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Real Estate Real Estate (Details 2) (USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Equity Method Investment, Ownership Percentage | 20.00%us-gaap_EquityMethodInvestmentOwnershipPercentage |  |
Properties acquired |  |  | 1 eqr_PropertiesAcquired
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets | $ 498,640,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets | $ 108,000,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets |
Adjusted purchase price of partner's interest in joint venture | 64,200,000 eqr_Adjustedpurchasepriceofpartnersinterestinjointventure |  |
Payments to Acquire Interest in Subsidiaries and Affiliates | 44,800,000 us-gaap_PaymentsToAcquireInterestInSubsidiariesAndAffiliates |  |
Revaluation Loss | 3,500,000 eqr_RevaluationLoss |  |
Disposed Properties | 11 eqr_DisposedProperties | 94 eqr_DisposedProperties |
Disposed Units | 3,480 eqr_DisposedUnits | 29,180 eqr_DisposedUnits |
Proceeds From Sale Of Property | 592,070,000 eqr_ProceedsFromSaleOfProperty | 4,616,073,000 eqr_ProceedsFromSaleOfProperty |
Net gain on sales of real estate properties | 212,685,000 us-gaap_RealEstateRevenueNet | 0 us-gaap_RealEstateRevenueNet | 0 us-gaap_RealEstateRevenueNet
Net gain on sales of land parcels | 5,277,000 eqr_GainLossOnSaleOfLandParcels | 12,227,000 eqr_GainLossOnSaleOfLandParcels | 0 eqr_GainLossOnSaleOfLandParcels
Disposal Group, Including Discontinued Operation, Property, Plant and Equipment |  | 2,000,000,000 us-gaap_DisposalGroupIncludingDiscontinuedOperationPropertyPlantAndEquipment |
Consolidated Rental Properties [Member] |  |  |
Properties acquired | 6 eqr_PropertiesAcquired / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = eqr_ConsolidatedRentalPropertiesMember | 1 eqr_PropertiesAcquired / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = eqr_ConsolidatedRentalPropertiesMember |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets | 469,850,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = eqr_ConsolidatedRentalPropertiesMember | 91,500,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = eqr_ConsolidatedRentalPropertiesMember |
Disposed Properties | 10 eqr_DisposedProperties / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = eqr_ConsolidatedRentalPropertiesMember | 94 eqr_DisposedProperties / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = eqr_ConsolidatedRentalPropertiesMember |
Disposed Units | 3,092 eqr_DisposedUnits / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = eqr_ConsolidatedRentalPropertiesMember | 29,180 eqr_DisposedUnits / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = eqr_ConsolidatedRentalPropertiesMember |
Proceeds From Sale Of Property | 466,968,000 eqr_ProceedsFromSaleOfProperty / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = eqr_ConsolidatedRentalPropertiesMember | 4,459,339,000 eqr_ProceedsFromSaleOfProperty / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = eqr_ConsolidatedRentalPropertiesMember |
Land [Member] |  |  |
Land parcels acquired | 2 eqr_LandParcelsAcquired / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = us-gaap_LandMember | 1 eqr_LandParcelsAcquired / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = us-gaap_LandMember |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets | 28,790,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = us-gaap_LandMember | 16,500,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = us-gaap_LandMember |
Disposed Land Parcels | 3 eqr_DisposedLandParcels / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = us-gaap_LandMember | 7 eqr_DisposedLandParcels / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = us-gaap_LandMember |
Proceeds From Sale Of Property | 62,602,000 eqr_ProceedsFromSaleOfProperty / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = us-gaap_LandMember | 99,650,000 eqr_ProceedsFromSaleOfProperty / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = us-gaap_LandMember |
Unconsolidated Land Parcel Disposition | 0 eqr_UnconsolidatedLandParcelDisposition / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = us-gaap_LandMember | 1 eqr_UnconsolidatedLandParcelDisposition / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = us-gaap_LandMember |
Commercial Real Estate [Member] |  |  |
Proceeds From Sale Of Property |  | 30,734,000 eqr_ProceedsFromSaleOfProperty / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = us-gaap_CommercialRealEstateMember |
Commercial Properties Disposed | 0 eqr_CommercialPropertiesDisposed / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = us-gaap_CommercialRealEstateMember | 1 eqr_CommercialPropertiesDisposed / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = us-gaap_CommercialRealEstateMember |
Unconsolidated Properties [Member] |  |  |
Disposed Properties | 1 eqr_DisposedProperties / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = us-gaap_UnconsolidatedPropertiesMember |  |
Disposed Units | 388 eqr_DisposedUnits / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = us-gaap_UnconsolidatedPropertiesMember |  |
Proceeds From Sale Of Property | 62,500,000 eqr_ProceedsFromSaleOfProperty / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = us-gaap_UnconsolidatedPropertiesMember | 26,350,000 eqr_ProceedsFromSaleOfProperty / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = us-gaap_UnconsolidatedPropertiesMember |
anticipated stabilized real estate value at completion [Member] |  |  |
Real Estate Investments, Other | 87,500,000 us-gaap_RealEstateInvestmentsOther / us-gaap_StatementScenarioAxis = eqr_AnticipatedstabilizedrealestatevalueatcompletionMember |  |
Unconsolidated Properties [Member] |  |  |
Disposed Properties | 1 eqr_DisposedProperties / us-gaap_StatementScenarioAxis = us-gaap_UnconsolidatedPropertiesMember |  |
San Norterra [Domain] |  |  |
Equity Method Investment, Ownership Percentage | 85.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_StatementScenarioAxis = eqr_SanNorterraDomain |  |
Unconsolidated Properties [Member] |  |  |
Net gain on sales of real estate properties | 4,899,000 us-gaap_RealEstateRevenueNet / us-gaap_StatementEquityComponentsAxis = us-gaap_UnconsolidatedPropertiesMember |  |
Series P [Domain] |  |  |
Business Combination, Step Acquisition, Equity Interest in Acquiree, Including Subsequent Acquisition, Percentage | 95.00%us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireeIncludingSubsequentAcquisitionPercentage / us-gaap_StatementClassOfStockAxis = eqr_SeriesPDomain |  |
Liquidation Value Preferred Interests | $ 18,400,000 eqr_LiquidationValuePreferredInterests / us-gaap_StatementClassOfStockAxis = eqr_SeriesPDomain |  |

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- Definition Total number of commercial property or properties that the company disposed of to unaffiliated third parties during the period. + References No definition available. + Details
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- Definition The total number of rental properties that the Company disposed of to unaffiliated parties during the period. + References No definition available. + Details
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- Definition The difference between the book value and the sale price of land parcels sold within the period. + References No definition available. + Details
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- Definition The aggregate liquidation preference of preferred interests acquired in conjunction with the Archstone transaction. + References No definition available. + Details
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- Definition The cash inflow from the sale of real estate investment property. + References No definition available. + Details
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- Definition Amount classified as property, plant and equipment attributable to disposal group held for sale or disposed of. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 45 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=6892542&loc=d3e1107-107759 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1436-107760 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1361-107760 + Details
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- Definition The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6382943&loc=d3e33918-111571 + Details
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- Definition The cash outflow associated with the acquisition of or advances to an entity that is related to it but not strictly controlled (for example, an unconsolidated subsidiary, affiliate, and joint venture or equity method investment) or the acquisition of an additional interest in a subsidiary (controlled entity). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585 + Details
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- Definition Amount of real estate owned for income production and capital accretion potential, not otherwise specified in the existing taxonomy. Such real estate excludes that which is occupied or used in the business, for entertainment purposes, or held in inventory for specific purposes. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.1(d)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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- Definition The aggregate revenue from real estate operations during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1(e)) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 + Details
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