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Equity, Capital and Other Interests EQR Common Shares (Details) - shares | 6 Months Ended |
--- | --- | ---
Jun. 30, 2015 | Dec. 31, 2014
Common Shares of beneficial interest, shares outstanding | 364,050,890 | 362,855,454
Common Shares Issued: |  |
Conversion of OP Units | 171,353 |
Exercise of share options | 814,827 |
Employee Share Purchase Plan (ESPP) | 40,873 |
Restricted Share Grants, net | 169,667 |
Conversion of restricted shares to restricted units | (1,284) |
Units |  |
Common Shares And Units Outstanding | 378,517,017 |
Units Ownership Interest in Operating Partnership | 3.80% |
Limited Partner [Member] |  |
Limited Partners' Capital Account, Units Outstanding | 14,466,127 | 14,298,691
Common Shares Issued: |  |
Conversion of OP Units | (171,353) |
Conversion of restricted shares to restricted units | 1,284 |
Units |  |
Restricted units, net | 337,505 |

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- Definition Number of all classes of common stock held by shareholders, which is net of related treasury stock, and number of all Operating Partnership Units held by various individuals and entities that contributed their properties to the Operating Partnership. + References No definition available. + Details
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- Definition Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 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 210.5-02.29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 30 -Article 5 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 + Details
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