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Schedule III - Real Estate and Accumulated Depreciation-Encumbrances Reconciliation (Details) | Dec. 31, 2017 USD ($) Property
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Total Consolidated Investment in Real Estate [Member] |
Overall summary of real estate and accumulated depreciation |
Encumbrances | $ 3,618,721,998
EQR-Wellfan 2008 LP [Member] |
Real Estate and Accumulated Depreciation Encumbrances Reconciliation [Abstract] |
Number of Properties Encumbered | Property | 10
Overall summary of real estate and accumulated depreciation |
Encumbrances | $ 549,547,007
Archstone Master Property [Domain] |
Real Estate and Accumulated Depreciation Encumbrances Reconciliation [Abstract] |
Number of Properties Encumbered | Property | 13
Overall summary of real estate and accumulated depreciation |
Encumbrances | $ 797,306,782
Portfolio Entity Encumbrances [Member] |
Real Estate and Accumulated Depreciation Encumbrances Reconciliation [Abstract] |
Number of Properties Encumbered | Property | 23
Overall summary of real estate and accumulated depreciation |
Encumbrances | $ 1,346,853,789
Individual Property Encumbrances [Member] |
Overall summary of real estate and accumulated depreciation |
Encumbrances | $ 2,271,868,209

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- Definition Overall summary of real estate and accumulated depreciation. + References No definition available. + Details
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- Definition Amount of lien or mortgage outstanding on real estate investment properties for entities with a substantial portion of business acquiring and holding investment real estate. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 970 -SubTopic 360 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-28) -URI http://asc.fasb.org/extlink&oid=6590653&loc=d3e638233-123024 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 10 -Section S99 -Paragraph 6 -Subparagraph (SX 210.5-04.(c) Schedule III) -URI http://asc.fasb.org/extlink&oid=27047687&loc=d3e5864-122674 + Details
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