XML 69 R60.htm IDEA: XBRL DOCUMENT
v2.4.1.9

Reportable Segments (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended |
--- | --- | ---
Mar. 31, 2015 | Mar. 31, 2014 | Dec. 31, 2014
Reportable Segments |  |  |
Assets | $ 23,029,048 us-gaap_Assets |  | $ 22,950,614 us-gaap_Assets
Payments to Acquire Other Property, Plant, and Equipment | 38,170 us-gaap_PaymentsToAcquireOtherPropertyPlantAndEquipment |  |
Rental income: |  |  |
Total Rental Income | 664,606 eqr_SegmentReportingInformationRevenues | 630,725 eqr_SegmentReportingInformationRevenues |
Operating expenses: |  |  |
Total Operating Expenses | 232,436 eqr_SegmentReportingSegmentOperatingExpenses | 229,778 eqr_SegmentReportingSegmentOperatingExpenses |
NOI: |  |  |
Total NOI | 432,170 eqr_SegmentReportingInformationNetOperatingIncome | 400,947 eqr_SegmentReportingInformationNetOperatingIncome |
Reportable Segments (Textuals) [Abstract] |  |  |
Units in same store properties | 97,586 eqr_NumberOfUnitsInSameStoreProperties |  |
Rental income | 664,606 us-gaap_OperatingLeasesIncomeStatementLeaseRevenue | 630,725 us-gaap_OperatingLeasesIncomeStatementLeaseRevenue |
Property and maintenance expense | (124,560)us-gaap_CostOfPropertyRepairsAndMaintenance | (125,566)us-gaap_CostOfPropertyRepairsAndMaintenance |
Real estate taxes and insurance expense | (86,432)us-gaap_RealEstateTaxesAndInsurance | (82,094)us-gaap_RealEstateTaxesAndInsurance |
Property management expense | (21,444)us-gaap_OwnedPropertyManagementCosts | (22,118)us-gaap_OwnedPropertyManagementCosts |
Total Operating Expenses | (232,436)eqr_TotalOperatingExpenses | (229,778)eqr_TotalOperatingExpenses |
Non-same store [Domain] |  |  |
Reportable Segments |  |  |
Assets | 3,609,209 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = eqr_NonsamestoreDomain |  |
Payments to Acquire Other Property, Plant, and Equipment | 2,862 us-gaap_PaymentsToAcquireOtherPropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = eqr_NonsamestoreDomain |  |
Same Store [Domain] |  |  |
Rental income: |  |  |
Same store - Rental Income | 632,034 eqr_SegmentReportingSegmentSameStoreRentalIncome / us-gaap_StatementScenarioAxis = eqr_SameStoreDomain | 601,794 eqr_SegmentReportingSegmentSameStoreRentalIncome / us-gaap_StatementScenarioAxis = eqr_SameStoreDomain |
Operating expenses: |  |  |
Same store - Operating Expenses | 216,544 eqr_SegmentReportingSegmentSameStoreOperatingExpenses / us-gaap_StatementScenarioAxis = eqr_SameStoreDomain | 213,460 eqr_SegmentReportingSegmentSameStoreOperatingExpenses / us-gaap_StatementScenarioAxis = eqr_SameStoreDomain |
NOI: |  |  |
Same store - NOI | 415,490 eqr_SegmentReportingInformationSameStoreNetOperatingIncome / us-gaap_StatementScenarioAxis = eqr_SameStoreDomain | 388,334 eqr_SegmentReportingInformationSameStoreNetOperatingIncome / us-gaap_StatementScenarioAxis = eqr_SameStoreDomain |
Same Store [Domain] | Boston [Domain] |  |  |
Reportable Segments |  |  |
Assets | 1,908,859 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = eqr_BostonDomain / us-gaap_StatementScenarioAxis = eqr_SameStoreDomain |  |
Payments to Acquire Other Property, Plant, and Equipment | 3,505 us-gaap_PaymentsToAcquireOtherPropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = eqr_BostonDomain / us-gaap_StatementScenarioAxis = eqr_SameStoreDomain |  |
Rental income: |  |  |
Same store - Rental Income | 64,033 eqr_SegmentReportingSegmentSameStoreRentalIncome / us-gaap_StatementBusinessSegmentsAxis = eqr_BostonDomain / us-gaap_StatementScenarioAxis = eqr_SameStoreDomain | 61,907 eqr_SegmentReportingSegmentSameStoreRentalIncome / us-gaap_StatementBusinessSegmentsAxis = eqr_BostonDomain / us-gaap_StatementScenarioAxis = eqr_SameStoreDomain |
Operating expenses: |  |  |
Same store - Operating Expenses | 22,541 eqr_SegmentReportingSegmentSameStoreOperatingExpenses / us-gaap_StatementBusinessSegmentsAxis = eqr_BostonDomain / us-gaap_StatementScenarioAxis = eqr_SameStoreDomain | 22,129 eqr_SegmentReportingSegmentSameStoreOperatingExpenses / us-gaap_StatementBusinessSegmentsAxis = eqr_BostonDomain / us-gaap_StatementScenarioAxis = eqr_SameStoreDomain |
NOI: |  |  |
Same store - NOI | 41,492 eqr_SegmentReportingInformationSameStoreNetOperatingIncome / us-gaap_StatementBusinessSegmentsAxis = eqr_BostonDomain / us-gaap_StatementScenarioAxis = eqr_SameStoreDomain | 39,778 eqr_SegmentReportingInformationSameStoreNetOperatingIncome / us-gaap_StatementBusinessSegmentsAxis = eqr_BostonDomain / us-gaap_StatementScenarioAxis = eqr_SameStoreDomain |
Same Store [Domain] | Denver [Domain] |  |  |
Reportable Segments |  |  |
Assets | 514,958 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = eqr_DenverDomain / us-gaap_StatementScenarioAxis = eqr_SameStoreDomain |  |
Payments to Acquire Other Property, Plant, and Equipment | 1,120 us-gaap_PaymentsToAcquireOtherPropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = eqr_DenverDomain / us-gaap_StatementScenarioAxis = eqr_SameStoreDomain |  |
Rental income: |  |  |
Same store - Rental Income | 28,997 eqr_SegmentReportingSegmentSameStoreRentalIncome / us-gaap_StatementBusinessSegmentsAxis = eqr_DenverDomain / us-gaap_StatementScenarioAxis = eqr_SameStoreDomain | 26,612 eqr_SegmentReportingSegmentSameStoreRentalIncome / us-gaap_StatementBusinessSegmentsAxis = eqr_DenverDomain / us-gaap_StatementScenarioAxis = eqr_SameStoreDomain |
Operating expenses: |  |  |
Same store - Operating Expenses | 7,460 eqr_SegmentReportingSegmentSameStoreOperatingExpenses / us-gaap_StatementBusinessSegmentsAxis = eqr_DenverDomain / us-gaap_StatementScenarioAxis = eqr_SameStoreDomain | 7,461 eqr_SegmentReportingSegmentSameStoreOperatingExpenses / us-gaap_StatementBusinessSegmentsAxis = eqr_DenverDomain / us-gaap_StatementScenarioAxis = eqr_SameStoreDomain |
NOI: |  |  |
Same store - NOI | 21,537 eqr_SegmentReportingInformationSameStoreNetOperatingIncome / us-gaap_StatementBusinessSegmentsAxis = eqr_DenverDomain / us-gaap_StatementScenarioAxis = eqr_SameStoreDomain | 19,151 eqr_SegmentReportingInformationSameStoreNetOperatingIncome / us-gaap_StatementBusinessSegmentsAxis = eqr_DenverDomain / us-gaap_StatementScenarioAxis = eqr_SameStoreDomain |
Same Store [Domain] | New York [Domain] |  |  |
Reportable Segments |  |  |
Assets | 4,637,217 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = eqr_NewYorkDomain / us-gaap_StatementScenarioAxis = eqr_SameStoreDomain |  |
Payments to Acquire Other Property, Plant, and Equipment | 3,797 us-gaap_PaymentsToAcquireOtherPropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = eqr_NewYorkDomain / us-gaap_StatementScenarioAxis = eqr_SameStoreDomain |  |
Rental income: |  |  |
Same store - Rental Income | 116,070 eqr_SegmentReportingSegmentSameStoreRentalIncome / us-gaap_StatementBusinessSegmentsAxis = eqr_NewYorkDomain / us-gaap_StatementScenarioAxis = eqr_SameStoreDomain | 111,186 eqr_SegmentReportingSegmentSameStoreRentalIncome / us-gaap_StatementBusinessSegmentsAxis = eqr_NewYorkDomain / us-gaap_StatementScenarioAxis = eqr_SameStoreDomain |
Operating expenses: |  |  |
Same store - Operating Expenses | 46,113 eqr_SegmentReportingSegmentSameStoreOperatingExpenses / us-gaap_StatementBusinessSegmentsAxis = eqr_NewYorkDomain / us-gaap_StatementScenarioAxis = eqr_SameStoreDomain | 45,834 eqr_SegmentReportingSegmentSameStoreOperatingExpenses / us-gaap_StatementBusinessSegmentsAxis = eqr_NewYorkDomain / us-gaap_StatementScenarioAxis = eqr_SameStoreDomain |
NOI: |  |  |
Same store - NOI | 69,957 eqr_SegmentReportingInformationSameStoreNetOperatingIncome / us-gaap_StatementBusinessSegmentsAxis = eqr_NewYorkDomain / us-gaap_StatementScenarioAxis = eqr_SameStoreDomain | 65,352 eqr_SegmentReportingInformationSameStoreNetOperatingIncome / us-gaap_StatementBusinessSegmentsAxis = eqr_NewYorkDomain / us-gaap_StatementScenarioAxis = eqr_SameStoreDomain |
Same Store [Domain] | San Francisco [Domain] |  |  |
Reportable Segments |  |  |
Assets | 2,700,366 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = eqr_SanFranciscoDomain / us-gaap_StatementScenarioAxis = eqr_SameStoreDomain |  |
Payments to Acquire Other Property, Plant, and Equipment | 5,638 us-gaap_PaymentsToAcquireOtherPropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = eqr_SanFranciscoDomain / us-gaap_StatementScenarioAxis = eqr_SameStoreDomain |  |
Rental income: |  |  |
Same store - Rental Income | 89,850 eqr_SegmentReportingSegmentSameStoreRentalIncome / us-gaap_StatementBusinessSegmentsAxis = eqr_SanFranciscoDomain / us-gaap_StatementScenarioAxis = eqr_SameStoreDomain | 81,261 eqr_SegmentReportingSegmentSameStoreRentalIncome / us-gaap_StatementBusinessSegmentsAxis = eqr_SanFranciscoDomain / us-gaap_StatementScenarioAxis = eqr_SameStoreDomain |
Operating expenses: |  |  |
Same store - Operating Expenses | 27,103 eqr_SegmentReportingSegmentSameStoreOperatingExpenses / us-gaap_StatementBusinessSegmentsAxis = eqr_SanFranciscoDomain / us-gaap_StatementScenarioAxis = eqr_SameStoreDomain | 26,609 eqr_SegmentReportingSegmentSameStoreOperatingExpenses / us-gaap_StatementBusinessSegmentsAxis = eqr_SanFranciscoDomain / us-gaap_StatementScenarioAxis = eqr_SameStoreDomain |
NOI: |  |  |
Same store - NOI | 62,747 eqr_SegmentReportingInformationSameStoreNetOperatingIncome / us-gaap_StatementBusinessSegmentsAxis = eqr_SanFranciscoDomain / us-gaap_StatementScenarioAxis = eqr_SameStoreDomain | 54,652 eqr_SegmentReportingInformationSameStoreNetOperatingIncome / us-gaap_StatementBusinessSegmentsAxis = eqr_SanFranciscoDomain / us-gaap_StatementScenarioAxis = eqr_SameStoreDomain |
Same Store [Domain] | Seattle [Domain] |  |  |
Reportable Segments |  |  |
Assets | 1,088,728 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = eqr_SeattleDomain / us-gaap_StatementScenarioAxis = eqr_SameStoreDomain |  |
Payments to Acquire Other Property, Plant, and Equipment | 3,524 us-gaap_PaymentsToAcquireOtherPropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = eqr_SeattleDomain / us-gaap_StatementScenarioAxis = eqr_SameStoreDomain |  |
Rental income: |  |  |
Same store - Rental Income | 40,390 eqr_SegmentReportingSegmentSameStoreRentalIncome / us-gaap_StatementBusinessSegmentsAxis = eqr_SeattleDomain / us-gaap_StatementScenarioAxis = eqr_SameStoreDomain | 37,621 eqr_SegmentReportingSegmentSameStoreRentalIncome / us-gaap_StatementBusinessSegmentsAxis = eqr_SeattleDomain / us-gaap_StatementScenarioAxis = eqr_SameStoreDomain |
Operating expenses: |  |  |
Same store - Operating Expenses | 12,667 eqr_SegmentReportingSegmentSameStoreOperatingExpenses / us-gaap_StatementBusinessSegmentsAxis = eqr_SeattleDomain / us-gaap_StatementScenarioAxis = eqr_SameStoreDomain | 12,734 eqr_SegmentReportingSegmentSameStoreOperatingExpenses / us-gaap_StatementBusinessSegmentsAxis = eqr_SeattleDomain / us-gaap_StatementScenarioAxis = eqr_SameStoreDomain |
NOI: |  |  |
Same store - NOI | 27,723 eqr_SegmentReportingInformationSameStoreNetOperatingIncome / us-gaap_StatementBusinessSegmentsAxis = eqr_SeattleDomain / us-gaap_StatementScenarioAxis = eqr_SameStoreDomain | 24,887 eqr_SegmentReportingInformationSameStoreNetOperatingIncome / us-gaap_StatementBusinessSegmentsAxis = eqr_SeattleDomain / us-gaap_StatementScenarioAxis = eqr_SameStoreDomain |
Same Store [Domain] | South Florida [Domain] |  |  |
Reportable Segments |  |  |
Assets | 1,126,085 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = eqr_SouthFloridaDomain / us-gaap_StatementScenarioAxis = eqr_SameStoreDomain |  |
Payments to Acquire Other Property, Plant, and Equipment | 2,942 us-gaap_PaymentsToAcquireOtherPropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = eqr_SouthFloridaDomain / us-gaap_StatementScenarioAxis = eqr_SameStoreDomain |  |
Rental income: |  |  |
Same store - Rental Income | 49,302 eqr_SegmentReportingSegmentSameStoreRentalIncome / us-gaap_StatementBusinessSegmentsAxis = eqr_SouthFloridaDomain / us-gaap_StatementScenarioAxis = eqr_SameStoreDomain | 46,896 eqr_SegmentReportingSegmentSameStoreRentalIncome / us-gaap_StatementBusinessSegmentsAxis = eqr_SouthFloridaDomain / us-gaap_StatementScenarioAxis = eqr_SameStoreDomain |
Operating expenses: |  |  |
Same store - Operating Expenses | 17,968 eqr_SegmentReportingSegmentSameStoreOperatingExpenses / us-gaap_StatementBusinessSegmentsAxis = eqr_SouthFloridaDomain / us-gaap_StatementScenarioAxis = eqr_SameStoreDomain | 17,525 eqr_SegmentReportingSegmentSameStoreOperatingExpenses / us-gaap_StatementBusinessSegmentsAxis = eqr_SouthFloridaDomain / us-gaap_StatementScenarioAxis = eqr_SameStoreDomain |
NOI: |  |  |
Same store - NOI | 31,334 eqr_SegmentReportingInformationSameStoreNetOperatingIncome / us-gaap_StatementBusinessSegmentsAxis = eqr_SouthFloridaDomain / us-gaap_StatementScenarioAxis = eqr_SameStoreDomain | 29,371 eqr_SegmentReportingInformationSameStoreNetOperatingIncome / us-gaap_StatementBusinessSegmentsAxis = eqr_SouthFloridaDomain / us-gaap_StatementScenarioAxis = eqr_SameStoreDomain |
Same Store [Domain] | Southern California [Domain] |  |  |
Reportable Segments |  |  |
Assets | 2,787,871 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = eqr_SouthernCaliforniaDomain / us-gaap_StatementScenarioAxis = eqr_SameStoreDomain |  |
Payments to Acquire Other Property, Plant, and Equipment | 6,020 us-gaap_PaymentsToAcquireOtherPropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = eqr_SouthernCaliforniaDomain / us-gaap_StatementScenarioAxis = eqr_SameStoreDomain |  |
Rental income: |  |  |
Same store - Rental Income | 105,193 eqr_SegmentReportingSegmentSameStoreRentalIncome / us-gaap_StatementBusinessSegmentsAxis = eqr_SouthernCaliforniaDomain / us-gaap_StatementScenarioAxis = eqr_SameStoreDomain | 99,776 eqr_SegmentReportingSegmentSameStoreRentalIncome / us-gaap_StatementBusinessSegmentsAxis = eqr_SouthernCaliforniaDomain / us-gaap_StatementScenarioAxis = eqr_SameStoreDomain |
Operating expenses: |  |  |
Same store - Operating Expenses | 34,126 eqr_SegmentReportingSegmentSameStoreOperatingExpenses / us-gaap_StatementBusinessSegmentsAxis = eqr_SouthernCaliforniaDomain / us-gaap_StatementScenarioAxis = eqr_SameStoreDomain | 33,545 eqr_SegmentReportingSegmentSameStoreOperatingExpenses / us-gaap_StatementBusinessSegmentsAxis = eqr_SouthernCaliforniaDomain / us-gaap_StatementScenarioAxis = eqr_SameStoreDomain |
NOI: |  |  |
Same store - NOI | 71,067 eqr_SegmentReportingInformationSameStoreNetOperatingIncome / us-gaap_StatementBusinessSegmentsAxis = eqr_SouthernCaliforniaDomain / us-gaap_StatementScenarioAxis = eqr_SameStoreDomain | 66,231 eqr_SegmentReportingInformationSameStoreNetOperatingIncome / us-gaap_StatementBusinessSegmentsAxis = eqr_SouthernCaliforniaDomain / us-gaap_StatementScenarioAxis = eqr_SameStoreDomain |
Same Store [Domain] | Washington DC [Domain] |  |  |
Reportable Segments |  |  |
Assets | 4,250,738 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = eqr_WashingtonDCDomain / us-gaap_StatementScenarioAxis = eqr_SameStoreDomain |  |
Payments to Acquire Other Property, Plant, and Equipment | 7,113 us-gaap_PaymentsToAcquireOtherPropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = eqr_WashingtonDCDomain / us-gaap_StatementScenarioAxis = eqr_SameStoreDomain |  |
Rental income: |  |  |
Same store - Rental Income | 112,627 eqr_SegmentReportingSegmentSameStoreRentalIncome / us-gaap_StatementBusinessSegmentsAxis = eqr_WashingtonDCDomain / us-gaap_StatementScenarioAxis = eqr_SameStoreDomain | 111,804 eqr_SegmentReportingSegmentSameStoreRentalIncome / us-gaap_StatementBusinessSegmentsAxis = eqr_WashingtonDCDomain / us-gaap_StatementScenarioAxis = eqr_SameStoreDomain |
Operating expenses: |  |  |
Same store - Operating Expenses | 38,539 eqr_SegmentReportingSegmentSameStoreOperatingExpenses / us-gaap_StatementBusinessSegmentsAxis = eqr_WashingtonDCDomain / us-gaap_StatementScenarioAxis = eqr_SameStoreDomain | 37,809 eqr_SegmentReportingSegmentSameStoreOperatingExpenses / us-gaap_StatementBusinessSegmentsAxis = eqr_WashingtonDCDomain / us-gaap_StatementScenarioAxis = eqr_SameStoreDomain |
NOI: |  |  |
Same store - NOI | 74,088 eqr_SegmentReportingInformationSameStoreNetOperatingIncome / us-gaap_StatementBusinessSegmentsAxis = eqr_WashingtonDCDomain / us-gaap_StatementScenarioAxis = eqr_SameStoreDomain | 73,995 eqr_SegmentReportingInformationSameStoreNetOperatingIncome / us-gaap_StatementBusinessSegmentsAxis = eqr_WashingtonDCDomain / us-gaap_StatementScenarioAxis = eqr_SameStoreDomain |
Same Store [Domain] | Non-Core [Domain] |  |  |
Reportable Segments |  |  |
Assets | 405,017 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = eqr_NonCoreDomain / us-gaap_StatementScenarioAxis = eqr_SameStoreDomain |  |
Payments to Acquire Other Property, Plant, and Equipment | 1,649 us-gaap_PaymentsToAcquireOtherPropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = eqr_NonCoreDomain / us-gaap_StatementScenarioAxis = eqr_SameStoreDomain |  |
Rental income: |  |  |
Same store - Rental Income | 25,572 eqr_SegmentReportingSegmentSameStoreRentalIncome / us-gaap_StatementBusinessSegmentsAxis = eqr_NonCoreDomain / us-gaap_StatementScenarioAxis = eqr_SameStoreDomain | 24,731 eqr_SegmentReportingSegmentSameStoreRentalIncome / us-gaap_StatementBusinessSegmentsAxis = eqr_NonCoreDomain / us-gaap_StatementScenarioAxis = eqr_SameStoreDomain |
Operating expenses: |  |  |
Same store - Operating Expenses | 10,027 eqr_SegmentReportingSegmentSameStoreOperatingExpenses / us-gaap_StatementBusinessSegmentsAxis = eqr_NonCoreDomain / us-gaap_StatementScenarioAxis = eqr_SameStoreDomain | 9,814 eqr_SegmentReportingSegmentSameStoreOperatingExpenses / us-gaap_StatementBusinessSegmentsAxis = eqr_NonCoreDomain / us-gaap_StatementScenarioAxis = eqr_SameStoreDomain |
NOI: |  |  |
Same store - NOI | 15,545 eqr_SegmentReportingInformationSameStoreNetOperatingIncome / us-gaap_StatementBusinessSegmentsAxis = eqr_NonCoreDomain / us-gaap_StatementScenarioAxis = eqr_SameStoreDomain | 14,917 eqr_SegmentReportingInformationSameStoreNetOperatingIncome / us-gaap_StatementBusinessSegmentsAxis = eqr_NonCoreDomain / us-gaap_StatementScenarioAxis = eqr_SameStoreDomain |
Same Store [Domain] | Same Store [Domain] |  |  |
Reportable Segments |  |  |
Assets | 19,419,839 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = eqr_SameStoreDomain / us-gaap_StatementScenarioAxis = eqr_SameStoreDomain |  |
Payments to Acquire Other Property, Plant, and Equipment | 35,308 us-gaap_PaymentsToAcquireOtherPropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = eqr_SameStoreDomain / us-gaap_StatementScenarioAxis = eqr_SameStoreDomain |  |
Non-same store [Domain] | Boston [Domain] |  |  |
Reportable Segments |  |  |
Assets | 47,996 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = eqr_BostonDomain / us-gaap_StatementScenarioAxis = eqr_NonsamestoreDomain |  |
Payments to Acquire Other Property, Plant, and Equipment | 34 us-gaap_PaymentsToAcquireOtherPropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = eqr_BostonDomain / us-gaap_StatementScenarioAxis = eqr_NonsamestoreDomain |  |
Rental income: |  |  |
Non-same store - Rental Income | 922 eqr_SegmentReportingSegmentNonSameStoreRentalIncome / us-gaap_StatementBusinessSegmentsAxis = eqr_BostonDomain / us-gaap_StatementScenarioAxis = eqr_NonsamestoreDomain | 1,028 eqr_SegmentReportingSegmentNonSameStoreRentalIncome / us-gaap_StatementBusinessSegmentsAxis = eqr_BostonDomain / us-gaap_StatementScenarioAxis = eqr_NonsamestoreDomain |
Operating expenses: |  |  |
Non-same store - Operating Expenses | 229 eqr_SegmentReportingSegmentNonSameStoreOperatingExpenses / us-gaap_StatementBusinessSegmentsAxis = eqr_BostonDomain / us-gaap_StatementScenarioAxis = eqr_NonsamestoreDomain | 210 eqr_SegmentReportingSegmentNonSameStoreOperatingExpenses / us-gaap_StatementBusinessSegmentsAxis = eqr_BostonDomain / us-gaap_StatementScenarioAxis = eqr_NonsamestoreDomain |
NOI: |  |  |
Non-same store - NOI | 693 eqr_SegmentReportingInformationNonSameStoreNetOperatingIncome / us-gaap_StatementBusinessSegmentsAxis = eqr_BostonDomain / us-gaap_StatementScenarioAxis = eqr_NonsamestoreDomain | 818 eqr_SegmentReportingInformationNonSameStoreNetOperatingIncome / us-gaap_StatementBusinessSegmentsAxis = eqr_BostonDomain / us-gaap_StatementScenarioAxis = eqr_NonsamestoreDomain |
Non-same store [Domain] | Seattle [Domain] |  |  |
Reportable Segments |  |  |
Assets | 231,258 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = eqr_SeattleDomain / us-gaap_StatementScenarioAxis = eqr_NonsamestoreDomain |  |
Payments to Acquire Other Property, Plant, and Equipment | 466 us-gaap_PaymentsToAcquireOtherPropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = eqr_SeattleDomain / us-gaap_StatementScenarioAxis = eqr_NonsamestoreDomain |  |
Rental income: |  |  |
Non-same store - Rental Income | 4,579 eqr_SegmentReportingSegmentNonSameStoreRentalIncome / us-gaap_StatementBusinessSegmentsAxis = eqr_SeattleDomain / us-gaap_StatementScenarioAxis = eqr_NonsamestoreDomain | 107 eqr_SegmentReportingSegmentNonSameStoreRentalIncome / us-gaap_StatementBusinessSegmentsAxis = eqr_SeattleDomain / us-gaap_StatementScenarioAxis = eqr_NonsamestoreDomain |
Operating expenses: |  |  |
Non-same store - Operating Expenses | 1,298 eqr_SegmentReportingSegmentNonSameStoreOperatingExpenses / us-gaap_StatementBusinessSegmentsAxis = eqr_SeattleDomain / us-gaap_StatementScenarioAxis = eqr_NonsamestoreDomain | 146 eqr_SegmentReportingSegmentNonSameStoreOperatingExpenses / us-gaap_StatementBusinessSegmentsAxis = eqr_SeattleDomain / us-gaap_StatementScenarioAxis = eqr_NonsamestoreDomain |
NOI: |  |  |
Non-same store - NOI | 3,281 eqr_SegmentReportingInformationNonSameStoreNetOperatingIncome / us-gaap_StatementBusinessSegmentsAxis = eqr_SeattleDomain / us-gaap_StatementScenarioAxis = eqr_NonsamestoreDomain | (39)eqr_SegmentReportingInformationNonSameStoreNetOperatingIncome / us-gaap_StatementBusinessSegmentsAxis = eqr_SeattleDomain / us-gaap_StatementScenarioAxis = eqr_NonsamestoreDomain |
Non-same store [Domain] | South Florida [Domain] |  |  |
Reportable Segments |  |  |
Assets | 66,906 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = eqr_SouthFloridaDomain / us-gaap_StatementScenarioAxis = eqr_NonsamestoreDomain |  |
Payments to Acquire Other Property, Plant, and Equipment | 14 us-gaap_PaymentsToAcquireOtherPropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = eqr_SouthFloridaDomain / us-gaap_StatementScenarioAxis = eqr_NonsamestoreDomain |  |
Rental income: |  |  |
Non-same store - Rental Income | 1,932 eqr_SegmentReportingSegmentNonSameStoreRentalIncome / us-gaap_StatementBusinessSegmentsAxis = eqr_SouthFloridaDomain / us-gaap_StatementScenarioAxis = eqr_NonsamestoreDomain | 803 eqr_SegmentReportingSegmentNonSameStoreRentalIncome / us-gaap_StatementBusinessSegmentsAxis = eqr_SouthFloridaDomain / us-gaap_StatementScenarioAxis = eqr_NonsamestoreDomain |
Operating expenses: |  |  |
Non-same store - Operating Expenses | 675 eqr_SegmentReportingSegmentNonSameStoreOperatingExpenses / us-gaap_StatementBusinessSegmentsAxis = eqr_SouthFloridaDomain / us-gaap_StatementScenarioAxis = eqr_NonsamestoreDomain | 454 eqr_SegmentReportingSegmentNonSameStoreOperatingExpenses / us-gaap_StatementBusinessSegmentsAxis = eqr_SouthFloridaDomain / us-gaap_StatementScenarioAxis = eqr_NonsamestoreDomain |
NOI: |  |  |
Non-same store - NOI | 1,257 eqr_SegmentReportingInformationNonSameStoreNetOperatingIncome / us-gaap_StatementBusinessSegmentsAxis = eqr_SouthFloridaDomain / us-gaap_StatementScenarioAxis = eqr_NonsamestoreDomain | 349 eqr_SegmentReportingInformationNonSameStoreNetOperatingIncome / us-gaap_StatementBusinessSegmentsAxis = eqr_SouthFloridaDomain / us-gaap_StatementScenarioAxis = eqr_NonsamestoreDomain |
Non-same store [Domain] | Southern California [Domain] |  |  |
Reportable Segments |  |  |
Assets | 845,902 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = eqr_SouthernCaliforniaDomain / us-gaap_StatementScenarioAxis = eqr_NonsamestoreDomain |  |
Payments to Acquire Other Property, Plant, and Equipment | 1,163 us-gaap_PaymentsToAcquireOtherPropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = eqr_SouthernCaliforniaDomain / us-gaap_StatementScenarioAxis = eqr_NonsamestoreDomain |  |
Rental income: |  |  |
Non-same store - Rental Income | 17,777 eqr_SegmentReportingSegmentNonSameStoreRentalIncome / us-gaap_StatementBusinessSegmentsAxis = eqr_SouthernCaliforniaDomain / us-gaap_StatementScenarioAxis = eqr_NonsamestoreDomain | 8,905 eqr_SegmentReportingSegmentNonSameStoreRentalIncome / us-gaap_StatementBusinessSegmentsAxis = eqr_SouthernCaliforniaDomain / us-gaap_StatementScenarioAxis = eqr_NonsamestoreDomain |
Operating expenses: |  |  |
Non-same store - Operating Expenses | 6,528 eqr_SegmentReportingSegmentNonSameStoreOperatingExpenses / us-gaap_StatementBusinessSegmentsAxis = eqr_SouthernCaliforniaDomain / us-gaap_StatementScenarioAxis = eqr_NonsamestoreDomain | 3,690 eqr_SegmentReportingSegmentNonSameStoreOperatingExpenses / us-gaap_StatementBusinessSegmentsAxis = eqr_SouthernCaliforniaDomain / us-gaap_StatementScenarioAxis = eqr_NonsamestoreDomain |
NOI: |  |  |
Non-same store - NOI | 11,249 eqr_SegmentReportingInformationNonSameStoreNetOperatingIncome / us-gaap_StatementBusinessSegmentsAxis = eqr_SouthernCaliforniaDomain / us-gaap_StatementScenarioAxis = eqr_NonsamestoreDomain | 5,215 eqr_SegmentReportingInformationNonSameStoreNetOperatingIncome / us-gaap_StatementBusinessSegmentsAxis = eqr_SouthernCaliforniaDomain / us-gaap_StatementScenarioAxis = eqr_NonsamestoreDomain |
Non-same store [Domain] | Washington DC [Domain] |  |  |
Reportable Segments |  |  |
Assets | 242,360 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = eqr_WashingtonDCDomain / us-gaap_StatementScenarioAxis = eqr_NonsamestoreDomain |  |
Payments to Acquire Other Property, Plant, and Equipment | 1,143 us-gaap_PaymentsToAcquireOtherPropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = eqr_WashingtonDCDomain / us-gaap_StatementScenarioAxis = eqr_NonsamestoreDomain |  |
Rental income: |  |  |
Non-same store - Rental Income | 5,408 eqr_SegmentReportingSegmentNonSameStoreRentalIncome / us-gaap_StatementBusinessSegmentsAxis = eqr_WashingtonDCDomain / us-gaap_StatementScenarioAxis = eqr_NonsamestoreDomain | 3,507 eqr_SegmentReportingSegmentNonSameStoreRentalIncome / us-gaap_StatementBusinessSegmentsAxis = eqr_WashingtonDCDomain / us-gaap_StatementScenarioAxis = eqr_NonsamestoreDomain |
Operating expenses: |  |  |
Non-same store - Operating Expenses | 1,653 eqr_SegmentReportingSegmentNonSameStoreOperatingExpenses / us-gaap_StatementBusinessSegmentsAxis = eqr_WashingtonDCDomain / us-gaap_StatementScenarioAxis = eqr_NonsamestoreDomain | 1,441 eqr_SegmentReportingSegmentNonSameStoreOperatingExpenses / us-gaap_StatementBusinessSegmentsAxis = eqr_WashingtonDCDomain / us-gaap_StatementScenarioAxis = eqr_NonsamestoreDomain |
NOI: |  |  |
Non-same store - NOI | 3,755 eqr_SegmentReportingInformationNonSameStoreNetOperatingIncome / us-gaap_StatementBusinessSegmentsAxis = eqr_WashingtonDCDomain / us-gaap_StatementScenarioAxis = eqr_NonsamestoreDomain | 2,066 eqr_SegmentReportingInformationNonSameStoreNetOperatingIncome / us-gaap_StatementBusinessSegmentsAxis = eqr_WashingtonDCDomain / us-gaap_StatementScenarioAxis = eqr_NonsamestoreDomain |
Non-same store [Domain] | Other (3) [Domain] |  |  |
Reportable Segments |  |  |
Assets | 2,174,787 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = eqr_OtherDomain / us-gaap_StatementScenarioAxis = eqr_NonsamestoreDomain |  |
Payments to Acquire Other Property, Plant, and Equipment | 42 us-gaap_PaymentsToAcquireOtherPropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = eqr_OtherDomain / us-gaap_StatementScenarioAxis = eqr_NonsamestoreDomain |  |
Rental income: |  |  |
Non-same store - Rental Income | 1,954 eqr_SegmentReportingSegmentNonSameStoreRentalIncome / us-gaap_StatementBusinessSegmentsAxis = eqr_OtherDomain / us-gaap_StatementScenarioAxis = eqr_NonsamestoreDomain | 14,581 eqr_SegmentReportingSegmentNonSameStoreRentalIncome / us-gaap_StatementBusinessSegmentsAxis = eqr_OtherDomain / us-gaap_StatementScenarioAxis = eqr_NonsamestoreDomain |
Operating expenses: |  |  |
Non-same store - Operating Expenses | 5,509 eqr_SegmentReportingSegmentNonSameStoreOperatingExpenses / us-gaap_StatementBusinessSegmentsAxis = eqr_OtherDomain / us-gaap_StatementScenarioAxis = eqr_NonsamestoreDomain | 10,377 eqr_SegmentReportingSegmentNonSameStoreOperatingExpenses / us-gaap_StatementBusinessSegmentsAxis = eqr_OtherDomain / us-gaap_StatementScenarioAxis = eqr_NonsamestoreDomain |
NOI: |  |  |
Non-same store - NOI | (3,555)eqr_SegmentReportingInformationNonSameStoreNetOperatingIncome / us-gaap_StatementBusinessSegmentsAxis = eqr_OtherDomain / us-gaap_StatementScenarioAxis = eqr_NonsamestoreDomain | 4,204 eqr_SegmentReportingInformationNonSameStoreNetOperatingIncome / us-gaap_StatementBusinessSegmentsAxis = eqr_OtherDomain / us-gaap_StatementScenarioAxis = eqr_NonsamestoreDomain |
Non-same store [Domain] | Non-same store [Domain] |  |  |
Rental income: |  |  |
Non-same store - Rental Income | 32,572 eqr_SegmentReportingSegmentNonSameStoreRentalIncome / us-gaap_StatementBusinessSegmentsAxis = eqr_NonsamestoreDomain / us-gaap_StatementScenarioAxis = eqr_NonsamestoreDomain | 28,931 eqr_SegmentReportingSegmentNonSameStoreRentalIncome / us-gaap_StatementBusinessSegmentsAxis = eqr_NonsamestoreDomain / us-gaap_StatementScenarioAxis = eqr_NonsamestoreDomain |
Operating expenses: |  |  |
Non-same store - Operating Expenses | 15,892 eqr_SegmentReportingSegmentNonSameStoreOperatingExpenses / us-gaap_StatementBusinessSegmentsAxis = eqr_NonsamestoreDomain / us-gaap_StatementScenarioAxis = eqr_NonsamestoreDomain | 16,318 eqr_SegmentReportingSegmentNonSameStoreOperatingExpenses / us-gaap_StatementBusinessSegmentsAxis = eqr_NonsamestoreDomain / us-gaap_StatementScenarioAxis = eqr_NonsamestoreDomain |
NOI: |  |  |
Non-same store - NOI | $ 16,680 eqr_SegmentReportingInformationNonSameStoreNetOperatingIncome / us-gaap_StatementBusinessSegmentsAxis = eqr_NonsamestoreDomain / us-gaap_StatementScenarioAxis = eqr_NonsamestoreDomain | $ 12,613 eqr_SegmentReportingInformationNonSameStoreNetOperatingIncome / us-gaap_StatementBusinessSegmentsAxis = eqr_NonsamestoreDomain / us-gaap_StatementScenarioAxis = eqr_NonsamestoreDomain |

X
- Definition Total number of units associated with properties acquired or completed and stabilized two or more fiscal years ago, less properties subsequently sold. + References No definition available. + Details
Name: | eqr_NumberOfUnitsInSameStoreProperties
Namespace Prefix: | eqr_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | eqr_RentalIncomeAbstract
Namespace Prefix: | eqr_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | eqr_ReportableSegmentsTextualsAbstract
Namespace Prefix: | eqr_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Rental income less total operating expenses including property and maintenance expense, real estate taxes and insurance expense and property management expense for reportable segments. + References No definition available. + Details
Name: | eqr_SegmentReportingInformationNetOperatingIncome
Namespace Prefix: | eqr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | eqr_SegmentReportingInformationNetOperatingIncomeAbstract
Namespace Prefix: | eqr_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Rental income less total operating expenses including property and maintenance expense, real estate taxes and insurance expense and property management expense for properties acquired during the last two fiscal years, plus any properties in lease-up and not stabilized within the last two fiscal years. + References No definition available. + Details
Name: | eqr_SegmentReportingInformationNonSameStoreNetOperatingIncome
Namespace Prefix: | eqr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of total revenue for the reportable segments, including revenue from external customers, transactions with other operating segments of the same entity, and (gross) interest revenue. All considered to be "operating revenue" for purposes of the taxonomy. + References No definition available. + Details
Name: | eqr_SegmentReportingInformationRevenues
Namespace Prefix: | eqr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Rental income less total operating expenses including property and maintenance expense, real estate taxes and insurance expense and property management expense for properties acquired or completed and stabilized two or more fiscal years ago, less properties subsequently sold. + References No definition available. + Details
Name: | eqr_SegmentReportingInformationSameStoreNetOperatingIncome
Namespace Prefix: | eqr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Property and maintenance expense, real estate taxes and insurance expense and property management expense for properties acquired during the last two fiscal years, plus any properties in lease-up and not stabilized within the last two fiscal years. + References No definition available. + Details
Name: | eqr_SegmentReportingSegmentNonSameStoreOperatingExpenses
Namespace Prefix: | eqr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The total amount of revenue recognized for the period from operating leases, including minimum lease revenue, contingent revenue, percentage revenue and sublease revenue for properties acquired during the past two fiscal years, plus any properties in lease-up and not stabilized within the last two fiscal years. + References No definition available. + Details
Name: | eqr_SegmentReportingSegmentNonSameStoreRentalIncome
Namespace Prefix: | eqr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Total property and maintenance expense, real estate taxes and insurance expense and property management expense for reportable segments. + References No definition available. + Details
Name: | eqr_SegmentReportingSegmentOperatingExpenses
Namespace Prefix: | eqr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | eqr_SegmentReportingSegmentOperatingExpensesAbstract
Namespace Prefix: | eqr_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Property and maintenance expense, real estate taxes and insurance expense and property management expense for properties acquired or completed and stabilized two or more fiscal years ago, less properties subsequently sold. + References No definition available. + Details
Name: | eqr_SegmentReportingSegmentSameStoreOperatingExpenses
Namespace Prefix: | eqr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The total amount of revenue recognized for the period from operating leases, including minimum lease revenue, contingent revenue, percentage revenue and sublease revenue for properties acquired two or more fiscal years ago, less properties subsequently sold. + References No definition available. + Details
Name: | eqr_SegmentReportingSegmentSameStoreRentalIncome
Namespace Prefix: | eqr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Total property and maintenance expense, real estate taxes and insurance expense and property management expense. + References No definition available. + Details
Name: | eqr_TotalOperatingExpenses
Namespace Prefix: | eqr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.18) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 12 -Article 7 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 18 -Article 5 + Details
Name: | us-gaap_Assets
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The aggregate costs of keeping the property in good condition but that do not appreciably prolong the life or increase the value of the property. + 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 210.5-03.2) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
Name: | us-gaap_CostOfPropertyRepairsAndMaintenance
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The total amount of revenue recognized for the period from operating leases, including minimum lease revenue, contingent revenue, percentage revenue and sublease revenue. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=7501430&loc=d3e39896-112707 + Details
Name: | us-gaap_OperatingLeasesIncomeStatementLeaseRevenue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The aggregate costs related to management of owned properties 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 210.5-03.2(d)) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
Name: | us-gaap_OwnedPropertyManagementCosts
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The cash outflow for acquisition of or capital improvements of property, plant and equipment, used to produce goods or deliver services, and not otherwise defined in the taxonomy. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585 + Details
Name: | us-gaap_PaymentsToAcquireOtherPropertyPlantAndEquipment
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The aggregate total of real estate taxes and insurance expense. + 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 210.5-03.6) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 720 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6419918&loc=d3e35301-107843 + Details
Name: | us-gaap_RealEstateTaxesAndInsurance
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | us-gaap_SegmentReportingMeasurementDisclosuresAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=eqr_NonsamestoreDomain
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementScenarioAxis=eqr_NonsamestoreDomain
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementScenarioAxis=eqr_SameStoreDomain
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |