XML 21 R48.htm IDEA: XBRL DOCUMENT
v2.4.1.9

Investments in Partially Owned Entities (Details) (USD $) | 3 Months Ended | 25 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Mar. 31, 2015 | Mar. 31, 2014 | Mar. 31, 2015 | Apr. 30, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Investments In Partially Owned Entities (Textuals) [Abstract] |  |  |  |  |  |
Joint Venture Partner Ownership Percentage | 80.00%eqr_JointVenturePartnerOwnershipPercentage |  | 80.00%eqr_JointVenturePartnerOwnershipPercentage |  |  |
Investments in unconsolidated entities | $ 89,284,000 us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures |  | $ 89,284,000 us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures |  | $ 105,434,000 us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures |
Equity Method Investment, Ownership Percentage | 20.00%us-gaap_EquityMethodInvestmentOwnershipPercentage |  | 20.00%us-gaap_EquityMethodInvestmentOwnershipPercentage |  |  |
Secured Debt | 4,957,876,000 us-gaap_SecuredDebt |  | 4,957,876,000 us-gaap_SecuredDebt |  | 5,086,515,000 us-gaap_SecuredDebt |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  | 6.584%us-gaap_DebtInstrumentInterestRateStatedPercentage |  |
Debt Instrument, Maturity Date | May 01, 2061 |  |  |  |  |
Number of Joint Ventures | 2 eqr_NumberOfJointVentures |  | 2 eqr_NumberOfJointVentures |  |  |
Partners Payments To Acquire Equity Method Investments | 40,100,000 eqr_PartnersPaymentsToAcquireEquityMethodInvestments |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets | 5,968,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets |  | 5,968,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets | 130,300,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets |  |
Investment in Joint Venture | 339,400,000 eqr_InvestmentInJointVenture |  | 339,400,000 eqr_InvestmentInJointVenture |  |  |
Noncontrolling Interests - Partially Owned Properties/Partners' equity | 122,661,000 eqr_NoncontrollingInterestsPartiallyOwnedProperties |  | 122,661,000 eqr_NoncontrollingInterestsPartiallyOwnedProperties |  | 124,909,000 eqr_NoncontrollingInterestsPartiallyOwnedProperties |
Distributions from unconsolidated entities - return of capital | 18,969,000 eqr_ProceedsFromDistributionsReceivedFromUnconsolidatedSubsidiaries | 7,680,000 eqr_ProceedsFromDistributionsReceivedFromUnconsolidatedSubsidiaries |  |  |  |
Partially Owned Property Balance Sheet Schedule |  |  |  |  |  |
Number of Real Estate Properties | 389 us-gaap_NumberOfRealEstateProperties |  | 389 us-gaap_NumberOfRealEstateProperties |  |  |
Number of Units in Real Estate Property | 108,793 us-gaap_NumberOfUnitsInRealEstateProperty |  | 108,793 us-gaap_NumberOfUnitsInRealEstateProperty |  |  |
ASSETS |  |  |  |  |  |
Investment in real estate | 27,795,858,000 us-gaap_RealEstateInvestmentPropertyAtCost |  | 27,795,858,000 us-gaap_RealEstateInvestmentPropertyAtCost |  | 27,675,383,000 us-gaap_RealEstateInvestmentPropertyAtCost |
Real Estate Investment Property, Accumulated Depreciation | (5,600,485,000)us-gaap_RealEstateInvestmentPropertyAccumulatedDepreciation |  | (5,600,485,000)us-gaap_RealEstateInvestmentPropertyAccumulatedDepreciation |  | (5,432,805,000)us-gaap_RealEstateInvestmentPropertyAccumulatedDepreciation |
Investment in real estate, net | 22,195,373,000 us-gaap_RealEstateInvestmentPropertyNet |  | 22,195,373,000 us-gaap_RealEstateInvestmentPropertyNet |  | 22,242,578,000 us-gaap_RealEstateInvestmentPropertyNet |
Cash and cash equivalents | 49,418,000 us-gaap_CashAndCashEquivalentsAtCarryingValue | 37,209,000 us-gaap_CashAndCashEquivalentsAtCarryingValue | 49,418,000 us-gaap_CashAndCashEquivalentsAtCarryingValue |  | 40,080,000 us-gaap_CashAndCashEquivalentsAtCarryingValue | 53,534,000 us-gaap_CashAndCashEquivalentsAtCarryingValue
Investments in unconsolidated entities | 89,284,000 us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures |  | 89,284,000 us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures |  | 105,434,000 us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures |
Deposits - restricted | 203,800,000 us-gaap_RestrictedCashAndCashEquivalents |  | 203,800,000 us-gaap_RestrictedCashAndCashEquivalents |  | 72,303,000 us-gaap_RestrictedCashAndCashEquivalents |
Deferred financing costs, net | 55,791,000 us-gaap_DeferredFinanceCostsNet |  | 55,791,000 us-gaap_DeferredFinanceCostsNet |  | 58,380,000 us-gaap_DeferredFinanceCostsNet |
Other Assets | 384,723,000 us-gaap_OtherAssets |  | 384,723,000 us-gaap_OtherAssets |  | 383,754,000 us-gaap_OtherAssets |
Total assets | 23,029,048,000 us-gaap_Assets |  | 23,029,048,000 us-gaap_Assets |  | 22,950,614,000 us-gaap_Assets |
LIABILITIES AND EQUITY |  |  |  |  |  |
Secured Debt | 4,957,876,000 us-gaap_SecuredDebt |  | 4,957,876,000 us-gaap_SecuredDebt |  | 5,086,515,000 us-gaap_SecuredDebt |
Accounts Payable And Accrued Liabilities Current And Noncurrent Other Than Interest And Dividend Payable | 202,110,000 eqr_AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrentOtherThanInterestAndDividendPayable |  | 202,110,000 eqr_AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrentOtherThanInterestAndDividendPayable |  | 153,590,000 eqr_AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrentOtherThanInterestAndDividendPayable |
Accrued interest payable | 84,670,000 us-gaap_InterestPayableCurrentAndNoncurrent |  | 84,670,000 us-gaap_InterestPayableCurrentAndNoncurrent |  | 89,540,000 us-gaap_InterestPayableCurrentAndNoncurrent |
Other liabilities | 383,057,000 us-gaap_OtherLiabilities |  | 383,057,000 us-gaap_OtherLiabilities |  | 389,915,000 us-gaap_OtherLiabilities |
Security deposits | 75,294,000 us-gaap_SecurityDepositLiability |  | 75,294,000 us-gaap_SecurityDepositLiability |  | 75,633,000 us-gaap_SecurityDepositLiability |
Total liabilities | 11,813,593,000 us-gaap_Liabilities |  | 11,813,593,000 us-gaap_Liabilities |  | 11,742,105,000 us-gaap_Liabilities |
Noncontrolling Interests - Partially Owned Properties/Partners' equity | 122,661,000 eqr_NoncontrollingInterestsPartiallyOwnedProperties |  | 122,661,000 eqr_NoncontrollingInterestsPartiallyOwnedProperties |  | 124,909,000 eqr_NoncontrollingInterestsPartiallyOwnedProperties |
Total liabilities and equity | 23,029,048,000 us-gaap_LiabilitiesAndStockholdersEquity |  | 23,029,048,000 us-gaap_LiabilitiesAndStockholdersEquity |  | 22,950,614,000 us-gaap_LiabilitiesAndStockholdersEquity |
Partially Owned Property Income Statement Schedule |  |  |  |  |  |
Operating revenue | 666,371,000 us-gaap_Revenues | 633,442,000 us-gaap_Revenues |  |  |  |
Depreciation | 194,521,000 us-gaap_Depreciation | 185,167,000 us-gaap_Depreciation |  |  |  |
General and administrative/other | 19,922,000 us-gaap_GeneralAndAdministrativeExpense | 17,576,000 us-gaap_GeneralAndAdministrativeExpense |  |  |  |
Operating Income | 218,171,000 us-gaap_OperatingIncomeLoss | 199,259,000 us-gaap_OperatingIncomeLoss |  |  |  |
Interest and other income | 120,000 us-gaap_InterestAndOtherIncome | 605,000 us-gaap_InterestAndOtherIncome |  |  |  |
Interest: |  |  |  |  |  |
Expense incurred, net | 108,622,000 us-gaap_InterestExpenseDebt | 113,049,000 us-gaap_InterestExpenseDebt |  |  |  |
Amortization of deferred financing costs | (2,589,000)us-gaap_AmortizationOfFinancingCosts | (2,792,000)us-gaap_AmortizationOfFinancingCosts |  |  |  |
Income before income and other taxes, income (loss) from investments in unconsolidated entities, net gain (loss) on sales of real estate properties and land parcels and discontinued operations | 107,150,000 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 83,359,000 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments |  |  |  |
Income and other tax (expense) benefit | (43,000)us-gaap_IncomeTaxExpenseBenefit | (240,000)us-gaap_IncomeTaxExpenseBenefit |  |  |  |
Income (loss) from investments in unconsolidated entities | 2,963,000 us-gaap_IncomeLossFromEquityMethodInvestments | (1,409,000)us-gaap_IncomeLossFromEquityMethodInvestments |  |  |  |
Net income | 190,224,000 us-gaap_ProfitLoss | 82,732,000 us-gaap_ProfitLoss |  |  |  |
Consolidated Development Projects Held for and or Under Development [Member] |  |  |  |  |  |
Investments In Partially Owned Entities (Textuals) [Abstract] |  |  |  |  |  |
Investments in unconsolidated entities | 0 us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures / us-gaap_StatementScenarioAxis = eqr_ConsolidatedDevelopmentProjectsHeldForAndOrUnderDevelopmentMember |  | 0 us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures / us-gaap_StatementScenarioAxis = eqr_ConsolidatedDevelopmentProjectsHeldForAndOrUnderDevelopmentMember |  |  |
Secured Debt | 0 us-gaap_SecuredDebt / us-gaap_StatementScenarioAxis = eqr_ConsolidatedDevelopmentProjectsHeldForAndOrUnderDevelopmentMember |  | 0 us-gaap_SecuredDebt / us-gaap_StatementScenarioAxis = eqr_ConsolidatedDevelopmentProjectsHeldForAndOrUnderDevelopmentMember |  |  |
Noncontrolling Interests - Partially Owned Properties/Partners' equity | 117,350,000 eqr_NoncontrollingInterestsPartiallyOwnedProperties / us-gaap_StatementScenarioAxis = eqr_ConsolidatedDevelopmentProjectsHeldForAndOrUnderDevelopmentMember |  | 117,350,000 eqr_NoncontrollingInterestsPartiallyOwnedProperties / us-gaap_StatementScenarioAxis = eqr_ConsolidatedDevelopmentProjectsHeldForAndOrUnderDevelopmentMember |  |  |
Partially Owned Property Balance Sheet Schedule |  |  |  |  |  |
Number of Real Estate Properties | 0 us-gaap_NumberOfRealEstateProperties / us-gaap_StatementScenarioAxis = eqr_ConsolidatedDevelopmentProjectsHeldForAndOrUnderDevelopmentMember |  | 0 us-gaap_NumberOfRealEstateProperties / us-gaap_StatementScenarioAxis = eqr_ConsolidatedDevelopmentProjectsHeldForAndOrUnderDevelopmentMember |  |  |
Number of Units in Real Estate Property | 0 us-gaap_NumberOfUnitsInRealEstateProperty / us-gaap_StatementScenarioAxis = eqr_ConsolidatedDevelopmentProjectsHeldForAndOrUnderDevelopmentMember |  | 0 us-gaap_NumberOfUnitsInRealEstateProperty / us-gaap_StatementScenarioAxis = eqr_ConsolidatedDevelopmentProjectsHeldForAndOrUnderDevelopmentMember |  |  |
ASSETS |  |  |  |  |  |
Investment in real estate | 347,809,000 us-gaap_RealEstateInvestmentPropertyAtCost / us-gaap_StatementScenarioAxis = eqr_ConsolidatedDevelopmentProjectsHeldForAndOrUnderDevelopmentMember |  | 347,809,000 us-gaap_RealEstateInvestmentPropertyAtCost / us-gaap_StatementScenarioAxis = eqr_ConsolidatedDevelopmentProjectsHeldForAndOrUnderDevelopmentMember |  |  |
Real Estate Investment Property, Accumulated Depreciation | (991,000)us-gaap_RealEstateInvestmentPropertyAccumulatedDepreciation / us-gaap_StatementScenarioAxis = eqr_ConsolidatedDevelopmentProjectsHeldForAndOrUnderDevelopmentMember |  | (991,000)us-gaap_RealEstateInvestmentPropertyAccumulatedDepreciation / us-gaap_StatementScenarioAxis = eqr_ConsolidatedDevelopmentProjectsHeldForAndOrUnderDevelopmentMember |  |  |
Investment in real estate, net | 346,818,000 us-gaap_RealEstateInvestmentPropertyNet / us-gaap_StatementScenarioAxis = eqr_ConsolidatedDevelopmentProjectsHeldForAndOrUnderDevelopmentMember |  | 346,818,000 us-gaap_RealEstateInvestmentPropertyNet / us-gaap_StatementScenarioAxis = eqr_ConsolidatedDevelopmentProjectsHeldForAndOrUnderDevelopmentMember |  |  |
Cash and cash equivalents | 0 us-gaap_CashAndCashEquivalentsAtCarryingValue / us-gaap_StatementScenarioAxis = eqr_ConsolidatedDevelopmentProjectsHeldForAndOrUnderDevelopmentMember |  | 0 us-gaap_CashAndCashEquivalentsAtCarryingValue / us-gaap_StatementScenarioAxis = eqr_ConsolidatedDevelopmentProjectsHeldForAndOrUnderDevelopmentMember |  |  |
Investments in unconsolidated entities | 0 us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures / us-gaap_StatementScenarioAxis = eqr_ConsolidatedDevelopmentProjectsHeldForAndOrUnderDevelopmentMember |  | 0 us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures / us-gaap_StatementScenarioAxis = eqr_ConsolidatedDevelopmentProjectsHeldForAndOrUnderDevelopmentMember |  |  |
Deposits - restricted | 15,640,000 us-gaap_RestrictedCashAndCashEquivalents / us-gaap_StatementScenarioAxis = eqr_ConsolidatedDevelopmentProjectsHeldForAndOrUnderDevelopmentMember |  | 15,640,000 us-gaap_RestrictedCashAndCashEquivalents / us-gaap_StatementScenarioAxis = eqr_ConsolidatedDevelopmentProjectsHeldForAndOrUnderDevelopmentMember |  |  |
Deferred financing costs, net | 0 us-gaap_DeferredFinanceCostsNet / us-gaap_StatementScenarioAxis = eqr_ConsolidatedDevelopmentProjectsHeldForAndOrUnderDevelopmentMember |  | 0 us-gaap_DeferredFinanceCostsNet / us-gaap_StatementScenarioAxis = eqr_ConsolidatedDevelopmentProjectsHeldForAndOrUnderDevelopmentMember |  |  |
Other Assets | 6,697,000 us-gaap_OtherAssets / us-gaap_StatementScenarioAxis = eqr_ConsolidatedDevelopmentProjectsHeldForAndOrUnderDevelopmentMember |  | 6,697,000 us-gaap_OtherAssets / us-gaap_StatementScenarioAxis = eqr_ConsolidatedDevelopmentProjectsHeldForAndOrUnderDevelopmentMember |  |  |
Total assets | 369,155,000 us-gaap_Assets / us-gaap_StatementScenarioAxis = eqr_ConsolidatedDevelopmentProjectsHeldForAndOrUnderDevelopmentMember |  | 369,155,000 us-gaap_Assets / us-gaap_StatementScenarioAxis = eqr_ConsolidatedDevelopmentProjectsHeldForAndOrUnderDevelopmentMember |  |  |
LIABILITIES AND EQUITY |  |  |  |  |  |
Secured Debt | 0 us-gaap_SecuredDebt / us-gaap_StatementScenarioAxis = eqr_ConsolidatedDevelopmentProjectsHeldForAndOrUnderDevelopmentMember |  | 0 us-gaap_SecuredDebt / us-gaap_StatementScenarioAxis = eqr_ConsolidatedDevelopmentProjectsHeldForAndOrUnderDevelopmentMember |  |  |
Accounts Payable And Accrued Liabilities Current And Noncurrent Other Than Interest And Dividend Payable | 8,731,000 eqr_AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrentOtherThanInterestAndDividendPayable / us-gaap_StatementScenarioAxis = eqr_ConsolidatedDevelopmentProjectsHeldForAndOrUnderDevelopmentMember |  | 8,731,000 eqr_AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrentOtherThanInterestAndDividendPayable / us-gaap_StatementScenarioAxis = eqr_ConsolidatedDevelopmentProjectsHeldForAndOrUnderDevelopmentMember |  |  |
Accrued interest payable | 0 us-gaap_InterestPayableCurrentAndNoncurrent / us-gaap_StatementScenarioAxis = eqr_ConsolidatedDevelopmentProjectsHeldForAndOrUnderDevelopmentMember |  | 0 us-gaap_InterestPayableCurrentAndNoncurrent / us-gaap_StatementScenarioAxis = eqr_ConsolidatedDevelopmentProjectsHeldForAndOrUnderDevelopmentMember |  |  |
Other liabilities | 257,000 us-gaap_OtherLiabilities / us-gaap_StatementScenarioAxis = eqr_ConsolidatedDevelopmentProjectsHeldForAndOrUnderDevelopmentMember |  | 257,000 us-gaap_OtherLiabilities / us-gaap_StatementScenarioAxis = eqr_ConsolidatedDevelopmentProjectsHeldForAndOrUnderDevelopmentMember |  |  |
Security deposits | 150,000 us-gaap_SecurityDepositLiability / us-gaap_StatementScenarioAxis = eqr_ConsolidatedDevelopmentProjectsHeldForAndOrUnderDevelopmentMember |  | 150,000 us-gaap_SecurityDepositLiability / us-gaap_StatementScenarioAxis = eqr_ConsolidatedDevelopmentProjectsHeldForAndOrUnderDevelopmentMember |  |  |
Total liabilities | 9,138,000 us-gaap_Liabilities / us-gaap_StatementScenarioAxis = eqr_ConsolidatedDevelopmentProjectsHeldForAndOrUnderDevelopmentMember |  | 9,138,000 us-gaap_Liabilities / us-gaap_StatementScenarioAxis = eqr_ConsolidatedDevelopmentProjectsHeldForAndOrUnderDevelopmentMember |  |  |
Noncontrolling Interests - Partially Owned Properties/Partners' equity | 117,350,000 eqr_NoncontrollingInterestsPartiallyOwnedProperties / us-gaap_StatementScenarioAxis = eqr_ConsolidatedDevelopmentProjectsHeldForAndOrUnderDevelopmentMember |  | 117,350,000 eqr_NoncontrollingInterestsPartiallyOwnedProperties / us-gaap_StatementScenarioAxis = eqr_ConsolidatedDevelopmentProjectsHeldForAndOrUnderDevelopmentMember |  |  |
Company equity/General and Limited Partners' Capital | 242,667,000 eqr_ParentEquityInterest / us-gaap_StatementScenarioAxis = eqr_ConsolidatedDevelopmentProjectsHeldForAndOrUnderDevelopmentMember |  | 242,667,000 eqr_ParentEquityInterest / us-gaap_StatementScenarioAxis = eqr_ConsolidatedDevelopmentProjectsHeldForAndOrUnderDevelopmentMember |  |  |
Total equity/capital | 360,017,000 eqr_TotalEquityInterest / us-gaap_StatementScenarioAxis = eqr_ConsolidatedDevelopmentProjectsHeldForAndOrUnderDevelopmentMember |  | 360,017,000 eqr_TotalEquityInterest / us-gaap_StatementScenarioAxis = eqr_ConsolidatedDevelopmentProjectsHeldForAndOrUnderDevelopmentMember |  |  |
Total liabilities and equity | 369,155,000 us-gaap_LiabilitiesAndStockholdersEquity / us-gaap_StatementScenarioAxis = eqr_ConsolidatedDevelopmentProjectsHeldForAndOrUnderDevelopmentMember |  | 369,155,000 us-gaap_LiabilitiesAndStockholdersEquity / us-gaap_StatementScenarioAxis = eqr_ConsolidatedDevelopmentProjectsHeldForAndOrUnderDevelopmentMember |  |  |
Partially Owned Property Income Statement Schedule |  |  |  |  |  |
Operating revenue | 250,000 us-gaap_Revenues / us-gaap_StatementScenarioAxis = eqr_ConsolidatedDevelopmentProjectsHeldForAndOrUnderDevelopmentMember |  |  |  |  |
Operating expenses | 418,000 eqr_RealEstateOperatingExpenses / us-gaap_StatementScenarioAxis = eqr_ConsolidatedDevelopmentProjectsHeldForAndOrUnderDevelopmentMember |  |  |  |  |
Net operating (loss) income | (168,000)us-gaap_GrossProfit / us-gaap_StatementScenarioAxis = eqr_ConsolidatedDevelopmentProjectsHeldForAndOrUnderDevelopmentMember |  |  |  |  |
Depreciation | 991,000 us-gaap_Depreciation / us-gaap_StatementScenarioAxis = eqr_ConsolidatedDevelopmentProjectsHeldForAndOrUnderDevelopmentMember |  |  |  |  |
General and administrative/other | 0 us-gaap_GeneralAndAdministrativeExpense / us-gaap_StatementScenarioAxis = eqr_ConsolidatedDevelopmentProjectsHeldForAndOrUnderDevelopmentMember |  |  |  |  |
Operating Income | (1,159,000)us-gaap_OperatingIncomeLoss / us-gaap_StatementScenarioAxis = eqr_ConsolidatedDevelopmentProjectsHeldForAndOrUnderDevelopmentMember |  |  |  |  |
Interest and other income | 0 us-gaap_InterestAndOtherIncome / us-gaap_StatementScenarioAxis = eqr_ConsolidatedDevelopmentProjectsHeldForAndOrUnderDevelopmentMember |  |  |  |  |
Other expenses | 0 us-gaap_OtherNonoperatingIncomeExpense / us-gaap_StatementScenarioAxis = eqr_ConsolidatedDevelopmentProjectsHeldForAndOrUnderDevelopmentMember |  |  |  |  |
Interest: |  |  |  |  |  |
Expense incurred, net | 0 us-gaap_InterestExpenseDebt / us-gaap_StatementScenarioAxis = eqr_ConsolidatedDevelopmentProjectsHeldForAndOrUnderDevelopmentMember |  |  |  |  |
Amortization of deferred financing costs | 0 us-gaap_AmortizationOfFinancingCosts / us-gaap_StatementScenarioAxis = eqr_ConsolidatedDevelopmentProjectsHeldForAndOrUnderDevelopmentMember |  |  |  |  |
Income before income and other taxes, income (loss) from investments in unconsolidated entities, net gain (loss) on sales of real estate properties and land parcels and discontinued operations | (1,159,000)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_StatementScenarioAxis = eqr_ConsolidatedDevelopmentProjectsHeldForAndOrUnderDevelopmentMember |  |  |  |  |
Income and other tax (expense) benefit | 0 us-gaap_IncomeTaxExpenseBenefit / us-gaap_StatementScenarioAxis = eqr_ConsolidatedDevelopmentProjectsHeldForAndOrUnderDevelopmentMember |  |  |  |  |
Income (loss) from investments in unconsolidated entities | 0 us-gaap_IncomeLossFromEquityMethodInvestments / us-gaap_StatementScenarioAxis = eqr_ConsolidatedDevelopmentProjectsHeldForAndOrUnderDevelopmentMember |  |  |  |  |
Net income | (1,159,000)us-gaap_ProfitLoss / us-gaap_StatementScenarioAxis = eqr_ConsolidatedDevelopmentProjectsHeldForAndOrUnderDevelopmentMember |  |  |  |  |
Consolidated Operating [Domain] |  |  |  |  |  |
Investments In Partially Owned Entities (Textuals) [Abstract] |  |  |  |  |  |
Investments in unconsolidated entities | 51,363,000 us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures / us-gaap_StatementScenarioAxis = eqr_ConsolidatedOperatingDomain |  | 51,363,000 us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures / us-gaap_StatementScenarioAxis = eqr_ConsolidatedOperatingDomain |  |  |
Secured Debt | 360,567,000 us-gaap_SecuredDebt / us-gaap_StatementScenarioAxis = eqr_ConsolidatedOperatingDomain |  | 360,567,000 us-gaap_SecuredDebt / us-gaap_StatementScenarioAxis = eqr_ConsolidatedOperatingDomain |  |  |
Noncontrolling Interests - Partially Owned Properties/Partners' equity | 5,311,000 eqr_NoncontrollingInterestsPartiallyOwnedProperties / us-gaap_StatementScenarioAxis = eqr_ConsolidatedOperatingDomain |  | 5,311,000 eqr_NoncontrollingInterestsPartiallyOwnedProperties / us-gaap_StatementScenarioAxis = eqr_ConsolidatedOperatingDomain |  |  |
Partially Owned Property Balance Sheet Schedule |  |  |  |  |  |
Number of Real Estate Properties | 19 us-gaap_NumberOfRealEstateProperties / us-gaap_StatementScenarioAxis = eqr_ConsolidatedOperatingDomain |  | 19 us-gaap_NumberOfRealEstateProperties / us-gaap_StatementScenarioAxis = eqr_ConsolidatedOperatingDomain |  |  |
Number of Units in Real Estate Property | 3,771 us-gaap_NumberOfUnitsInRealEstateProperty / us-gaap_StatementScenarioAxis = eqr_ConsolidatedOperatingDomain |  | 3,771 us-gaap_NumberOfUnitsInRealEstateProperty / us-gaap_StatementScenarioAxis = eqr_ConsolidatedOperatingDomain |  |  |
ASSETS |  |  |  |  |  |
Investment in real estate | 684,686,000 us-gaap_RealEstateInvestmentPropertyAtCost / us-gaap_StatementScenarioAxis = eqr_ConsolidatedOperatingDomain |  | 684,686,000 us-gaap_RealEstateInvestmentPropertyAtCost / us-gaap_StatementScenarioAxis = eqr_ConsolidatedOperatingDomain |  |  |
Real Estate Investment Property, Accumulated Depreciation | (200,002,000)us-gaap_RealEstateInvestmentPropertyAccumulatedDepreciation / us-gaap_StatementScenarioAxis = eqr_ConsolidatedOperatingDomain |  | (200,002,000)us-gaap_RealEstateInvestmentPropertyAccumulatedDepreciation / us-gaap_StatementScenarioAxis = eqr_ConsolidatedOperatingDomain |  |  |
Investment in real estate, net | 484,684,000 us-gaap_RealEstateInvestmentPropertyNet / us-gaap_StatementScenarioAxis = eqr_ConsolidatedOperatingDomain |  | 484,684,000 us-gaap_RealEstateInvestmentPropertyNet / us-gaap_StatementScenarioAxis = eqr_ConsolidatedOperatingDomain |  |  |
Cash and cash equivalents | 13,775,000 us-gaap_CashAndCashEquivalentsAtCarryingValue / us-gaap_StatementScenarioAxis = eqr_ConsolidatedOperatingDomain |  | 13,775,000 us-gaap_CashAndCashEquivalentsAtCarryingValue / us-gaap_StatementScenarioAxis = eqr_ConsolidatedOperatingDomain |  |  |
Investments in unconsolidated entities | 51,363,000 us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures / us-gaap_StatementScenarioAxis = eqr_ConsolidatedOperatingDomain |  | 51,363,000 us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures / us-gaap_StatementScenarioAxis = eqr_ConsolidatedOperatingDomain |  |  |
Deposits - restricted | 310,000 us-gaap_RestrictedCashAndCashEquivalents / us-gaap_StatementScenarioAxis = eqr_ConsolidatedOperatingDomain |  | 310,000 us-gaap_RestrictedCashAndCashEquivalents / us-gaap_StatementScenarioAxis = eqr_ConsolidatedOperatingDomain |  |  |
Deferred financing costs, net | 2,052,000 us-gaap_DeferredFinanceCostsNet / us-gaap_StatementScenarioAxis = eqr_ConsolidatedOperatingDomain |  | 2,052,000 us-gaap_DeferredFinanceCostsNet / us-gaap_StatementScenarioAxis = eqr_ConsolidatedOperatingDomain |  |  |
Other Assets | 26,227,000 us-gaap_OtherAssets / us-gaap_StatementScenarioAxis = eqr_ConsolidatedOperatingDomain |  | 26,227,000 us-gaap_OtherAssets / us-gaap_StatementScenarioAxis = eqr_ConsolidatedOperatingDomain |  |  |
Total assets | 578,411,000 us-gaap_Assets / us-gaap_StatementScenarioAxis = eqr_ConsolidatedOperatingDomain |  | 578,411,000 us-gaap_Assets / us-gaap_StatementScenarioAxis = eqr_ConsolidatedOperatingDomain |  |  |
LIABILITIES AND EQUITY |  |  |  |  |  |
Secured Debt | 360,567,000 us-gaap_SecuredDebt / us-gaap_StatementScenarioAxis = eqr_ConsolidatedOperatingDomain |  | 360,567,000 us-gaap_SecuredDebt / us-gaap_StatementScenarioAxis = eqr_ConsolidatedOperatingDomain |  |  |
Accounts Payable And Accrued Liabilities Current And Noncurrent Other Than Interest And Dividend Payable | 3,188,000 eqr_AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrentOtherThanInterestAndDividendPayable / us-gaap_StatementScenarioAxis = eqr_ConsolidatedOperatingDomain |  | 3,188,000 eqr_AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrentOtherThanInterestAndDividendPayable / us-gaap_StatementScenarioAxis = eqr_ConsolidatedOperatingDomain |  |  |
Accrued interest payable | 1,283,000 us-gaap_InterestPayableCurrentAndNoncurrent / us-gaap_StatementScenarioAxis = eqr_ConsolidatedOperatingDomain |  | 1,283,000 us-gaap_InterestPayableCurrentAndNoncurrent / us-gaap_StatementScenarioAxis = eqr_ConsolidatedOperatingDomain |  |  |
Other liabilities | 576,000 us-gaap_OtherLiabilities / us-gaap_StatementScenarioAxis = eqr_ConsolidatedOperatingDomain |  | 576,000 us-gaap_OtherLiabilities / us-gaap_StatementScenarioAxis = eqr_ConsolidatedOperatingDomain |  |  |
Security deposits | 1,976,000 us-gaap_SecurityDepositLiability / us-gaap_StatementScenarioAxis = eqr_ConsolidatedOperatingDomain |  | 1,976,000 us-gaap_SecurityDepositLiability / us-gaap_StatementScenarioAxis = eqr_ConsolidatedOperatingDomain |  |  |
Total liabilities | 367,590,000 us-gaap_Liabilities / us-gaap_StatementScenarioAxis = eqr_ConsolidatedOperatingDomain |  | 367,590,000 us-gaap_Liabilities / us-gaap_StatementScenarioAxis = eqr_ConsolidatedOperatingDomain |  |  |
Noncontrolling Interests - Partially Owned Properties/Partners' equity | 5,311,000 eqr_NoncontrollingInterestsPartiallyOwnedProperties / us-gaap_StatementScenarioAxis = eqr_ConsolidatedOperatingDomain |  | 5,311,000 eqr_NoncontrollingInterestsPartiallyOwnedProperties / us-gaap_StatementScenarioAxis = eqr_ConsolidatedOperatingDomain |  |  |
Company equity/General and Limited Partners' Capital | 205,510,000 eqr_ParentEquityInterest / us-gaap_StatementScenarioAxis = eqr_ConsolidatedOperatingDomain |  | 205,510,000 eqr_ParentEquityInterest / us-gaap_StatementScenarioAxis = eqr_ConsolidatedOperatingDomain |  |  |
Total equity/capital | 210,821,000 eqr_TotalEquityInterest / us-gaap_StatementScenarioAxis = eqr_ConsolidatedOperatingDomain |  | 210,821,000 eqr_TotalEquityInterest / us-gaap_StatementScenarioAxis = eqr_ConsolidatedOperatingDomain |  |  |
Total liabilities and equity | 578,411,000 us-gaap_LiabilitiesAndStockholdersEquity / us-gaap_StatementScenarioAxis = eqr_ConsolidatedOperatingDomain |  | 578,411,000 us-gaap_LiabilitiesAndStockholdersEquity / us-gaap_StatementScenarioAxis = eqr_ConsolidatedOperatingDomain |  |  |
Partially Owned Property Income Statement Schedule |  |  |  |  |  |
Operating revenue | 22,688,000 us-gaap_Revenues / us-gaap_StatementScenarioAxis = eqr_ConsolidatedOperatingDomain |  |  |  |  |
Operating expenses | 6,875,000 eqr_RealEstateOperatingExpenses / us-gaap_StatementScenarioAxis = eqr_ConsolidatedOperatingDomain |  |  |  |  |
Net operating (loss) income | 15,813,000 us-gaap_GrossProfit / us-gaap_StatementScenarioAxis = eqr_ConsolidatedOperatingDomain |  |  |  |  |
Depreciation | 5,520,000 us-gaap_Depreciation / us-gaap_StatementScenarioAxis = eqr_ConsolidatedOperatingDomain |  |  |  |  |
General and administrative/other | 15,000 us-gaap_GeneralAndAdministrativeExpense / us-gaap_StatementScenarioAxis = eqr_ConsolidatedOperatingDomain |  |  |  |  |
Operating Income | 10,278,000 us-gaap_OperatingIncomeLoss / us-gaap_StatementScenarioAxis = eqr_ConsolidatedOperatingDomain |  |  |  |  |
Interest and other income | 4,000 us-gaap_InterestAndOtherIncome / us-gaap_StatementScenarioAxis = eqr_ConsolidatedOperatingDomain |  |  |  |  |
Other expenses | (50,000)us-gaap_OtherNonoperatingIncomeExpense / us-gaap_StatementScenarioAxis = eqr_ConsolidatedOperatingDomain |  |  |  |  |
Interest: |  |  |  |  |  |
Expense incurred, net | (3,884,000)us-gaap_InterestExpenseDebt / us-gaap_StatementScenarioAxis = eqr_ConsolidatedOperatingDomain |  |  |  |  |
Amortization of deferred financing costs | (89,000)us-gaap_AmortizationOfFinancingCosts / us-gaap_StatementScenarioAxis = eqr_ConsolidatedOperatingDomain |  |  |  |  |
Income before income and other taxes, income (loss) from investments in unconsolidated entities, net gain (loss) on sales of real estate properties and land parcels and discontinued operations | 6,259,000 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_StatementScenarioAxis = eqr_ConsolidatedOperatingDomain |  |  |  |  |
Income and other tax (expense) benefit | (35,000)us-gaap_IncomeTaxExpenseBenefit / us-gaap_StatementScenarioAxis = eqr_ConsolidatedOperatingDomain |  |  |  |  |
Income (loss) from investments in unconsolidated entities | (377,000)us-gaap_IncomeLossFromEquityMethodInvestments / us-gaap_StatementScenarioAxis = eqr_ConsolidatedOperatingDomain |  |  |  |  |
Net income | 5,847,000 us-gaap_ProfitLoss / us-gaap_StatementScenarioAxis = eqr_ConsolidatedOperatingDomain |  |  |  |  |
Consolidated Total [Domain] |  |  |  |  |  |
Investments In Partially Owned Entities (Textuals) [Abstract] |  |  |  |  |  |
Investments in unconsolidated entities | 51,363,000 us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures / us-gaap_StatementScenarioAxis = eqr_ConsolidatedTotalDomain |  | 51,363,000 us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures / us-gaap_StatementScenarioAxis = eqr_ConsolidatedTotalDomain |  |  |
Secured Debt | 360,567,000 us-gaap_SecuredDebt / us-gaap_StatementScenarioAxis = eqr_ConsolidatedTotalDomain |  | 360,567,000 us-gaap_SecuredDebt / us-gaap_StatementScenarioAxis = eqr_ConsolidatedTotalDomain |  |  |
Noncontrolling Interests - Partially Owned Properties/Partners' equity | 122,661,000 eqr_NoncontrollingInterestsPartiallyOwnedProperties / us-gaap_StatementScenarioAxis = eqr_ConsolidatedTotalDomain |  | 122,661,000 eqr_NoncontrollingInterestsPartiallyOwnedProperties / us-gaap_StatementScenarioAxis = eqr_ConsolidatedTotalDomain |  |  |
Partially Owned Property Balance Sheet Schedule |  |  |  |  |  |
Number of Real Estate Properties | 19 us-gaap_NumberOfRealEstateProperties / us-gaap_StatementScenarioAxis = eqr_ConsolidatedTotalDomain |  | 19 us-gaap_NumberOfRealEstateProperties / us-gaap_StatementScenarioAxis = eqr_ConsolidatedTotalDomain |  |  |
Number of Units in Real Estate Property | 3,771 us-gaap_NumberOfUnitsInRealEstateProperty / us-gaap_StatementScenarioAxis = eqr_ConsolidatedTotalDomain |  | 3,771 us-gaap_NumberOfUnitsInRealEstateProperty / us-gaap_StatementScenarioAxis = eqr_ConsolidatedTotalDomain |  |  |
ASSETS |  |  |  |  |  |
Investment in real estate | 1,032,495,000 us-gaap_RealEstateInvestmentPropertyAtCost / us-gaap_StatementScenarioAxis = eqr_ConsolidatedTotalDomain |  | 1,032,495,000 us-gaap_RealEstateInvestmentPropertyAtCost / us-gaap_StatementScenarioAxis = eqr_ConsolidatedTotalDomain |  |  |
Real Estate Investment Property, Accumulated Depreciation | (200,993,000)us-gaap_RealEstateInvestmentPropertyAccumulatedDepreciation / us-gaap_StatementScenarioAxis = eqr_ConsolidatedTotalDomain |  | (200,993,000)us-gaap_RealEstateInvestmentPropertyAccumulatedDepreciation / us-gaap_StatementScenarioAxis = eqr_ConsolidatedTotalDomain |  |  |
Investment in real estate, net | 831,502,000 us-gaap_RealEstateInvestmentPropertyNet / us-gaap_StatementScenarioAxis = eqr_ConsolidatedTotalDomain |  | 831,502,000 us-gaap_RealEstateInvestmentPropertyNet / us-gaap_StatementScenarioAxis = eqr_ConsolidatedTotalDomain |  |  |
Cash and cash equivalents | 13,775,000 us-gaap_CashAndCashEquivalentsAtCarryingValue / us-gaap_StatementScenarioAxis = eqr_ConsolidatedTotalDomain |  | 13,775,000 us-gaap_CashAndCashEquivalentsAtCarryingValue / us-gaap_StatementScenarioAxis = eqr_ConsolidatedTotalDomain |  |  |
Investments in unconsolidated entities | 51,363,000 us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures / us-gaap_StatementScenarioAxis = eqr_ConsolidatedTotalDomain |  | 51,363,000 us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures / us-gaap_StatementScenarioAxis = eqr_ConsolidatedTotalDomain |  |  |
Deposits - restricted | 15,950,000 us-gaap_RestrictedCashAndCashEquivalents / us-gaap_StatementScenarioAxis = eqr_ConsolidatedTotalDomain |  | 15,950,000 us-gaap_RestrictedCashAndCashEquivalents / us-gaap_StatementScenarioAxis = eqr_ConsolidatedTotalDomain |  |  |
Deferred financing costs, net | 2,052,000 us-gaap_DeferredFinanceCostsNet / us-gaap_StatementScenarioAxis = eqr_ConsolidatedTotalDomain |  | 2,052,000 us-gaap_DeferredFinanceCostsNet / us-gaap_StatementScenarioAxis = eqr_ConsolidatedTotalDomain |  |  |
Other Assets | 32,924,000 us-gaap_OtherAssets / us-gaap_StatementScenarioAxis = eqr_ConsolidatedTotalDomain |  | 32,924,000 us-gaap_OtherAssets / us-gaap_StatementScenarioAxis = eqr_ConsolidatedTotalDomain |  |  |
Total assets | 947,566,000 us-gaap_Assets / us-gaap_StatementScenarioAxis = eqr_ConsolidatedTotalDomain |  | 947,566,000 us-gaap_Assets / us-gaap_StatementScenarioAxis = eqr_ConsolidatedTotalDomain |  |  |
LIABILITIES AND EQUITY |  |  |  |  |  |
Secured Debt | 360,567,000 us-gaap_SecuredDebt / us-gaap_StatementScenarioAxis = eqr_ConsolidatedTotalDomain |  | 360,567,000 us-gaap_SecuredDebt / us-gaap_StatementScenarioAxis = eqr_ConsolidatedTotalDomain |  |  |
Accounts Payable And Accrued Liabilities Current And Noncurrent Other Than Interest And Dividend Payable | 11,919,000 eqr_AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrentOtherThanInterestAndDividendPayable / us-gaap_StatementScenarioAxis = eqr_ConsolidatedTotalDomain |  | 11,919,000 eqr_AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrentOtherThanInterestAndDividendPayable / us-gaap_StatementScenarioAxis = eqr_ConsolidatedTotalDomain |  |  |
Accrued interest payable | 1,283,000 us-gaap_InterestPayableCurrentAndNoncurrent / us-gaap_StatementScenarioAxis = eqr_ConsolidatedTotalDomain |  | 1,283,000 us-gaap_InterestPayableCurrentAndNoncurrent / us-gaap_StatementScenarioAxis = eqr_ConsolidatedTotalDomain |  |  |
Other liabilities | 833,000 us-gaap_OtherLiabilities / us-gaap_StatementScenarioAxis = eqr_ConsolidatedTotalDomain |  | 833,000 us-gaap_OtherLiabilities / us-gaap_StatementScenarioAxis = eqr_ConsolidatedTotalDomain |  |  |
Security deposits | 2,126,000 us-gaap_SecurityDepositLiability / us-gaap_StatementScenarioAxis = eqr_ConsolidatedTotalDomain |  | 2,126,000 us-gaap_SecurityDepositLiability / us-gaap_StatementScenarioAxis = eqr_ConsolidatedTotalDomain |  |  |
Total liabilities | 376,728,000 us-gaap_Liabilities / us-gaap_StatementScenarioAxis = eqr_ConsolidatedTotalDomain |  | 376,728,000 us-gaap_Liabilities / us-gaap_StatementScenarioAxis = eqr_ConsolidatedTotalDomain |  |  |
Noncontrolling Interests - Partially Owned Properties/Partners' equity | 122,661,000 eqr_NoncontrollingInterestsPartiallyOwnedProperties / us-gaap_StatementScenarioAxis = eqr_ConsolidatedTotalDomain |  | 122,661,000 eqr_NoncontrollingInterestsPartiallyOwnedProperties / us-gaap_StatementScenarioAxis = eqr_ConsolidatedTotalDomain |  |  |
Company equity/General and Limited Partners' Capital | 448,177,000 eqr_ParentEquityInterest / us-gaap_StatementScenarioAxis = eqr_ConsolidatedTotalDomain |  | 448,177,000 eqr_ParentEquityInterest / us-gaap_StatementScenarioAxis = eqr_ConsolidatedTotalDomain |  |  |
Total equity/capital | 570,838,000 eqr_TotalEquityInterest / us-gaap_StatementScenarioAxis = eqr_ConsolidatedTotalDomain |  | 570,838,000 eqr_TotalEquityInterest / us-gaap_StatementScenarioAxis = eqr_ConsolidatedTotalDomain |  |  |
Total liabilities and equity | 947,566,000 us-gaap_LiabilitiesAndStockholdersEquity / us-gaap_StatementScenarioAxis = eqr_ConsolidatedTotalDomain |  | 947,566,000 us-gaap_LiabilitiesAndStockholdersEquity / us-gaap_StatementScenarioAxis = eqr_ConsolidatedTotalDomain |  |  |
Partially Owned Property Income Statement Schedule |  |  |  |  |  |
Operating revenue | 22,938,000 us-gaap_Revenues / us-gaap_StatementScenarioAxis = eqr_ConsolidatedTotalDomain |  |  |  |  |
Operating expenses | 7,293,000 eqr_RealEstateOperatingExpenses / us-gaap_StatementScenarioAxis = eqr_ConsolidatedTotalDomain |  |  |  |  |
Net operating (loss) income | 15,645,000 us-gaap_GrossProfit / us-gaap_StatementScenarioAxis = eqr_ConsolidatedTotalDomain |  |  |  |  |
Depreciation | 6,511,000 us-gaap_Depreciation / us-gaap_StatementScenarioAxis = eqr_ConsolidatedTotalDomain |  |  |  |  |
General and administrative/other | 15,000 us-gaap_GeneralAndAdministrativeExpense / us-gaap_StatementScenarioAxis = eqr_ConsolidatedTotalDomain |  |  |  |  |
Operating Income | 9,119,000 us-gaap_OperatingIncomeLoss / us-gaap_StatementScenarioAxis = eqr_ConsolidatedTotalDomain |  |  |  |  |
Interest and other income | 4,000 us-gaap_InterestAndOtherIncome / us-gaap_StatementScenarioAxis = eqr_ConsolidatedTotalDomain |  |  |  |  |
Other expenses | (50,000)us-gaap_OtherNonoperatingIncomeExpense / us-gaap_StatementScenarioAxis = eqr_ConsolidatedTotalDomain |  |  |  |  |
Interest: |  |  |  |  |  |
Expense incurred, net | (3,884,000)us-gaap_InterestExpenseDebt / us-gaap_StatementScenarioAxis = eqr_ConsolidatedTotalDomain |  |  |  |  |
Amortization of deferred financing costs | (89,000)us-gaap_AmortizationOfFinancingCosts / us-gaap_StatementScenarioAxis = eqr_ConsolidatedTotalDomain |  |  |  |  |
Income before income and other taxes, income (loss) from investments in unconsolidated entities, net gain (loss) on sales of real estate properties and land parcels and discontinued operations | 5,100,000 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_StatementScenarioAxis = eqr_ConsolidatedTotalDomain |  |  |  |  |
Income and other tax (expense) benefit | (35,000)us-gaap_IncomeTaxExpenseBenefit / us-gaap_StatementScenarioAxis = eqr_ConsolidatedTotalDomain |  |  |  |  |
Income (loss) from investments in unconsolidated entities | (377,000)us-gaap_IncomeLossFromEquityMethodInvestments / us-gaap_StatementScenarioAxis = eqr_ConsolidatedTotalDomain |  |  |  |  |
Net income | 4,688,000 us-gaap_ProfitLoss / us-gaap_StatementScenarioAxis = eqr_ConsolidatedTotalDomain |  |  |  |  |
Unconsolidated Operating [Domain] |  |  |  |  |  |
Investments In Partially Owned Entities (Textuals) [Abstract] |  |  |  |  |  |
Investments in unconsolidated entities | 0 us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures / us-gaap_StatementScenarioAxis = eqr_UnconsolidatedOperatingDomain |  | 0 us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures / us-gaap_StatementScenarioAxis = eqr_UnconsolidatedOperatingDomain |  |  |
Secured Debt | 175,276,000 us-gaap_SecuredDebt / us-gaap_StatementScenarioAxis = eqr_UnconsolidatedOperatingDomain |  | 175,276,000 us-gaap_SecuredDebt / us-gaap_StatementScenarioAxis = eqr_UnconsolidatedOperatingDomain |  |  |
Noncontrolling Interests - Partially Owned Properties/Partners' equity | 90,878,000 eqr_NoncontrollingInterestsPartiallyOwnedProperties / us-gaap_StatementScenarioAxis = eqr_UnconsolidatedOperatingDomain |  | 90,878,000 eqr_NoncontrollingInterestsPartiallyOwnedProperties / us-gaap_StatementScenarioAxis = eqr_UnconsolidatedOperatingDomain |  |  |
Partially Owned Property Balance Sheet Schedule |  |  |  |  |  |
Number of Real Estate Properties | 3 us-gaap_NumberOfRealEstateProperties / us-gaap_StatementScenarioAxis = eqr_UnconsolidatedOperatingDomain |  | 3 us-gaap_NumberOfRealEstateProperties / us-gaap_StatementScenarioAxis = eqr_UnconsolidatedOperatingDomain |  |  |
Number of Units in Real Estate Property | 1,281 us-gaap_NumberOfUnitsInRealEstateProperty / us-gaap_StatementScenarioAxis = eqr_UnconsolidatedOperatingDomain |  | 1,281 us-gaap_NumberOfUnitsInRealEstateProperty / us-gaap_StatementScenarioAxis = eqr_UnconsolidatedOperatingDomain |  |  |
ASSETS |  |  |  |  |  |
Investment in real estate | 290,077,000 us-gaap_RealEstateInvestmentPropertyAtCost / us-gaap_StatementScenarioAxis = eqr_UnconsolidatedOperatingDomain |  | 290,077,000 us-gaap_RealEstateInvestmentPropertyAtCost / us-gaap_StatementScenarioAxis = eqr_UnconsolidatedOperatingDomain |  |  |
Real Estate Investment Property, Accumulated Depreciation | (21,388,000)us-gaap_RealEstateInvestmentPropertyAccumulatedDepreciation / us-gaap_StatementScenarioAxis = eqr_UnconsolidatedOperatingDomain |  | (21,388,000)us-gaap_RealEstateInvestmentPropertyAccumulatedDepreciation / us-gaap_StatementScenarioAxis = eqr_UnconsolidatedOperatingDomain |  |  |
Investment in real estate, net | 268,689,000 us-gaap_RealEstateInvestmentPropertyNet / us-gaap_StatementScenarioAxis = eqr_UnconsolidatedOperatingDomain |  | 268,689,000 us-gaap_RealEstateInvestmentPropertyNet / us-gaap_StatementScenarioAxis = eqr_UnconsolidatedOperatingDomain |  |  |
Cash and cash equivalents | 7,598,000 us-gaap_CashAndCashEquivalentsAtCarryingValue / us-gaap_StatementScenarioAxis = eqr_UnconsolidatedOperatingDomain |  | 7,598,000 us-gaap_CashAndCashEquivalentsAtCarryingValue / us-gaap_StatementScenarioAxis = eqr_UnconsolidatedOperatingDomain |  |  |
Investments in unconsolidated entities | 0 us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures / us-gaap_StatementScenarioAxis = eqr_UnconsolidatedOperatingDomain |  | 0 us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures / us-gaap_StatementScenarioAxis = eqr_UnconsolidatedOperatingDomain |  |  |
Deposits - restricted | 246,000 us-gaap_RestrictedCashAndCashEquivalents / us-gaap_StatementScenarioAxis = eqr_UnconsolidatedOperatingDomain |  | 246,000 us-gaap_RestrictedCashAndCashEquivalents / us-gaap_StatementScenarioAxis = eqr_UnconsolidatedOperatingDomain |  |  |
Deferred financing costs, net | 7,000 us-gaap_DeferredFinanceCostsNet / us-gaap_StatementScenarioAxis = eqr_UnconsolidatedOperatingDomain |  | 7,000 us-gaap_DeferredFinanceCostsNet / us-gaap_StatementScenarioAxis = eqr_UnconsolidatedOperatingDomain |  |  |
Other Assets | 1,327,000 us-gaap_OtherAssets / us-gaap_StatementScenarioAxis = eqr_UnconsolidatedOperatingDomain |  | 1,327,000 us-gaap_OtherAssets / us-gaap_StatementScenarioAxis = eqr_UnconsolidatedOperatingDomain |  |  |
Total assets | 277,867,000 us-gaap_Assets / us-gaap_StatementScenarioAxis = eqr_UnconsolidatedOperatingDomain |  | 277,867,000 us-gaap_Assets / us-gaap_StatementScenarioAxis = eqr_UnconsolidatedOperatingDomain |  |  |
LIABILITIES AND EQUITY |  |  |  |  |  |
Secured Debt | 175,276,000 us-gaap_SecuredDebt / us-gaap_StatementScenarioAxis = eqr_UnconsolidatedOperatingDomain |  | 175,276,000 us-gaap_SecuredDebt / us-gaap_StatementScenarioAxis = eqr_UnconsolidatedOperatingDomain |  |  |
Accounts Payable And Accrued Liabilities Current And Noncurrent Other Than Interest And Dividend Payable | 389,000 eqr_AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrentOtherThanInterestAndDividendPayable / us-gaap_StatementScenarioAxis = eqr_UnconsolidatedOperatingDomain |  | 389,000 eqr_AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrentOtherThanInterestAndDividendPayable / us-gaap_StatementScenarioAxis = eqr_UnconsolidatedOperatingDomain |  |  |
Accrued interest payable | 691,000 us-gaap_InterestPayableCurrentAndNoncurrent / us-gaap_StatementScenarioAxis = eqr_UnconsolidatedOperatingDomain |  | 691,000 us-gaap_InterestPayableCurrentAndNoncurrent / us-gaap_StatementScenarioAxis = eqr_UnconsolidatedOperatingDomain |  |  |
Other liabilities | 834,000 us-gaap_OtherLiabilities / us-gaap_StatementScenarioAxis = eqr_UnconsolidatedOperatingDomain |  | 834,000 us-gaap_OtherLiabilities / us-gaap_StatementScenarioAxis = eqr_UnconsolidatedOperatingDomain |  |  |
Security deposits | 531,000 us-gaap_SecurityDepositLiability / us-gaap_StatementScenarioAxis = eqr_UnconsolidatedOperatingDomain |  | 531,000 us-gaap_SecurityDepositLiability / us-gaap_StatementScenarioAxis = eqr_UnconsolidatedOperatingDomain |  |  |
Total liabilities | 177,721,000 us-gaap_Liabilities / us-gaap_StatementScenarioAxis = eqr_UnconsolidatedOperatingDomain |  | 177,721,000 us-gaap_Liabilities / us-gaap_StatementScenarioAxis = eqr_UnconsolidatedOperatingDomain |  |  |
Noncontrolling Interests - Partially Owned Properties/Partners' equity | 90,878,000 eqr_NoncontrollingInterestsPartiallyOwnedProperties / us-gaap_StatementScenarioAxis = eqr_UnconsolidatedOperatingDomain |  | 90,878,000 eqr_NoncontrollingInterestsPartiallyOwnedProperties / us-gaap_StatementScenarioAxis = eqr_UnconsolidatedOperatingDomain |  |  |
Company equity/General and Limited Partners' Capital | 9,268,000 eqr_ParentEquityInterest / us-gaap_StatementScenarioAxis = eqr_UnconsolidatedOperatingDomain |  | 9,268,000 eqr_ParentEquityInterest / us-gaap_StatementScenarioAxis = eqr_UnconsolidatedOperatingDomain |  |  |
Total equity/capital | 100,146,000 eqr_TotalEquityInterest / us-gaap_StatementScenarioAxis = eqr_UnconsolidatedOperatingDomain |  | 100,146,000 eqr_TotalEquityInterest / us-gaap_StatementScenarioAxis = eqr_UnconsolidatedOperatingDomain |  |  |
Total liabilities and equity | 277,867,000 us-gaap_LiabilitiesAndStockholdersEquity / us-gaap_StatementScenarioAxis = eqr_UnconsolidatedOperatingDomain |  | 277,867,000 us-gaap_LiabilitiesAndStockholdersEquity / us-gaap_StatementScenarioAxis = eqr_UnconsolidatedOperatingDomain |  |  |
Partially Owned Property Income Statement Schedule |  |  |  |  |  |
Operating revenue | 7,813,000 us-gaap_Revenues / us-gaap_StatementScenarioAxis = eqr_UnconsolidatedOperatingDomain |  |  |  |  |
Operating expenses | 2,443,000 eqr_RealEstateOperatingExpenses / us-gaap_StatementScenarioAxis = eqr_UnconsolidatedOperatingDomain |  |  |  |  |
Net operating (loss) income | 5,370,000 us-gaap_GrossProfit / us-gaap_StatementScenarioAxis = eqr_UnconsolidatedOperatingDomain |  |  |  |  |
Depreciation | 3,076,000 us-gaap_Depreciation / us-gaap_StatementScenarioAxis = eqr_UnconsolidatedOperatingDomain |  |  |  |  |
General and administrative/other | 56,000 us-gaap_GeneralAndAdministrativeExpense / us-gaap_StatementScenarioAxis = eqr_UnconsolidatedOperatingDomain |  |  |  |  |
Operating Income | 2,238,000 us-gaap_OperatingIncomeLoss / us-gaap_StatementScenarioAxis = eqr_UnconsolidatedOperatingDomain |  |  |  |  |
Interest and other income | 0 us-gaap_InterestAndOtherIncome / us-gaap_StatementScenarioAxis = eqr_UnconsolidatedOperatingDomain |  |  |  |  |
Other expenses | 0 us-gaap_OtherNonoperatingIncomeExpense / us-gaap_StatementScenarioAxis = eqr_UnconsolidatedOperatingDomain |  |  |  |  |
Interest: |  |  |  |  |  |
Expense incurred, net | (2,346,000)us-gaap_InterestExpenseDebt / us-gaap_StatementScenarioAxis = eqr_UnconsolidatedOperatingDomain |  |  |  |  |
Amortization of deferred financing costs | (1,000)us-gaap_AmortizationOfFinancingCosts / us-gaap_StatementScenarioAxis = eqr_UnconsolidatedOperatingDomain |  |  |  |  |
Income before income and other taxes, income (loss) from investments in unconsolidated entities, net gain (loss) on sales of real estate properties and land parcels and discontinued operations | (109,000)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_StatementScenarioAxis = eqr_UnconsolidatedOperatingDomain |  |  |  |  |
Income and other tax (expense) benefit | (18,000)us-gaap_IncomeTaxExpenseBenefit / us-gaap_StatementScenarioAxis = eqr_UnconsolidatedOperatingDomain |  |  |  |  |
Income (loss) from investments in unconsolidated entities | 0 us-gaap_IncomeLossFromEquityMethodInvestments / us-gaap_StatementScenarioAxis = eqr_UnconsolidatedOperatingDomain |  |  |  |  |
Net income | (127,000)us-gaap_ProfitLoss / us-gaap_StatementScenarioAxis = eqr_UnconsolidatedOperatingDomain |  |  |  |  |
Unconsolidated Total [Domain] |  |  |  |  |  |
Investments In Partially Owned Entities (Textuals) [Abstract] |  |  |  |  |  |
Investments in unconsolidated entities | 0 us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures / us-gaap_StatementScenarioAxis = eqr_UnconsolidatedTotalDomain |  | 0 us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures / us-gaap_StatementScenarioAxis = eqr_UnconsolidatedTotalDomain |  |  |
Secured Debt | 175,276,000 us-gaap_SecuredDebt / us-gaap_StatementScenarioAxis = eqr_UnconsolidatedTotalDomain |  | 175,276,000 us-gaap_SecuredDebt / us-gaap_StatementScenarioAxis = eqr_UnconsolidatedTotalDomain |  |  |
Noncontrolling Interests - Partially Owned Properties/Partners' equity | 90,878,000 eqr_NoncontrollingInterestsPartiallyOwnedProperties / us-gaap_StatementScenarioAxis = eqr_UnconsolidatedTotalDomain |  | 90,878,000 eqr_NoncontrollingInterestsPartiallyOwnedProperties / us-gaap_StatementScenarioAxis = eqr_UnconsolidatedTotalDomain |  |  |
Partially Owned Property Balance Sheet Schedule |  |  |  |  |  |
Number of Real Estate Properties | 3 us-gaap_NumberOfRealEstateProperties / us-gaap_StatementScenarioAxis = eqr_UnconsolidatedTotalDomain |  | 3 us-gaap_NumberOfRealEstateProperties / us-gaap_StatementScenarioAxis = eqr_UnconsolidatedTotalDomain |  |  |
Number of Units in Real Estate Property | 1,281 us-gaap_NumberOfUnitsInRealEstateProperty / us-gaap_StatementScenarioAxis = eqr_UnconsolidatedTotalDomain |  | 1,281 us-gaap_NumberOfUnitsInRealEstateProperty / us-gaap_StatementScenarioAxis = eqr_UnconsolidatedTotalDomain |  |  |
ASSETS |  |  |  |  |  |
Investment in real estate | 290,077,000 us-gaap_RealEstateInvestmentPropertyAtCost / us-gaap_StatementScenarioAxis = eqr_UnconsolidatedTotalDomain |  | 290,077,000 us-gaap_RealEstateInvestmentPropertyAtCost / us-gaap_StatementScenarioAxis = eqr_UnconsolidatedTotalDomain |  |  |
Real Estate Investment Property, Accumulated Depreciation | (21,388,000)us-gaap_RealEstateInvestmentPropertyAccumulatedDepreciation / us-gaap_StatementScenarioAxis = eqr_UnconsolidatedTotalDomain |  | (21,388,000)us-gaap_RealEstateInvestmentPropertyAccumulatedDepreciation / us-gaap_StatementScenarioAxis = eqr_UnconsolidatedTotalDomain |  |  |
Investment in real estate, net | 268,689,000 us-gaap_RealEstateInvestmentPropertyNet / us-gaap_StatementScenarioAxis = eqr_UnconsolidatedTotalDomain |  | 268,689,000 us-gaap_RealEstateInvestmentPropertyNet / us-gaap_StatementScenarioAxis = eqr_UnconsolidatedTotalDomain |  |  |
Cash and cash equivalents | 7,598,000 us-gaap_CashAndCashEquivalentsAtCarryingValue / us-gaap_StatementScenarioAxis = eqr_UnconsolidatedTotalDomain |  | 7,598,000 us-gaap_CashAndCashEquivalentsAtCarryingValue / us-gaap_StatementScenarioAxis = eqr_UnconsolidatedTotalDomain |  |  |
Investments in unconsolidated entities | 0 us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures / us-gaap_StatementScenarioAxis = eqr_UnconsolidatedTotalDomain |  | 0 us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures / us-gaap_StatementScenarioAxis = eqr_UnconsolidatedTotalDomain |  |  |
Deposits - restricted | 246,000 us-gaap_RestrictedCashAndCashEquivalents / us-gaap_StatementScenarioAxis = eqr_UnconsolidatedTotalDomain |  | 246,000 us-gaap_RestrictedCashAndCashEquivalents / us-gaap_StatementScenarioAxis = eqr_UnconsolidatedTotalDomain |  |  |
Deferred financing costs, net | 7,000 us-gaap_DeferredFinanceCostsNet / us-gaap_StatementScenarioAxis = eqr_UnconsolidatedTotalDomain |  | 7,000 us-gaap_DeferredFinanceCostsNet / us-gaap_StatementScenarioAxis = eqr_UnconsolidatedTotalDomain |  |  |
Other Assets | 1,327,000 us-gaap_OtherAssets / us-gaap_StatementScenarioAxis = eqr_UnconsolidatedTotalDomain |  | 1,327,000 us-gaap_OtherAssets / us-gaap_StatementScenarioAxis = eqr_UnconsolidatedTotalDomain |  |  |
Total assets | 277,867,000 us-gaap_Assets / us-gaap_StatementScenarioAxis = eqr_UnconsolidatedTotalDomain |  | 277,867,000 us-gaap_Assets / us-gaap_StatementScenarioAxis = eqr_UnconsolidatedTotalDomain |  |  |
LIABILITIES AND EQUITY |  |  |  |  |  |
Secured Debt | 175,276,000 us-gaap_SecuredDebt / us-gaap_StatementScenarioAxis = eqr_UnconsolidatedTotalDomain |  | 175,276,000 us-gaap_SecuredDebt / us-gaap_StatementScenarioAxis = eqr_UnconsolidatedTotalDomain |  |  |
Accounts Payable And Accrued Liabilities Current And Noncurrent Other Than Interest And Dividend Payable | 389,000 eqr_AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrentOtherThanInterestAndDividendPayable / us-gaap_StatementScenarioAxis = eqr_UnconsolidatedTotalDomain |  | 389,000 eqr_AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrentOtherThanInterestAndDividendPayable / us-gaap_StatementScenarioAxis = eqr_UnconsolidatedTotalDomain |  |  |
Accrued interest payable | 691,000 us-gaap_InterestPayableCurrentAndNoncurrent / us-gaap_StatementScenarioAxis = eqr_UnconsolidatedTotalDomain |  | 691,000 us-gaap_InterestPayableCurrentAndNoncurrent / us-gaap_StatementScenarioAxis = eqr_UnconsolidatedTotalDomain |  |  |
Other liabilities | 834,000 us-gaap_OtherLiabilities / us-gaap_StatementScenarioAxis = eqr_UnconsolidatedTotalDomain |  | 834,000 us-gaap_OtherLiabilities / us-gaap_StatementScenarioAxis = eqr_UnconsolidatedTotalDomain |  |  |
Security deposits | 531,000 us-gaap_SecurityDepositLiability / us-gaap_StatementScenarioAxis = eqr_UnconsolidatedTotalDomain |  | 531,000 us-gaap_SecurityDepositLiability / us-gaap_StatementScenarioAxis = eqr_UnconsolidatedTotalDomain |  |  |
Total liabilities | 177,721,000 us-gaap_Liabilities / us-gaap_StatementScenarioAxis = eqr_UnconsolidatedTotalDomain |  | 177,721,000 us-gaap_Liabilities / us-gaap_StatementScenarioAxis = eqr_UnconsolidatedTotalDomain |  |  |
Noncontrolling Interests - Partially Owned Properties/Partners' equity | 90,878,000 eqr_NoncontrollingInterestsPartiallyOwnedProperties / us-gaap_StatementScenarioAxis = eqr_UnconsolidatedTotalDomain |  | 90,878,000 eqr_NoncontrollingInterestsPartiallyOwnedProperties / us-gaap_StatementScenarioAxis = eqr_UnconsolidatedTotalDomain |  |  |
Company equity/General and Limited Partners' Capital | 9,268,000 eqr_ParentEquityInterest / us-gaap_StatementScenarioAxis = eqr_UnconsolidatedTotalDomain |  | 9,268,000 eqr_ParentEquityInterest / us-gaap_StatementScenarioAxis = eqr_UnconsolidatedTotalDomain |  |  |
Total equity/capital | 100,146,000 eqr_TotalEquityInterest / us-gaap_StatementScenarioAxis = eqr_UnconsolidatedTotalDomain |  | 100,146,000 eqr_TotalEquityInterest / us-gaap_StatementScenarioAxis = eqr_UnconsolidatedTotalDomain |  |  |
Total liabilities and equity | 277,867,000 us-gaap_LiabilitiesAndStockholdersEquity / us-gaap_StatementScenarioAxis = eqr_UnconsolidatedTotalDomain |  | 277,867,000 us-gaap_LiabilitiesAndStockholdersEquity / us-gaap_StatementScenarioAxis = eqr_UnconsolidatedTotalDomain |  |  |
Partially Owned Property Income Statement Schedule |  |  |  |  |  |
Operating revenue | 7,813,000 us-gaap_Revenues / us-gaap_StatementScenarioAxis = eqr_UnconsolidatedTotalDomain |  |  |  |  |
Operating expenses | 2,443,000 eqr_RealEstateOperatingExpenses / us-gaap_StatementScenarioAxis = eqr_UnconsolidatedTotalDomain |  |  |  |  |
Net operating (loss) income | 5,370,000 us-gaap_GrossProfit / us-gaap_StatementScenarioAxis = eqr_UnconsolidatedTotalDomain |  |  |  |  |
Depreciation | 3,076,000 us-gaap_Depreciation / us-gaap_StatementScenarioAxis = eqr_UnconsolidatedTotalDomain |  |  |  |  |
General and administrative/other | 56,000 us-gaap_GeneralAndAdministrativeExpense / us-gaap_StatementScenarioAxis = eqr_UnconsolidatedTotalDomain |  |  |  |  |
Operating Income | 2,238,000 us-gaap_OperatingIncomeLoss / us-gaap_StatementScenarioAxis = eqr_UnconsolidatedTotalDomain |  |  |  |  |
Interest and other income | 0 us-gaap_InterestAndOtherIncome / us-gaap_StatementScenarioAxis = eqr_UnconsolidatedTotalDomain |  |  |  |  |
Other expenses | 0 us-gaap_OtherNonoperatingIncomeExpense / us-gaap_StatementScenarioAxis = eqr_UnconsolidatedTotalDomain |  |  |  |  |
Interest: |  |  |  |  |  |
Expense incurred, net | (2,346,000)us-gaap_InterestExpenseDebt / us-gaap_StatementScenarioAxis = eqr_UnconsolidatedTotalDomain |  |  |  |  |
Amortization of deferred financing costs | (1,000)us-gaap_AmortizationOfFinancingCosts / us-gaap_StatementScenarioAxis = eqr_UnconsolidatedTotalDomain |  |  |  |  |
Income before income and other taxes, income (loss) from investments in unconsolidated entities, net gain (loss) on sales of real estate properties and land parcels and discontinued operations | (109,000)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_StatementScenarioAxis = eqr_UnconsolidatedTotalDomain |  |  |  |  |
Income and other tax (expense) benefit | (18,000)us-gaap_IncomeTaxExpenseBenefit / us-gaap_StatementScenarioAxis = eqr_UnconsolidatedTotalDomain |  |  |  |  |
Income (loss) from investments in unconsolidated entities | 0 us-gaap_IncomeLossFromEquityMethodInvestments / us-gaap_StatementScenarioAxis = eqr_UnconsolidatedTotalDomain |  |  |  |  |
Net income | (127,000)us-gaap_ProfitLoss / us-gaap_StatementScenarioAxis = eqr_UnconsolidatedTotalDomain |  |  |  |  |
Archstone Transaction [Member] |  |  |  |  |  |
Investments In Partially Owned Entities (Textuals) [Abstract] |  |  |  |  |  |
Liquidation Value Preferred Interests | 72,600,000 eqr_LiquidationValuePreferredInterests / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = eqr_ArchstoneTransactionMember |  | 72,600,000 eqr_LiquidationValuePreferredInterests / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = eqr_ArchstoneTransactionMember |  |  |
Germany [Domain] |  |  |  |  |  |
Investments In Partially Owned Entities (Textuals) [Abstract] |  |  |  |  |  |
Distributions from unconsolidated entities - return of capital | 2,000,000 eqr_ProceedsFromDistributionsReceivedFromUnconsolidatedSubsidiaries / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = eqr_GermanyDomain |  | 100,500,000 eqr_ProceedsFromDistributionsReceivedFromUnconsolidatedSubsidiaries / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = eqr_GermanyDomain |  |  |
Residual JV [Domain] |  |  |  |  |  |
Investments In Partially Owned Entities (Textuals) [Abstract] |  |  |  |  |  |
Business Acquisition, Percentage of Voting Interests Acquired | 60.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = eqr_ResidualJvDomain |  | 60.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = eqr_ResidualJvDomain |  |  |
Joint Venture Partner Ownership Percentage | 40.00%eqr_JointVenturePartnerOwnershipPercentage / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = eqr_ResidualJvDomain |  | 40.00%eqr_JointVenturePartnerOwnershipPercentage / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = eqr_ResidualJvDomain |  |  |
Investments in unconsolidated entities | 147,600,000 us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = eqr_ResidualJvDomain |  | 147,600,000 us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = eqr_ResidualJvDomain |  |  |
Distributions from unconsolidated entities - return of capital | 19,000,000 eqr_ProceedsFromDistributionsReceivedFromUnconsolidatedSubsidiaries / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = eqr_ResidualJvDomain |  |  |  |  |
ASSETS |  |  |  |  |  |
Investments in unconsolidated entities | 147,600,000 us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = eqr_ResidualJvDomain |  | 147,600,000 us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = eqr_ResidualJvDomain |  |  |
Residual JV [Domain] | Rental Properties Disposed of [Member] |  |  |  |  |  |
Investments In Partially Owned Entities (Textuals) [Abstract] |  |  |  |  |  |
Distributions from unconsolidated entities - return of capital | 10,400,000 eqr_ProceedsFromDistributionsReceivedFromUnconsolidatedSubsidiaries / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = eqr_ResidualJvDomain / us-gaap_StatementScenarioAxis = eqr_RentalPropertiesDisposedOfMember |  |  |  |  |
Residual JV [Domain] | Settled Litigation [Member] |  |  |  |  |  |
Investments In Partially Owned Entities (Textuals) [Abstract] |  |  |  |  |  |
Distributions from unconsolidated entities - return of capital | 6,600,000 eqr_ProceedsFromDistributionsReceivedFromUnconsolidatedSubsidiaries / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = eqr_ResidualJvDomain / us-gaap_StatementScenarioAxis = us-gaap_SettledLitigationMember |  |  |  |  |
Wisconsin Place [Domain] |  |  |  |  |  |
Investments In Partially Owned Entities (Textuals) [Abstract] |  |  |  |  |  |
Business Acquisition, Percentage of Voting Interests Acquired | 75.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = eqr_WisconsinPlaceDomain |  | 75.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = eqr_WisconsinPlaceDomain |  |  |
Initial Basis of Real Estate, Consolidated | 198,500,000 eqr_InitialBasisofRealEstateConsolidated / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = eqr_WisconsinPlaceDomain |  | 198,500,000 eqr_InitialBasisofRealEstateConsolidated / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = eqr_WisconsinPlaceDomain |  |  |
Investments in unconsolidated entities | 56,500,000 us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = eqr_WisconsinPlaceDomain |  | 56,500,000 us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = eqr_WisconsinPlaceDomain |  |  |
Partially Owned Property Balance Sheet Schedule |  |  |  |  |  |
Number of Units in Real Estate Property | 432 us-gaap_NumberOfUnitsInRealEstateProperty / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = eqr_WisconsinPlaceDomain |  | 432 us-gaap_NumberOfUnitsInRealEstateProperty / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = eqr_WisconsinPlaceDomain |  |  |
ASSETS |  |  |  |  |  |
Investments in unconsolidated entities | 56,500,000 us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = eqr_WisconsinPlaceDomain |  | 56,500,000 us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = eqr_WisconsinPlaceDomain |  |  |
Waterton Tenside [Domain] |  |  |  |  |  |
Investments In Partially Owned Entities (Textuals) [Abstract] |  |  |  |  |  |
Equity Method Investment, Ownership Percentage | 20.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = eqr_WatertonTensideDomain |  | 20.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = eqr_WatertonTensideDomain |  |  |
Initial Basis of Real Estate, Unconsolidated | 5,100,000 eqr_InitialBasisofRealEstateUnconsolidated / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = eqr_WatertonTensideDomain |  | 5,100,000 eqr_InitialBasisofRealEstateUnconsolidated / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = eqr_WatertonTensideDomain |  |  |
Secured Debt | 29,800,000 us-gaap_SecuredDebt / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = eqr_WatertonTensideDomain |  | 29,800,000 us-gaap_SecuredDebt / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = eqr_WatertonTensideDomain |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 3.66%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = eqr_WatertonTensideDomain |  | 3.66%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = eqr_WatertonTensideDomain |  |  |
Debt Instrument, Maturity Date | Dec. 01, 2018 |  |  |  |  |
Partially Owned Property Balance Sheet Schedule |  |  |  |  |  |
Number of Units in Real Estate Property | 336 us-gaap_NumberOfUnitsInRealEstateProperty / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = eqr_WatertonTensideDomain |  | 336 us-gaap_NumberOfUnitsInRealEstateProperty / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = eqr_WatertonTensideDomain |  |  |
LIABILITIES AND EQUITY |  |  |  |  |  |
Secured Debt | 29,800,000 us-gaap_SecuredDebt / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = eqr_WatertonTensideDomain |  | 29,800,000 us-gaap_SecuredDebt / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = eqr_WatertonTensideDomain |  |  |
Joint Venture Partner [Member] |  |  |  |  |  |
Investments In Partially Owned Entities (Textuals) [Abstract] |  |  |  |  |  |
Land purchase price | 57,900,000 eqr_LandPurchasePrice / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = eqr_JointVenturePartnerMember |  | 57,900,000 eqr_LandPurchasePrice / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = eqr_JointVenturePartnerMember |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets | 75,700,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = eqr_JointVenturePartnerMember |  | 75,700,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = eqr_JointVenturePartnerMember |  |  |
Noncontrolling Interests - Partially Owned Properties/Partners' equity | 117,400,000 eqr_NoncontrollingInterestsPartiallyOwnedProperties / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = eqr_JointVenturePartnerMember |  | 117,400,000 eqr_NoncontrollingInterestsPartiallyOwnedProperties / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = eqr_JointVenturePartnerMember |  |  |
LIABILITIES AND EQUITY |  |  |  |  |  |
Noncontrolling Interests - Partially Owned Properties/Partners' equity | 117,400,000 eqr_NoncontrollingInterestsPartiallyOwnedProperties / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = eqr_JointVenturePartnerMember |  | 117,400,000 eqr_NoncontrollingInterestsPartiallyOwnedProperties / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = eqr_JointVenturePartnerMember |  |  |
Company's Portion [Member] |  |  |  |  |  |
Investments In Partially Owned Entities (Textuals) [Abstract] |  |  |  |  |  |
Land purchase price | 76,100,000 eqr_LandPurchasePrice / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = eqr_CompanysPortionMember |  | 76,100,000 eqr_LandPurchasePrice / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = eqr_CompanysPortionMember |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets | 102,500,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = eqr_CompanysPortionMember |  | 102,500,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = eqr_CompanysPortionMember |  |  |
Nexus Sawgrass [Member] |  |  |  |  |  |
Investments In Partially Owned Entities (Textuals) [Abstract] |  |  |  |  |  |
Secured Debt | 48,600,000 us-gaap_SecuredDebt / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = eqr_NexusSawgrassMember |  | 48,600,000 us-gaap_SecuredDebt / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = eqr_NexusSawgrassMember |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 5.60%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = eqr_NexusSawgrassMember |  | 5.60%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = eqr_NexusSawgrassMember |  |  |
Debt Instrument, Maturity Date | Jan. 01, 2021 |  |  |  |  |
Project Cost | 78,600,000 eqr_ProjectCost / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = eqr_NexusSawgrassMember |  | 78,600,000 eqr_ProjectCost / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = eqr_NexusSawgrassMember |  |  |
Maximum Debt Commitment | 48,700,000 eqr_MaximumDebtCommitment / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = eqr_NexusSawgrassMember |  | 48,700,000 eqr_MaximumDebtCommitment / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = eqr_NexusSawgrassMember |  |  |
LIABILITIES AND EQUITY |  |  |  |  |  |
Secured Debt | 48,600,000 us-gaap_SecuredDebt / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = eqr_NexusSawgrassMember |  | 48,600,000 us-gaap_SecuredDebt / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = eqr_NexusSawgrassMember |  |  |
Domain [Member] |  |  |  |  |  |
Investments In Partially Owned Entities (Textuals) [Abstract] |  |  |  |  |  |
Secured Debt | 96,800,000 us-gaap_SecuredDebt / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = eqr_DomainMember |  | 96,800,000 us-gaap_SecuredDebt / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = eqr_DomainMember |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 5.75%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = eqr_DomainMember |  | 5.75%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = eqr_DomainMember |  |  |
Debt Instrument, Maturity Date | Jan. 01, 2022 |  |  |  |  |
Project Cost | 155,800,000 eqr_ProjectCost / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = eqr_DomainMember |  | 155,800,000 eqr_ProjectCost / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = eqr_DomainMember |  |  |
Maximum Debt Commitment | 98,600,000 eqr_MaximumDebtCommitment / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = eqr_DomainMember |  | 98,600,000 eqr_MaximumDebtCommitment / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = eqr_DomainMember |  |  |
LIABILITIES AND EQUITY |  |  |  |  |  |
Secured Debt | $ 96,800,000 us-gaap_SecuredDebt / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = eqr_DomainMember |  | $ 96,800,000 us-gaap_SecuredDebt / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = eqr_DomainMember |  |  |

X
- Definition Carrying value as of the balance sheet date of obligations incurred and payable pertaining to goods and services received from vendors, are incurred in connection with contractual obligations or accumulate over time and for which invoices have not yet been received or will not be rendered. + References No definition available. + Details
Name: | eqr_AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrentOtherThanInterestAndDividendPayable
Namespace Prefix: | eqr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Represents the initial basis at fair value of the Company's interests in a property acquired as part of a joint venture. The investment is consolidated. + References No definition available. + Details
Name: | eqr_InitialBasisofRealEstateConsolidated
Namespace Prefix: | eqr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Represents the initial basis at fair value of the Company's interests in a property acquired as part of a joint venture. The investment is not consolidated. + References No definition available. + Details
Name: | eqr_InitialBasisofRealEstateUnconsolidated
Namespace Prefix: | eqr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The Company's and the Joint Venture partner's total combined investment in the project. + References No definition available. + Details
Name: | eqr_InvestmentInJointVenture
Namespace Prefix: | eqr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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

X
- Definition Represents the ownership interest sold to a third party as part of the formation of a joint venture. + References No definition available. + Details
Name: | eqr_JointVenturePartnerOwnershipPercentage
Namespace Prefix: | eqr_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Represents the purchase price of land acquired in a joint venture. + References No definition available. + Details
Name: | eqr_LandPurchasePrice
Namespace Prefix: | eqr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The aggregate liquidation preference of preferred interests acquired in conjunction with the Archstone transaction. + References No definition available. + Details
Name: | eqr_LiquidationValuePreferredInterests
Namespace Prefix: | eqr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The unfunded portion of the loan that may be drawn down or is due to be contractually funded in the future. + References No definition available. + Details
Name: | eqr_MaximumDebtCommitment
Namespace Prefix: | eqr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Carrying amount of equity interests owned by noncontrolling partners in partially owned properties. + References No definition available. + Details
Name: | eqr_NoncontrollingInterestsPartiallyOwnedProperties
Namespace Prefix: | eqr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Represents the number of joint ventures that the Company is party to. + References No definition available. + Details
Name: | eqr_NumberOfJointVentures
Namespace Prefix: | eqr_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Represents the Company's equity interests in the related rental properties. + References No definition available. + Details
Name: | eqr_ParentEquityInterest
Namespace Prefix: | eqr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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

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

X
- Definition The cash inflow to the Company associated with a partner's purchase of or advances to an equity method investment, which is an investment in a joint venture or an entity. + References No definition available. + Details
Name: | eqr_PartnersPaymentsToAcquireEquityMethodInvestments
Namespace Prefix: | eqr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The cash inflow from distributions of capital received from unconsolidated joint ventures ( i.e proportionate share of proceeds and/or gain/loss from property sales). + References No definition available. + Details
Name: | eqr_ProceedsFromDistributionsReceivedFromUnconsolidatedSubsidiaries
Namespace Prefix: | eqr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents total project costs for the development of land parcels to residential apartment communities. + References No definition available. + Details
Name: | eqr_ProjectCost
Namespace Prefix: | eqr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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

X
- Definition Represents both the Company's and the joint venture partners equity interests in the related rental properties. + References No definition available. + Details
Name: | eqr_TotalEquityInterest
Namespace Prefix: | eqr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of noncash expense included in interest expense to issue debt and obtain financing associated with the related debt instruments. Alternate captions include noncash interest expense. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.8) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 8 -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 8 -Article 9 + Details
Name: | us-gaap_AmortizationOfFinancingCosts
Namespace Prefix: | us-gaap_
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
- Details
Name: | us-gaap_AssetsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of voting equity interests acquired at the acquisition date in the business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463 + Details
Name: | us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Amount of assets acquired at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=39739317&loc=d3e4845-128472 + Details
Name: | us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash -URI http://asc.fasb.org/extlink&oid=6506951 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 1 -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=28358313&loc=d3e6676-107765 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3044-108585 + Details
Name: | us-gaap_CashAndCashEquivalentsAtCarryingValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(2)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_DebtInstrumentMaturityDate
Namespace Prefix: | us-gaap_
Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration

X
- Definition For an unclassified balance sheet, the carrying amount (net of accumulated amortization) as of the balance sheet date of capitalized costs associated with the issuance of debt instruments (for example, legal, accounting, underwriting, printing, and registration costs) that will be charged against earnings over the life of the debt instruments to which such costs pertain. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28555-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.17) -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 02 -Paragraph 17 -Article 5 + Details
Name: | us-gaap_DeferredFinanceCostsNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
Name: | us-gaap_Depreciation
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- 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
Name: | us-gaap_EquityMethodInvestmentOwnershipPercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition The aggregate total of expenses of managing and administering the affairs of an entity, including affiliates of the reporting entity, which are not directly or indirectly associated with the manufacture, sale or creation of a product or product line. + 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 210.5-03.4) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
Name: | us-gaap_GeneralAndAdministrativeExpense
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Aggregate revenue less cost of goods and services sold or operating expenses directly attributable to the revenue generation activity. + 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 210.5-03.1,2) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
Name: | us-gaap_GrossProfit
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Sum of operating profit and nonoperating income or expense before Income or Loss from equity method investments, income taxes, extraordinary items, and noncontrolling interest. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)(1)(i)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
Name: | us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition This item represents the entity's proportionate share for the period of the net income (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. This item includes income or expense related to stock-based compensation based on the investor's grant of stock to employees of an equity method investee. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 9 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35755396&loc=d3e33749-111570 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.12) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 11 -Article 7 + Details
Name: | us-gaap_IncomeLossFromEquityMethodInvestments
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Article 4 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Income Tax Expense (or Benefit) -URI http://asc.fasb.org/extlink&oid=6515339 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32639-109319 + Details
Name: | us-gaap_IncomeTaxExpenseBenefit
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The amount of interest income and other income recognized during the period. Included in this element is interest derived from investments in debt securities, cash and cash equivalents, and other investments which reflect the time value of money or transactions in which the payments are for the use or forbearance of money and other income from ancillary business-related activities (that is, excluding major activities considered part of the normal operations of the business). + References No definition available. + Details
Name: | us-gaap_InterestAndOtherIncome
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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

X
- Definition Amount of the cost of borrowed funds accounted for as interest expense for debt. + 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 210.5-03.8) -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 8 -Article 5 + Details
Name: | us-gaap_InterestExpenseDebt
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of interest payable on debt, including, but not limited to, trade payables. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.15(5)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.15(a)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 15 -Subparagraph a -Article 7 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 15 -Subparagraph 5 -Article 9 + Details
Name: | us-gaap_InterestPayableCurrentAndNoncurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Total investments in (A) an entity in which the entity has significant influence, but does not have control, (B) subsidiaries that are not required to be consolidated and are accounted for using the equity and or cost method, and (C) an entity in which the reporting entity shares control of the entity with another party or group. Includes long-term advances receivable from a party that is affiliated with the reporting entity by means of direct or indirect ownership. + 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 210.5-02.12) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Sum of the carrying amounts as of the balance sheet date of all liabilities that are recognized. Liabilities are probable future sacrifices of economic benefits arising from present obligations of an entity to transfer assets or provide services to other entities in the future. + 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 210.5-02.19-26) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_Liabilities
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of liabilities and equity items, including the portion of equity attributable to noncontrolling interests, if any. + 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 210.5-02.32) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 25 -Article 7 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 32 -Article 5 + Details
Name: | us-gaap_LiabilitiesAndStockholdersEquity
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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

X
- Definition The number of real estate properties owned as of the balance sheet date. + References No definition available. + Details
Name: | us-gaap_NumberOfRealEstateProperties
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition The number of units in a real estate property owned as of the balance sheet date. + References No definition available. + Details
Name: | us-gaap_NumberOfUnitsInRealEstateProperty
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition The net result for the period of deducting operating expenses from operating revenues. + References No definition available. + Details
Name: | us-gaap_OperatingIncomeLoss
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The aggregate carrying amounts, as of the balance sheet date, of assets not separately disclosed in the balance sheet. + 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 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 17 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 10 -Article 7 + Details
Name: | us-gaap_OtherAssets
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The aggregate carrying amount, as of the balance sheet date, of liabilities not separately disclosed in the balance sheet. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 15 -Article 9 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.15) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
Name: | us-gaap_OtherLiabilities
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The net amount of other income and expense amounts, the components of which are not separately disclosed on the income statement, resulting from ancillary business-related activities (that is, excluding major activities considered part of the normal operations of the business) also known as other nonoperating income (expense) recognized for the period. Such amounts may include: (a) dividends, (b) interest on securities, (c) net gains or losses on securities, (d) unusual costs, (e) gains or losses on foreign exchange transactions, and (f) miscellaneous other income and expense items. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 9 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.9) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
Name: | us-gaap_OtherNonoperatingIncomeExpense
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 55 -Paragraph 4K -URI http://asc.fasb.org/extlink&oid=35736750&loc=SL4591552-111686 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 19 -URI http://asc.fasb.org/extlink&oid=7656940&loc=SL4569616-111683 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (a),(c) -URI http://asc.fasb.org/extlink&oid=18733093&loc=SL4573702-111684 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 55 -Paragraph 4J -URI http://asc.fasb.org/extlink&oid=35736750&loc=SL4591551-111686 + Details
Name: | us-gaap_ProfitLoss
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The cumulative amount of depreciation for real estate property held for investment 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(3)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 7 + Details
Name: | us-gaap_RealEstateInvestmentPropertyAccumulatedDepreciation
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of real estate investment property which may include the following: (1) land available-for-sale; (2) land available-for-development; (3) investments in building and building improvements; (4) tenant allowances; (5) developments in-process; (6) rental properties; and (7) other real estate investments. + 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
Name: | us-gaap_RealEstateInvestmentPropertyAtCost
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of real estate investment property, net of accumulated depreciation, which may include the following: (1) land available-for-sale; (2) land available-for-development; (3) investments in building and building improvements; (4) tenant allowances; (5) developments in-process; (6) rental properties; and (7) other real estate investments. + 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
Name: | us-gaap_RealEstateInvestmentPropertyNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The carrying amounts of cash and cash equivalent items which are restricted as to withdrawal or usage. Restrictions may include legally restricted deposits held as compensating balances against borrowing arrangements, contracts entered into with others, or entity statements of intention with regard to particular deposits; however, time deposits and short-term certificates of deposit are not generally included in legally restricted deposits. Excludes compensating balance arrangements that are not agreements which legally restrict the use of cash amounts shown on the balance sheet. This element is for unclassified presentations; for classified presentations there is a separate and distinct element. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 1 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_RestrictedCashAndCashEquivalents
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss). + 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) -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
Name: | us-gaap_Revenues
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Carrying value as of the balance sheet date, including the current and noncurrent portions, of collateralized debt obligations (with maturities initially due after one year or beyond the operating cycle, if longer). Such obligations include mortgage loans, chattel loans, and any other borrowings secured by assets of the borrower. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20, 22 -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
Name: | us-gaap_SecuredDebt
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition This element represents money paid in advance to protect the provider of a product or service, such as a lessor, against damage or nonpayment by the buyer or tenant (lessee) during the term of the agreement. Such damages may include physical damage to the property, theft of property, and other contractual breaches. Security deposits held may be interest or noninterest bearing. + 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 210.7-03.15(a)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
Name: | us-gaap_SecurityDepositLiability
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis=eqr_ArchstoneTransactionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis=eqr_CompanysPortionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis=eqr_DomainMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis=eqr_GermanyDomain
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis=eqr_JointVenturePartnerMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis=eqr_NexusSawgrassMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis=eqr_ResidualJvDomain
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis=eqr_WatertonTensideDomain
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis=eqr_WisconsinPlaceDomain
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

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

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

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

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