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Document and Entity Information - USD ($)
$ in Billions
 12 Months Ended
Dec. 31, 2024
Feb. 06, 2025
Jun. 30, 2024
Document Information [Line Items]      
Entity Registrant Name EQUITY RESIDENTIAL    
Entity Central Index Key 0000906107    
Document Type 10-K    
Document Period End Date Dec. 31, 2024    
Amendment Flag false    
Document Fiscal Year Focus 2024    
Document Fiscal Period Focus FY    
Trading Symbol EQR    
Current Fiscal Year End Date --12-31    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Filer Category Large Accelerated Filer    
Entity Shell Company false    
Entity Small Business false    
Entity Emerging Growth Company false    
Entity Public Float     $ 26.3
Entity Common Stock, Shares Outstanding   379,705,225  
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    
Title of 12(b) Security Common Shares of Beneficial Interest,$0.01 Par Value (Equity Residential)    
Security Exchange Name NYSE    
Document Annual Report true    
Document Transition Report false    
Entity Interactive Data Current Yes    
ICFR Auditor Attestation Flag true    
Document Financial Statement Error Correction [Flag] false    
Auditor Name Ernst and Young LLP    
Auditor Location Chicago, Illinois, USA    
Auditor Firm ID 42    
Documents Incorporated by Reference

Part III incorporates by reference certain information that will be contained in Equity Residential’s Proxy Statement relating to its 2025 Annual Meeting of Shareholders, which Equity Residential intends to file no later than 120 days after the end of its fiscal year ended December 31, 2024, and thus these items have been omitted in accordance with General Instruction G(3) to Form 10-K. Equity Residential is the general partner and 97.0% owner of ERP Operating Limited Partnership.

    
Auditor Opinion [Text Block]

Opinion on the Financial Statements

 

We have audited the accompanying consolidated balance sheets of Equity Residential (the Company) as of December 31, 2024 and 2023, the related consolidated statements of operations and comprehensive income, changes in equity and cash flows for each of the three years in the period ended December 31, 2024, and the related notes and financial statement schedule listed in the Index at Item 15(a) (collectively referred to as the “consolidated financial statements”). In our opinion, the consolidated financial statements present fairly, in all material respects, the financial position of the Company at December 31, 2024 and 2023, and the results of its operations and its cash flows for each of the three years in the period ended December 31, 2024, in conformity with U.S. generally accepted accounting principles.

 

We also have audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States) (PCAOB), the Company's internal control over financial reporting as of December 31, 2024, based on criteria established in Internal Control – Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission (2013 framework), and our report dated February 13, 2025 expressed an unqualified opinion thereon.

    
ERPOP [Member]      
Document Information [Line Items]      
Entity Registrant Name ERP OPERATING LIMITED PARTNERSHIP    
Entity Central Index Key 0000931182    
Document Type 10-K    
Document Period End Date Dec. 31, 2024    
Amendment Flag false    
Document Fiscal Year Focus 2024    
Document Fiscal Period Focus FY    
No Trading Symbol Flag true    
Current Fiscal Year End Date --12-31    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Filer Category Non-accelerated Filer    
Entity Shell Company false    
Entity Small Business false    
Entity Emerging Growth Company false    
Entity File Number 0-24920    
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 Incorporation, State or Country Code IL    
Title of 12(b) Security 7.57% Notes due August 15, 2026(ERP Operating Limited Partnership)    
Security Exchange Name NYSE    
Document Annual Report true    
Document Transition Report false    
Entity Interactive Data Current Yes    
ICFR Auditor Attestation Flag true    
Document Financial Statement Error Correction [Flag] false    
Auditor Name Ernst and Young LLP    
Auditor Location Chicago, Illinois, USA    
Auditor Firm ID 42    
Auditor Opinion [Text Block]

Opinion on the Financial Statements

 

We have audited the accompanying consolidated balance sheets of ERP Operating Limited Partnership (the Operating Partnership) as of December 31, 2024 and 2023, the related consolidated statements of operations and comprehensive income, changes in capital and cash flows for each of the three years in the period ended December 31, 2024, and the related notes and financial statement schedule listed in the Index at Item 15(a) (collectively referred to as the “consolidated financial statements”). In our opinion, the consolidated financial statements present fairly, in all material respects, the financial position of the Operating Partnership at December 31, 2024 and 2023, and the results of its operations and its cash flows for each of the three years in the period ended December 31, 2024, in conformity with U.S. generally accepted accounting principles.

 

We also have audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States) (PCAOB), the Operating Partnership’s internal control over financial reporting as of December 31, 2024, based on criteria established in Internal Control – Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission (2013 framework), and our report dated February 13, 2025 expressed an unqualified opinion thereon.