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CONSOLIDATED STATEMENTS OF CHANGES IN CAPITAL OF ERP OPERATING LIMITED PARTNERSHIP (Parenthetical) - Eight Point Two Nine Percentage Series K Cumulative Redeemable Preferred Stock [Member] | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Partial Redemption Percentage | 8.29% | 8.29% | 8.29% | 8.29%
ERPOP [Member] |  |  |  |
Partial Redemption Percentage | 8.29% | 8.29% | 8.29% | 8.29%

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- Definition Partial redemption percentage + References No definition available. + Details
Name: | eqr_PartialRedemptionPercentage
Namespace Prefix: | eqr_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_StatementClassOfStockAxis=eqr_EightPointTwoNinePercentageSeriesKCumulativeRedeemablePreferredStockMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | dei_LegalEntityAxis=eqr_ERPOPMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |