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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	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
General and Limited Partner Units
Exercise of share options	506,342	214,521
Employee Share Purchase Plan (ESPP)	32,572	13,606
Restricted share grants, net	76,499	163,098
Restricted unit grants, net	184,301	243,063
Common Shares And Units Outstanding	386,959,787	386,036,487
Limited Partner Units
Total Units Outstanding	13,858,073	13,731,315
Restricted unit grants, net	184,301	243,063
Conversion of Limited Partner OP Units to EQR Common Shares		(41,945)
Total Units Outstanding	14,042,374	13,932,433
Units Ownership Interest in Operating Partnership	3.60%	3.60%
ERPOP [Member]
General and Limited Partner Units
Common Shares And Units Outstanding	386,160,073	385,402,199
Exercise of share options	506,342	214,521
Employee Share Purchase Plan (ESPP)	32,572	13,606
Restricted share grants, net	76,499	163,098
Restricted unit grants, net	184,301	243,063
Common Shares And Units Outstanding	386,959,787	386,036,487
Limited Partner Units
Total Units Outstanding	13,858,073	13,731,315
Restricted unit grants, net	184,301	243,063
Conversion of Limited Partner OP Units to EQR Common Shares		(41,945)
Total Units Outstanding	14,042,374	13,932,433
Units Ownership Interest in Operating Partnership	3.60%	3.60%

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

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- Definition

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

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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.

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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.

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

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

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