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v2.4.1.9

Summary of Significant Accounting Policies Tax (Details) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Deferred Tax Assets Gross | $ 46,700,000 us-gaap_DeferredTaxAssetsGross |  |
Income and other tax (expense) benefit | 1,394,000 us-gaap_IncomeTaxExpenseBenefit | 1,169,000 us-gaap_IncomeTaxExpenseBenefit | 514,000 us-gaap_IncomeTaxExpenseBenefit
Discontinued Operation, Tax Effect of Discontinued Operation | 8,000 us-gaap_DiscontinuedOperationTaxEffectOfDiscontinuedOperation | 449,000 us-gaap_DiscontinuedOperationTaxEffectOfDiscontinuedOperation | 34,000 us-gaap_DiscontinuedOperationTaxEffectOfDiscontinuedOperation
Provision for income, franchise and excise taxes | 1,402,000 eqr_ProvisionForIncomeFranchiseAndExciseTaxes | 1,618,000 eqr_ProvisionForIncomeFranchiseAndExciseTaxes | 548,000 eqr_ProvisionForIncomeFranchiseAndExciseTaxes
Operating Loss Carryforwards | 35,100,000 us-gaap_OperatingLossCarryforwards |  |
Tax Treatment Of Dividends And Distributions Ordinary Dividends | $ 1.475 eqr_TaxTreatmentOfDividendsAndDistributionsOrdinaryDividends | $ 0.662 eqr_TaxTreatmentOfDividendsAndDistributionsOrdinaryDividends | $ 1.375 eqr_TaxTreatmentOfDividendsAndDistributionsOrdinaryDividends
Tax Treatment Of Dividends And Distributions Qualified Dividends | $ 0.088 eqr_TaxTreatmentOfDividendsAndDistributionsQualifiedDividends | $ 0.050 eqr_TaxTreatmentOfDividendsAndDistributionsQualifiedDividends | $ 0.000 eqr_TaxTreatmentOfDividendsAndDistributionsQualifiedDividends
Tax Treatment Of Dividends And Distributions Long Term Capital Gain | $ 0.280 eqr_TaxTreatmentOfDividendsAndDistributionsLongTermCapitalGain | $ 0.870 eqr_TaxTreatmentOfDividendsAndDistributionsLongTermCapitalGain | $ 0.253 eqr_TaxTreatmentOfDividendsAndDistributionsLongTermCapitalGain
Tax Treatment Of Dividends And Distributions Unrecaptured Section Twelve Hundred And Fifty Gain | $ 0.157 eqr_TaxTreatmentOfDividendsAndDistributionsUnrecapturedSectionTwelveHundredAndFiftyGain | $ 0.268 eqr_TaxTreatmentOfDividendsAndDistributionsUnrecapturedSectionTwelveHundredAndFiftyGain | $ 0.152 eqr_TaxTreatmentOfDividendsAndDistributionsUnrecapturedSectionTwelveHundredAndFiftyGain
Distributions declared per Common Share outstanding | $ 2.000 us-gaap_CommonStockDividendsPerShareDeclared | $ 1.850 us-gaap_CommonStockDividendsPerShareDeclared | $ 1.780 us-gaap_CommonStockDividendsPerShareDeclared
Land And Depreciable Property Net | $ 16,700,000,000 eqr_LandAndDepreciablePropertyNet | $ 15,200,000,000 eqr_LandAndDepreciablePropertyNet |
Minimum [Member] |  |  |
Operating Loss Carryforwards, Expiration Dates | Jan. 01, 2029 |  |
Maximum [Member] |  |  |
Operating Loss Carryforwards, Expiration Dates | Dec. 31, 2032 |  |

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