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Fair Value Measurements - Summarizes Company's Consolidated Derivative Instruments (Details) - Forward Starting Swaps [Member] $ in Thousands | 3 Months Ended
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Mar. 31, 2023 USD ($)
Derivatives Fair Value [Line Items] |
Current Notional Balance | $ 450,000
Maturity Date | 2033
Minimum [Member] |
Derivatives Fair Value [Line Items] |
Interest Rate | 2.447%
Maximum [Member] |
Derivatives Fair Value [Line Items] |
Interest Rate | 3.6995%

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- Definition Derivative maturity year. + References No definition available. + Details
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Namespace Prefix: | eqr_
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Balance Type: | na
Period Type: | duration

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- Definition Fixed interest rate related to the interest rate derivative. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition Nominal or face amount used to calculate payment on derivative. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI https://asc.fasb.org/extlink&oid=125515794&loc=SL5580258-113959 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI https://asc.fasb.org/extlink&oid=125515794&loc=SL5579245-113959 + Details
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Balance Type: | na
Period Type: | instant

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

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- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |