XML 76 R57.htm IDEA: XBRL DOCUMENT
v3.10.0.1

Summary of Significant Accounting Policies Tax (Parenthetical) (Details) - $ / shares | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Disclosure Summary Of Significant Accounting Policies Tax Parenthetical Details [Abstract] |  |
Dividend payable common share/unit, per share | $ 0.54 | $ 0.50375

X
- References No definition available. + Details
Name: | eqr_DisclosureSummaryOfSignificantAccountingPoliciesTaxParentheticalDetailsAbstract
Namespace Prefix: | eqr_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The per share amount of a dividend declared, but not paid, as of the financial reporting date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4304-108586 + Details
Name: | us-gaap_DividendsPayableAmountPerShare
Namespace Prefix: | us-gaap_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | instant