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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	9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024
General and Limited Partner Units
Exercise of share options	85,217	284,021
Employee Share Purchase Plan (ESPP)	33,278	54,061
Restricted share grants, net	208,275	186,672
Restricted unit grants, net	297,077	172,667
Common Shares And Units Outstanding	390,176,185	390,917,692
Limited Partner Units
Total Units Outstanding	11,543,773	11,581,306
Restricted unit grants, net	297,077	172,667
Conversion of Limited Partner OP Units to EQR Common Shares	(2,211,299)	(191,019)
Total Units Outstanding	9,629,551	11,562,954
Units Ownership Interest in Operating Partnership	2.50%	3.00%
ERPOP [Member]
General and Limited Partner Units
Common Shares And Units Outstanding	391,019,156	390,872,723
Exercise of share options	85,217	284,021
Employee Share Purchase Plan (ESPP)	33,278	54,061
Restricted share grants, net	208,275	186,672
Restricted unit grants, net	297,077	172,667
OP Units repurchased and retired	(1,466,818)	(652,452)
Common Shares And Units Outstanding	390,176,185	390,917,692
Limited Partner Units
Total Units Outstanding	11,543,773	11,581,306
Restricted unit grants, net	297,077	172,667
Conversion of Limited Partner OP Units to EQR Common Shares	(2,211,299)	(191,019)
Total Units Outstanding	9,629,551	11,562,954
Units Ownership Interest in Operating Partnership	2.50%	3.00%

X

- Definition

Number of all classes of common stock held by shareholders, which is net of related treasury stock, and number of all Operating Partnership Units held by various individuals and entities that contributed their properties to the Operating Partnership.

+ References

No definition available.

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- Definition

Number of units issued during the period as a result of a long-term incentive plan.

+ References

No definition available.

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- Definition

Partners capital units shares repurchased and retired.

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- Definition

The number of restricted shares granted during the reporting period, net of cancellations.

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- Definition

OP Units converted into shares of stock during the period. An example of a convertible unit is an umbrella partnership real estate investment trust unit (UPREIT unit). Subject to certain exceptions, this unit can be exchanged for Common Shares on a one-for-one basis.

+ References

No definition available.

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- Definition

Units outstanding.

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- Definition

Represents the noncontrolling interests (comprised of Units and LTIP Units) ownership interest in the Operating Partnership.

+ References

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- Definition

Number of shares issued during the period as a result of an employee stock purchase plan.

+ References

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- Definition

Number of share options (or share units) exercised during the current period.

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