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v2.4.1.9

Derivative and Other Fair Value Instruments (Details) (USD $) | 12 Months Ended
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Dec. 31, 2014
Forward Starting Swaps [Member] |
Derivative [Line Items] |
Current Notional Balance | $ 400,000,000 eqr_NotionalAmountOfHedgeInstruments / us-gaap_DerivativeByNatureAxis = eqr_ForwardStartingSwapsMember
Lowest Possible Notional | 400,000,000 eqr_LowestPossibleNotional / us-gaap_DerivativeByNatureAxis = eqr_ForwardStartingSwapsMember
Highest Possible Notional | 400,000,000 eqr_HighestPossibleNotional / us-gaap_DerivativeByNatureAxis = eqr_ForwardStartingSwapsMember
Lowest Interest Rate | 2.274%eqr_LowestInterestRate / us-gaap_DerivativeByNatureAxis = eqr_ForwardStartingSwapsMember
Highest Interest Rate | 3.191%eqr_HighestInterestRate / us-gaap_DerivativeByNatureAxis = eqr_ForwardStartingSwapsMember
Earliest Maturity Date | 2025
Latest Maturity Date | 2025
Fair Value Hedging [Member] |
Derivative [Line Items] |
Current Notional Balance | 450,000,000 eqr_NotionalAmountOfHedgeInstruments / us-gaap_DerivativeByNatureAxis = us-gaap_FairValueHedgingMember
Lowest Possible Notional | 450,000,000 eqr_LowestPossibleNotional / us-gaap_DerivativeByNatureAxis = us-gaap_FairValueHedgingMember
Highest Possible Notional | 450,000,000 eqr_HighestPossibleNotional / us-gaap_DerivativeByNatureAxis = us-gaap_FairValueHedgingMember
Lowest Interest Rate | 2.375%eqr_LowestInterestRate / us-gaap_DerivativeByNatureAxis = us-gaap_FairValueHedgingMember
Highest Interest Rate | 2.375%eqr_HighestInterestRate / us-gaap_DerivativeByNatureAxis = us-gaap_FairValueHedgingMember
Earliest Maturity Date | 2019
Latest Maturity Date | 2019
2.375% Notes [Member] |
Derivative [Line Items] |
Term Loan Principal Amount | $ 450,000,000 eqr_TermLoanPrincipalAmount / us-gaap_LongtermDebtTypeAxis = eqr_A2.375NotesMember
Debt Instrument, Interest Rate, Stated Percentage | 2.375%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = eqr_A2.375NotesMember
Term Loan Facility Spread | 0.61%eqr_TermLoanFacilitySpread / us-gaap_LongtermDebtTypeAxis = eqr_A2.375NotesMember

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- Definition The earliest maturity date on derivatives designated as fair value or cash flow hedging instruments. + References No definition available. + Details
Name: | eqr_EarliestMaturityDate
Namespace Prefix: | eqr_
Data Type: | us-types:dateStringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Highest interest rate on derivatives designated as fair value or cash flow hedging instruments. + References No definition available. + Details
Name: | eqr_HighestInterestRate
Namespace Prefix: | eqr_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- 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 The latest maturity date on derivatives designated as fair value or cash flow hedging instruments. + References No definition available. + Details
Name: | eqr_LatestMaturityDate
Namespace Prefix: | eqr_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Lowest interest rate on derivatives designated as fair value or cash flow hedging instruments. + References No definition available. + Details
Name: | eqr_LowestInterestRate
Namespace Prefix: | eqr_
Data Type: | num:percentItemType
Balance Type: | na
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 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_NotionalAmountOfHedgeInstruments
Namespace Prefix: | eqr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Represents a spread that is dependent upon a credit rating or bids received from lenders and is blended with an interest rate for amounts borrowed under the term loan. + References No definition available. + Details
Name: | eqr_TermLoanFacilitySpread
Namespace Prefix: | eqr_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the principal amount of the Company's senior unsecured delayed draw term loan facility. + References No definition available. + Details
Name: | eqr_TermLoanPrincipalAmount
Namespace Prefix: | eqr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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

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- Details
Name: | us-gaap_DerivativeByNatureAxis=eqr_ForwardStartingSwapsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_DerivativeByNatureAxis=us-gaap_FairValueHedgingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_LongtermDebtTypeAxis=eqr_A2.375NotesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |