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Equity, Capital and Other Interests Preferred (Details) (USD $) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2015 | Mar. 31, 2014 | Dec. 31, 2014
Class of Stock [Line Items] |  |  |
Preferred Shares of beneficial interest, $0.01 par value; 100,000,000 shares authorized; 803,600 shares issued and outstanding as of March 31, 2015 and 1,000,000 shares issued and outstanding as of December 31, 2014 | $ 40,180,000 us-gaap_PreferredStockValueOutstanding |  | $ 50,000,000 us-gaap_PreferredStockValueOutstanding
Partial redemption of 8.29% Series K Cumulative Redeemable | 9,820,000 us-gaap_TreasuryStockValueAcquiredParValueMethod | 0 us-gaap_TreasuryStockValueAcquiredParValueMethod |
Redemption Premium | 2,789,000 us-gaap_RedemptionPremium | 0 us-gaap_RedemptionPremium |
OPERATING PARTNERSHIP |  |  |
Class of Stock [Line Items] |  |  |
Partial redemption of 8.29% Series K Cumulative Redeemable | 9,820,000 us-gaap_TreasuryStockValueAcquiredParValueMethod / dei_LegalEntityAxis = us-gaap_PartnershipInterestMember | 0 us-gaap_TreasuryStockValueAcquiredParValueMethod / dei_LegalEntityAxis = us-gaap_PartnershipInterestMember |
Redemption Premium | (2,789,000)us-gaap_RedemptionPremium / dei_LegalEntityAxis = us-gaap_PartnershipInterestMember | 0 us-gaap_RedemptionPremium / dei_LegalEntityAxis = us-gaap_PartnershipInterestMember |
Preferred Units | 40,180,000 us-gaap_PreferredUnitsPreferredPartnersCapitalAccounts / dei_LegalEntityAxis = us-gaap_PartnershipInterestMember |  | 50,000,000 us-gaap_PreferredUnitsPreferredPartnersCapitalAccounts / dei_LegalEntityAxis = us-gaap_PartnershipInterestMember
Series K Preferred Stock [Member] |  |  |
Class of Stock [Line Items] |  |  |
Preferred Stock Preference Units Dividend Rate Percentage | 8.29%eqr_PreferredStockPreferenceUnitsDividendRatePercentage / us-gaap_StatementClassOfStockAxis = eqr_SeriesKPreferredStockMember |  | 8.29%eqr_PreferredStockPreferenceUnitsDividendRatePercentage / us-gaap_StatementClassOfStockAxis = eqr_SeriesKPreferredStockMember
Preferred Stock Preference Units Redemption Price Per Share Unit | $ 50.00 eqr_PreferredStockPreferenceUnitsRedemptionPricePerShareUnit / us-gaap_StatementClassOfStockAxis = eqr_SeriesKPreferredStockMember |  | $ 50.00 eqr_PreferredStockPreferenceUnitsRedemptionPricePerShareUnit / us-gaap_StatementClassOfStockAxis = eqr_SeriesKPreferredStockMember
Preferred Stock Preference Units Issued | 803,600 eqr_PreferredStockPreferenceUnitsIssued / us-gaap_StatementClassOfStockAxis = eqr_SeriesKPreferredStockMember |  | 1,000,000 eqr_PreferredStockPreferenceUnitsIssued / us-gaap_StatementClassOfStockAxis = eqr_SeriesKPreferredStockMember
Preferred Stock Preference Units Outstanding | 803,600 eqr_PreferredStockPreferenceUnitsOutstanding / us-gaap_StatementClassOfStockAxis = eqr_SeriesKPreferredStockMember |  | 1,000,000 eqr_PreferredStockPreferenceUnitsOutstanding / us-gaap_StatementClassOfStockAxis = eqr_SeriesKPreferredStockMember
Preferred Stocks Preference Units Redemption Date | Dec. 10, 2026 |  |
Annual Dividend Per Preferred Share Preference Unit | $ 4.145 eqr_AnnualDividendPerPreferredSharePreferenceUnit / us-gaap_StatementClassOfStockAxis = eqr_SeriesKPreferredStockMember |  |
Preferred Shares of beneficial interest, $0.01 par value; 100,000,000 shares authorized; 803,600 shares issued and outstanding as of March 31, 2015 and 1,000,000 shares issued and outstanding as of December 31, 2014 | 40,180,000 us-gaap_PreferredStockValueOutstanding / us-gaap_StatementClassOfStockAxis = eqr_SeriesKPreferredStockMember |  | 50,000,000 us-gaap_PreferredStockValueOutstanding / us-gaap_StatementClassOfStockAxis = eqr_SeriesKPreferredStockMember
Preferred Stock Preference Units Repurchased and Retired | 196,400 us-gaap_TreasuryStockSharesRetired / us-gaap_StatementClassOfStockAxis = eqr_SeriesKPreferredStockMember |  |
Partial redemption of 8.29% Series K Cumulative Redeemable | 9,820,000 us-gaap_TreasuryStockValueAcquiredParValueMethod / us-gaap_StatementClassOfStockAxis = eqr_SeriesKPreferredStockMember |  |
Payments For Repurchase Of Preference Units | 12,700,000 us-gaap_TreasuryStockRetiredParValueMethodAmount / us-gaap_StatementClassOfStockAxis = eqr_SeriesKPreferredStockMember |  |
Redemption Premium | 2,789,000 us-gaap_RedemptionPremium / us-gaap_StatementClassOfStockAxis = eqr_SeriesKPreferredStockMember |  |
Series K Preferred Stock [Member] | OPERATING PARTNERSHIP |  |  |
Class of Stock [Line Items] |  |  |
Preferred Stock Preference Units Dividend Rate Percentage | 8.29%eqr_PreferredStockPreferenceUnitsDividendRatePercentage / dei_LegalEntityAxis = us-gaap_PartnershipInterestMember / us-gaap_StatementClassOfStockAxis = eqr_SeriesKPreferredStockMember |  | 8.29%eqr_PreferredStockPreferenceUnitsDividendRatePercentage / dei_LegalEntityAxis = us-gaap_PartnershipInterestMember / us-gaap_StatementClassOfStockAxis = eqr_SeriesKPreferredStockMember
Preferred Stock Preference Units Redemption Price Per Share Unit | $ 50.00 eqr_PreferredStockPreferenceUnitsRedemptionPricePerShareUnit / dei_LegalEntityAxis = us-gaap_PartnershipInterestMember / us-gaap_StatementClassOfStockAxis = eqr_SeriesKPreferredStockMember |  | $ 50.00 eqr_PreferredStockPreferenceUnitsRedemptionPricePerShareUnit / dei_LegalEntityAxis = us-gaap_PartnershipInterestMember / us-gaap_StatementClassOfStockAxis = eqr_SeriesKPreferredStockMember
Preferred Stock Preference Units Issued | 803,600 eqr_PreferredStockPreferenceUnitsIssued / dei_LegalEntityAxis = us-gaap_PartnershipInterestMember / us-gaap_StatementClassOfStockAxis = eqr_SeriesKPreferredStockMember |  | 1,000,000 eqr_PreferredStockPreferenceUnitsIssued / dei_LegalEntityAxis = us-gaap_PartnershipInterestMember / us-gaap_StatementClassOfStockAxis = eqr_SeriesKPreferredStockMember
Preferred Stock Preference Units Outstanding | 803,600 eqr_PreferredStockPreferenceUnitsOutstanding / dei_LegalEntityAxis = us-gaap_PartnershipInterestMember / us-gaap_StatementClassOfStockAxis = eqr_SeriesKPreferredStockMember |  | 1,000,000 eqr_PreferredStockPreferenceUnitsOutstanding / dei_LegalEntityAxis = us-gaap_PartnershipInterestMember / us-gaap_StatementClassOfStockAxis = eqr_SeriesKPreferredStockMember
Preferred Stocks Preference Units Redemption Date | Dec. 10, 2026 |  |
Annual Dividend Per Preferred Share Preference Unit | $ 4.145 eqr_AnnualDividendPerPreferredSharePreferenceUnit / dei_LegalEntityAxis = us-gaap_PartnershipInterestMember / us-gaap_StatementClassOfStockAxis = eqr_SeriesKPreferredStockMember |  |
Preferred Units | $ 40,180,000 us-gaap_PreferredUnitsPreferredPartnersCapitalAccounts / dei_LegalEntityAxis = us-gaap_PartnershipInterestMember / us-gaap_StatementClassOfStockAxis = eqr_SeriesKPreferredStockMember |  | $ 50,000,000 us-gaap_PreferredUnitsPreferredPartnersCapitalAccounts / dei_LegalEntityAxis = us-gaap_PartnershipInterestMember / us-gaap_StatementClassOfStockAxis = eqr_SeriesKPreferredStockMember

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- Definition Total number of preferred shares/preference units issued to security holders. May be all or portion of the number of preferred shares/preference units authorized. Excludes preferred shares/preference units that are classified as debt. + References No definition available. + Details
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- Definition The price per share/unit at which the preferred share/preference units of the entity has priority over common shares/units in the distribution of dividends and in the event of liquidation of the entity is redeemed or may be called at. The redemption features of these preferred shares/units are solely within the control of the issuer. + References No definition available. + Details
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- Definition Value of all nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) held by shareholders, which is net of related treasury stock. May be all or a portion of the number of preferred shares authorized. These shares represent the ownership interest of the preferred shareholders. + 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 210.5-02.28) -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 29 -Article 5 + Details
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- Definition The excess of the (1) fair value of consideration transferred to the holders of a security in excess of (2) the carrying amount of the security reported on the registrant's balance sheet, which will be deducted from net earnings to derive net earnings available to common shareholders. This amount is generally an adjustment considered in the computation of earnings per share. + References No definition available. + Details
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