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Document and Entity Information
Oct. 22, 2019
Cover [Abstract]  
Entity Registrant Name EQUITY RESIDENTIAL
Entity Central Index Key 0000906107
Document Type 8-K
Document Period End Date Oct. 22, 2019
Amendment Flag false
Entity File Number 1-12252
Entity Tax Identification Number 13-3675988
Entity Address, Address Line One Two North Riverside Plaza
Entity Address City Or Town Chicago
Entity Address State Or Province IL
Entity Address Postal Zip Code 60606
City Area Code 312
Local Phone Number 474-1300
Entity Incorporation, State or Country Code MD
Written Communications false
Soliciting Material false
Pre-commencement Tender Offer false
Pre-commencement Issuer Tender Offer false
Entity Emerging Growth Company false
Title of 12(b) Security Common Shares of Beneficial Interest, $0.01 Par Value
Trading Symbol EQR
Security Exchange Name NYSE