XML 93 R78.htm IDEA: XBRL DOCUMENT
v3.23.1

Fair Value Measurements - Summary of Fair Value Measurements for Each Major Category of Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands | Mar. 31, 2023 | Dec. 31, 2022 | Mar. 31, 2022 | Dec. 31, 2021
--- | --- | --- | --- | ---
Derivatives Fair Value [Line Items] |  |  |  |
Other Assets, Fair Value Disclosure | $ 139,327 | $ 155,109 |  |
Derivative Asset, Statement of Financial Position [Extensible Enumeration] | Other assets |  |  |
Other Liabilities, Fair Value Disclosure | $ 128,452 | 134,455 |  |
Derivative Liability, Statement of Financial Position [Extensible Enumeration] | Other liabilities |  |  |
Redeemable Noncontrolling Interests - Operating Partnership/Redeemable Limited Partners | $ 323,551 | 318,273 | $ 495,760 | $ 498,977
Forward Starting Swaps [Member] |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |
Other Assets, Fair Value Disclosure | 14,455 | 21,864 |  |
Other Liabilities, Fair Value Disclosure | 3,580 | 1,210 |  |
SERP [Member] |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |
Other Assets, Fair Value Disclosure | 124,872 | 133,245 |  |
Other Liabilities, Fair Value Disclosure | 124,872 | 133,245 |  |
Fair Value, Inputs, Level 1 [Member] |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |
Other Assets, Fair Value Disclosure | 124,872 | 133,245 |  |
Other Liabilities, Fair Value Disclosure | 124,872 | 133,245 |  |
Redeemable Noncontrolling Interests - Operating Partnership/Redeemable Limited Partners | 0 | 0 |  |
Fair Value, Inputs, Level 1 [Member] | Forward Starting Swaps [Member] |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |
Other Assets, Fair Value Disclosure | 0 | 0 |  |
Other Liabilities, Fair Value Disclosure | 0 | 0 |  |
Fair Value, Inputs, Level 1 [Member] | SERP [Member] |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |
Other Assets, Fair Value Disclosure | 124,872 | 133,245 |  |
Other Liabilities, Fair Value Disclosure | 124,872 | 133,245 |  |
Fair Value, Inputs, Level 2 [Member] |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |
Other Assets, Fair Value Disclosure | 14,455 | 21,864 |  |
Other Liabilities, Fair Value Disclosure | 3,580 | 1,210 |  |
Redeemable Noncontrolling Interests - Operating Partnership/Redeemable Limited Partners | 323,551 | 318,273 |  |
Fair Value, Inputs, Level 2 [Member] | Forward Starting Swaps [Member] |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |
Other Assets, Fair Value Disclosure | 14,455 | 21,864 |  |
Other Liabilities, Fair Value Disclosure | 3,580 | 1,210 |  |
Fair Value, Inputs, Level 2 [Member] | SERP [Member] |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |
Other Assets, Fair Value Disclosure | 0 | 0 |  |
Other Liabilities, Fair Value Disclosure | 0 | 0 |  |
Fair Value, Inputs, Level 3 [Member] |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |
Other Assets, Fair Value Disclosure | 0 | 0 |  |
Other Liabilities, Fair Value Disclosure | 0 | 0 |  |
Redeemable Noncontrolling Interests - Operating Partnership/Redeemable Limited Partners | 0 | 0 |  |
Fair Value, Inputs, Level 3 [Member] | Forward Starting Swaps [Member] |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |
Other Assets, Fair Value Disclosure | 0 | 0 |  |
Other Liabilities, Fair Value Disclosure | 0 | 0 |  |
Fair Value, Inputs, Level 3 [Member] | SERP [Member] |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |
Other Assets, Fair Value Disclosure | 0 | 0 |  |
Other Liabilities, Fair Value Disclosure | $ 0 | $ 0 |  |

X
- Definition The greater of carrying value (book value) or fair market value of an entity's issued and outstanding stock which is not included within permanent equity in Stockholders Equity. Temporary equity is a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable. Includes any type of security that is redeemable at a fixed or determinable price or on a fixed or determinable date or dates, is redeemable at the option of the holder, or has conditions for redemption which are not solely within the control of the issuer. If convertible, the issuer does not control the actions or events necessary to issue the maximum number of shares that could be required to be delivered under the conversion option if the holder exercises the option to convert the stock to another class of equity. + References No definition available. + Details
Name: | eqr_RedeemableNoncontrollingInterestsOperatingPartnership
Namespace Prefix: | eqr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Indicates line item in statement of financial position that includes derivative asset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=125515794&loc=SL5618551-113959 + Details
Name: | us-gaap_DerivativeAssetStatementOfFinancialPositionExtensibleEnumeration
Namespace Prefix: | us-gaap_
Data Type: | enum2:enumerationSetItemType
Balance Type: | na
Period Type: | instant

X
- Definition Indicates line item in statement of financial position that includes derivative liability. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=125515794&loc=SL5618551-113959 + Details
Name: | us-gaap_DerivativeLiabilityStatementOfFinancialPositionExtensibleEnumeration
Namespace Prefix: | us-gaap_
Data Type: | enum2:enumerationSetItemType
Balance Type: | na
Period Type: | instant

X
- 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
Name: | us-gaap_DerivativesFairValueLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Fair value portion of other assets. + References No definition available. + Details
Name: | us-gaap_OtherAssetsFairValueDisclosure
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Fair value portion of other liabilities. + References No definition available. + Details
Name: | us-gaap_OtherLiabilitiesFairValueDisclosure
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=eqr_ForwardStartingSwapsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=eqr_SerpMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel1Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel2Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel3Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |