponents

eqr:PartiallyOwned



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value9011301341005
Percentage of MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:NoncontrollingInterest



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value977777777666675071227
Percentage of MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders97.41050.1600.8597.4191.7790.5569.4208.4170.3464.2719.8787.1130.40.00.00.00.00.0

dei:LegalEntity

us-gaap:NetIncomeLossAllocatedToGeneralPartners

eqr:ERPOP



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-30
Value3072882663081031162141122111241371951422762072183586202195285178216220
Percentage of NetIncomeLossAllocatedToGeneralPartners100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PartnerTypeOfPartnersCapitalAccount, dei:LegalEntity

us-gaap:GeneralPartner, eqr:ERPOP



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value307288266308103116214112211124137195142
Percentage of NetIncomeLossAllocatedToGeneralPartners100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

us-gaap:NetIncomeLossAllocatedToLimitedPartners

eqr:ERPOP



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-30
Value111091134848457511881438711788
Percentage of NetIncomeLossAllocatedToLimitedPartners100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PartnerTypeOfPartnersCapitalAccount, dei:LegalEntity

us-gaap:LimitedPartner, eqr:ERPOP



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value1110911348484575
Percentage of NetIncomeLossAllocatedToLimitedPartners100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:NoncashProjectAbandonmentCosts



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-09-302011-06-302011-03-312010-12-312010-03-312009-12-312009-03-31
Value1111111100000001100101010211111120
Percentage of NoncashProjectAbandonmentCosts100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

eqr:ERPOP



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-31
Value1111111100000001100101
Percentage of NoncashProjectAbandonmentCosts100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OperatingLeasesIncomeStatementLeaseRevenue



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
Value682683685669662652652639632630623612603605605594616701694676664662662649630626632537553541525509496518468525507486499477477480
Percentage of OperatingLeasesIncomeStatementLeaseRevenue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

eqr:ERPOP



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-30
Value682683685669662652652639632630623612603605605594616701694676664662662
Percentage of OperatingLeasesIncomeStatementLeaseRevenue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProductOrService

eqr:OtherRentalIncome



Period End2020-03-312019-03-31
Value2021
Percentage of OperatingLeasesIncomeStatementLeaseRevenue3.03.3

us-gaap:StatementBusinessSegments

eqr:NonSameStoreAndOther



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value3388353839564739426736404353313570
Percentage of OperatingLeasesIncomeStatementLeaseRevenue5.012.95.25.86.08.77.26.36.710.75.96.77.28.85.25.911.4

eqr:SameStore



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312011-09-302011-06-302010-09-302010-06-30
Value648595649630622595605599590563587571560552574559545457450433429
Percentage of OperatingLeasesIncomeStatementLeaseRevenue95.087.194.894.294.091.392.893.793.389.394.193.392.891.294.894.188.689.890.882.584.6

eqr:SameStoreNonSameStoreAndOther



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value682683685669662652652639632630623612603605605594616
Percentage of OperatingLeasesIncomeStatementLeaseRevenue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StatementGeographical, us-gaap:StatementBusinessSegments

eqr:Boston, eqr:SameStore



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value6357595861555656
Percentage of OperatingLeasesIncomeStatementLeaseRevenue9.38.58.78.79.38.58.78.8

eqr:Denver, eqr:SameStore



Period End2020-03-312019-03-31
Value44
Percentage of OperatingLeasesIncomeStatementLeaseRevenue0.70.7

eqr:LosAngeles, eqr:SameStore



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value121117122117119114118111
Percentage of OperatingLeasesIncomeStatementLeaseRevenue17.917.217.917.518.017.618.217.4

eqr:NonSameStore, eqr:NonSameStoreAndOther



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value29603236534817
Percentage of OperatingLeasesIncomeStatementLeaseRevenue4.38.84.75.50.95.31.32.7

eqr:OrangeCounty, eqr:SameStore



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value2626262625252525
Percentage of OperatingLeasesIncomeStatementLeaseRevenue3.93.93.93.93.93.93.93.9

eqr:Other, eqr:NonSameStoreAndOther



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value4283225391612
Percentage of OperatingLeasesIncomeStatementLeaseRevenue0.64.10.50.33.86.12.52.0

eqr:SanDiego, eqr:SameStore



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value2423242323232322
Percentage of OperatingLeasesIncomeStatementLeaseRevenue3.53.53.53.53.53.63.63.6

eqr:SanFrancisco, eqr:SameStore



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value121120127123118117122118
Percentage of OperatingLeasesIncomeStatementLeaseRevenue17.917.618.618.417.817.918.718.5

eqr:Seattle, eqr:SameStore



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value6452605561505853
Percentage of OperatingLeasesIncomeStatementLeaseRevenue9.57.78.88.39.37.78.98.4

eqr:SouthernCalifornia, eqr:SameStore



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value172168173166168163167159
Percentage of OperatingLeasesIncomeStatementLeaseRevenue25.324.625.324.925.525.125.724.9

stpr:DC, eqr:SameStore



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value1038211111210180108110
Percentage of OperatingLeasesIncomeStatementLeaseRevenue15.212.016.316.815.312.316.717.2

stpr:NY, eqr:SameStore



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value116113117113114111114110
Percentage of OperatingLeasesIncomeStatementLeaseRevenue17.116.617.117.017.317.117.517.3

us-gaap:OtherComprehensiveIncomeLossNetOfTax



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-30
Value465-14-10-141610106684442255616-7-72-4-7-215100-86-104
Percentage of OtherComprehensiveIncomeLossNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

eqr:ERPOP



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-30
Value465-14-10-141610106684442255616-7-72
Percentage of OtherComprehensiveIncomeLossNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-30
Value-5-6-5-4-4-4-4-4-4-4-4-4-4-4-4-4-28-4-4-4-4-4-4-4-4-3-3-8-3
Percentage of OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

eqr:ERPOP



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-30
Value-5-6-5-4-4-4-4-4-4-4-4-4-4-4-4-4-28-4-4-4-4-4-4
Percentage of OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PartnerTypeOfPartnersCapitalAccount, dei:LegalEntity

us-gaap:AccumulatedOtherComprehensiveIncome, eqr:ERPOP



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value5654444444444
Percentage of OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0

us-gaap:StatementEquityComponents

us-gaap:AccumulatedOtherComprehensiveIncome



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-31
Value56544444444444442844444444
Percentage of OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0

us-gaap:OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodBeforeTax



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value000-19-14-18125611
Percentage of OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodBeforeTax100.00.00.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DerivativeInstrumentRisk

eqr:ForwardStartingSwaps



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value000-19-14-18125611
Percentage of OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodBeforeTax100.00.00.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
Value000-19-14-18125611300-1-20111-11-110-9-11-392-3-113-105-31657-37-72-1325092
Percentage of OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax100.00.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

eqr:ERPOP



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-30
Value000-19-14-18125611300-1-20111-11-110
Percentage of OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax100.00.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PartnerTypeOfPartnersCapitalAccount, dei:LegalEntity

us-gaap:AccumulatedOtherComprehensiveIncome, eqr:ERPOP



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value000-19-14-18125611
Percentage of OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax100.00.00.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StatementEquityComponents

us-gaap:AccumulatedOtherComprehensiveIncome



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-09-302011-06-302011-03-312010-12-312010-03-31
Value000-19-14-1812561100-1-20111-11-110-9-1123-105-31657-13
Percentage of OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax100.00.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherNonoperatingExpense



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
Value2625327332111-410120110-1641030249724223144100
Percentage of OtherNonoperatingExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

eqr:ERPOP



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-30
Value2625327332111-41012011014
Percentage of OtherNonoperatingExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0-11.7100.1

us-gaap:PaymentsForProceedsFromHedgeFinancingActivities



Period End2020-03-312019-12-312019-09-302018-12-312018-09-302018-06-302018-03-312017-12-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312010-12-312009-12-31
Value000-1600-10400000130000000
Percentage of PaymentsForProceedsFromHedgeFinancingActivities100.00.00.0100.00.00.0100.0100.0100.00.00.00.00.00.0100.0100.00.0100.0100.00.00.00.0

dei:LegalEntity

eqr:ERPOP



Period End2020-03-312019-12-312019-09-302018-12-312018-09-302018-06-302018-03-312017-12-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-31
Value000-1600-104000001300
Percentage of PaymentsForProceedsFromHedgeFinancingActivities100.00.00.0100.00.00.0100.0100.0100.00.00.00.00.00.0100.0100.00.0

us-gaap:PaymentsOfDividendsCommonStock



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-09-302011-06-302011-03-312010-12-312010-03-312009-12-312009-03-31
Value211210210210199198198198185185185184184128018418431222012012011811811801802342491689999132959392131
Percentage of PaymentsOfDividendsCommonStock100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

eqr:ERPOP



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value21121021021019919819819818518518518418412801841843122
Percentage of PaymentsOfDividendsCommonStock100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PaymentsOfDividendsMinorityInterest



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-09-302011-03-312010-09-30
Value9011301341005-10177123-167777779107464
Percentage of PaymentsOfDividendsMinorityInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

eqr:ERPOP



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value901130134100570026
Percentage of PaymentsOfDividendsMinorityInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0-7.512.512.421.8

us-gaap:PaymentsOfDividendsPreferredStockAndPreferenceStock



Period End2020-03-312019-12-312019-09-302018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-03-31
Value0011000000100000000111103333333333
Percentage of PaymentsOfDividendsPreferredStockAndPreferenceStock100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

eqr:ERPOP



Period End2020-03-312019-12-312019-09-302018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value001100000010000
Percentage of PaymentsOfDividendsPreferredStockAndPreferenceStock100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.00.0100.0100.0100.0

us-gaap:PaymentsOfFinancingCosts



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-09-302011-06-302011-03-312010-12-312010-03-312009-12-312009-03-31
Value07541400406120000060001001346100106
Percentage of PaymentsOfFinancingCosts100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

eqr:ERPOP



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-31
Value075414004061200000600
Percentage of PaymentsOfFinancingCosts100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0

us-gaap:PaymentsToAcquireEquityMethodInvestments



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-09-302011-03-31
Value500261102020111000182215360200
Percentage of PaymentsToAcquireEquityMethodInvestments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

eqr:ERPOP



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-31
Value50026110202011100018221
Percentage of PaymentsToAcquireEquityMethodInvestments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PaymentsToAcquireOtherInvestments



Period End2020-03-312019-12-312019-09-302019-06-302019-03-31
Value1000.00.00.018000.0251000.0
Percentage of PaymentsToAcquireOtherInvestments100.00.00.0100.0100.0

dei:LegalEntity

eqr:ERPOP



Period End2020-03-312019-12-312019-09-302019-06-302019-03-31
Value1000.00.00.018000.0251000.0
Percentage of PaymentsToAcquireOtherInvestments100.00.00.0100.0100.0

us-gaap:PaymentsToAcquireOtherPropertyPlantAndEquipment



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312011-03-312010-12-312010-03-312009-12-312009-03-31
Value3850464734505249365953503947504033475243385256443221000
Percentage of PaymentsToAcquireOtherPropertyPlantAndEquipment100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StatementBusinessSegments

eqr:NonSameStoreAndOther



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value0433222101101
Percentage of PaymentsToAcquireOtherPropertyPlantAndEquipment1.88.46.86.46.55.04.03.71.43.11.91.74.4

eqr:SameStore



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-30
Value374543443147504736575249374347
Percentage of PaymentsToAcquireOtherPropertyPlantAndEquipment98.291.693.293.693.595.096.096.398.696.998.198.395.691.795.1

us-gaap:StatementGeographical, us-gaap:StatementBusinessSegments

eqr:Boston, eqr:SameStore



Period End2020-03-312019-12-312019-09-30
Value556
Percentage of PaymentsToAcquireOtherPropertyPlantAndEquipment14.811.213.4

eqr:Denver, eqr:SameStore



Period End2020-03-31
Value184000.0
Percentage of PaymentsToAcquireOtherPropertyPlantAndEquipment0.5

eqr:LosAngeles, eqr:SameStore



Period End2020-03-312019-12-312019-09-30
Value987
Percentage of PaymentsToAcquireOtherPropertyPlantAndEquipment24.416.816.1

eqr:NonSameStore, eqr:NonSameStoreAndOther



Period End2020-03-312019-12-312019-09-30
Value032
Percentage of PaymentsToAcquireOtherPropertyPlantAndEquipment1.46.16.0

eqr:OrangeCounty, eqr:SameStore



Period End2020-03-312019-12-312019-09-30
Value212
Percentage of PaymentsToAcquireOtherPropertyPlantAndEquipment5.33.65.7

eqr:Other, eqr:NonSameStoreAndOther



Period End2020-03-312019-12-312019-09-30
Value010
Percentage of PaymentsToAcquireOtherPropertyPlantAndEquipment0.42.40.8

eqr:SanDiego, eqr:SameStore



Period End2020-03-312019-12-312019-09-30
Value111
Percentage of PaymentsToAcquireOtherPropertyPlantAndEquipment2.92.63.0

eqr:SanFrancisco, eqr:SameStore



Period End2020-03-312019-12-312019-09-30
Value485
Percentage of PaymentsToAcquireOtherPropertyPlantAndEquipment10.717.411.1

eqr:Seattle, eqr:SameStore



Period End2020-03-312019-12-312019-09-30
Value256
Percentage of PaymentsToAcquireOtherPropertyPlantAndEquipment5.311.613.2

eqr:SouthernCalifornia, eqr:SameStore



Period End2020-03-312019-12-312019-09-30
Value121111
Percentage of PaymentsToAcquireOtherPropertyPlantAndEquipment32.623.124.8

stpr:DC, eqr:SameStore



Period End2020-03-312019-12-312019-09-30
Value667
Percentage of PaymentsToAcquireOtherPropertyPlantAndEquipment17.813.016.0

stpr:NY, eqr:SameStore



Period End2020-03-312019-12-312019-09-30
Value676
Percentage of PaymentsToAcquireOtherPropertyPlantAndEquipment16.515.214.6

us-gaap:PaymentsToDevelopRealEstateAssets



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-31
Value52584447455224354049517210311214116215016816117814614913512312265353033293331353162
Percentage of PaymentsToDevelopRealEstateAssets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

eqr:ERPOP



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-31
Value525844474552243540495172103112141162150168161178146149
Percentage of PaymentsToDevelopRealEstateAssets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PreferredStockDividendsIncomeStatementImpact



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-30
Value773000.0772000.0773000.0772000.0773000.0772000.0773000.0772000.0773000.0773000.0772000.0773000.0773000.0773000.0773000.0772000.0
Percentage of PreferredStockDividendsIncomeStatementImpact100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProceedsFromIssuanceOfCommercialPaper



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-31
Value19052603556537903985440648583658110711771279129913094340013241439224111111550000
Percentage of ProceedsFromIssuanceOfCommercialPaper100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.00.0100.0100.0100.0100.0100.00.00.00.00.0

dei:LegalEntity

eqr:ERPOP



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-31
Value19052603556537903985440648583658110711771279129913094340013241439224111111550
Percentage of ProceedsFromIssuanceOfCommercialPaper100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.00.0100.0100.0100.0100.0100.00.0

us-gaap:ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlans



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312011-09-302011-06-302011-03-312010-12-312010-03-312009-12-312009-03-31
Value000010001000100101020202
Percentage of ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlans100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

eqr:ERPOP



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value00001000100010010
Percentage of ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlans100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProceedsFromLinesOfCredit



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-31
Value72016038550199521701220041509551800024620116155619971843
Percentage of ProceedsFromLinesOfCredit100.0100.0100.00.0100.0100.0100.00.0100.00.0100.0100.00.00.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

eqr:ERPOP



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-31
Value72016038550199521701220041509551800024620116155619971843
Percentage of ProceedsFromLinesOfCredit100.0100.0100.00.0100.0100.0100.00.0100.00.0100.0100.00.00.0100.0100.0100.0100.0100.0100.0

us-gaap:ProceedsFromMinorityShareholders



Period End2020-03-312019-12-312019-09-302018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-03-312010-12-312010-03-312009-12-312009-03-31
Value02000000000000000053000000
Percentage of ProceedsFromMinorityShareholders100.0100.00.00.00.00.0100.00.00.00.0100.00.00.00.00.00.00.00.0100.0100.0100.00.00.0100.00.0100.0

dei:LegalEntity

eqr:ERPOP



Period End2020-03-312019-12-312019-09-302018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312015-12-312014-12-31
Value0200000000000
Percentage of ProceedsFromMinorityShareholders100.0100.00.00.00.00.0100.00.00.00.0100.00.00.0

us-gaap:ProceedsFromOtherOperatingActivities



Period End2020-03-31
Value1
Percentage of ProceedsFromOtherOperatingActivities100.0

dei:LegalEntity

eqr:ERPOP



Period End2020-03-31
Value1
Percentage of ProceedsFromOtherOperatingActivities100.0

us-gaap:ProceedsFromPartnershipContribution



Period End2020-03-312018-12-312018-09-302018-06-302018-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-03-31
Value12000.00.00.00.01000.00.00.00.01000.00.02000.00.01000.00.00.00.03000.03000.05000.00.0
Percentage of ProceedsFromPartnershipContribution100.00.00.00.0100.00.00.00.0100.00.0100.00.0100.00.00.00.0100.0100.0100.00.0

dei:LegalEntity

eqr:ERPOP



Period End2020-03-312018-12-312018-09-302018-06-302018-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-31
Value12000.00.00.00.01000.00.00.00.01000.00.02000.00.01000.00.0
Percentage of ProceedsFromPartnershipContribution100.00.00.00.0100.00.00.00.0100.00.0100.00.0100.00.0

us-gaap:ProceedsFromSaleOfRealEstateHeldforinvestment



Period End2020-03-312019-12-312019-09-302018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-09-302011-06-302011-03-312010-12-312010-03-312009-12-312009-03-31
Value36837129904042284345221780240168111630347772361422981764802955204208935258538105157133
Percentage of ProceedsFromSaleOfRealEstateHeldforinvestment100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

eqr:ERPOP



Period End2020-03-312019-12-312019-09-302018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-31
Value3683712990404228434522178024016811163034777236142298
Percentage of ProceedsFromSaleOfRealEstateHeldforinvestment100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProceedsFromSecuredNotesPayable



Period End2020-03-312019-12-312019-09-302019-06-302019-03-31
Value0007288
Percentage of ProceedsFromSecuredNotesPayable100.0100.0100.0100.0100.0

dei:LegalEntity

eqr:ERPOP



Period End2020-03-312019-12-312019-09-302019-06-302019-03-31
Value0007288
Percentage of ProceedsFromSecuredNotesPayable100.0100.0100.0100.0100.0

us-gaap:DebtInstrument, us-gaap:LongtermDebtType

eqr:SecuredConventional, eqr:FloatingRateDebt



Period End2020-03-31
Value78000.0
Percentage of ProceedsFromSecuredNotesPayable100.0

us-gaap:LongtermDebtType

eqr:FloatingRateDebt



Period End2020-03-31
Value78000.0
Percentage of ProceedsFromSecuredNotesPayable100.0

us-gaap:ProceedsFromStockOptionsExercised



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-09-302011-06-302011-03-312010-12-312010-03-312009-12-312009-03-31
Value11101818292431118453805202231322630915718105032131910
Percentage of ProceedsFromStockOptionsExercised100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

eqr:ERPOP



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-31
Value111018182924311184538052022313226
Percentage of ProceedsFromStockOptionsExercised100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:RealEstateTaxesAndInsurance



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
Value979587919189878991828487817881778085848386798083827678686463555956565161565756545152
Percentage of RealEstateTaxesAndInsurance100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

eqr:ERPOP



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-30
Value9795879191898789918284878178817780858483867980
Percentage of RealEstateTaxesAndInsurance100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StatementBusinessSegments

eqr:SameStoreNonSameStoreAndOther



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value9795879191898789918284878178817780
Percentage of RealEstateTaxesAndInsurance100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:RepaymentsOfCommercialPaper



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-31
Value2291196052114135414044064705354711731105155011161015415001712108219514528140000
Percentage of RepaymentsOfCommercialPaper100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.00.0100.0100.0100.0100.0100.00.00.00.00.0

dei:LegalEntity

eqr:ERPOP



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-31
Value2291196052114135414044064705354711731105155011161015415001712108219514528140
Percentage of RepaymentsOfCommercialPaper100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.00.0100.0100.0100.0100.0100.00.0

us-gaap:RepaymentsOfLinesOfCredit



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312010-12-312010-09-30
Value740140385501995217012200415012201800024620116168622001956150419211568545501284870
Percentage of RepaymentsOfLinesOfCredit100.0100.0100.00.0100.0100.0100.00.0100.00.0100.0100.00.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0

dei:LegalEntity

eqr:ERPOP



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-31
Value740140385501995217012200415012201800024620116168622001956
Percentage of RepaymentsOfLinesOfCredit100.0100.0100.00.0100.0100.0100.00.0100.00.0100.0100.00.00.0100.0100.0100.0100.0100.0100.0

us-gaap:StockIssuedDuringPeriodSharesConversionOfUnits



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-30
Value41945.019540.0105994.03528.0184878.0118967.01016.06494.05000.01670.077328.04263.05577.026554.010400.017303.0154050.026375.011760.0
Percentage of StockIssuedDuringPeriodSharesConversionOfUnits100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-31
Value13606.010868.010132.08230.018901.014093.016463.09681.035177.013443.015083.09952.029808.017510.013334.017559.015506.015593.011996.010722.030151.011862.09488.09529.037928.037704.085837.0
Percentage of StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

eqr:ERPOP



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value13606.010868.010132.08230.018901.014093.016463.09681.035177.013443.015083.09952.029808.017510.013334.017559.015506.015593.0
Percentage of StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StockIssuedDuringPeriodSharesStockOptionsExercised



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-31
Value214521.0315002.0370374.0350603.0709071.0861592.0113921.035484.045391.0502610.0148127.0122804.072596.0195812.019598.017199.0582435.0573599.067937.044815.0770012.0609868.0624998.0357519.0493995.0268547.0690340.0
Percentage of StockIssuedDuringPeriodSharesStockOptionsExercised100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

eqr:ERPOP



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value214521.0315002.0370374.0350603.0709071.0861592.0113921.035484.045391.0502610.0148127.0122804.072596.0195812.019598.017199.0582435.0573599.0
Percentage of StockIssuedDuringPeriodSharesStockOptionsExercised100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StatementEquityComponents

us-gaap:StockIssuedDuringPeriodValueConversionOfUnits

us-gaap:NoncontrollingInterest



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value-10-40-4-30000-3000
Percentage of StockIssuedDuringPeriodValueConversionOfUnits100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PartnerTypeOfPartnersCapitalAccount

us-gaap:StockIssuedDuringPeriodValueEmployeeStockPurchasePlan

us-gaap:GeneralPartner



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value000010001
Percentage of StockIssuedDuringPeriodValueEmployeeStockPurchasePlan100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StatementEquityComponents

us-gaap:AdditionalPaidInCapital



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-09-302011-06-302011-03-312010-12-312010-03-31
Value00001000100010010100100011410202
Percentage of StockIssuedDuringPeriodValueEmployeeStockPurchasePlan100.099.9100.0100.0100.0100.0100.099.8100.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:PartnerTypeOfPartnersCapitalAccount, dei:LegalEntity

us-gaap:StockIssuedDuringPeriodValueStockOptionsExercised

us-gaap:GeneralPartner, eqr:ERPOP



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value11101818292431118453
Percentage of StockIssuedDuringPeriodValueStockOptionsExercised100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StatementEquityComponents

us-gaap:AdditionalPaidInCapital



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-09-302011-06-302011-03-312010-12-312010-03-31
Value111018182924311184538052022313226309157181050321319
Percentage of StockIssuedDuringPeriodValueStockOptionsExercised100.0100.0100.0100.0100.0100.0100.0100.099.9100.0100.0100.0100.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:CommonStock



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-09-302011-06-302011-03-312010-12-312010-03-31
Value2000.03000.04000.03000.07000.09000.01000.00.01000.05000.01000.01000.01000.02000.00.00.06000.06000.00.00.08000.07000.06000.03000.05000.03000.07000.03000.015000.011000.05000.07000.0
Percentage of StockIssuedDuringPeriodValueStockOptionsExercised0.00.00.00.00.00.00.00.00.10.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:UnrealizedGainLossOnInterestRateCashFlowHedgesPretaxAccumulatedOtherComprehensiveIncomeLoss



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-09-30
Value-7265-14-75-141610-77-183-6-8109-4-4-2126-5-6-161797-45163183190104
Percentage of UnrealizedGainLossOnInterestRateCashFlowHedgesPretaxAccumulatedOtherComprehensiveIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

us-gaap:WeightedAverageLimitedPartnershipAndGeneralPartnershipUnitsOutstandingBasic

eqr:ERPOP



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-30
Value384038338338203803803800379379379037937837803773773760375
Percentage of WeightedAverageLimitedPartnershipAndGeneralPartnershipUnitsOutstandingBasic100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

eqr:AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrentOtherThanInterestAndDividendPayable



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302009-12-31
Value1659415110815210218214616711416713716514719918621518725319320215320316816111816684104381057277359769803911158
Percentage of AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrentOtherThanInterestAndDividendPayable100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

eqr:ERPOP



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302014-12-31
Value16594151108152102182146167114167137165147199186215187253153
Percentage of AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrentOtherThanInterestAndDividendPayable100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

eqr:CommonSharesAndUnitsOutstanding



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312010-12-312009-12-31
Value386385385384384383382382382381381381380380380380380379378378378377376375375374374374374339317315314311303294
Percentage of CommonSharesAndUnitsOutstanding100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

eqr:ERPOP



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302014-12-312013-12-31
Value386385385384384383382382382381381381380380380380380379378377374
Percentage of CommonSharesAndUnitsOutstanding100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

eqr:DepreciableProperty



Period End2020-03-312019-12-312019-09-302018-12-31
Value21197213192116820435
Percentage of DepreciableProperty100.0100.0100.0100.0

dei:LegalEntity

eqr:ERPOP



Period End2020-03-312019-12-312019-09-302018-12-31
Value21197213192116820435
Percentage of DepreciableProperty100.0100.0100.0100.0

eqr:EscrowDepositsForMortgageAndReplacementReserves



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312008-12-31
Value191817182220181614131021686462615956545250484545434240413991091110101012121917201719
Percentage of EscrowDepositsForMortgageAndReplacementReserves100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

eqr:FairValueOfSerpInvestments



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312010-12-31
Value1261511461451421341441401381401361321301241201161141059699971048883787371706956557158
Percentage of FairValueOfSerpInvestments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FairValueByFairValueHierarchyLevel

us-gaap:FairValueInputsLevel1



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312010-12-31
Value1261511461451421341441401381401361321301241201161141059699971048883787371706956557158
Percentage of FairValueOfSerpInvestments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PropertyPlantAndEquipmentByType

eqr:LandUnderDevelopment

eqr:ProjectsUnderDevelopment



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312011-09-302011-06-302010-12-312010-09-302009-12-31
Value23232325252534393043616111111526262879106
Percentage of LandUnderDevelopment100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

eqr:LineOfCreditAndCommercialPaper



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-31
Value6121017354034449949934523429922976431419
Percentage of LineOfCreditAndCommercialPaper100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

eqr:ERPOP



Period End2020-03-312019-12-312019-09-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-31
Value612101735434449949934523429922976431419
Percentage of LineOfCreditAndCommercialPaper100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

eqr:NoncontrollingInterestsPartiallyOwnedProperties



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312008-12-31
Value41-1-1-5-2-2-11466610444441221221241251251271261101071057775747374-137789101125
Percentage of NoncontrollingInterestsPartiallyOwnedProperties100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

eqr:ERPOP



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302014-12-31
Value41-1-1-5-2-2-1146661044444124
Percentage of NoncontrollingInterestsPartiallyOwnedProperties100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

eqr:NumberOfUnitsInSameStoreProperties



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312011-03-312010-12-312010-12-312010-09-302010-06-302010-03-312009-12-312009-12-312009-09-30
Value74919.0-1149.075290.074236.074166.00.072561.072629.072204.0-168.072049.071354.071000.0-1609.072229.072781.071000.0-146.097737.097580.0-1775.0100196.0-336.0100984.082553.085509.0105902.0105604.0105612.0101312.0104922.0105730.0105612.0112363.0101312.0-4733.0117286.0105730.0112363.0112042.0-4733.0117286.0
Percentage of NumberOfUnitsInSameStoreProperties100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

eqr:OperatingAndFinanceLeaseLiability



Period End2020-03-312019-12-312019-09-302018-12-31
Value3303313330
Percentage of OperatingAndFinanceLeaseLiability100.0100.0100.00.0

dei:LegalEntity

eqr:ERPOP



Period End2020-03-312019-12-312019-09-30
Value330331333
Percentage of OperatingAndFinanceLeaseLiability100.0100.0100.0

eqr:OperatingAndFinanceLeaseRightOfUseAsset



Period End2020-03-312019-12-312019-09-302018-12-31
Value5075124810
Percentage of OperatingAndFinanceLeaseRightOfUseAsset100.0100.0100.00.0

dei:LegalEntity

eqr:ERPOP



Period End2020-03-312019-12-312019-09-30
Value507512481
Percentage of OperatingAndFinanceLeaseRightOfUseAsset100.0100.0100.0

eqr:OtherRestrictedCash



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302009-12-31
Value000017110000000020000000000114444346681012
Percentage of OtherRestrictedCash100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PartnerTypeOfPartnersCapitalAccount, dei:LegalEntity

eqr:PartnersCapitalAttributableToParent

us-gaap:AccumulatedOtherComprehensiveIncome, eqr:ERPOP



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312015-12-312014-12-31
Value-72-77-84-89-75-64-50-67-77-88-94-101-109-113-152-172
Percentage of PartnersCapitalAttributableToParent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:GeneralPartner, eqr:ERPOP



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312015-12-312014-12-31
Value10565103551022910206100841020010248102381032910293103161035410352103051058510490
Percentage of PartnersCapitalAttributableToParent-14494.6-13351.5-12164.6-11359.2-13443.8-15697.1-20219.0-15210.9-13288.4-11616.7-10897.0-10236.6-9469.2-9047.3-6963.2-6093.8

us-gaap:LimitedPartner, eqr:ERPOP



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312015-12-312014-12-31
Value235227226227225228233232234226228229228221221214
Percentage of PartnersCapitalAttributableToParent-323.2-293.7-268.8-253.0-300.1-352.0-461.3-346.2-301.8-255.8-241.2-226.4-209.2-194.3-145.6-124.5

us-gaap:PreferredStock, eqr:ERPOP



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312015-12-312014-12-31
Value37373737373737373737373737373750
Percentage of PartnersCapitalAttributableToParent-51.1-48.1-44.3-41.5-49.7-57.4-73.5-55.4-48.0-42.1-39.4-36.9-34.1-32.7-24.5-29.0

eqr:PropertiesContractedToBeDisposed



Period End2020-03-312019-09-302019-06-302019-03-312015-07-312015-04-302014-10-312014-06-302014-03-312013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-31
Value1.01.07.03.02.02.03.06.04.02.07.050.05.08.03.06.0-2.0-1.07.0
Percentage of PropertiesContractedToBeDisposed100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DisposalGroupClassification, us-gaap:RealEstateProperties

eqr:RentalPropertiesDisposedOf, us-gaap:ConsolidatedProperties



Period End2020-03-312019-09-302019-06-302019-03-31
Value1.01.07.02.0
Percentage of PropertiesContractedToBeDisposed100.0100.0100.066.7

us-gaap:DisposalGroupClassification, us-gaap:RealEstateProperties, us-gaap:SubsequentEventType

eqr:RentalPropertiesDisposedOf, us-gaap:ConsolidatedProperties, us-gaap:SubsequentEvent



Period End2020-02-20
Value4.0
Percentage of PropertiesContractedToBeDisposed0.0

us-gaap:SubsequentEventType

us-gaap:SubsequentEvent



Period End2020-02-202019-02-212018-08-022018-02-162017-04-282017-02-172016-10-282016-07-29
Value4.01.01.02.02.02.07.09.0
Percentage of PropertiesContractedToBeDisposed0.00.00.00.00.00.00.00.0

eqr:RedeemableLimitedPartners



Period End2020-03-312019-12-312019-03-312018-12-312017-12-312016-12-31
Value353463432379367442
Percentage of RedeemableLimitedPartners100.0100.0100.0100.0100.0100.0

dei:LegalEntity

eqr:ERPOP



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302014-12-312013-12-312012-12-31
Value353463494436432379381366354366380380359442441478521566522500363398
Percentage of RedeemableLimitedPartners100.0100.00.00.0100.0100.00.00.00.0100.00.00.00.0100.00.00.00.00.00.00.00.00.0

eqr:RedeemableNoncontrollingInterestsOperatingPartnership



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312008-12-31
Value353463495436432379381366354366359442441478521566522488541500430440405363376407386398414452457416378438416383357313295258264
Percentage of RedeemableNoncontrollingInterestsOperatingPartnership100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FairValueByFairValueHierarchyLevel

us-gaap:FairValueInputsLevel2



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302014-12-31
Value353463494436432379381366354366359442441478521566522488500
Percentage of RedeemableNoncontrollingInterestsOperatingPartnership100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

eqr:ResidentSecurityAndUtilityDeposits



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-03-312010-12-312010-09-302009-12-31
Value3737363636353535343535363637383938484746464647464544445945444241434041404139
Percentage of ResidentSecurityAndUtilityDeposits100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

eqr:RestrictedDepositsOnRealEstateInvestments



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312010-12-31
Value00010000000000234671317243336445353535844444343430
Percentage of RestrictedDepositsOnRealEstateInvestments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0

eqr:SalesPriceForCommitmentsToDispose



Period End2020-03-312019-09-302019-06-302019-03-312015-07-312015-04-302014-10-312014-06-302014-03-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-31
Value331309341539134711563602242794247201214127454127-158-66240
Percentage of SalesPriceForCommitmentsToDispose100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DisposalGroupClassification, us-gaap:RealEstateProperties

eqr:RentalPropertiesDisposedOf, us-gaap:ConsolidatedProperties



Period End2020-03-312019-09-302019-06-302019-03-31
Value276254336282
Percentage of SalesPriceForCommitmentsToDispose83.482.198.852.3

us-gaap:DisposalGroupClassification, us-gaap:RealEstateProperties, us-gaap:SubsequentEventType

eqr:RentalPropertiesDisposedOf, us-gaap:ConsolidatedProperties, us-gaap:SubsequentEvent



Period End2020-02-20
Value723
Percentage of SalesPriceForCommitmentsToDispose0.0

us-gaap:PropertyPlantAndEquipmentByType

us-gaap:Land



Period End2020-03-312019-09-302019-06-302019-03-31
Value555541
Percentage of SalesPriceForCommitmentsToDispose16.617.91.20.4

us-gaap:PropertyPlantAndEquipmentByType, us-gaap:SubsequentEventType

us-gaap:Land, us-gaap:SubsequentEvent



Period End2020-02-202018-04-272018-02-162017-10-272017-07-28
Value5522257
Percentage of SalesPriceForCommitmentsToDispose0.00.00.00.00.0

us-gaap:SubsequentEventType

us-gaap:SubsequentEvent



Period End2020-02-202019-02-212018-08-022018-04-272018-02-162017-10-272017-07-282017-04-282017-02-172016-10-282016-07-29
Value7782394162179257221134301227
Percentage of SalesPriceForCommitmentsToDispose0.00.00.00.00.00.00.00.00.00.00.0

eqr:UnitsContractedToBeDisposed



Period End2020-03-312019-09-302019-06-302019-03-312015-07-312015-04-302014-10-312014-06-302014-03-312013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-31
Value517.0939.0940.01037.0522.0513.0529.02005.01360.0688.01566.013772.01578.02177.0699.01169.0-1610.0-836.02797.0
Percentage of UnitsContractedToBeDisposed100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DisposalGroupClassification, us-gaap:RealEstateProperties

eqr:RentalPropertiesDisposedOf, us-gaap:ConsolidatedProperties



Period End2020-03-312019-09-302019-06-302019-03-31
Value517.0939.0940.0593.0
Percentage of UnitsContractedToBeDisposed100.0100.0100.057.2

us-gaap:DisposalGroupClassification, us-gaap:RealEstateProperties, us-gaap:SubsequentEventType

eqr:RentalPropertiesDisposedOf, us-gaap:ConsolidatedProperties, us-gaap:SubsequentEvent



Period End2020-02-20
Value1416.0
Percentage of UnitsContractedToBeDisposed0.0

us-gaap:SubsequentEventType

us-gaap:SubsequentEvent



Period End2020-02-202019-02-212018-08-022018-02-162017-04-282017-02-172016-10-282016-07-29
Value1416.0266.0506.0455.0600.0592.01754.01344.0
Percentage of UnitsContractedToBeDisposed0.00.00.00.00.00.00.00.0

eqr:UnitsOutstanding



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312015-12-312014-12-312011-09-302011-06-302011-03-312010-12-312010-09-302009-12-312008-12-312007-12-31
Value131313131313141414131313131414141313131313141618
Percentage of UnitsOutstanding100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

eqr:ERPOP



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312015-12-312014-12-31
Value13131313131314141413131313141414
Percentage of UnitsOutstanding100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

eqr:UnitsOwnershipInterestInOperatingPartnership



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-31
Value0.0360.0360.0360.0360.0360.0360.0370.0370.0370.0360.0360.0360.0360.0380.0380.0380.03780.0410.0430.0450.048
Percentage of UnitsOwnershipInterestInOperatingPartnership100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

eqr:ERPOP



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312015-12-312014-12-31
Value0.0360.0360.0360.0360.0360.0360.0370.0370.0370.0360.0360.0360.0360.0380.0380.038
Percentage of UnitsOwnershipInterestInOperatingPartnership100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AdditionalPaidInCapital



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312008-12-31
Value9092896589178949892589358900890589108886884888388846875887418718865885728584860785398536857485278541856185428496849265425364522651525047503249474898474145034524450844774273
Percentage of AdditionalPaidInCapital100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-312015-12-31
Value1401168430993116888894100219155
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

eqr:ERPOP



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-312015-12-31
Value1401168430993116888894100219155
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:CommercialPaper



Period End2020-03-312019-12-312019-11-042019-11-032018-12-31
Value100010001000500500
Percentage of CommercialPaper100.0100.0100.0100.0100.0

us-gaap:CreditFacility

eqr:UnsecuredRevolvingCreditFacility



Period End2020-03-312019-12-312018-12-31
Value6131000500
Percentage of CommercialPaper61.3100.0100.0

us-gaap:DebtInstrumentCumulativeSinkingFundPayments



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302013-12-31
Value10987119864311161585654525047454341393733
Percentage of DebtInstrumentCumulativeSinkingFundPayments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis

us-gaap:DebtInstrumentFairValue

us-gaap:FairValueInputsLevel2, us-gaap:EstimateOfFairValueFairValueDisclosure



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302016-12-31
Value887396079560957191798833875187358719923592709191
Percentage of DebtInstrumentFairValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis, us-gaap:LongtermDebtType

us-gaap:FairValueInputsLevel2, us-gaap:EstimateOfFairValueFairValueDisclosure, us-gaap:SecuredDebt



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value19721930196126022352
Percentage of DebtInstrumentFairValue22.220.120.527.226.6

us-gaap:FairValueInputsLevel2, us-gaap:EstimateOfFairValueFairValueDisclosure, us-gaap:UnsecuredDebt



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value69017677759969686481
Percentage of DebtInstrumentFairValue77.879.979.572.873.4

us-gaap:FairValueByMeasurementBasis

us-gaap:CarryingReportedAmountFairValueDisclosure



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302016-12-31
Value863290368991913089528817882387728659895789928987
Percentage of DebtInstrumentFairValue97.394.194.095.497.599.8100.8100.499.397.097.097.8

us-gaap:FairValueByMeasurementBasis, us-gaap:LongtermDebtType

us-gaap:CarryingReportedAmountFairValueDisclosure, us-gaap:SecuredDebt



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value19401941196225992385
Percentage of DebtInstrumentFairValue21.920.220.527.227.0

us-gaap:CarryingReportedAmountFairValueDisclosure, us-gaap:UnsecuredDebt



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value66917095702965316432
Percentage of DebtInstrumentFairValue75.473.873.568.272.8

us-gaap:CreditFacility

us-gaap:DebtWeightedAverageInterestRate

us-gaap:RevolvingCreditFacility



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-31
Value0.02240.03120.03140.03250.03250.02970.02650.02290.02290.020.0137
Percentage of DebtWeightedAverageInterestRate100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DebtInstrument

eqr:Notes



Period End2020-03-312019-12-312018-12-31
Value0.04050.04210.0425
Percentage of DebtWeightedAverageInterestRate180.8134.9143.1

us-gaap:LongtermDebtType

us-gaap:CommercialPaper



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-31
Value0.01950.02420.02610.02730.02750.02350.02230.02160.01940.01410.009
Percentage of DebtWeightedAverageInterestRate87.177.683.184.084.679.184.294.384.770.565.7

us-gaap:Mortgages



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-31
Value0.03730.03840.0390.04010.04010.04150.04190.04220.04240.04330.0434
Percentage of DebtWeightedAverageInterestRate166.5123.1124.2123.4123.4139.7158.1184.3185.2216.5316.8

us-gaap:Range, us-gaap:DerivativeInstrumentRisk

us-gaap:DerivativeFixedInterestRate

srt:Maximum, eqr:ForwardStartingSwaps



Period End2020-03-31
Value0.01045
Percentage of DerivativeFixedInterestRate100.0

srt:Minimum, eqr:ForwardStartingSwaps



Period End2020-03-31
Value0.00744
Percentage of DerivativeFixedInterestRate71.2

us-gaap:DerivativeInstrumentRisk

us-gaap:DerivativeLiabilities

eqr:ForwardStartingSwaps



Period End2020-03-312019-03-312018-12-312018-06-302018-03-31
Value0229-1-3
Percentage of DerivativeLiabilities100.0100.0100.0100.0100.0

us-gaap:DerivativeInstrumentRisk, us-gaap:FairValueByFairValueHierarchyLevel

eqr:ForwardStartingSwaps, us-gaap:FairValueInputsLevel2



Period End2020-03-312018-12-31
Value09
Percentage of DerivativeLiabilities100.0100.0

us-gaap:DevelopmentInProcess



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312008-12-31
Value225181143171135109134145961632933256666377617991073112210391240126913431046100686598877958550038719419818516011911597130499473429668855
Percentage of DevelopmentInProcess100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

eqr:ERPOP



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302014-12-31
Value225181143171135109134145961632933256666377617991073112210391343
Percentage of DevelopmentInProcess100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PropertyPlantAndEquipmentByType

eqr:LandHeldForDevelopment



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312011-03-312010-12-312010-09-302010-06-302009-12-31
Value38322636302826254036353835342836625870
Percentage of DevelopmentInProcess16.917.718.421.222.626.419.517.241.722.312.211.95.35.429.128.212.612.410.6

eqr:ProjectsUnderDevelopment



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302009-12-31
Value2021581191461098310010666120232264554521928869102419394562
Percentage of DevelopmentInProcess89.687.083.685.281.276.874.372.968.373.679.281.283.381.877.676.771.778.384.183.384.0

us-gaap:DividendsPayableCurrentAndNoncurrent



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312008-12-31
Value2322182182182182062062062061921921911911921331191191209209209208188188187187243149150150260108109109179106106106140102102102100141
Percentage of DividendsPayableCurrentAndNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

eqr:ERPOP



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302014-12-31
Value2322182182182182062062062061921921911911921331191191209209188
Percentage of DividendsPayableCurrentAndNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:EquityMethodInvestments



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value555252526258575858
Percentage of EquityMethodInvestments100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName

eqr:RealEstateTechnologyOrOther



Period End2020-03-312019-12-312019-09-302018-12-31
Value1511115
Percentage of EquityMethodInvestments28.622.722.19.4

us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName, us-gaap:VariableInterestEntitiesByClassificationOfEntity

eqr:OperatingProperty, eqr:VariableInterestEntityPrimaryBeneficiaryUnconsolidated



Period End2020-03-312019-12-312018-12-31
Value394042
Percentage of EquityMethodInvestments71.477.372.6

us-gaap:FiniteLivedIntangibleAssetAcquiredInPlaceLeases



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302013-12-31
Value496497496481488481477479473476469467470470469469465483515515512511509507502
Percentage of FiniteLivedIntangibleAssetAcquiredInPlaceLeases100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FixturesAndEquipmentGross



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312010-12-31
Value19411916187518131761172216841615157515481500144113741346131112691219120714971446140113651345130212731214119612011234134313621335131112921231
Percentage of FixturesAndEquipmentGross100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

us-gaap:GeneralPartnersCapitalAccount

eqr:ERPOP



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302014-12-31
Value1056510355102291020610084102001024810238103291029310316103541035210305101961124611152105851059510490
Percentage of GeneralPartnersCapitalAccount100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:InterestPayableCurrentAndNoncurrent



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312008-12-31
Value6566736474626963695872487460695869858687848986787878858688767882798869927198719768101113
Percentage of InterestPayableCurrentAndNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

eqr:ERPOP



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302014-12-31
Value6566736474626963695872487460695869858689
Percentage of InterestPayableCurrentAndNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:InvestmentBuildingAndBuildingImprovements



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302009-12-31
Value1875918904187961852918440182321817417852177481774317601172141695216913168291673516430163361852718328181091797418064179201784317509175551786218222143681458014550142941426213822138331404213995139271349712781
Percentage of InvestmentBuildingAndBuildingImprovements100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:LandAvailableForDevelopment



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312008-12-31
Value1029691110918987861029899112109118115138154168154127143184279306295393505569577353404372360325205214211235290251266252254
Percentage of LandAvailableForDevelopment100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

eqr:ERPOP



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302014-12-31
Value1029691110918987861029899112109118115138154168154184
Percentage of LandAvailableForDevelopment100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PropertyPlantAndEquipmentByType

eqr:LandHeldForDevelopment



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312011-03-312010-12-312010-09-302010-06-302009-12-31
Value6464647461616161626263737384183198228192181
Percentage of LandAvailableForDevelopment62.866.771.067.166.667.969.970.960.863.264.065.767.771.186.784.478.476.671.9

us-gaap:LiabilitiesFairValueDisclosure



Period End2020-03-312019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312010-12-31
Value12714516614614714514514113613213012412512111710697991231181039992838273112114113978410397
Percentage of LiabilitiesFairValueDisclosure100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FairValueByFairValueHierarchyLevel

us-gaap:FairValueInputsLevel1



Period End2020-03-312019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-06-302010-12-31
Value1261451421341441401381401361321301241201161141059699971049897888378737170695655715758
Percentage of LiabilitiesFairValueDisclosure99.2100.085.691.797.996.695.298.9100.0100.0100.0100.096.195.897.099.498.9100.078.988.194.897.795.0100.095.8100.063.361.660.957.965.768.90.059.8

us-gaap:FairValueInputsLevel2



Period End2020-03-312019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-06-302010-12-31
Value0023123461000045301026145240304144444029326539
Percentage of LiabilitiesFairValueDisclosure0.80.014.48.32.13.44.81.10.00.00.00.03.94.23.00.61.10.021.111.95.22.35.00.04.20.036.738.439.142.134.331.10.040.2

dei:LegalEntity

us-gaap:LimitedPartnersCapitalAccount

eqr:ERPOP



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302014-12-31
Value235227226227225228233232234226228229228221219241240221221214
Percentage of LimitedPartnersCapitalAccount100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:CreditFacility

us-gaap:LineOfCreditFacilityMaximumBorrowingCapacity

eqr:UnsecuredRevolvingCreditFacility



Period End2020-03-312019-12-312019-11-012019-10-312019-09-302019-06-302018-12-312016-11-302016-11-032016-11-022016-10-31
Value25002500250020002000200020002000200025002500
Percentage of LineOfCreditFacilityMaximumBorrowingCapacity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:MinorityInterestInOperatingPartnerships



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312008-12-31
Value235227226227225228233232234226228229228221219241240221221221219214213213215211213209205159147144123119120122115110106108114116137
Percentage of MinorityInterestInOperatingPartnerships100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:NotesPayable



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312008-12-31
Value6079607766756531593659335534553255305038514344564848484843604362436058765881587554305425542059235477547754765475537946305354535453555609461450965092518551854584457846095447
Percentage of NotesPayable100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

eqr:ERPOP



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302014-12-31
Value60796077667565315936593355345532553050385143445648484848436043624360587658815425
Percentage of NotesPayable100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DebtInstrument, us-gaap:LongtermDebtType

eqr:UnsecuredPublic, eqr:FixedRateDebt



Period End2020-03-312019-12-312018-12-312017-12-31
Value6079607754854591
Percentage of NotesPayable100.0100.092.591.1

us-gaap:NumberOfRealEstateProperties



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-09-302014-06-30
Value306.0309.0308.0309.0310.0307.0306.0304.0303.0305.0305.0301.0302.0302.0308.0315.0317.0394.0392.0388.0389.0396.0397.0
Percentage of NumberOfRealEstateProperties100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ConsolidatedEntities

us-gaap:VariableInterestEntityPrimaryBeneficiary



Period End2020-03-312019-12-31
Value16.017.0
Percentage of NumberOfRealEstateProperties5.25.5

us-gaap:RealEstateProperties

us-gaap:ConsolidatedProperties



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302015-12-312015-09-302015-06-302015-03-312014-09-302014-06-30
Value16.017.017.017.017.017.017.017.017.017.017.017.017.017.018.018.019.019.0361.0362.0368.019.0
Percentage of NumberOfRealEstateProperties5.25.55.55.55.55.55.65.65.65.65.65.65.65.65.85.74.84.893.093.192.94.8

us-gaap:WhollyOwnedProperties



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302015-09-30
Value289.0291.0290.0291.0290.0287.0286.0284.0282.0283.0283.0279.0280.0280.0285.0291.0365.0
Percentage of NumberOfRealEstateProperties94.494.294.294.293.593.593.593.493.192.892.892.792.792.792.592.493.1

us-gaap:NumberOfUnitsInRealEstateProperty



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-09-302014-06-30
Value79065.079962.080299.079624.080061.079482.079260.078645.078399.078611.078302.077034.077498.077458.078826.079458.083992.0109652.0109347.0108430.0108793.0111087.0111491.0
Percentage of NumberOfUnitsInRealEstateProperty100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ConsolidatedEntities

us-gaap:VariableInterestEntityPrimaryBeneficiary



Period End2020-03-312019-12-31
Value3399.03535.0
Percentage of NumberOfUnitsInRealEstateProperty4.34.4

us-gaap:RealEstateProperties

us-gaap:ConsolidatedProperties



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302015-12-312015-09-302015-06-302015-03-312014-09-302014-06-30
Value3399.03535.03535.03535.03535.03535.03535.03535.03535.03215.03215.03215.03215.03215.03471.03471.03771.03771.097438.097825.099789.03752.0
Percentage of NumberOfUnitsInRealEstateProperty4.34.44.44.44.44.44.54.54.54.14.14.24.14.24.44.43.43.489.989.989.83.4

us-gaap:WhollyOwnedProperties



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302015-09-30
Value75504.076265.076602.075927.075419.074840.074618.074003.073160.073598.073289.072021.072485.072445.073557.073853.098331.0
Percentage of NumberOfUnitsInRealEstateProperty95.595.495.495.494.294.294.194.193.393.693.693.593.593.593.392.989.9

us-gaap:OtherAssets



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312008-12-31
Value226233249227241404465433444425445445413398421398422422405383384383396409384404379390358170164161129187149151133148138138164213283
Percentage of OtherAssets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

eqr:ERPOP



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302014-12-31
Value226233249227241404465433444425445445413398421398422422405383
Percentage of OtherAssets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherLiabilities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312008-12-31
Value298346312302321358344344335341332324308350353333347366353355383389349331321347331318401304370430261291409306260304341312251272289
Percentage of OtherLiabilities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

eqr:ERPOP



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302014-12-31
Value298346312302321358344344335341332324308350353333347366353389
Percentage of OtherLiabilities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherLiabilitiesFairValueDisclosure



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312010-12-31
Value12615114614514213414414013814013613213012412011611410596999710498978883787371706956557158
Percentage of OtherLiabilitiesFairValueDisclosure100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FairValueByFairValueHierarchyLevel

us-gaap:FairValueInputsLevel1



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-06-302010-12-31
Value1261511461451421341441401381401361321301241201161141059699971049897888378737170695655715758
Percentage of OtherLiabilitiesFairValueDisclosure100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0

dei:LegalEntity

us-gaap:PartnersCapital

eqr:ERPOP



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302014-12-31
Value1076510543104081038010271104011046910441105231046910487105191050910450103341140211304106911070010582
Percentage of PartnersCapital100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PartnerTypeOfPartnersCapitalAccount, dei:LegalEntity

us-gaap:PartnersCapitalAttributableToNoncontrollingInterest

us-gaap:PartiallyOwnedProperties, eqr:ERPOP



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312015-12-312014-12-31
Value41-1-1-5-2-2-114666104124
Percentage of PartnersCapitalAttributableToNoncontrollingInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

us-gaap:PartnersCapitalIncludingPortionAttributableToNoncontrollingInterest

eqr:ERPOP



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302014-12-31
Value1077010544104061037910266103991046710439105251047310493105251051510460103381140611308106961070410707
Percentage of PartnersCapitalIncludingPortionAttributableToNoncontrollingInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PreferredStockSharesIssued



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312008-12-31
Value0000000000000000000001111111111111111111111
Percentage of PreferredStockSharesIssued100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PreferredStockSharesOutstanding



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312008-12-31
Value0000000000000000000001111111111111111111111
Percentage of PreferredStockSharesOutstanding100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PreferredStockValue



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312008-12-31
Value3737373737373737373737373737200200200200200208208208208208
Percentage of PreferredStockValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

us-gaap:PreferredUnitsPreferredPartnersCapitalAccounts

eqr:ERPOP



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302014-12-31
Value3737373737373737373737373737373737374050
Percentage of PreferredUnitsPreferredPartnersCapitalAccounts100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:RealEstateInvestmentPropertyAccumulatedDepreciation



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312008-12-31
Value7420727671717026690066966494633861736040584956715526536052555119497749055914573656005432531451704992480746544547443449124880477746584539440543074424433743134146397238773561
Percentage of RealEstateInvestmentPropertyAccumulatedDepreciation100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

eqr:ERPOP



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302014-12-31
Value74207276717170266900669664946338617360405849567155265360525551194977490559145432
Percentage of RealEstateInvestmentPropertyAccumulatedDepreciation100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:RealEstateInvestmentPropertyAtCost



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312008-12-31
Value27408275332735726995268372651126425261642595826026259482548925476253862536125247251202518228159280322779527675275742734127065268002674026988273642100821151210232053720407195381953719695197022004419414190311846518690
Percentage of RealEstateInvestmentPropertyAtCost100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

eqr:ERPOP



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302014-12-31
Value2740827533273572699526837265112642526164259582602625948254892547625386253612524725120251822815927675
Percentage of RealEstateInvestmentPropertyAtCost100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:RealEstateInvestmentPropertyNet



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312008-12-31
Value19988202562018519969199361981419930198261978519986200991981819949200262010520128201432027622244222952219522242222602217022072219932208622441229291609616270162451587815868151331522915271153651573015267150591458715128
Percentage of RealEstateInvestmentPropertyNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

eqr:ERPOP



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302014-12-31
Value1998820256201851996919936198141993019826197851998620099198181994920026201052012820143202762224422242
Percentage of RealEstateInvestmentPropertyNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:RedeemableNoncontrollingInterestEquityCarryingAmount



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302016-12-31
Value353463494436432379381366354366380380442
Percentage of RedeemableNoncontrollingInterestEquityCarryingAmount100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ReplacementReserveEscrow



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302013-12-31
Value8888988778774333333333334
Percentage of ReplacementReserveEscrow100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:RestrictedCash



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-31
Value3853383941483738353676
Percentage of RestrictedCash100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:RestrictedCashAndCashEquivalents



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312008-12-31
Value5871555864685554505036254767612977241551351032037284849110398197147250120193182152369361309180109108163352152
Percentage of RestrictedCashAndCashEquivalents100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

eqr:ERPOP



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302014-12-31
Value58715558646855545050362547676129772415513572
Percentage of RestrictedCashAndCashEquivalents100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:SecuredDebt



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312008-12-31
Value1940194119622599267123852789289428943618361937433766411941384147422347044891495249575086509051585167517462306247638038983948400440564111413643524583476248454754482547835036
Percentage of SecuredDebt100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

eqr:ERPOP



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302014-12-31
Value19401941196225992671238527892894289436183619374337664119413841474223470448915086
Percentage of SecuredDebt100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DebtInstrument, us-gaap:LongtermDebtType

eqr:SecuredConventional, eqr:FixedRateDebt



Period End2020-03-312019-12-312018-12-312017-12-31
Value1573157418852982
Percentage of SecuredDebt81.181.179.082.4

eqr:SecuredConventional, eqr:FloatingRateDebt



Period End2020-03-312019-12-312018-12-312017-12-31
Value7766
Percentage of SecuredDebt0.40.40.30.2

eqr:SecuredTaxExempt, eqr:FloatingRateDebt



Period End2020-03-312019-12-312018-12-312017-12-31
Value360359493629
Percentage of SecuredDebt18.618.520.717.4

us-gaap:LongtermDebtType

eqr:CreditEnhancedDebt



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312010-12-31
Value281281301345440440440563563598598598601601601610627668700700700700700700700700700700700362362362459455543
Percentage of SecuredDebt14.514.515.413.316.518.515.819.519.516.516.516.016.014.614.514.714.814.214.314.114.113.813.813.613.613.511.211.211.09.39.29.011.311.111.4

eqr:FloatingRateDebt



Period End2020-03-312019-12-312018-12-312017-12-31
Value367366500636
Percentage of SecuredDebt18.918.921.017.6

us-gaap:SecurityDepositLiability



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312008-12-31
Value69707069686767666465656363626464637776767575757472717171726668686565626060606262625964
Percentage of SecurityDepositLiability100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

eqr:ERPOP



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302014-12-31
Value6970706968676766646565636362646463777675
Percentage of SecurityDepositLiability100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312008-12-31
Value107701054410406103791026610399104671043910525104731049310525105151046010338114061130810696107041084410673107071071710628107191084510922106381043575276213610460185862585458755402520848634995514751745068
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Line plots across dimensions of each concept

us-gaap:OperatingExpenses us-gaap:StatementBusinessSegments


us-gaap:OperatingExpenses us-gaap:StatementGeographical, us-gaap:StatementBusinessSegments


us-gaap:OperatingExpenses us-gaap:StatementGeographical, us-gaap:StatementBusinessSegments


us-gaap:OperatingIncomeLoss us-gaap:StatementBusinessSegments


us-gaap:OperatingIncomeLoss us-gaap:StatementGeographical, us-gaap:StatementBusinessSegments


us-gaap:OperatingIncomeLoss us-gaap:StatementGeographical, us-gaap:StatementBusinessSegments


us-gaap:NetIncomeLossAttributableToNoncontrollingInterest us-gaap:StatementEquityComponents


us-gaap:StockholdersEquity us-gaap:StatementEquityComponents


us-gaap:MinorityInterest us-gaap:StatementEquityComponents


us-gaap:StockholdersEquity us-gaap:StatementEquityComponents