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Commitments and Contingencies (Details) | 6 Months Ended
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Jun. 30, 2016 USD ($)
Litigation Settlement, Amount | $ 1,500,000
Loss Contingency Accrual, Period Increase (Decrease) | (500,000)
Loss Contingency Accrual | $ 1,000,000
Projects in various stages of development | 8
Units in various stages of development | 2,850
Consolidated Project Under Development Commitment Fund | $ 491,500,000
Various stages of development with estimated completion dates ranging through December 31, 2018 | Dec. 31, 2018
Partially Owned Properties – Unconsolidated |
Number Of Unconsolidated Projects | 2

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- Definition Represents the company's remaining funding obligation (i.e. total project costs less book value) for consolidated projects that are under development. + References No definition available. + Details
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- Definition Total number of open development projects. May include projects that are held for and/or under development, completed and not stabilized or completed and stabilized. These projects are consolidated. + References No definition available. + Details
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Namespace Prefix: | eqr_
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Balance Type: | na
Period Type: | instant

X
- Definition Total number of unconsolidated open development projects. May include projects that are held for and/or under development, completed and not stabilized or completed and stabilized. + References No definition available. + Details
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Namespace Prefix: | eqr_
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Balance Type: | na
Period Type: | instant

X
- Definition Total number of units that are associated with open development projects. May include projects that are held for and/or under development, completed and not stabilized or completed and stabilized. These units are consolidated. + References No definition available. + Details
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- Definition Represents the latest completion date for the current projects under development. + References No definition available. + Details
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Namespace Prefix: | eqr_
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Balance Type: | na
Period Type: | duration

X
- Definition Amount of loss contingency liability. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14326-108349 + Details
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Balance Type: | credit
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X
- Definition Amount of payments made reducing loss contingency liability. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14326-108349 + Details
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- Definition Amount of increase (decrease) in loss contingency liability. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14326-108349 + Details
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- Details
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