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Leases - Summary of Residential Bad Debt for Company's Properties (Parenthetical) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Leases [Abstract]
Bad debt, net from resident payments	$ 0.4	$ 0.5	$ 1.2	$ 2.4

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- Definition

Operating lease lease income bad debt net from resident payments.

+ References

No definition available.

+ Details

Name:	eqr_OperatingLeaseLeaseIncomeBadDebtNetFromResidentPayments
Namespace Prefix:	eqr_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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- References

No definition available.

+ Details

Name:	us-gaap_LeasesAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration