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Equity, Capital and Other Interests - Changes in Operating Partnership's Issued and Outstanding General Partner Units and Limited Partner Units (Details) - shares
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
General and Limited Partner Units      
Common Shares And Units Outstanding 390,872,723 390,859,445  
Issuance of OP Units     1,740,550
Exercise of share options 375,436 495,690 468,021
Employee Share Purchase Plan (ESPP) 65,198 68,136 66,835
Restricted share grants, net 185,584 148,474 174,575
Restricted unit grants, net 172,667 165,364 223,242
Common Shares And Units Outstanding 391,019,156 390,872,723 390,859,445
Limited Partner Units      
Total Units Outstanding 11,581,306 12,429,737 12,659,027
Restricted unit grants, net 172,667 165,364 223,242
Conversion of Limited Partner OP Units to EQR Common Shares (210,200) (1,013,795) (452,532)
Total Units Outstanding 11,543,773 11,581,306 12,429,737
Units Ownership Interest in Operating Partnership 3.00% 3.00% 3.20%
ERPOP [Member]      
General and Limited Partner Units      
Common Shares And Units Outstanding 390,872,723 390,859,445 388,186,222
Issuance of OP Units     1,740,550
Exercise of share options 375,436 495,690 468,021
Employee Share Purchase Plan (ESPP) 65,198 68,136 66,835
Restricted share grants, net 185,584 148,474 174,575
Restricted unit grants, net 172,667 165,364 223,242
OP Units repurchased and retired (652,452) (864,386)  
Common Shares And Units Outstanding 391,019,156 390,872,723 390,859,445
Limited Partner Units      
Total Units Outstanding 11,581,306 12,429,737 12,659,027
Restricted unit grants, net 172,667 165,364 223,242
Conversion of Limited Partner OP Units to EQR Common Shares (210,200) (1,013,795) (452,532)
Total Units Outstanding 11,543,773 11,581,306 12,429,737
Units Ownership Interest in Operating Partnership 3.00% 3.00% 3.20%