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Distribution Reinvestment and Share Purchase Plan (Details) | 12 Months Ended
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Dec. 31, 2014
Common Shares registered with Distribution Reinvestment and Share Purchase Plan (2011 DRIP) | 4,850,000 eqr_StockRegisteredDuringPeriodSharesDividendReinvestmentPlan
Number of shares available for issuance | 4,786,788 eqr_NumberOfSharesAvailableForIssuance
Distribution Reinvestment Plan 2014 [Member] |
Stock Issued During Period, Shares, Dividend Reinvestment Plan | 4,790,000 us-gaap_StockIssuedDuringPeriodSharesDividendReinvestmentPlan / us-gaap_PlanNameAxis = eqr_DistributionReinvestmentPlan2014Member
Number of shares available for issuance | 4,790,000 eqr_NumberOfSharesAvailableForIssuance / us-gaap_PlanNameAxis = eqr_DistributionReinvestmentPlan2014Member

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- Definition Represents the number of shares available for issuance under the company's dividend reinvestment plan at the balance sheet date. + References No definition available. + Details
Name: | eqr_NumberOfSharesAvailableForIssuance
Namespace Prefix: | eqr_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

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- Definition Represents the number of shares authorized for issuance under the company's dividend reinvestment plan at the registration date. + References No definition available. + Details
Name: | eqr_StockRegisteredDuringPeriodSharesDividendReinvestmentPlan
Namespace Prefix: | eqr_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

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- Definition Number of shares issued during the period from a dividend reinvestment plan (DRIP). A dividend reinvestment plan allows the shareholders to reinvest dividends paid to them by the entity on new issues of stock by the entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 + Details
Name: | us-gaap_StockIssuedDuringPeriodSharesDividendReinvestmentPlan
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_PlanNameAxis=eqr_DistributionReinvestmentPlan2014Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |