Equity, Capital and Other Interests - Changes in Operating Partnership's Issued and Outstanding General Partner Units and Limited Partner Units (Details) - shares	6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023
General and Limited Partner Units
Exercise of share options	119,516	232,317
Employee Share Purchase Plan (ESPP)	47,466	40,346
Restricted share grants, net	190,804	149,722
Restricted unit grants, net	172,667	166,344
Common Shares And Units Outstanding	390,750,724	391,448,174
Limited Partner Units
Total Units Outstanding	11,581,306	12,429,737
Restricted unit grants, net	172,667	166,344
Conversion of Limited Partner OP Units to EQR Common Shares	(90,131)	(180,629)
Total Units Outstanding	11,663,842	12,415,452
Units Ownership Interest in Operating Partnership	3.00%	3.20%
ERPOP [Member]
General and Limited Partner Units
Common Shares And Units Outstanding	390,872,723	390,859,445
Exercise of share options	119,516	232,317
Employee Share Purchase Plan (ESPP)	47,466	40,346
Restricted share grants, net	190,804	149,722
Restricted unit grants, net	172,667	166,344
OP Units repurchased and retired	(652,452)
Common Shares And Units Outstanding	390,750,724	391,448,174
Limited Partner Units
Total Units Outstanding	11,581,306	12,429,737
Restricted unit grants, net	172,667	166,344
Conversion of Limited Partner OP Units to EQR Common Shares	(90,131)	(180,629)
Total Units Outstanding	11,663,842	12,415,452
Units Ownership Interest in Operating Partnership	3.00%	3.20%