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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]	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Partial Redemption Percentage	8.29%	8.29%	8.29%
ERPOP [Member]
Partial Redemption Percentage	8.29%	8.29%	8.29%

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- Definition

Partial redemption percentage

+ References

No definition available.

+ Details

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- Details

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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: