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Real Estate and Lease Intangibles - Additional Information (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Ground Lease [Member] |  |  |  |
Land held for development: |  |  |  |
Amortization of above/below market leases | $ 1.1 | $ 1.1 | $ 2.2 | $ 2.2
Retail Lease [Member] |  |  |  |
Land held for development: |  |  |  |
Amortization of above/below market leases | $ 0.3 | $ 0.3 | $ 0.5 | $ 0.5

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- Definition Land held for development [Abstract] + References No definition available. + Details
Name: | eqr_LandheldfordevelopmentAbstract
Namespace Prefix: | eqr_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of non-cash amortization of intangible asset (liability) for above and below market leases. + References No definition available. + Details
Name: | us-gaap_AmortizationOfAboveAndBelowMarketLeases
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | us-gaap_LeaseArrangementTypeAxis=eqr_GroundLeaseMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LeaseArrangementTypeAxis=eqr_RetailLeaseMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |