XML 95 R76.htm IDEA: XBRL DOCUMENT
v3.20.4

Leases - Summary of Residential and Non-Residential Accounts Receivable and Straight-Line Receivable Balances (Parenthetical) (Details) | Dec. 31, 2020
--- | ---
Leases [Abstract] |
Holding percentage of residential security deposits of net receivable | 31.60%

X
- Definition Holding percentage of residential security deposits of net receivable. + References No definition available. + Details
Name: | eqr_HoldingPercentageOfResidentialSecurityDepositsOfNetReceivable
Namespace Prefix: | eqr_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- References No definition available. + Details
Name: | us-gaap_LeasesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration