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Derivative and Other Fair Value Instruments (Details) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2014
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Fair Value Hedging maturity date 2019 [Member] |
Derivative [Line Items] |
Current Notional Balance | $ 450,000
Lowest Possible Notional | 450,000
Highest Possible Notional | 450,000
Lowest Interest Rate | 2.375%
Highest Interest Rate | 2.375%
Forward Starting Swaps Fair Value Hedging maturity date 2025 [Member] |
Derivative [Line Items] |
Current Notional Balance | 200,000
Lowest Possible Notional | 200,000
Highest Possible Notional | $ 200,000
Lowest Interest Rate | 2.689%
Highest Interest Rate | 3.191%

X
- Definition Highest possible notional amount of all derivatives designated as fair value or cash flow hedging instruments. The notional amount relates to a number of currency units, shares, bushels, pounds or other units specified in a derivative instrument. + References No definition available. + Details
Name: | eqr_HighestPossibleNotional
Namespace Prefix: | eqr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Lowest possible notional amount of all derivatives designated as fair value or cash flow hedging instruments. The notional amount relates to a number of currency units, shares, bushels, pounds or other units specified in a derivative instrument. + References No definition available. + Details
Name: | eqr_LowestPossibleNotional
Namespace Prefix: | eqr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- 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
Name: | invest_DerivativeNotionalAmount
Namespace Prefix: | invest_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | instant

X
- Definition High end of the range of fixed interest rates when a range is presented for a group of interest rate derivatives. + References No definition available. + Details
Name: | us-gaap_DerivativeHigherFixedInterestRateRange
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | us-gaap_DerivativeLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Low end of the range of fixed interest rates when a range is presented for a group of interest rate derivatives. + References No definition available. + Details
Name: | us-gaap_DerivativeLowerFixedInterestRateRange
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant