XML 35 R17.htm IDEA: XBRL DOCUMENT
v3.10.0.1

Commitments to Acquire/Dispose of Real Estate | 9 Months Ended
--- | ---
Sep. 30, 2018
Commitments To Acquire Dispose Of Real Estate [Abstract] |
Commitments to Acquire/Dispose of Real Estate |
5. | Commitments to Acquire/Dispose of Real Estate
The Company has not entered into any separate agreements to acquire or dispose of rental properties or land parcels as of October 26, 2018.

X
- 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

X
- Definition Disclosure of acquisition/disposition transactions with closing dates subsequent to the balance sheet date for which the Company had entered into separate agreements prior to the balance sheet date. The closing of these transactions is subject to certain conditions and restrictions such that there can be no assurance that these transactions will be consummated or that the final terms will not differ in material respects from the original agreements. + References No definition available. + Details
Name: | eqr_CommitmentsToAcquireDisposeOfRealEstateTextBlock
Namespace Prefix: | eqr_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration