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Equity, Capital and Other Interests - Changes in Operating Partnership's Issued and Outstanding Units (Details) - shares	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
General and Limited Partner Units
Exercise of share options	1,430,048	194,796
Employee Share Purchase Plan (ESPP)	37,263	61,321
Restricted share grants, net	160,460	122,877
Restricted unit grants, net	140,055	267,074
Common Shares And Units Outstanding	385,077,022	382,432,588
LIMITED PARTNERS
Total Units Outstanding	13,904,035	13,768,438
Restricted unit grants, net	140,055	267,074
Conversion of Limited Partner OP Units to EQR Common Shares	(294,400)	(12,510)
Total Units Outstanding	13,749,690	14,023,002
Units Ownership Interest in Operating Partnership	3.60%	3.70%
ERPOP [Member]
General and Limited Partner Units
Common Shares And Units Outstanding	383,309,196	381,786,520
Exercise of share options	1,430,048	194,796
Employee Share Purchase Plan (ESPP)	37,263	61,321
Restricted share grants, net	160,460	122,877
Restricted unit grants, net	140,055	267,074
Common Shares And Units Outstanding	385,077,022	382,432,588
LIMITED PARTNERS
Total Units Outstanding	13,904,035	13,768,438
Restricted unit grants, net	140,055	267,074
Conversion of Limited Partner OP Units to EQR Common Shares	(294,400)	(12,510)
Total Units Outstanding	13,749,690	14,023,002
Units Ownership Interest in Operating Partnership	3.60%	3.70%

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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