    <SEC-DOCUMENT>0001564590-21-052009-index.html : 20211026
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    <ACCEPTANCE-DATETIME>20211026162715
    ACCESSION NUMBER:		0001564590-21-052009
    CONFORMED SUBMISSION TYPE:	8-K
    PUBLIC DOCUMENT COUNT:		16
    CONFORMED PERIOD OF REPORT:	20211026
    ITEM INFORMATION:		Results of Operations and Financial Condition
    ITEM INFORMATION:		Financial Statements and Exhibits
    FILED AS OF DATE:		20211026
    DATE AS OF CHANGE:		20211026

    FILER:

    	COMPANY DATA:
    		COMPANY CONFORMED NAME:			EQUITY RESIDENTIAL
    		CENTRAL INDEX KEY:			0000906107
    		STANDARD INDUSTRIAL CLASSIFICATION:	REAL ESTATE INVESTMENT TRUSTS [6798]
    		IRS NUMBER:				363877868
    		STATE OF INCORPORATION:			MD
    		FISCAL YEAR END:			1231

    	FILING VALUES:
    		FORM TYPE:		8-K
    		SEC ACT:		1934 Act
    		SEC FILE NUMBER:	001-12252
    		FILM NUMBER:		211348917

    	BUSINESS ADDRESS:
    		STREET 1:		EQUITY RESIDENTIAL
    		STREET 2:		TWO NORTH RIVERSIDE PLAZA, SUITE 400
    		CITY:			CHICAGO
    		STATE:			IL
    		ZIP:			60606
    		BUSINESS PHONE:		3129281178

    	MAIL ADDRESS:
    		STREET 1:		TWO NORTH RIVERSIDE PLAZA
    		STREET 2:		SUITE 400
    		CITY:			CHICAGO
    		STATE:			IL
    		ZIP:			60606

    	FORMER COMPANY:
    		FORMER CONFORMED NAME:	EQUITY RESIDENTIAL PROPERTIES TRUST
    		DATE OF NAME CHANGE:	19930524
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    <DOCUMENT>
    <TYPE>8-K
    <SEQUENCE>1
    <FILENAME>eqr-8k_20211026.htm
    <DESCRIPTION>8-K
    <TEXT>
    Document 1 - file: eqr-8k_20211026.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-99.1
    <SEQUENCE>2
    <FILENAME>eqr-ex991_24.htm
    <DESCRIPTION>EX-99.1
    <TEXT>
    Document 2 - file: eqr-ex991_24.htm

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    <SEQUENCE>3
    <FILENAME>gpyltczduigl000001.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 3 - file: gpyltczduigl000001.jpg

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    <DOCUMENT>
    <TYPE>EX-101.SCH
    <SEQUENCE>6
    <FILENAME>eqr-20211026.xsd
    <DESCRIPTION>XBRL TAXONOMY EXTENSION SCHEMA
    <TEXT>
    Document 6 - file: eqr-20211026.xsd

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    <DOCUMENT>
    <TYPE>EX-101.LAB
    <SEQUENCE>7
    <FILENAME>eqr-20211026_lab.xml
    <DESCRIPTION>XBRL TAXONOMY EXTENSION LABEL LINKBASE
    <TEXT>
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    <TYPE>EX-101.PRE
    <SEQUENCE>8
    <FILENAME>eqr-20211026_pre.xml
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    <TEXT>
    Document 8 - file: eqr-20211026_pre.xml

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    <SEQUENCE>9
    <FILENAME>eqr-8k_20211026_htm.xml
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    <SEQUENCE>10
    <FILENAME>R1.htm
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    <TEXT>
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    <DOCUMENT>
    <TYPE>EXCEL
    <SEQUENCE>11
    <FILENAME>Financial_Report.xlsx
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 11 - file: Financial_Report.xlsx

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    <DOCUMENT>
    <TYPE>XML
    <SEQUENCE>12
    <FILENAME>Show.js
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 12 - file: Show.js

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    <DOCUMENT>
    <TYPE>XML
    <SEQUENCE>13
    <FILENAME>report.css
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
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    <DOCUMENT>
    <TYPE>XML
    <SEQUENCE>14
    <FILENAME>FilingSummary.xml
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    <TEXT>
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    <DOCUMENT>
    <TYPE>JSON
    <SEQUENCE>16
    <FILENAME>MetaLinks.json
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    <TEXT>
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    <DOCUMENT>
    <TYPE>ZIP
    <SEQUENCE>17
    <FILENAME>0001564590-21-052009-xbrl.zip
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
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