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Other (Details) - shares | Jun. 30, 2016 | Mar. 31, 2016
--- | --- | ---
Additional Common Shares Authorized | 13,000,000 |
Stock Repurchase Program, Number of Shares Authorized to be Repurchased | 13,000,000 |
Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased | 13,000,000 | 12,968,760

X
- Definition Represents the remaining number of shares to be issued into the existing trading market at current market prices as well as through negotiated transactions under the Company's at-the-market share offering program. + References No definition available. + Details
Name: | eqr_AdditionalCommonSharesAuthorized
Namespace Prefix: | eqr_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition The number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan. + References No definition available. + Details
Name: | us-gaap_StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition The remaining number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan. + References No definition available. + Details
Name: | us-gaap_StockRepurchaseProgramRemainingNumberOfSharesAuthorizedToBeRepurchased
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant