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Derivative and Other Fair Value Instruments - Summary of Consolidated Derivative Instruments (Details) - Fair Value Hedges [Member] | 3 Months Ended
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Mar. 31, 2017 USD ($)
Derivative [Line Items] |
Current Notional Balance | $ 450,000,000
Indictative Interest Rate | 2.375%
Maturity Date | 2019

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- Definition Maturity date, derivative. + References No definition available. + Details
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Namespace Prefix: | eqr_
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Balance Type: | na
Period Type: | duration

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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Balance Type: | na
Period Type: | instant

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- Definition Fixed interest rate related to the interest rate derivative. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Balance Type: | na
Period Type: | duration

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- Details
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Balance Type: |
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