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CONSOLIDATED STATEMENT OF CHANGES IN CAPITAL OF ERP OPERATING LIMITED PARTNERSHIP (USD $) In Thousands, unless otherwise specified | Total USD ($) | Preferred Stock [Member] USD ($) | General Partner [Member] USD ($) | Limited Partner [Member] USD ($) | Accumulated Other Comprehensive Income (Loss) [Member] USD ($) | Partially Owned Properties [Member] USD ($) | Series N Preferred Stock [Member] USD ($) | Series N Preferred Stock [Member] Preferred Stock [Member]
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Balance, beginning of year at Dec. 31, 2011 |  | $ 200,000 eqr_PartnersCapitalIncludingPortionAttributableToNoncontrollingInterests / us-gaap_PartnerCapitalComponentsAxis = us-gaap_PreferredStockMember | $ 5,665,733 eqr_PartnersCapitalIncludingPortionAttributableToNoncontrollingInterests / us-gaap_PartnerCapitalComponentsAxis = us-gaap_GeneralPartnerMember | $ 119,536 eqr_PartnersCapitalIncludingPortionAttributableToNoncontrollingInterests / us-gaap_PartnerCapitalComponentsAxis = us-gaap_LimitedPartnerMember | $ (196,718)eqr_PartnersCapitalIncludingPortionAttributableToNoncontrollingInterests / us-gaap_PartnerCapitalComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | $ 74,306 eqr_PartnersCapitalIncludingPortionAttributableToNoncontrollingInterests / us-gaap_PartnerCapitalComponentsAxis = us-gaap_PartiallyOwnedPropertiesMember |  |
Preference Units |  |  |  |  |  |  |  |
Redemption of 6.48% Series N Cumulative Redeemable | 150,000 us-gaap_PaymentsForRepurchaseOfPreferredStockAndPreferenceStock | (150,000)us-gaap_PaymentsForRepurchaseOfPreferredStockAndPreferenceStock / us-gaap_PartnerCapitalComponentsAxis = us-gaap_PreferredStockMember |  |  |  |  | 150,000 us-gaap_PaymentsForRepurchaseOfPreferredStockAndPreferenceStock / us-gaap_StatementClassOfStockAxis = eqr_SeriesNPreferredStockMember |
Preferred Stock Preference Units Dividend Rate Percentage |  |  |  |  |  |  | 6.48%eqr_PreferredStockPreferenceUnitsDividendRatePercentage / us-gaap_StatementClassOfStockAxis = eqr_SeriesNPreferredStockMember | 6.48%eqr_PreferredStockPreferenceUnitsDividendRatePercentage / us-gaap_PartnerCapitalComponentsAxis = us-gaap_PreferredStockMember / us-gaap_StatementClassOfStockAxis = eqr_SeriesNPreferredStockMember
OP Unit Issuance: |  |  |  |  |  |  |  |
Conversion of OP Units held by Limited Partners into OP Units held by General Partner |  |  | 18,929 eqr_ExchangeOfOPUnitsBetweenLimitedPartnerAndGeneralPartner / us-gaap_PartnerCapitalComponentsAxis = us-gaap_GeneralPartnerMember | (18,929)eqr_ExchangeOfOPUnitsBetweenLimitedPartnerAndGeneralPartner / us-gaap_PartnerCapitalComponentsAxis = us-gaap_LimitedPartnerMember |  |  |  |
Issuance of OP Units |  |  | 1,388,583 eqr_IssuanceOfOpUnits / us-gaap_PartnerCapitalComponentsAxis = us-gaap_GeneralPartnerMember |  |  |  |  |
Exercise of EQR share options |  |  | 49,039 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised / us-gaap_PartnerCapitalComponentsAxis = us-gaap_GeneralPartnerMember |  |  |  |  |
EQR's Employee Share Purchase Plan (ESPP) |  |  | 5,399 us-gaap_StockIssuedDuringPeriodValueEmployeeStockPurchasePlan / us-gaap_PartnerCapitalComponentsAxis = us-gaap_GeneralPartnerMember |  |  |  |  |
Share-based employee compensation expense: |  |  |  |  |  |  |  |
EQR restricted shares |  |  | 8,936 us-gaap_AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationRestrictedStockUnitsRequisiteServicePeriodRecognition / us-gaap_PartnerCapitalComponentsAxis = us-gaap_GeneralPartnerMember |  |  |  |  |
EQR share options |  |  | 11,752 us-gaap_AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationStockOptionsRequisiteServicePeriodRecognition / us-gaap_PartnerCapitalComponentsAxis = us-gaap_GeneralPartnerMember |  |  |  |  |
EQR ESPP discount |  |  | 965 us-gaap_AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationEmployeeStockPurchaseProgramRequisiteServicePeriodRecognition / us-gaap_PartnerCapitalComponentsAxis = us-gaap_GeneralPartnerMember |  |  |  |  |
OP Units repurchased and retired |  |  | 0 eqr_PaymentsForRepurchaseOfOpUnits / us-gaap_PartnerCapitalComponentsAxis = us-gaap_GeneralPartnerMember |  |  |  |  |
Offering costs |  |  | (39,359)us-gaap_AdjustmentsToAdditionalPaidInCapitalStockIssuedIssuanceCosts / us-gaap_PartnerCapitalComponentsAxis = us-gaap_GeneralPartnerMember |  |  |  |  |
Premium on redemption of Preferred Shares - original issuance costs |  |  | 5,129 eqr_PremiumOnRedemptionOfPreferredSharesPreferenceUnitsOriginalIssuance / us-gaap_PartnerCapitalComponentsAxis = us-gaap_GeneralPartnerMember |  |  |  | 5,100 eqr_PremiumOnRedemptionOfPreferredSharesPreferenceUnitsOriginalIssuance / us-gaap_StatementClassOfStockAxis = eqr_SeriesNPreferredStockMember |
Net income available to Units - General Partner |  |  | 826,212 us-gaap_NetIncomeLossAllocatedToGeneralPartners / us-gaap_PartnerCapitalComponentsAxis = us-gaap_GeneralPartnerMember |  |  |  |  |
OP Units - General Partner distributions |  |  | (554,429)eqr_GeneralPartnerDistribution / us-gaap_PartnerCapitalComponentsAxis = us-gaap_GeneralPartnerMember |  |  |  |  |
Supplemental Executive Retirement Plan (SERP) |  |  | 282 eqr_SupplementalExecutiveRetirementPlanSerp / us-gaap_PartnerCapitalComponentsAxis = us-gaap_GeneralPartnerMember |  |  |  |  |
Acquisition of Noncontrolling Interests - Partially Owned Properties | 13 eqr_AcquisitionNoncontrollingInterestsPartiallyOwnedProperties |  | 1,293 eqr_AcquisitionNoncontrollingInterestsPartiallyOwnedProperties / us-gaap_PartnerCapitalComponentsAxis = us-gaap_GeneralPartnerMember |  |  | (1,306)eqr_AcquisitionNoncontrollingInterestsPartiallyOwnedProperties / us-gaap_PartnerCapitalComponentsAxis = us-gaap_PartiallyOwnedPropertiesMember |  |
Change in market value of Redeemable Limited Partners |  |  | 38,734 eqr_LimitedPartnersRedemptions / us-gaap_PartnerCapitalComponentsAxis = us-gaap_GeneralPartnerMember |  |  |  |  |
Adjustment for Limited Partners ownership in Operating Partnership |  |  | 5,763 eqr_AdjustmentForLimitedPartnersOwnershipInOperatingPartnership / us-gaap_PartnerCapitalComponentsAxis = us-gaap_GeneralPartnerMember | (5,763)eqr_AdjustmentForLimitedPartnersOwnershipInOperatingPartnership / us-gaap_PartnerCapitalComponentsAxis = us-gaap_LimitedPartnerMember |  |  |  |
Limited Partners' Capital Account [Abstract] |  |  |  |  |  |  |  |
Issuance of OP Units to Noncontrolling Interests |  |  |  | 66,606 eqr_IssuanceOfOpUnitsToNoncontrollingInterests / us-gaap_PartnerCapitalComponentsAxis = us-gaap_LimitedPartnerMember |  |  |  |
Issuance restricted units to Limited Partners |  |  |  | 5 eqr_IssuanceOfLongTermIncentivePlanUnitsIntoNoncontrollingInterest / us-gaap_PartnerCapitalComponentsAxis = us-gaap_LimitedPartnerMember |  |  |  |
Equity compensation associated with Units - Limited Partners |  |  |  | 5,307 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationOtherLongtermIncentivePlansRequisiteServicePeriodRecognition / us-gaap_PartnerCapitalComponentsAxis = us-gaap_LimitedPartnerMember |  |  |  |
Net income available to Units - Limited Partners |  |  |  | 38,641 us-gaap_NetIncomeLossAllocatedToLimitedPartners / us-gaap_PartnerCapitalComponentsAxis = us-gaap_LimitedPartnerMember |  |  |  |
Units - Limited Partners distributions |  |  |  | (25,095)eqr_UnitsLimitedPartnersDistributions / us-gaap_PartnerCapitalComponentsAxis = us-gaap_LimitedPartnerMember |  |  |  |
Change in carrying value of Redeemable Limited Partners |  |  |  | (20,702)eqr_ChangeInCarryingValueOfRedeemableLimitedPartners / us-gaap_PartnerCapitalComponentsAxis = us-gaap_LimitedPartnerMember |  |  |  |
Adjustment For Limited Partners Ownership In Operating Partnership |  |  | 5,763 eqr_AdjustmentForLimitedPartnersOwnershipInOperatingPartnership / us-gaap_PartnerCapitalComponentsAxis = us-gaap_GeneralPartnerMember | (5,763)eqr_AdjustmentForLimitedPartnersOwnershipInOperatingPartnership / us-gaap_PartnerCapitalComponentsAxis = us-gaap_LimitedPartnerMember |  |  |  |
Accumulated other comprehensive (loss) income - derivative instruments: |  |  |  |  |  |  |  |
Unrealized holding (losses) gains arising during the year | (11,772)us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax |  |  |  | (11,772)us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax / us-gaap_PartnerCapitalComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |  |  |
Losses reclassified into earnings from other comprehensive income | (14,678)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax |  |  |  | 14,678 us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax / us-gaap_PartnerCapitalComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |  |  |
Accumulated other comprehensive income (loss) - other instruments: |  |  |  |  |  |  |  |
Unrealized holding gains arising during the year | 664 us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax |  |  |  | 664 us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax / us-gaap_PartnerCapitalComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |  |  |
(Gains) on Sale of Securities, Net | 0 us-gaap_GainLossOnSaleOfSecuritiesNet |  |  |  | 0 us-gaap_GainLossOnSaleOfSecuritiesNet / us-gaap_PartnerCapitalComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |  |  |
Currency translation adjustments arising during the year | 0 us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax |  |  |  | 0 us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax / us-gaap_PartnerCapitalComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |  |  |
Noncontrolling Interest [Abstract] |  |  |  |  |  |  |  |
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest | 881,204 us-gaap_ProfitLoss |  |  |  |  | 844 us-gaap_ProfitLoss / us-gaap_PartnerCapitalComponentsAxis = us-gaap_PartiallyOwnedPropertiesMember |  |
Contributions - Noncontrolling Interests | 8,221 us-gaap_ProceedsFromMinorityShareholders |  |  |  |  | 8,221 us-gaap_ProceedsFromMinorityShareholders / us-gaap_PartnerCapitalComponentsAxis = us-gaap_PartiallyOwnedPropertiesMember |  |
Distributions to Noncontrolling Interests |  |  |  |  |  | (5,131)us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders / us-gaap_PartnerCapitalComponentsAxis = us-gaap_PartiallyOwnedPropertiesMember |  |
Archstone of Archstone |  |  |  |  |  | 0 eqr_ArchstoneAcquisitionNoncontrollingInterestsPartiallyOwnedProperties / us-gaap_PartnerCapitalComponentsAxis = us-gaap_PartiallyOwnedPropertiesMember |  |
Acquisition Noncontrolling Interests - Partially Owned Properties | 13 eqr_AcquisitionNoncontrollingInterestsPartiallyOwnedProperties |  | 1,293 eqr_AcquisitionNoncontrollingInterestsPartiallyOwnedProperties / us-gaap_PartnerCapitalComponentsAxis = us-gaap_GeneralPartnerMember |  |  | (1,306)eqr_AcquisitionNoncontrollingInterestsPartiallyOwnedProperties / us-gaap_PartnerCapitalComponentsAxis = us-gaap_PartiallyOwnedPropertiesMember |  |
Other |  |  |  |  |  | 754 us-gaap_StockholdersEquityOther / us-gaap_PartnerCapitalComponentsAxis = us-gaap_PartiallyOwnedPropertiesMember |  |
Balance, end of period at Dec. 31, 2012 |  | 50,000 eqr_PartnersCapitalIncludingPortionAttributableToNoncontrollingInterests / us-gaap_PartnerCapitalComponentsAxis = us-gaap_PreferredStockMember | 7,432,961 eqr_PartnersCapitalIncludingPortionAttributableToNoncontrollingInterests / us-gaap_PartnerCapitalComponentsAxis = us-gaap_GeneralPartnerMember | 159,606 eqr_PartnersCapitalIncludingPortionAttributableToNoncontrollingInterests / us-gaap_PartnerCapitalComponentsAxis = us-gaap_LimitedPartnerMember | (193,148)eqr_PartnersCapitalIncludingPortionAttributableToNoncontrollingInterests / us-gaap_PartnerCapitalComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 77,688 eqr_PartnersCapitalIncludingPortionAttributableToNoncontrollingInterests / us-gaap_PartnerCapitalComponentsAxis = us-gaap_PartiallyOwnedPropertiesMember |  |
Preference Units |  |  |  |  |  |  |  |
Redemption of 6.48% Series N Cumulative Redeemable | 0 us-gaap_PaymentsForRepurchaseOfPreferredStockAndPreferenceStock | 0 us-gaap_PaymentsForRepurchaseOfPreferredStockAndPreferenceStock / us-gaap_PartnerCapitalComponentsAxis = us-gaap_PreferredStockMember |  |  |  |  |  |
Preferred Stock Preference Units Dividend Rate Percentage |  |  |  |  |  |  | 6.48%eqr_PreferredStockPreferenceUnitsDividendRatePercentage / us-gaap_StatementClassOfStockAxis = eqr_SeriesNPreferredStockMember | 0.00%eqr_PreferredStockPreferenceUnitsDividendRatePercentage / us-gaap_PartnerCapitalComponentsAxis = us-gaap_PreferredStockMember / us-gaap_StatementClassOfStockAxis = eqr_SeriesNPreferredStockMember
OP Unit Issuance: |  |  |  |  |  |  |  |
Conversion of OP Units held by Limited Partners into OP Units held by General Partner |  |  | 1,699 eqr_ExchangeOfOPUnitsBetweenLimitedPartnerAndGeneralPartner / us-gaap_PartnerCapitalComponentsAxis = us-gaap_GeneralPartnerMember | (1,699)eqr_ExchangeOfOPUnitsBetweenLimitedPartnerAndGeneralPartner / us-gaap_PartnerCapitalComponentsAxis = us-gaap_LimitedPartnerMember |  |  |  |
Issuance of OP Units |  |  | 1,929,868 eqr_IssuanceOfOpUnits / us-gaap_PartnerCapitalComponentsAxis = us-gaap_GeneralPartnerMember |  |  |  |  |
Exercise of EQR share options |  |  | 17,252 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised / us-gaap_PartnerCapitalComponentsAxis = us-gaap_GeneralPartnerMember |  |  |  |  |
EQR's Employee Share Purchase Plan (ESPP) |  |  | 3,401 us-gaap_StockIssuedDuringPeriodValueEmployeeStockPurchasePlan / us-gaap_PartnerCapitalComponentsAxis = us-gaap_GeneralPartnerMember |  |  |  |  |
Share-based employee compensation expense: |  |  |  |  |  |  |  |
EQR restricted shares |  |  | 13,264 us-gaap_AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationRestrictedStockUnitsRequisiteServicePeriodRecognition / us-gaap_PartnerCapitalComponentsAxis = us-gaap_GeneralPartnerMember |  |  |  |  |
EQR share options |  |  | 10,514 us-gaap_AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationStockOptionsRequisiteServicePeriodRecognition / us-gaap_PartnerCapitalComponentsAxis = us-gaap_GeneralPartnerMember |  |  |  |  |
EQR ESPP discount |  |  | 632 us-gaap_AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationEmployeeStockPurchaseProgramRequisiteServicePeriodRecognition / us-gaap_PartnerCapitalComponentsAxis = us-gaap_GeneralPartnerMember |  |  |  |  |
OP Units repurchased and retired |  |  | 0 eqr_PaymentsForRepurchaseOfOpUnits / us-gaap_PartnerCapitalComponentsAxis = us-gaap_GeneralPartnerMember |  |  |  |  |
Offering costs |  |  | (1,047)us-gaap_AdjustmentsToAdditionalPaidInCapitalStockIssuedIssuanceCosts / us-gaap_PartnerCapitalComponentsAxis = us-gaap_GeneralPartnerMember |  |  |  |  |
Premium on redemption of Preferred Shares - original issuance costs |  |  | 0 eqr_PremiumOnRedemptionOfPreferredSharesPreferenceUnitsOriginalIssuance / us-gaap_PartnerCapitalComponentsAxis = us-gaap_GeneralPartnerMember |  |  |  |  |
Net income available to Units - General Partner |  |  | 1,826,468 us-gaap_NetIncomeLossAllocatedToGeneralPartners / us-gaap_PartnerCapitalComponentsAxis = us-gaap_GeneralPartnerMember |  |  |  |  |
OP Units - General Partner distributions |  |  | (666,565)eqr_GeneralPartnerDistribution / us-gaap_PartnerCapitalComponentsAxis = us-gaap_GeneralPartnerMember |  |  |  |  |
Supplemental Executive Retirement Plan (SERP) |  |  | (422)eqr_SupplementalExecutiveRetirementPlanSerp / us-gaap_PartnerCapitalComponentsAxis = us-gaap_GeneralPartnerMember |  |  |  |  |
Acquisition of Noncontrolling Interests - Partially Owned Properties | 0 eqr_AcquisitionNoncontrollingInterestsPartiallyOwnedProperties |  | 0 eqr_AcquisitionNoncontrollingInterestsPartiallyOwnedProperties / us-gaap_PartnerCapitalComponentsAxis = us-gaap_GeneralPartnerMember |  |  | 0 eqr_AcquisitionNoncontrollingInterestsPartiallyOwnedProperties / us-gaap_PartnerCapitalComponentsAxis = us-gaap_PartiallyOwnedPropertiesMember |  |
Change in market value of Redeemable Limited Partners |  |  | 79,667 eqr_LimitedPartnersRedemptions / us-gaap_PartnerCapitalComponentsAxis = us-gaap_GeneralPartnerMember |  |  |  |  |
Adjustment for Limited Partners ownership in Operating Partnership |  |  | (35,329)eqr_AdjustmentForLimitedPartnersOwnershipInOperatingPartnership / us-gaap_PartnerCapitalComponentsAxis = us-gaap_GeneralPartnerMember | 35,329 eqr_AdjustmentForLimitedPartnersOwnershipInOperatingPartnership / us-gaap_PartnerCapitalComponentsAxis = us-gaap_LimitedPartnerMember |  |  |  |
Limited Partners' Capital Account [Abstract] |  |  |  |  |  |  |  |
Issuance of OP Units to Noncontrolling Interests |  |  |  | 0 eqr_IssuanceOfOpUnitsToNoncontrollingInterests / us-gaap_PartnerCapitalComponentsAxis = us-gaap_LimitedPartnerMember |  |  |  |
Issuance restricted units to Limited Partners |  |  |  | 5 eqr_IssuanceOfLongTermIncentivePlanUnitsIntoNoncontrollingInterest / us-gaap_PartnerCapitalComponentsAxis = us-gaap_LimitedPartnerMember |  |  |  |
Equity compensation associated with Units - Limited Partners |  |  |  | 13,609 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationOtherLongtermIncentivePlansRequisiteServicePeriodRecognition / us-gaap_PartnerCapitalComponentsAxis = us-gaap_LimitedPartnerMember |  |  |  |
Net income available to Units - Limited Partners |  |  |  | 75,278 us-gaap_NetIncomeLossAllocatedToLimitedPartners / us-gaap_PartnerCapitalComponentsAxis = us-gaap_LimitedPartnerMember |  |  |  |
Units - Limited Partners distributions |  |  |  | (26,277)eqr_UnitsLimitedPartnersDistributions / us-gaap_PartnerCapitalComponentsAxis = us-gaap_LimitedPartnerMember |  |  |  |
Change in carrying value of Redeemable Limited Partners |  |  |  | (44,439)eqr_ChangeInCarryingValueOfRedeemableLimitedPartners / us-gaap_PartnerCapitalComponentsAxis = us-gaap_LimitedPartnerMember |  |  |  |
Adjustment For Limited Partners Ownership In Operating Partnership |  |  | (35,329)eqr_AdjustmentForLimitedPartnersOwnershipInOperatingPartnership / us-gaap_PartnerCapitalComponentsAxis = us-gaap_GeneralPartnerMember | 35,329 eqr_AdjustmentForLimitedPartnersOwnershipInOperatingPartnership / us-gaap_PartnerCapitalComponentsAxis = us-gaap_LimitedPartnerMember |  |  |  |
Accumulated other comprehensive (loss) income - derivative instruments: |  |  |  |  |  |  |  |
Unrealized holding (losses) gains arising during the year | 18,771 us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax |  |  |  | 18,771 us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax / us-gaap_PartnerCapitalComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |  |  |
Losses reclassified into earnings from other comprehensive income | (20,141)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax |  |  |  | 20,141 us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax / us-gaap_PartnerCapitalComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |  |  |
Accumulated other comprehensive income (loss) - other instruments: |  |  |  |  |  |  |  |
Unrealized holding gains arising during the year | 583 us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax |  |  |  | 583 us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax / us-gaap_PartnerCapitalComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |  |  |
(Gains) on Sale of Securities, Net | (2,122)us-gaap_GainLossOnSaleOfSecuritiesNet |  |  |  | (2,122)us-gaap_GainLossOnSaleOfSecuritiesNet / us-gaap_PartnerCapitalComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |  |  |
Currency translation adjustments arising during the year | 613 us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax |  |  |  | 613 us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax / us-gaap_PartnerCapitalComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |  |  |
Noncontrolling Interest [Abstract] |  |  |  |  |  |  |  |
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest | 1,905,353 us-gaap_ProfitLoss |  |  |  |  | (538)us-gaap_ProfitLoss / us-gaap_PartnerCapitalComponentsAxis = us-gaap_PartiallyOwnedPropertiesMember |  |
Contributions - Noncontrolling Interests | 27,660 us-gaap_ProceedsFromMinorityShareholders |  |  |  |  | 27,660 us-gaap_ProceedsFromMinorityShareholders / us-gaap_PartnerCapitalComponentsAxis = us-gaap_PartiallyOwnedPropertiesMember |  |
Distributions to Noncontrolling Interests |  |  |  |  |  | (6,490)us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders / us-gaap_PartnerCapitalComponentsAxis = us-gaap_PartiallyOwnedPropertiesMember |  |
Archstone of Archstone |  |  |  |  |  | 28,263 eqr_ArchstoneAcquisitionNoncontrollingInterestsPartiallyOwnedProperties / us-gaap_PartnerCapitalComponentsAxis = us-gaap_PartiallyOwnedPropertiesMember |  |
Acquisition Noncontrolling Interests - Partially Owned Properties | 0 eqr_AcquisitionNoncontrollingInterestsPartiallyOwnedProperties |  | 0 eqr_AcquisitionNoncontrollingInterestsPartiallyOwnedProperties / us-gaap_PartnerCapitalComponentsAxis = us-gaap_GeneralPartnerMember |  |  | 0 eqr_AcquisitionNoncontrollingInterestsPartiallyOwnedProperties / us-gaap_PartnerCapitalComponentsAxis = us-gaap_PartiallyOwnedPropertiesMember |  |
Other |  |  |  |  |  | 0 us-gaap_StockholdersEquityOther / us-gaap_PartnerCapitalComponentsAxis = us-gaap_PartiallyOwnedPropertiesMember |  |
Balance, end of period at Dec. 31, 2013 |  | 50,000 eqr_PartnersCapitalIncludingPortionAttributableToNoncontrollingInterests / us-gaap_PartnerCapitalComponentsAxis = us-gaap_PreferredStockMember | 10,612,363 eqr_PartnersCapitalIncludingPortionAttributableToNoncontrollingInterests / us-gaap_PartnerCapitalComponentsAxis = us-gaap_GeneralPartnerMember | 211,412 eqr_PartnersCapitalIncludingPortionAttributableToNoncontrollingInterests / us-gaap_PartnerCapitalComponentsAxis = us-gaap_LimitedPartnerMember | (155,162)eqr_PartnersCapitalIncludingPortionAttributableToNoncontrollingInterests / us-gaap_PartnerCapitalComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 126,583 eqr_PartnersCapitalIncludingPortionAttributableToNoncontrollingInterests / us-gaap_PartnerCapitalComponentsAxis = us-gaap_PartiallyOwnedPropertiesMember |  |
Preference Units |  |  |  |  |  |  |  |
Redemption of 6.48% Series N Cumulative Redeemable | 0 us-gaap_PaymentsForRepurchaseOfPreferredStockAndPreferenceStock | 0 us-gaap_PaymentsForRepurchaseOfPreferredStockAndPreferenceStock / us-gaap_PartnerCapitalComponentsAxis = us-gaap_PreferredStockMember |  |  |  |  |  |
Preferred Stock Preference Units Dividend Rate Percentage |  |  |  |  |  |  | 6.48%eqr_PreferredStockPreferenceUnitsDividendRatePercentage / us-gaap_StatementClassOfStockAxis = eqr_SeriesNPreferredStockMember | 6.48%eqr_PreferredStockPreferenceUnitsDividendRatePercentage / us-gaap_PartnerCapitalComponentsAxis = us-gaap_PreferredStockMember / us-gaap_StatementClassOfStockAxis = eqr_SeriesNPreferredStockMember
OP Unit Issuance: |  |  |  |  |  |  |  |
Conversion of OP Units held by Limited Partners into OP Units held by General Partner |  |  | 2,365 eqr_ExchangeOfOPUnitsBetweenLimitedPartnerAndGeneralPartner / us-gaap_PartnerCapitalComponentsAxis = us-gaap_GeneralPartnerMember | (2,365)eqr_ExchangeOfOPUnitsBetweenLimitedPartnerAndGeneralPartner / us-gaap_PartnerCapitalComponentsAxis = us-gaap_LimitedPartnerMember |  |  |  |
Issuance of OP Units |  |  | 0 eqr_IssuanceOfOpUnits / us-gaap_PartnerCapitalComponentsAxis = us-gaap_GeneralPartnerMember |  |  |  |  |
Exercise of EQR share options |  |  | 82,573 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised / us-gaap_PartnerCapitalComponentsAxis = us-gaap_GeneralPartnerMember |  |  |  |  |
EQR's Employee Share Purchase Plan (ESPP) |  |  | 3,392 us-gaap_StockIssuedDuringPeriodValueEmployeeStockPurchasePlan / us-gaap_PartnerCapitalComponentsAxis = us-gaap_GeneralPartnerMember |  |  |  |  |
Share-based employee compensation expense: |  |  |  |  |  |  |  |
EQR restricted shares |  |  | 9,904 us-gaap_AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationRestrictedStockUnitsRequisiteServicePeriodRecognition / us-gaap_PartnerCapitalComponentsAxis = us-gaap_GeneralPartnerMember |  |  |  |  |
EQR share options |  |  | 7,349 us-gaap_AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationStockOptionsRequisiteServicePeriodRecognition / us-gaap_PartnerCapitalComponentsAxis = us-gaap_GeneralPartnerMember |  |  |  |  |
EQR ESPP discount |  |  | 859 us-gaap_AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationEmployeeStockPurchaseProgramRequisiteServicePeriodRecognition / us-gaap_PartnerCapitalComponentsAxis = us-gaap_GeneralPartnerMember |  |  |  |  |
OP Units repurchased and retired |  |  | (1,777)eqr_PaymentsForRepurchaseOfOpUnits / us-gaap_PartnerCapitalComponentsAxis = us-gaap_GeneralPartnerMember |  |  |  |  |
Offering costs |  |  | (41)us-gaap_AdjustmentsToAdditionalPaidInCapitalStockIssuedIssuanceCosts / us-gaap_PartnerCapitalComponentsAxis = us-gaap_GeneralPartnerMember |  |  |  |  |
Premium on redemption of Preferred Shares - original issuance costs |  |  | 0 eqr_PremiumOnRedemptionOfPreferredSharesPreferenceUnitsOriginalIssuance / us-gaap_PartnerCapitalComponentsAxis = us-gaap_GeneralPartnerMember |  |  |  |  |
Net income available to Units - General Partner |  |  | 627,163 us-gaap_NetIncomeLossAllocatedToGeneralPartners / us-gaap_PartnerCapitalComponentsAxis = us-gaap_GeneralPartnerMember |  |  |  |  |
OP Units - General Partner distributions |  |  | (723,782)eqr_GeneralPartnerDistribution / us-gaap_PartnerCapitalComponentsAxis = us-gaap_GeneralPartnerMember |  |  |  |  |
Supplemental Executive Retirement Plan (SERP) |  |  | 7,374 eqr_SupplementalExecutiveRetirementPlanSerp / us-gaap_PartnerCapitalComponentsAxis = us-gaap_GeneralPartnerMember |  |  |  |  |
Acquisition of Noncontrolling Interests - Partially Owned Properties | 5,501 eqr_AcquisitionNoncontrollingInterestsPartiallyOwnedProperties |  | (2,308)eqr_AcquisitionNoncontrollingInterestsPartiallyOwnedProperties / us-gaap_PartnerCapitalComponentsAxis = us-gaap_GeneralPartnerMember |  |  | (2,244)eqr_AcquisitionNoncontrollingInterestsPartiallyOwnedProperties / us-gaap_PartnerCapitalComponentsAxis = us-gaap_PartiallyOwnedPropertiesMember |  |
Change in market value of Redeemable Limited Partners |  |  | (139,818)eqr_LimitedPartnersRedemptions / us-gaap_PartnerCapitalComponentsAxis = us-gaap_GeneralPartnerMember |  |  |  |  |
Adjustment for Limited Partners ownership in Operating Partnership |  |  | 4,992 eqr_AdjustmentForLimitedPartnersOwnershipInOperatingPartnership / us-gaap_PartnerCapitalComponentsAxis = us-gaap_GeneralPartnerMember | (4,992)eqr_AdjustmentForLimitedPartnersOwnershipInOperatingPartnership / us-gaap_PartnerCapitalComponentsAxis = us-gaap_LimitedPartnerMember |  |  |  |
Limited Partners' Capital Account [Abstract] |  |  |  |  |  |  |  |
Issuance of OP Units to Noncontrolling Interests |  |  |  | 0 eqr_IssuanceOfOpUnitsToNoncontrollingInterests / us-gaap_PartnerCapitalComponentsAxis = us-gaap_LimitedPartnerMember |  |  |  |
Issuance restricted units to Limited Partners |  |  |  | 3 eqr_IssuanceOfLongTermIncentivePlanUnitsIntoNoncontrollingInterest / us-gaap_PartnerCapitalComponentsAxis = us-gaap_LimitedPartnerMember |  |  |  |
Equity compensation associated with Units - Limited Partners |  |  |  | 11,969 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationOtherLongtermIncentivePlansRequisiteServicePeriodRecognition / us-gaap_PartnerCapitalComponentsAxis = us-gaap_LimitedPartnerMember |  |  |  |
Net income available to Units - Limited Partners |  |  |  | 24,831 us-gaap_NetIncomeLossAllocatedToLimitedPartners / us-gaap_PartnerCapitalComponentsAxis = us-gaap_LimitedPartnerMember |  |  |  |
Units - Limited Partners distributions |  |  |  | (28,676)eqr_UnitsLimitedPartnersDistributions / us-gaap_PartnerCapitalComponentsAxis = us-gaap_LimitedPartnerMember |  |  |  |
Change in carrying value of Redeemable Limited Partners |  |  |  | 2,229 eqr_ChangeInCarryingValueOfRedeemableLimitedPartners / us-gaap_PartnerCapitalComponentsAxis = us-gaap_LimitedPartnerMember |  |  |  |
Adjustment For Limited Partners Ownership In Operating Partnership |  |  | 4,992 eqr_AdjustmentForLimitedPartnersOwnershipInOperatingPartnership / us-gaap_PartnerCapitalComponentsAxis = us-gaap_GeneralPartnerMember | (4,992)eqr_AdjustmentForLimitedPartnersOwnershipInOperatingPartnership / us-gaap_PartnerCapitalComponentsAxis = us-gaap_LimitedPartnerMember |  |  |  |
Accumulated other comprehensive (loss) income - derivative instruments: |  |  |  |  |  |  |  |
Unrealized holding (losses) gains arising during the year | (33,306)us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax |  |  |  | (33,306)us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax / us-gaap_PartnerCapitalComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |  |  |
Losses reclassified into earnings from other comprehensive income | (16,868)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax |  |  |  | 16,868 us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax / us-gaap_PartnerCapitalComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |  |  |
Accumulated other comprehensive income (loss) - other instruments: |  |  |  |  |  |  |  |
Unrealized holding gains arising during the year | 0 us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax |  |  |  | 0 us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax / us-gaap_PartnerCapitalComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |  |  |
(Gains) on Sale of Securities, Net | 0 us-gaap_GainLossOnSaleOfSecuritiesNet |  |  |  | 0 us-gaap_GainLossOnSaleOfSecuritiesNet / us-gaap_PartnerCapitalComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |  |  |
Currency translation adjustments arising during the year | (552)us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax |  |  |  | (552)us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax / us-gaap_PartnerCapitalComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |  |  |
Noncontrolling Interest [Abstract] |  |  |  |  |  |  |  |
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest | 658,683 us-gaap_ProfitLoss |  |  |  |  | 2,544 us-gaap_ProfitLoss / us-gaap_PartnerCapitalComponentsAxis = us-gaap_PartiallyOwnedPropertiesMember |  |
Contributions - Noncontrolling Interests | 5,684 us-gaap_ProceedsFromMinorityShareholders |  |  |  |  | 5,684 us-gaap_ProceedsFromMinorityShareholders / us-gaap_PartnerCapitalComponentsAxis = us-gaap_PartiallyOwnedPropertiesMember |  |
Distributions to Noncontrolling Interests |  |  |  |  |  | (7,827)us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders / us-gaap_PartnerCapitalComponentsAxis = us-gaap_PartiallyOwnedPropertiesMember |  |
Archstone of Archstone |  |  |  |  |  | 0 eqr_ArchstoneAcquisitionNoncontrollingInterestsPartiallyOwnedProperties / us-gaap_PartnerCapitalComponentsAxis = us-gaap_PartiallyOwnedPropertiesMember |  |
Acquisition Noncontrolling Interests - Partially Owned Properties | 5,501 eqr_AcquisitionNoncontrollingInterestsPartiallyOwnedProperties |  | (2,308)eqr_AcquisitionNoncontrollingInterestsPartiallyOwnedProperties / us-gaap_PartnerCapitalComponentsAxis = us-gaap_GeneralPartnerMember |  |  | (2,244)eqr_AcquisitionNoncontrollingInterestsPartiallyOwnedProperties / us-gaap_PartnerCapitalComponentsAxis = us-gaap_PartiallyOwnedPropertiesMember |  |
Other |  |  |  |  |  | 169 us-gaap_StockholdersEquityOther / us-gaap_PartnerCapitalComponentsAxis = us-gaap_PartiallyOwnedPropertiesMember |  |
Balance, end of period at Dec. 31, 2014 |  | $ 50,000 eqr_PartnersCapitalIncludingPortionAttributableToNoncontrollingInterests / us-gaap_PartnerCapitalComponentsAxis = us-gaap_PreferredStockMember | $ 10,490,608 eqr_PartnersCapitalIncludingPortionAttributableToNoncontrollingInterests / us-gaap_PartnerCapitalComponentsAxis = us-gaap_GeneralPartnerMember | $ 214,411 eqr_PartnersCapitalIncludingPortionAttributableToNoncontrollingInterests / us-gaap_PartnerCapitalComponentsAxis = us-gaap_LimitedPartnerMember | $ (172,152)eqr_PartnersCapitalIncludingPortionAttributableToNoncontrollingInterests / us-gaap_PartnerCapitalComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | $ 124,909 eqr_PartnersCapitalIncludingPortionAttributableToNoncontrollingInterests / us-gaap_PartnerCapitalComponentsAxis = us-gaap_PartiallyOwnedPropertiesMember |  |

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