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Equity, Capital and Other Interests Text (Details) (USD $) | Mar. 31, 2015 | Dec. 31, 2014
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Preferred Stock, Shares Authorized | 100,000,000 us-gaap_PreferredStockSharesAuthorized | 100,000,000 us-gaap_PreferredStockSharesAuthorized
Preferred Stock, Par or Stated Value Per Share | $ 0.01 us-gaap_PreferredStockParOrStatedValuePerShare | $ 0.01 us-gaap_PreferredStockParOrStatedValuePerShare
Additional Common Shares Authorized | 13,000,000 eqr_AdditionalCommonSharesAuthorized |
Stock Repurchase Program, Number of Shares Authorized to be Repurchased | 13,000,000 us-gaap_StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased |
Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased | 12,968,760 us-gaap_StockRepurchaseProgramRemainingNumberOfSharesAuthorizedToBeRepurchased |

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- Definition Represents the remaining number of shares to be issued into the existing trading market at current market prices as well as through negotiated transactions under the Company's at-the-market share offering program. + References No definition available. + Details
Name: | eqr_AdditionalCommonSharesAuthorized
Namespace Prefix: | eqr_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

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- Definition Face amount or stated value per share of preferred stock nonredeemable or redeemable solely at the option of the issuer. + 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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Namespace Prefix: | us-gaap_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | instant

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- Definition The maximum number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) permitted to be issued by an entity's charter and bylaws. + 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
Name: | us-gaap_PreferredStockSharesAuthorized
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

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- Definition The number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

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- Definition The remaining number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant