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Derivative and Other Fair Value Instruments (Details 3) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Increase (Decrease) in Fair Value of Interest Rate Fair Value Hedging Instruments | $ 1,597 us-gaap_IncreaseDecreaseInFairValueOfInterestRateFairValueHedgingInstruments1 | $ (1,523)us-gaap_IncreaseDecreaseInFairValueOfInterestRateFairValueHedgingInstruments1 | $ (7,448)us-gaap_IncreaseDecreaseInFairValueOfInterestRateFairValueHedgingInstruments1
Increase (Decrease) in Fair Value of Hedged Item in Interest Rate Fair Value Hedge | (1,597)us-gaap_IncreaseDecreaseInFairValueOfHedgedItemInInterestRateFairValueHedge1 | 1,523 us-gaap_IncreaseDecreaseInFairValueOfHedgedItemInInterestRateFairValueHedge1 | 7,448 us-gaap_IncreaseDecreaseInFairValueOfHedgedItemInInterestRateFairValueHedge1
Effective Portion - Amount of Gain/ (Loss) Recognized in OCI on Derivative | (33,215)us-gaap_DerivativeInstrumentsGainRecognizedInOtherComprehensiveIncomeEffectivePortion | 18,771 us-gaap_DerivativeInstrumentsGainRecognizedInOtherComprehensiveIncomeEffectivePortion | (11,772)us-gaap_DerivativeInstrumentsGainRecognizedInOtherComprehensiveIncomeEffectivePortion
Effective Portion - Amount of Gain/ (Loss) Reclassified from Accumulated OCI into Income | (16,868)us-gaap_DerivativeInstrumentsLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortion | (20,141)us-gaap_DerivativeInstrumentsLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortion | (14,678)us-gaap_DerivativeInstrumentsLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortion
Ineffective Portion - Amount of Gain/ (Loss) Reclassifed from Accumulated OCI into Income | 91 us-gaap_DerivativeInstrumentsGainLossRecognizedInIncomeIneffectivePortionAndAmountExcludedFromEffectivenessTestingNet | 0 us-gaap_DerivativeInstrumentsGainLossRecognizedInIncomeIneffectivePortionAndAmountExcludedFromEffectivenessTestingNet | 0 us-gaap_DerivativeInstrumentsGainLossRecognizedInIncomeIneffectivePortionAndAmountExcludedFromEffectivenessTestingNet
Interest Rate Swap [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Increase (Decrease) in Fair Value of Interest Rate Fair Value Hedging Instruments | 1,597 us-gaap_IncreaseDecreaseInFairValueOfInterestRateFairValueHedgingInstruments1 / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember | (1,523)us-gaap_IncreaseDecreaseInFairValueOfInterestRateFairValueHedgingInstruments1 / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember | (7,448)us-gaap_IncreaseDecreaseInFairValueOfInterestRateFairValueHedgingInstruments1 / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember
Increase (Decrease) in Fair Value of Hedged Item in Interest Rate Fair Value Hedge | (1,597)us-gaap_IncreaseDecreaseInFairValueOfHedgedItemInInterestRateFairValueHedge1 / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember | 1,523 us-gaap_IncreaseDecreaseInFairValueOfHedgedItemInInterestRateFairValueHedge1 / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember | 7,448 us-gaap_IncreaseDecreaseInFairValueOfHedgedItemInInterestRateFairValueHedge1 / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember
Derivative, Description of Hedged Item | Fixed rate debt | Fixed rate debt | Fixed rate debt
Forward Starting Swaps/Treasury Locks [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Effective Portion - Amount of Gain/ (Loss) Recognized in OCI on Derivative | (33,215)us-gaap_DerivativeInstrumentsGainRecognizedInOtherComprehensiveIncomeEffectivePortion / us-gaap_DerivativeInstrumentRiskAxis = eqr_ForwardStartingSwapsTreasuryLocksMember | 18,771 us-gaap_DerivativeInstrumentsGainRecognizedInOtherComprehensiveIncomeEffectivePortion / us-gaap_DerivativeInstrumentRiskAxis = eqr_ForwardStartingSwapsTreasuryLocksMember | (11,772)us-gaap_DerivativeInstrumentsGainRecognizedInOtherComprehensiveIncomeEffectivePortion / us-gaap_DerivativeInstrumentRiskAxis = eqr_ForwardStartingSwapsTreasuryLocksMember
Effective Portion - Amount of Gain/ (Loss) Reclassified from Accumulated OCI into Income | (16,868)us-gaap_DerivativeInstrumentsLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortion / us-gaap_DerivativeInstrumentRiskAxis = eqr_ForwardStartingSwapsTreasuryLocksMember | (20,141)us-gaap_DerivativeInstrumentsLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortion / us-gaap_DerivativeInstrumentRiskAxis = eqr_ForwardStartingSwapsTreasuryLocksMember | (14,678)us-gaap_DerivativeInstrumentsLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortion / us-gaap_DerivativeInstrumentRiskAxis = eqr_ForwardStartingSwapsTreasuryLocksMember
Ineffective Portion - Amount of Gain/ (Loss) Reclassifed from Accumulated OCI into Income | $ 91 us-gaap_DerivativeInstrumentsGainLossRecognizedInIncomeIneffectivePortionAndAmountExcludedFromEffectivenessTestingNet / us-gaap_DerivativeInstrumentRiskAxis = eqr_ForwardStartingSwapsTreasuryLocksMember | $ 0 us-gaap_DerivativeInstrumentsGainLossRecognizedInIncomeIneffectivePortionAndAmountExcludedFromEffectivenessTestingNet / us-gaap_DerivativeInstrumentRiskAxis = eqr_ForwardStartingSwapsTreasuryLocksMember | $ 0 us-gaap_DerivativeInstrumentsGainLossRecognizedInIncomeIneffectivePortionAndAmountExcludedFromEffectivenessTestingNet / us-gaap_DerivativeInstrumentRiskAxis = eqr_ForwardStartingSwapsTreasuryLocksMember

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- Definition Description of the hedged item related to the derivative. Includes the type of instrument hedged, contract amount, term, and so forth. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5579240-113959 + Details
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- Definition The portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments representing (a) the amount of the hedge ineffectiveness and (b) the amount, if any, excluded from the assessment of hedge effectiveness. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624171-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 25 -Section 50 -Paragraph 1 -Subparagraph (a)(1),(2) -URI http://asc.fasb.org/extlink&oid=6886632&loc=d3e76258-113986 + Details
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- Definition The effective portion of gains on derivative instruments designated and qualifying as hedging instruments that was recognized in other comprehensive income during the current period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=36458714&loc=SL7669646-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624171-113959 + Details
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- Definition The effective portion of loss reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624171-113959 + Details
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- Definition Amount of unrealized gain (loss) included in earnings related to the fair value of the hedged item in an interest rate fair value hedge, offset by the gain (loss) on the hedging instrument to the extent that the fair value hedge is determined to be effective. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5618551-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624171-113959 + Details
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- Definition Amount of unrealized gain (loss) related to the fair value of interest rate derivatives designated as fair value hedging instruments, as offset by the gain (loss) on the hedged item to the extent that the fair value hedge is determined to be effective. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5618551-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624171-113959 + Details
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