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Earnings Per Share (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Income (loss) from continuing operations | $ 657,101 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest | $ (168,174)us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest | $ 160,298 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest
Income (Loss) Attributable to Noncontrolling Interest | (24,771)us-gaap_IncomeLossAttributableToNoncontrollingInterest | 6,834 us-gaap_IncomeLossAttributableToNoncontrollingInterest | (6,417)us-gaap_IncomeLossAttributableToNoncontrollingInterest
Net (income) loss attributable to Noncontrolling Interests - Partially Owned Properties | (2,544)eqr_AllocationOfNetIncomeLossToNoncontrollingInterestsPartiallyOwnedProperties | 538 eqr_AllocationOfNetIncomeLossToNoncontrollingInterestsPartiallyOwnedProperties | (844)eqr_AllocationOfNetIncomeLossToNoncontrollingInterestsPartiallyOwnedProperties
Dividends, Preferred Stock | (4,145)us-gaap_DividendsPreferredStock | (4,145)us-gaap_DividendsPreferredStock | (10,355)us-gaap_DividendsPreferredStock
Premium on redemption of Preferred Shares | 0 us-gaap_RedemptionPremium | 0 us-gaap_RedemptionPremium | (5,152)us-gaap_RedemptionPremium
Income (Loss) from Continuing Operations Attributable to Parent | 625,641 us-gaap_IncomeLossFromContinuingOperations | (164,947)us-gaap_IncomeLossFromContinuingOperations | 137,530 us-gaap_IncomeLossFromContinuingOperations
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent | 1,522 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity | 1,991,415 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity | 688,682 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity
Net Income (Loss) Available to Common Stockholders, Basic | 627,163 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | 1,826,468 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | 826,212 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Income From Continuing Operations Available To Common Shares | 650,412 eqr_IncomeFromContinuingOperationsAvailableToCommonShares |  | 143,947 eqr_IncomeFromContinuingOperationsAvailableToCommonShares
Discontinued operations, net | 1,582 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | 2,073,527 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | 720,906 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax
Net Income (Loss) Available to Common Stockholders, Diluted | 651,994 us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted | 1,826,468 us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted | 864,853 us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted
Weighted average Common Shares outstanding | 361,181 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 354,305 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 302,701 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Dilutive Op Units | 13,718 eqr_DilutiveOpUnits |  | 13,853 eqr_DilutiveOpUnits
Dilutive Securities Options | 2,836 eqr_DilutiveSecuritiesOptions |  | 3,212 eqr_DilutiveSecuritiesOptions
Weighted Average Number of Shares Outstanding, Diluted | 377,735 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 354,305 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 319,766 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Net Income per share - basic | $ 1.736 us-gaap_EarningsPerShareBasic | $ 5.155 us-gaap_EarningsPerShareBasic | $ 2.729 us-gaap_EarningsPerShareBasic
Net income per share - diluted | $ 1.726 us-gaap_EarningsPerShareDiluted | $ 5.155 us-gaap_EarningsPerShareDiluted | $ 2.705 us-gaap_EarningsPerShareDiluted
Income (loss) from continuing operations available to Common Shares | $ 1.732 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ (0.466)us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 0.454 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare
Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Basic Share | $ 0.004 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare | $ 5.621 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare | $ 2.275 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare
Income (Loss) from Continuing Operations, Per Diluted Share | $ 1.722 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ (0.466)us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 0.450 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare
Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Diluted Share | $ 0.004 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare | $ 5.621 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare | $ 2.255 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare
OPERATING PARTNERSHIP |  |  |
Income (loss) from continuing operations | 657,101 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_PartnershipInterestMember | (168,174)us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_PartnershipInterestMember | 160,298 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_PartnershipInterestMember
Net (income) loss attributable to Noncontrolling Interests - Partially Owned Properties | (2,544)eqr_AllocationOfNetIncomeLossToNoncontrollingInterestsPartiallyOwnedProperties / dei_LegalEntityAxis = us-gaap_PartnershipInterestMember | 538 eqr_AllocationOfNetIncomeLossToNoncontrollingInterestsPartiallyOwnedProperties / dei_LegalEntityAxis = us-gaap_PartnershipInterestMember | (844)eqr_AllocationOfNetIncomeLossToNoncontrollingInterestsPartiallyOwnedProperties / dei_LegalEntityAxis = us-gaap_PartnershipInterestMember
Premium on redemption of Preferred Shares | 0 us-gaap_RedemptionPremium / dei_LegalEntityAxis = us-gaap_PartnershipInterestMember | 0 us-gaap_RedemptionPremium / dei_LegalEntityAxis = us-gaap_PartnershipInterestMember | (5,152)us-gaap_RedemptionPremium / dei_LegalEntityAxis = us-gaap_PartnershipInterestMember
Discontinued operations, net | 1,582 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax / dei_LegalEntityAxis = us-gaap_PartnershipInterestMember | 2,073,527 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax / dei_LegalEntityAxis = us-gaap_PartnershipInterestMember | 720,906 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax / dei_LegalEntityAxis = us-gaap_PartnershipInterestMember
Dilutive Securities Options | 2,836 eqr_DilutiveSecuritiesOptions / dei_LegalEntityAxis = us-gaap_PartnershipInterestMember |  | 3,212 eqr_DilutiveSecuritiesOptions / dei_LegalEntityAxis = us-gaap_PartnershipInterestMember
Net Income per share - basic | $ 1.736 us-gaap_EarningsPerShareBasic / dei_LegalEntityAxis = us-gaap_PartnershipInterestMember | $ 5.155 us-gaap_EarningsPerShareBasic / dei_LegalEntityAxis = us-gaap_PartnershipInterestMember | $ 2.729 us-gaap_EarningsPerShareBasic / dei_LegalEntityAxis = us-gaap_PartnershipInterestMember
Net income per share - diluted | $ 1.726 us-gaap_EarningsPerShareDiluted / dei_LegalEntityAxis = us-gaap_PartnershipInterestMember | $ 5.155 us-gaap_EarningsPerShareDiluted / dei_LegalEntityAxis = us-gaap_PartnershipInterestMember | $ 2.705 us-gaap_EarningsPerShareDiluted / dei_LegalEntityAxis = us-gaap_PartnershipInterestMember
Income (loss) from continuing operations available to Common Shares | $ 1.732 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare / dei_LegalEntityAxis = us-gaap_PartnershipInterestMember | $ (0.466)us-gaap_IncomeLossFromContinuingOperationsPerBasicShare / dei_LegalEntityAxis = us-gaap_PartnershipInterestMember | $ 0.454 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare / dei_LegalEntityAxis = us-gaap_PartnershipInterestMember
Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Basic Share | $ 0.004 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare / dei_LegalEntityAxis = us-gaap_PartnershipInterestMember | $ 5.621 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare / dei_LegalEntityAxis = us-gaap_PartnershipInterestMember | $ 2.275 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare / dei_LegalEntityAxis = us-gaap_PartnershipInterestMember
Income (Loss) from Continuing Operations, Per Diluted Share | $ 1.722 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare / dei_LegalEntityAxis = us-gaap_PartnershipInterestMember | $ (0.466)us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare / dei_LegalEntityAxis = us-gaap_PartnershipInterestMember | $ 0.450 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare / dei_LegalEntityAxis = us-gaap_PartnershipInterestMember
Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Diluted Share | $ 0.004 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare / dei_LegalEntityAxis = us-gaap_PartnershipInterestMember | $ 5.621 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare / dei_LegalEntityAxis = us-gaap_PartnershipInterestMember | $ 2.255 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare / dei_LegalEntityAxis = us-gaap_PartnershipInterestMember
Dividend preference units | (4,145)eqr_DividendPreferenceUnits / dei_LegalEntityAxis = us-gaap_PartnershipInterestMember | (4,145)eqr_DividendPreferenceUnits / dei_LegalEntityAxis = us-gaap_PartnershipInterestMember | (10,355)eqr_DividendPreferenceUnits / dei_LegalEntityAxis = us-gaap_PartnershipInterestMember
Income Loss From Continuing Operations Available To Units | 650,412 eqr_IncomeLossFromContinuingOperationsAvailableToUnits / dei_LegalEntityAxis = us-gaap_PartnershipInterestMember | (171,781)eqr_IncomeLossFromContinuingOperationsAvailableToUnits / dei_LegalEntityAxis = us-gaap_PartnershipInterestMember | 143,947 eqr_IncomeLossFromContinuingOperationsAvailableToUnits / dei_LegalEntityAxis = us-gaap_PartnershipInterestMember
Net Income loss available to Op unitholders basic diluted numerator | $ 651,994 eqr_NetIncomeLossAvailableToOpUnitholdersBasicDilutedNumerator / dei_LegalEntityAxis = us-gaap_PartnershipInterestMember | $ 1,901,746 eqr_NetIncomeLossAvailableToOpUnitholdersBasicDilutedNumerator / dei_LegalEntityAxis = us-gaap_PartnershipInterestMember | $ 864,853 eqr_NetIncomeLossAvailableToOpUnitholdersBasicDilutedNumerator / dei_LegalEntityAxis = us-gaap_PartnershipInterestMember
Weighted Average Limited Partnership and General Partnership Units Outstanding, Basic | 374,899 us-gaap_WeightedAverageLimitedPartnershipAndGeneralPartnershipUnitsOutstandingBasic / dei_LegalEntityAxis = us-gaap_PartnershipInterestMember | 368,038 us-gaap_WeightedAverageLimitedPartnershipAndGeneralPartnershipUnitsOutstandingBasic / dei_LegalEntityAxis = us-gaap_PartnershipInterestMember | 316,554 us-gaap_WeightedAverageLimitedPartnershipAndGeneralPartnershipUnitsOutstandingBasic / dei_LegalEntityAxis = us-gaap_PartnershipInterestMember
Weighted Average Number Of Limited Partnership And General Partnership Unit Outstanding Diluted | 377,735 eqr_WeightedAverageNumberOfLimitedPartnershipAndGeneralPartnershipUnitOutstandingDiluted / dei_LegalEntityAxis = us-gaap_PartnershipInterestMember | 368,038 eqr_WeightedAverageNumberOfLimitedPartnershipAndGeneralPartnershipUnitOutstandingDiluted / dei_LegalEntityAxis = us-gaap_PartnershipInterestMember | 319,766 eqr_WeightedAverageNumberOfLimitedPartnershipAndGeneralPartnershipUnitOutstandingDiluted / dei_LegalEntityAxis = us-gaap_PartnershipInterestMember

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