Equity, Capital and Other Interests - Changes in Operating Partnership's Issued and Outstanding General Partner Units and Limited Partner Units (Details) - shares	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
General and Limited Partner Units
Exercise of share options	82,742	173,249
Employee Share Purchase Plan (ESPP)	32,496	27,393
Restricted share grants, net	177,581	123,304
Restricted unit grants, net	159,283	229,913
Common Shares And Units Outstanding	390,672,373	391,413,304
Limited Partner Units
Total Units Outstanding	11,581,306	12,429,737
Restricted unit grants, net	159,283	229,913
Conversion of Limited Partner OP Units to EQR Common Shares	(7,967)	(144,567)
Total Units Outstanding	11,732,622	12,515,083
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	82,742	173,249
Employee Share Purchase Plan (ESPP)	32,496	27,393
Restricted share grants, net	177,581	123,304
Restricted unit grants, net	159,283	229,913
OP Units repurchased and retired	(652,452)
Common Shares And Units Outstanding	390,672,373	391,413,304
Limited Partner Units
Total Units Outstanding	11,581,306	12,429,737
Restricted unit grants, net	159,283	229,913
Conversion of Limited Partner OP Units to EQR Common Shares	(7,967)	(144,567)
Total Units Outstanding	11,732,622	12,515,083
Units Ownership Interest in Operating Partnership	3.00%	3.20%