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Real Estate - Additional Information (Details) $ in Millions	9 Months Ended
	Sep. 30, 2025 USD ($) ApartmentUnit
Percentage interest in consolidated operating property	10.00%
Property Units Acquired | ApartmentUnit	270
Real estate basis on consolidation	$ 88.4
Land [Member]
Real estate basis on consolidation	8.5
Depreciable Property [Member]
Real estate basis on consolidation	$ 79.9

X

- Definition

Percentage interest acquired in consolidated operating property.

+ References

No definition available.

+ Details

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

X

- Definition

Property acquired consolidation value.

+ References

No definition available.

+ Details

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

X

- Definition

Total number of units associated with the property or properties acquired from unaffiliated third parties during the period.

+ References

No definition available.

+ Details

Name:	eqr_PropertyUnitsAcquired
Namespace Prefix:	eqr_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_LandMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_PropertyPlantAndEquipmentByTypeAxis=eqr_DepreciablePropertyMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: