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Equity, Capital and Other Interests (Tables) | 12 Months Ended
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Dec. 31, 2020
Class Of Stock [Line Items] |
Changes in Issued and Outstanding Common Shares and Units | The following table presents the changes in the Company’s issued and outstanding Common Shares and Units for the years ended December 31, 2020, 2019 and 2018:
|  | 2020 |  |  | 2019 |  |  | 2018 |
Common Shares |  |  |  |  |  |  |  |  |  |  |  |
Common Shares outstanding at January 1, |  |  | 371,670,884 |  |  |  | 369,405,161 |  |  |  | 368,018,082 |
Common Shares Issued: |  |  |  |  |  |  |  |  |  |  |  |
Conversion of OP Units |  |  | 122,505 |  |  |  | 313,940 |  |  |  | 131,477 |
Exercise of share options |  |  | 239,695 |  |  |  | 1,745,050 |  |  |  | 1,056,388 |
Employee Share Purchase Plan (ESPP) |  |  | 90,196 |  |  |  | 48,131 |  |  |  | 75,414 |
Restricted share grants, net |  |  | 178,720 |  |  |  | 158,602 |  |  |  | 123,800 |
Common Shares outstanding at December 31, |  |  | 372,302,000 |  |  |  | 371,670,884 |  |  |  | 369,405,161 |
Units |  |  |  |  |  |  |  |  |  |  |  |
Units outstanding at January 1, |  |  | 13,731,315 |  |  |  | 13,904,035 |  |  |  | 13,768,438 |
Restricted unit grants, net |  |  | 249,263 |  |  |  | 141,220 |  |  |  | 267,074 |
Conversion of OP Units to Common Shares |  |  | (122,505 | ) |  |  | (313,940 | ) |  |  | (131,477 | )
Units outstanding at December 31, |  |  | 13,858,073 |  |  |  | 13,731,315 |  |  |  | 13,904,035 |
Total Common Shares and Units outstanding at December 31, |  |  | 386,160,073 |  |  |  | 385,402,199 |  |  |  | 383,309,196 |
Units Ownership Interest in Operating Partnership |  |  | 3.6 | % |  |  | 3.6 | % |  |  | 3.6 | %
Changes in Redemption Value of Redeemable Noncontrolling Interests - Operating Partnership/Redeemable Limited Partners | The following table presents the changes in the redemption value of the Redeemable Noncontrolling Interests – Operating Partnership/Redeemable Limited Partners for the years ended December 31, 2020, 2019 and 2018, respectively (amounts in thousands):
|  | 2020 |  |  | 2019 |  |  | 2018 |
Balance at January 1, |  | $ | 463,400 |  |  | $ | 379,106 |  |  | $ | 366,955 |
Change in market value |  |  | (125,224 | ) |  |  | 82,283 |  |  |  | 13,922 |
Change in carrying value |  |  | 775 |  |  |  | 2,011 |  |  |  | (1,771 | )
Balance at December 31, |  | $ | 338,951 |  |  | $ | 463,400 |  |  | $ | 379,106 |
Issued and Outstanding Preferred Shares and Preference Units | The following table presents the Company’s issued and outstanding Preferred Shares/Preference Units as of December 31, 2020 and 2019:
|  |  |  |  |  |  |  | Amounts in thousands |
|  |  |  | Annual |  |  |  |  |  |  |  |  |
|  | Call |  | Dividend Per |  |  | December 31, |  |  | December 31, |
|  | Date (1) |  | Share/Unit (2) |  |  | 2020 |  |  | 2019 |
Preferred Shares/Preference Units of beneficial interest, $0.01 par value; 100,000,000 shares authorized: |  |  |  |  |  |  |  |  |  |  |  |  |  |
8.29% Series K Cumulative Redeemable Preferred Shares/Preference Units; liquidation value $50 per share/unit; 745,600 shares/units issued and outstanding as of December 31, 2020 and 2019 |  | 12/10/26 |  | $ | 4.145 |  |  | $ | 37,280 |  |  | $ | 37,280 |
|  |  |  |  |  |  |  | $ | 37,280 |  |  | $ | 37,280 |
(1) | On or after the call date, redeemable Preferred Shares/Preference Units may be redeemed for cash at the option of the Company or the Operating Partnership, respectively, in whole or in part, at a redemption price equal to the liquidation price per share/unit, plus accrued and unpaid distributions, if any.
(2) | Dividends on Preferred Shares/Preference Units are payable quarterly.
ERPOP [Member] |
Class Of Stock [Line Items] |
Changes in Issued and Outstanding Common Shares and Units | The following table presents the changes in the Operating Partnership’s issued and outstanding General Partner Units and Limited Partner Units for the years ended December 31, 2020, 2019 and 2018:
|  | 2020 |  |  | 2019 |  |  | 2018 |
General and Limited Partner Units |  |  |  |  |  |  |  |  |  |  |  |
General and Limited Partner Units outstanding at January 1, |  |  | 385,402,199 |  |  |  | 383,309,196 |  |  |  | 381,786,520 |
Issued to General Partner: |  |  |  |  |  |  |  |  |  |  |  |
Exercise of EQR share options |  |  | 239,695 |  |  |  | 1,745,050 |  |  |  | 1,056,388 |
EQR’s Employee Share Purchase Plan (ESPP) |  |  | 90,196 |  |  |  | 48,131 |  |  |  | 75,414 |
EQR’s restricted share grants, net |  |  | 178,720 |  |  |  | 158,602 |  |  |  | 123,800 |
Issued to Limited Partners: |  |  |  |  |  |  |  |  |  |  |  |
Restricted unit grants, net |  |  | 249,263 |  |  |  | 141,220 |  |  |  | 267,074 |
General and Limited Partner Units outstanding at December 31, |  |  | 386,160,073 |  |  |  | 385,402,199 |  |  |  | 383,309,196 |
Limited Partner Units |  |  |  |  |  |  |  |  |  |  |  |
Limited Partner Units outstanding at January 1, |  |  | 13,731,315 |  |  |  | 13,904,035 |  |  |  | 13,768,438 |
Limited Partner restricted unit grants, net |  |  | 249,263 |  |  |  | 141,220 |  |  |  | 267,074 |
Conversion of Limited Partner OP Units to EQR Common Shares |  |  | (122,505 | ) |  |  | (313,940 | ) |  |  | (131,477 | )
Limited Partner Units outstanding at December 31, |  |  | 13,858,073 |  |  |  | 13,731,315 |  |  |  | 13,904,035 |
Limited Partner Units Ownership Interest in Operating Partnership |  |  | 3.6 | % |  |  | 3.6 | % |  |  | 3.6 | %

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