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Commitments and Contingencies - Additional Information (Details) $ in Millions	9 Months Ended
	Sep. 30, 2019 USD ($) Property ApartmentUnit
Commitments And Contingencies [Abstract]
Projects in various stages of development	2
Partially owned projects in various stages of development	1
Units in various stages of development | ApartmentUnit	824
Consolidated project under development commitment fund | $	$ 459.4
Various stages of development with estimated completion dates ranging through September 30, 2021	Sep. 30, 2021

X

- Definition

Commitments and Contingencies.

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No definition available.

+ Details

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Namespace Prefix:	eqr_
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- Definition

Represents the company's remaining funding obligation (i.e. total project costs less book value) for consolidated projects that are under development.

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No definition available.

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

X

- Definition

Number of partially owned projects in various stages of development.

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No definition available.

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Namespace Prefix:	eqr_
Data Type:	xbrli:integerItemType
Balance Type:	na
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X

- Definition

Total number of open development projects. May include projects that are held for and/or under development, completed and not stabilized or completed and stabilized. These projects are consolidated.

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No definition available.

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Data Type:	xbrli:integerItemType
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X

- Definition

Total number of units that are associated with open development projects. May include projects that are held for and/or under development, completed and not stabilized or completed and stabilized. These units are consolidated.

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No definition available.

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Namespace Prefix:	eqr_
Data Type:	xbrli:integerItemType
Balance Type:	na
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X

- Definition

Represents the latest completion date for the current projects under development.

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No definition available.

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Name:	eqr_VariousStagesOfDevelopmentDateMaturity
Namespace Prefix:	eqr_
Data Type:	xbrli:dateItemType
Balance Type:	na
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