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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 | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
General and Limited Partner Units |  |  |
Common Shares And Units Outstanding | 390,859,445 | 388,186,222 |
Issuance of OP Units |  | 1,740,550 |
Exercise of share options | 495,690 | 468,021 | 1,710,692
Employee Share Purchase Plan (ESPP) | 68,136 | 66,835 | 70,702
Restricted share grants, net | 148,474 | 174,575 | 89,593
Restricted unit grants, net | 165,364 | 223,242 | 155,162
Common Shares And Units Outstanding | 390,872,723 | 390,859,445 | 388,186,222
Limited Partner Units |  |  |
Total Units Outstanding | 12,429,737 | 12,659,027 | 13,858,073
Restricted unit grants, net | 165,364 | 223,242 | 155,162
Conversion of Limited Partner OP Units to EQR Common Shares | (1,013,795) | (452,532) | (1,354,208)
Total Units Outstanding | 11,581,306 | 12,429,737 | 12,659,027
Units Ownership Interest in Operating Partnership | 3.00% | 3.20% | 3.30%
ERPOP [Member] |  |  |
General and Limited Partner Units |  |  |
Common Shares And Units Outstanding | 390,859,445 | 388,186,222 | 386,160,073
Issuance of OP Units |  | 1,740,550 |
Exercise of share options | 495,690 | 468,021 | 1,710,692
Employee Share Purchase Plan (ESPP) | 68,136 | 66,835 | 70,702
Restricted share grants, net | 148,474 | 174,575 | 89,593
Restricted unit grants, net | 165,364 | 223,242 | 155,162
Common Shares And Units Outstanding | 390,872,723 | 390,859,445 | 388,186,222
OP Units repurchased and retired | (864,386) |  |
Limited Partner Units |  |  |
Total Units Outstanding | 12,429,737 | 12,659,027 | 13,858,073
Restricted unit grants, net | 165,364 | 223,242 | 155,162
Conversion of Limited Partner OP Units to EQR Common Shares | (1,013,795) | (452,532) | (1,354,208)
Total Units Outstanding | 11,581,306 | 12,429,737 | 12,659,027
Units Ownership Interest in Operating Partnership | 3.00% | 3.20% | 3.30%

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- 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. + Details
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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. + Details
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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. + Details
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- Definition Represents the noncontrolling interests (comprised of Units and LTIP Units) ownership interest in the Operating Partnership. + References No definition available. + Details
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