XML 84 R64.htm IDEA: XBRL DOCUMENT
v3.8.0.1

Equity, Capital and Other Interests - Issued and Outstanding Preferred Shares and Preference Units (Parenthetical) (Details) - $ / shares | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Class Of Stock [Line Items] |  |
Preferred Stock, Par or Stated Value Per Share | $ 0.01 | $ 0.01
Preferred Stock, Shares Authorized | 100,000,000 | 100,000,000
Preferred Stock |  |
Class Of Stock [Line Items] |  |
Preferred Stock Preference Units Issued | 745,600 | 745,600
Preferred Stock Preference Units Outstanding | 745,600 | 745,600
Preferred Stock Preference Units Redemption Price Per Share | $ 50 | $ 50
Preferred Stock Preference Units Dividend Rate Percentage | 8.29% | 8.29%
Preferred Stock | ERPOP [Member] |  |
Class Of Stock [Line Items] |  |
Preferred Stock Preference Units Issued | 745,600 | 745,600
Preferred Stock Preference Units Outstanding | 745,600 | 745,600
Preferred Stock Preference Units Redemption Price Per Share | $ 50 | $ 50
Preferred Stock Preference Units Dividend Rate Percentage | 8.29% | 8.29%

X
- Definition The percentage rate used to calculate dividend payments on preferred shares/preference units. + References No definition available. + Details
Name: | eqr_PreferredStockPreferenceUnitsDividendRatePercentage
Namespace Prefix: | eqr_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Total number of preferred shares/preference units issued to security holders. May be all or portion of the number of preferred shares/preference units authorized. Excludes preferred shares/preference units that are classified as debt. + References No definition available. + Details
Name: | eqr_PreferredStockPreferenceUnitsIssued
Namespace Prefix: | eqr_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition Aggregate number of preferred shares/preference units held by security holders. Does not include preferred shares/preference units that have been repurchased. + References No definition available. + Details
Name: | eqr_PreferredStockPreferenceUnitsOutstanding
Namespace Prefix: | eqr_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition The price per share/unit at which the preferred share/preference units of the entity has priority over common shares/units in the distribution of dividends and in the event of liquidation of the entity is redeemed or may be called at. The redemption features of these preferred shares/units are solely within the control of the issuer. + References No definition available. + Details
Name: | eqr_PreferredStockPreferenceUnitsRedemptionPricePerShareUnit
Namespace Prefix: | eqr_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | instant

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 Face amount or stated value per share of preferred stock nonredeemable or redeemable solely at the option of the issuer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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_PreferredStockParOrStatedValuePerShare
Namespace Prefix: | us-gaap_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Definition The maximum number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) permitted to be issued by an entity's charter and bylaws. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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_PreferredStockSharesAuthorized
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

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

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