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Leases - Summary of Residential and Non-Residential Accounts Receivable and Straight-Line Receivable Balances (Parenthetical) (Details)	Mar. 31, 2021
Leases [Abstract]
Holding percentage of residential security deposits of net receivable	35.40%

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- Definition

Holding percentage of residential security deposits of net receivable.

+ References

No definition available.

+ Details

Name:	eqr_HoldingPercentageOfResidentialSecurityDepositsOfNetReceivables
Namespace Prefix:	eqr_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

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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