v3.26.1
Cover Page
Aug. 17, 2026
Entity Information [Line Items]  
Document Type 8-K
Amendment Flag false
Document Period End Date Aug. 17, 2026
Entity Registrant Name ERP OPERATING LIMITED PARTNERSHIP
Entity Central Index Key 0000931182
Entity Emerging Growth Company false
Entity File Number 0-24920
Entity Incorporation, State or Country Code IL
Entity Tax Identification Number 36-3894853
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 Information, Former Legal or Registered Name Not applicable
Written Communications false
Soliciting Material false
Pre-commencement Tender Offer false
Pre-commencement Issuer Tender Offer false
Title of 12(b) Security Common Shares of Beneficial Interest,$0.01 Par Value (Vivmark Residential)
Trading Symbol EQR
Security Exchange Name NYSE
Other Address [Member]  
Entity Information [Line Items]  
Entity Address, Address Line One 4040 Wilson Blvd.
Entity Address, Address Line Two Suite 1000
Entity Address, City or Town Arlington
Entity Address, State or Province VA
Entity Address, Postal Zip Code 22203
City Area Code 703
Local Phone Number 329-6300
Vivmark Residential [Member]  
Entity Information [Line Items]  
Amendment Flag false
Entity Registrant Name VIVMARK RESIDENTIAL
Entity Central Index Key 0000906107
Entity Emerging Growth Company false
Entity File Number 1-12252
Entity Incorporation, State or Country Code MD
Entity Tax Identification Number 13-3675988