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Commitments to Acquire/Dispose of Real Estate (Tables) | 3 Months Ended
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Mar. 31, 2021
Commitments To Acquire Dispose Of Real Estate [Abstract] |
Acquired Properties From Unaffiliated Parties | The Company has entered into an agreement to acquire the following (purchase price in thousands):
|  | Properties |  |  | Apartment Units |  |  | Purchase Price |
Rental Properties - Consolidated |  |  | 1 |  |  |  | 280 |  |  | $ | 95,200 |
Total |  |  | 1 |  |  |  | 280 |  |  | $ | 95,200 |
Agreements to Dispose | The Company has entered into separate agreements to dispose of the following (sales price and net book value in thousands):
|  | Properties |  |  | Apartment Units |  |  | Sales Price |  |  | Net Book Value at March 31, 2021 |
Rental Properties - Consolidated |  |  | 2 |  |  |  | 340 |  |  | $ | 240,000 |  |  | $ | 139,411 |
Total |  |  | 2 |  |  |  | 340 |  |  | $ | 240,000 |  |  | $ | 139,411 |

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- Definition Discloses properties and associated units that the Company purchased from unaffiliated parties as well as purchase price. + References No definition available. + Details
Name: | eqr_AcquiredPropertiesTableTextBlockTableTextBlock
Namespace Prefix: | eqr_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

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- Definition Commitments to Acquire/Dispose of Real Estate. + References No definition available. + Details
Name: | eqr_CommitmentsToAcquireDisposeOfRealEstateAbstract
Namespace Prefix: | eqr_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Breakdown of rental properties, units and land parcels to be disposed of subsequent to the balance sheet date per separate agreements entered into prior to the balance sheet date. + References No definition available. + Details
Name: | eqr_RealEstateToBeDisposedOfTableTextBlock
Namespace Prefix: | eqr_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration