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Leases - Summary of Reconciliation of Lease Liabilities (Details) $ in Thousands	Sep. 30, 2019 USD ($)
Leases [Abstract]
Total minimum rent payments	$ 1,102,359
Less: Lease discount	769,047
Lease liabilities	$ 333,312

X

- Definition

Lessee operating and financing lease liability payments due.

+ References

No definition available.

+ Details

Name:	eqr_LesseeOperatingAndFinancingLeaseLiabilityPaymentsDue
Namespace Prefix:	eqr_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Lessee operating and financing lease liability undiscounted excess amount.

+ References

No definition available.

+ Details

Name:	eqr_LesseeOperatingAndFinancingLeaseLiabilityUndiscountedExcessAmount
Namespace Prefix:	eqr_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Operating and financing lease liability.

+ References

No definition available.

+ Details

Name:	eqr_OperatingAndFinancingLeaseLiability
Namespace Prefix:	eqr_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- References

No definition available.

+ Details

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