XML 62 R45.htm IDEA: XBRL DOCUMENT
v3.10.0.1

Equity, Capital and Other Interests - Issued and Outstanding Preferred Shares and Preference Units (Details) - USD ($) $ / shares in Units, $ in Thousands | 6 Months Ended |
--- | --- | ---
Jun. 30, 2018 | Dec. 31, 2017
Class Of Stock [Line Items] |  |
8.29% Series K Cumulative Redeemable Preferred; liquidation value $50 per share; 745,600 shares issued and outstanding as of June 30, 2018 and December 31, 2017 | $ 37,280 | $ 37,280
ERPOP [Member] |  |
Class Of Stock [Line Items] |  |
8.29% Series K Cumulative Redeemable Preferred; liquidation value $50 per share; 745,600 shares issued and outstanding as of June 30, 2018 and December 31, 2017 | $ 37,280 | 37,280
Preferred Stock |  |
Class Of Stock [Line Items] |  |
Preferred Stocks Preference Units Call Date | Dec. 10, 2026 |
Annual Dividend Per Preferred Share Preference Unit | $ 4.145 |
8.29% Series K Cumulative Redeemable Preferred; liquidation value $50 per share; 745,600 shares issued and outstanding as of June 30, 2018 and December 31, 2017 | $ 37,280 | 37,280
Preferred Stock | ERPOP [Member] |  |
Class Of Stock [Line Items] |  |
Preferred Stocks Preference Units Call Date | Dec. 10, 2026 |
Annual Dividend Per Preferred Share Preference Unit | $ 4.145 |
8.29% Series K Cumulative Redeemable Preferred; liquidation value $50 per share; 745,600 shares issued and outstanding as of June 30, 2018 and December 31, 2017 | $ 37,280 | $ 37,280

X
- Definition Aggregate dividends payable during the year for each share/unit of preferred stock/preference units outstanding. + References No definition available. + Details
Name: | eqr_AnnualDividendPerPreferredSharePreferenceUnit
Namespace Prefix: | eqr_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

X
- Definition Preferred stocks preference units call date. + References No definition available. + Details
Name: | eqr_PreferredStocksPreferenceUnitsCallDate
Namespace Prefix: | eqr_
Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_ClassOfStockLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Value of all nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) held by shareholders, which is net of related treasury stock. May be all or a portion of the number of preferred shares authorized. These shares represent the ownership interest of the preferred shareholders. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_PreferredStockValueOutstanding
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | dei_LegalEntityAxis=eqr_ERPOPMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementEquityComponentsAxis=us-gaap_PreferredStockMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |