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Leases - Summary of Residential Bad Debt for Company's Properties (Details) - Residential Leases [Member] - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Lessor Lease Description [Line Items]
Bad debt, net	$ (1,748)	$ 12,079	$ 8,147	$ 25,772
% of rental income	(0.30%)	2.10%	0.60%	2.20%

X

- Definition

Operating lease lease income bad debt net.

+ References

No definition available.

+ Details

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

X

- Definition

Percentage of rental income.

+ References

No definition available.

+ Details

Name:	eqr_PercentageOfRentalIncome
Namespace Prefix:	eqr_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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

X

- Details

Name:	us-gaap_TypeOfArrangementAxis=eqr_ResidentialLeasesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: