Commitments and Contingencies - Additional Information (Details) $ in Millions	9 Months Ended
Sep. 30, 2022 USD ($) Investment
Commitments And Contingencies [Abstract]
Number of real estate technology investment funds	8
Number of other real estate investment funds	1
Real estate technology and other real estate investments commitment funds \| $	$ 22.1

Real estate technology and other real estate investments commitment funds.

No definition available.

Name:	eqr_RealEstateTechnologyAndOtherRealEstateInvestmentsCommitmentFunds
Namespace Prefix:	eqr_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant