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v2.4.1.9

Debt Mortgage Notes Payable (Details) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Debt Instrument [Line Items] |  |  |
Debt Instrument, Interest Rate, Stated Percentage Rate Range, Minimum | 0.03%us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMinimum | 0.03%us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMinimum |
Debt Instrument, Interest Rate, Stated Percentage Rate Range, Maximum | 7.25%us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMaximum | 7.25%us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMaximum |
Weighted Average Mortgage Debt Interest Rate | 4.21%eqr_WeightedAverageMortgageDebtInterestRate | 4.23%eqr_WeightedAverageMortgageDebtInterestRate |
Debt Instrument, Maturity Date |  | Sep. 01, 2014 |
Mortgage notes payable | $ 5,086,515,000 us-gaap_SecuredDebt | $ 5,174,166,000 us-gaap_SecuredDebt |
Repayments of Long-term Debt | 100,700,000 us-gaap_RepaymentsOfLongTermDebt |  |
Assumed mortgage debt | 28,900,000 us-gaap_NoncashOrPartNoncashAcquisitionDebtAssumed1 | 34,100,000 us-gaap_NoncashOrPartNoncashAcquisitionDebtAssumed1 |
Properties Collateralized |  | 1 eqr_PropertiesCollateralized |
Mark-to-Market Debt Premiums |  | 127,900,000 eqr_MarkToMarketDebtPremiums |
Proceeds from Issuance of Long-term Debt | 0 us-gaap_ProceedsFromIssuanceOfLongTermDebt | 902,886,000 us-gaap_ProceedsFromIssuanceOfLongTermDebt | 26,495,000 us-gaap_ProceedsFromIssuanceOfLongTermDebt
Write-off of unamortized deferred financing costs |  | 7,400,000 eqr_UnamortizedDeferredFinancingCostsWrittenOff |
Repayments Of Mortgage Notes Payable | 11,869,000 eqr_RepaymentsOfMortgageNotesPayable | 12,658,000 eqr_RepaymentsOfMortgageNotesPayable | 14,088,000 eqr_RepaymentsOfMortgageNotesPayable
Prepayment Penalty Charges | 300,000 eqr_PrepaymentPenaltyCharges | 222,400,000 eqr_PrepaymentPenaltyCharges |
Write off unamortized (premium) discount | 1,900,000 eqr_WriteOffUnamortizedPremiumDiscount | (110,500,000)eqr_WriteOffUnamortizedPremiumDiscount |
Historical cost, net of accumulated depreciation, of encumbered properties | 6,900,000,000 eqr_HistoricalCostOfEncumberedProperties | 7,300,000,000 eqr_HistoricalCostOfEncumberedProperties |
New York Life Loan [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 4.21%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_InvestmentTypeAxis = eqr_NewYorkLifeLoanMember |
Debt Instrument, Maturity Date |  | Nov. 10, 2023 |
Proceeds from Issuance of Long-term Debt |  | 800,000,000 us-gaap_ProceedsFromIssuanceOfLongTermDebt / us-gaap_InvestmentTypeAxis = eqr_NewYorkLifeLoanMember |
London Interbank Offered Rate (LIBOR) [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt Instrument, Description of Variable Rate Basis |  | LIBOR plus 1.75% |
Credit enhanced debt [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Mortgage notes payable | 700,500,000 us-gaap_SecuredDebt / us-gaap_LongtermDebtTypeAxis = eqr_CreditEnhancedDebtMember | 700,500,000 us-gaap_SecuredDebt / us-gaap_LongtermDebtTypeAxis = eqr_CreditEnhancedDebtMember |
Secured Debt [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Repayments Of Mortgage Notes Payable |  | 2,500,000,000 eqr_RepaymentsOfMortgageNotesPayable / us-gaap_DebtInstrumentAxis = us-gaap_SecuredDebtMember |
Other Debt Obligations [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt Instrument, Interest Rate, Stated Percentage Rate Range, Minimum |  | 0.10%us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMinimum / us-gaap_DebtInstrumentAxis = us-gaap_OtherDebtSecuritiesMember |
Debt Instrument, Interest Rate, Stated Percentage Rate Range, Maximum |  | 5.24%us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMaximum / us-gaap_DebtInstrumentAxis = us-gaap_OtherDebtSecuritiesMember |
Debt Instrument, Maturity Date | May 01, 2061 | May 01, 2061 |
Assumed mortgage debt |  | 339,000,000 us-gaap_NoncashOrPartNoncashAcquisitionDebtAssumed1 / us-gaap_DebtInstrumentAxis = us-gaap_OtherDebtSecuritiesMember |
Properties Collateralized |  | 3 eqr_PropertiesCollateralized / us-gaap_DebtInstrumentAxis = us-gaap_OtherDebtSecuritiesMember |
Fannie Mae Pool 3 And 4 [Domain] |  |  |
Debt Instrument [Line Items] |  |  |
Assumed mortgage debt |  | 2,200,000,000 us-gaap_NoncashOrPartNoncashAcquisitionDebtAssumed1 / us-gaap_LineOfCreditFacilityAxis = eqr_FannieMaePool3And4Domain |
Write off unamortized (premium) discount |  | 113,600,000 eqr_WriteOffUnamortizedPremiumDiscount / us-gaap_LineOfCreditFacilityAxis = eqr_FannieMaePool3And4Domain |
Fannie Mae Pool 3 [Domain] |  |  |
Debt Instrument [Line Items] |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 6.256%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LineOfCreditFacilityAxis = eqr_FannieMaePool3Domain |
Debt Instrument, Maturity Date |  | Nov. 01, 2017 |
Assumed mortgage debt |  | 1,200,000,000 us-gaap_NoncashOrPartNoncashAcquisitionDebtAssumed1 / us-gaap_LineOfCreditFacilityAxis = eqr_FannieMaePool3Domain |
Properties Collateralized |  | 16 eqr_PropertiesCollateralized / us-gaap_LineOfCreditFacilityAxis = eqr_FannieMaePool3Domain |
Fannie Mae Pool 3 [Domain] | Secured Debt [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Repayments Of Mortgage Notes Payable |  | 825,000,000 eqr_RepaymentsOfMortgageNotesPayable / us-gaap_DebtInstrumentAxis = us-gaap_SecuredDebtMember / us-gaap_LineOfCreditFacilityAxis = eqr_FannieMaePool3Domain |
Fannie Mae Pool 4 [Domain] |  |  |
Debt Instrument [Line Items] |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 5.883%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LineOfCreditFacilityAxis = eqr_FannieMaePool4Domain |
Debt Instrument, Maturity Date |  | Nov. 01, 2014 |
Assumed mortgage debt |  | 963,500,000 us-gaap_NoncashOrPartNoncashAcquisitionDebtAssumed1 / us-gaap_LineOfCreditFacilityAxis = eqr_FannieMaePool4Domain |
Properties Collateralized |  | 15 eqr_PropertiesCollateralized / us-gaap_LineOfCreditFacilityAxis = eqr_FannieMaePool4Domain |
Fannie Mae Pool 4 [Domain] | Secured Debt [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Repayments Of Mortgage Notes Payable |  | 963,500,000 eqr_RepaymentsOfMortgageNotesPayable / us-gaap_DebtInstrumentAxis = us-gaap_SecuredDebtMember / us-gaap_LineOfCreditFacilityAxis = eqr_FannieMaePool4Domain |
Nontaxable Municipal Bonds [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt Instrument, Maturity Date |  | Nov. 15, 2036 |
Assumed mortgage debt |  | $ 346,600,000 us-gaap_NoncashOrPartNoncashAcquisitionDebtAssumed1 / us-gaap_LineOfCreditFacilityAxis = us-gaap_NontaxableMunicipalBondsMember |
Properties Collateralized |  | 4 eqr_PropertiesCollateralized / us-gaap_LineOfCreditFacilityAxis = us-gaap_NontaxableMunicipalBondsMember |
Nontaxable Municipal Bonds [Member] | Minimum [Member] | SIFMA [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt Instrument, Description of Variable Rate Basis |  | SIFMA plus 0.860% |
Nontaxable Municipal Bonds [Member] | Maximum [Member] | SIFMA [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt Instrument, Description of Variable Rate Basis |  | SIFMA plus 1.402% |

X
- Definition Represents a total which may include the following: land available-for-development, investments in building and building improvements, developments-in-process, and furniture and fixtures for properties that are encumbered by mortgages. + References No definition available. + Details
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Namespace Prefix: | eqr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Represents the net premium/discount recorded as a result of the Company's mark-to-market calculation to determine fair value debt assumed in conjunction with an acquisition. + References No definition available. + Details
Name: | eqr_MarkToMarketDebtPremiums
Namespace Prefix: | eqr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Represents charges to interest expense related to the extinguishment of borrowing before maturity. + References No definition available. + Details
Name: | eqr_PrepaymentPenaltyCharges
Namespace Prefix: | eqr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Number of properties collateralizing loans assumed from an acquisition. + References No definition available. + Details
Name: | eqr_PropertiesCollateralized
Namespace Prefix: | eqr_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition The cash outflow to repay long-term debt that is wholly or partially secured by collateral. + References No definition available. + Details
Name: | eqr_RepaymentsOfMortgageNotesPayable
Namespace Prefix: | eqr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Write-off of amounts previously capitalized as debt issuance costs as part of an extinguishment of debt. + References No definition available. + Details
Name: | eqr_UnamortizedDeferredFinancingCostsWrittenOff
Namespace Prefix: | eqr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The weighted average interest rate on total mortgage debt for the period. + References No definition available. + Details
Name: | eqr_WeightedAverageMortgageDebtInterestRate
Namespace Prefix: | eqr_
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Balance Type: | na
Period Type: | duration

X
- Definition The charge to earnings for the amount of debt discount that was originally recognized at the issuance of the instrument that has yet to be amortized in conjunction with early debt extinguishment. + References No definition available. + Details
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Namespace Prefix: | eqr_
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Balance Type: | debit
Period Type: | duration

X
- Definition The reference rate for the variable rate of the debt instrument, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
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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
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Namespace Prefix: | us-gaap_
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X
- Definition Maximum 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
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- Definition Minimum 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)(2)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Details
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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
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Balance Type: | na
Period Type: | duration

X
- Definition The amount of debt that an Entity assumes in acquiring a business or in consideration for an asset received in a noncash (or part noncash) acquisition. Noncash is defined as transactions during a period that affect recognized assets or liabilities but that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4332-108586 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4313-108586 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586 + Details
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- Definition The cash inflow from a debt initially having maturity due after one year or beyond the operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585 + Details
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- Definition The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + Details
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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
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- Details
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- Details
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- Details
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- Details
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- Details
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- Details
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- Details
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