XML 93 R72.htm IDEA: XBRL DOCUMENT
v3.6.0.2

Derivative and Other Fair Value Instruments (Details 1) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
--- | --- | --- | --- | ---
Derivatives, Fair Value [Line Items] |  |  |  |
Fair Value Of Serp Investments | $ 124,420 | $ 105,942 |  |
Assets, Fair Value Disclosure | 126,277 | 109,597 |  |
Other Liabilities, Fair Value Disclosure | 124,420 | 105,942 |  |
Liabilities, Fair Value Disclosure | 124,420 | 106,615 |  |
Redeemable Noncontrolling Interests – Operating Partnership | 442,092 | 566,783 | $ 500,733 | $ 363,144
Fair Value, Inputs, Level 1 [Member] |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Fair Value Of Serp Investments | 124,420 | 105,942 |  |
Assets, Fair Value Disclosure | 124,420 | 105,942 |  |
Other Liabilities, Fair Value Disclosure | 124,420 | 105,942 |  |
Liabilities, Fair Value Disclosure | 124,420 | 105,942 |  |
Redeemable Noncontrolling Interests – Operating Partnership | 0 | 0 |  |
Fair Value, Inputs, Level 2 [Member] |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Fair Value Of Serp Investments | 0 | 0 |  |
Assets, Fair Value Disclosure | 1,857 | 3,655 |  |
Other Liabilities, Fair Value Disclosure | 0 | 0 |  |
Liabilities, Fair Value Disclosure | 0 | 673 |  |
Redeemable Noncontrolling Interests – Operating Partnership | 442,092 | 566,783 |  |
Fair Value, Inputs, Level 3 [Member] |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Fair Value Of Serp Investments | 0 | 0 |  |
Assets, Fair Value Disclosure | 0 | 0 |  |
Other Liabilities, Fair Value Disclosure | 0 | 0 |  |
Liabilities, Fair Value Disclosure | 0 | 0 |  |
Redeemable Noncontrolling Interests – Operating Partnership | 0 | 0 |  |
Fair Value Hedging [Member] |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Derivative Asset | 1,857 | 3,655 |  |
Fair Value Hedging [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Derivative Asset | 0 | 0 |  |
Fair Value Hedging [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Derivative Asset | 1,857 | 3,655 |  |
Fair Value Hedging [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Derivative Asset | $ 0 | 0 |  |
Forward Starting Swaps [Member] |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Derivative liability, fair value |  | 673 |  |
Forward Starting Swaps [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Derivative liability, fair value |  | 0 |  |
Forward Starting Swaps [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Derivative liability, fair value |  | 673 |  |
Forward Starting Swaps [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Derivative liability, fair value |  | $ 0 |  |

X
- Definition Fair value of employee holdings other than common shares within the supplemental executive retirement plan at the balance sheet date. + References No definition available. + Details
Name: | eqr_FairValueOfSerpInvestments
Namespace Prefix: | eqr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The greater of carrying value (book value) or fair market value of an entity's issued and outstanding stock which is not included within permanent equity in Stockholders Equity. Temporary equity is a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable. Includes any type of security that is redeemable at a fixed or determinable price or on a fixed or determinable date or dates, is redeemable at the option of the holder, or has conditions for redemption which are not solely within the control of the issuer. If convertible, the issuer does not control the actions or events necessary to issue the maximum number of shares that could be required to be delivered under the conversion option if the holder exercises the option to convert the stock to another class of equity. + References No definition available. + Details
Name: | eqr_RedeemableNoncontrollingInterestsOperatingPartnership
Namespace Prefix: | eqr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
Name: | us-gaap_AssetsFairValueDisclosure
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13433-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13495-108611 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=51825145&loc=SL20226008-175313 + Details
Name: | us-gaap_DerivativeAssets
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Fair value, before effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 20 -Section 50 -Paragraph 4D -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=64830801&loc=SL51823488-111719 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (a),(c) -URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5624163-113959 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=51825145&loc=SL20226000-175313 + Details
Name: | us-gaap_DerivativeFairValueOfDerivativeLiability
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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

X
- Definition Fair value of financial and nonfinancial obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
Name: | us-gaap_LiabilitiesFairValueDisclosure
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Fair value portion of other liabilities. + References No definition available. + Details
Name: | us-gaap_OtherLiabilitiesFairValueDisclosure
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel1Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel2Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel3Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

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