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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
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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%

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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 Partners capital units shares repurchased and retired. + References No definition available. + Details
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- Definition The number of restricted shares granted during the reporting period, net of cancellations. + 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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- Definition Number of shares issued during the period as a result of an employee stock purchase plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 2 -SubTopic 10 -Topic 505 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481112/505-10-50-2 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 505 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480008/505-10-S99-1 + Details
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