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Real Estate (Tables) | 12 Months Ended
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Dec. 31, 2015
Schedule Of Real Estate Investments And Accumulated Depreciation [Table Text Block] | The following table summarizes the carrying amounts for the Company’s investment in real estate (at cost) as of December 31, 2015 and 2014 (amounts in thousands):
|  | 2015 |  | 2014
Land |  | $ | 5,864,046 |  |  | $ | 6,295,404 |
Depreciable property: |  |  |  |  |  |
Buildings and improvements |  | 16,336,829 |  |  | 17,974,337 |
Furniture, fixtures and equipment |  | 1,207,098 |  |  | 1,365,276 |
In-Place lease intangibles |  | 483,160 |  |  | 511,891 |
Projects under development: |  |  |  |  |  |
Land |  | 284,995 |  |  | 466,764 |
Construction-in-progress |  | 837,381 |  |  | 877,155 |
Land held for development: |  |  |  |  |  |
Land |  | 120,007 |  |  | 145,366 |
Construction-in-progress |  | 48,836 |  |  | 39,190 |
Investment in real estate |  | 25,182,352 |  |  | 27,675,383 |
Accumulated depreciation |  | (4,905,406 | ) |  | (5,432,805 | )
Investment in real estate, net |  | $ | 20,276,946 |  |  | $ | 22,242,578 |
Schedule of Finite-Lived Intangible Assets [Table Text Block] | The following table summarizes the carrying amounts for the Company's above and below market ground and retail lease intangibles as of December 31, 2015 and 2014 (amounts in thousands):
Description |  | Balance Sheet Location |  | 2015 |  | 2014
Assets |  |  |  |  |  |
Ground lease intangibles – below market |  | Other Assets |  | $ | 178,251 |  |  | $ | 178,251 |
Retail lease intangibles – above market |  | Other Assets |  | 1,260 |  |  | 1,260 |
Lease intangible assets |  |  |  | 179,511 |  |  | 179,511 |
Accumulated amortization |  |  |  | (13,451 | ) |  | (8,913 | )
Lease intangible assets, net |  |  |  | $ | 166,060 |  |  | $ | 170,598 |
Liabilities |  |  |  |  |  |
Ground lease intangibles – above market |  | Other Liabilities |  | $ | 2,400 |  |  | $ | 2,400 |
Retail lease intangibles – below market |  | Other Liabilities |  | 5,270 |  |  | 5,270 |
Lease intangible liabilities |  |  |  | 7,670 |  |  | 7,670 |
Accumulated amortization |  |  |  | (3,414 | ) |  | (2,258 | )
Lease intangible liabilities, net |  |  |  | $ | 4,256 |  |  | $ | 5,412 |
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block] | The following table provides a summary of the aggregate amortization expense for above and below market ground lease intangibles and retail lease intangibles for each of the next five years (amounts in thousands):
|  | 2016 |  | 2017 |  | 2018 |  | 2019 |  | 2020
Ground lease intangibles |  | $ | 4,321 |  |  | $ | 4,321 |  |  | $ | 4,321 |  |  | $ | 4,321 |  |  | $ | 4,321 |
Retail lease intangibles |  | (896 | ) |  | (540 | ) |  | (71 | ) |  | (71 | ) |  | (71 | )
Total |  | $ | 3,425 |  |  | $ | 3,781 |  |  | $ | 4,250 |  |  | $ | 4,250 |  |  | $ | 4,250 |
Acquired Properties Table | During the year ended December 31, 2014, the Company acquired the entire equity interest in the following from unaffiliated parties (purchase price in thousands):
|  | Properties |  | Apartment Units |  | Purchase Price
Rental Properties – Consolidated (1) |  | 6 |  |  | 1,353 |  |  | $ | 469,850 |
Land Parcels |  | — |  |  | — |  |  | 28,790 |
Total |  | 6 |  |  | 1,353 |  |  | $ | 498,640 |
(1) | Purchase price includes an allocation of approximately $95.3 million to land and $374.6 million to depreciable property.
During the year ended December 31, 2015, the Company acquired the entire equity interest in the following from unaffiliated parties (purchase price in thousands):
|  | Properties |  | Apartment Units |  | Purchase Price
Rental Properties – Consolidated (1) |  | 4 |  |  | 625 |  |  | $ | 296,037 |
Land Parcels (2) |  | — |  |  | — |  |  | 27,800 |
Total |  | 4 |  |  | 625 |  |  | $ | 323,837 |
(1) | Purchase price includes an allocation of approximately $44.7 million to land and $251.3 million to depreciable property.
(2) | The Company acquired three contiguous land parcels in San Francisco during 2015 which will be combined for future development.
Disposed Properties Table | During the year ended December 31, 2015, the Company disposed of the following to unaffiliated parties (sales price in thousands):
|  | Properties |  | Apartment Units |  | Sales Price
Consolidated: |  |  |  |  |  |
Rental Properties (1) |  | 8 |  |  | 1,857 |  |  | $ | 513,312 |
Total |  | 8 |  |  | 1,857 |  |  | $ | 513,312 |
(1) | Includes a 193,230 square foot medical office building adjacent to our Longfellow Place property in Boston with a sales price of approximately $123.3 million which is not included in the Company's property and apartment unit counts.
During the year ended December 31, 2014, the Company disposed of the following to unaffiliated parties (sales price in thousands):
|  | Properties |  | Apartment Units |  | Sales Price
Consolidated: |  |  |  |  |  |
Rental Properties |  | 10 |  |  | 3,092 |  |  | $ | 466,968 |
Land Parcels (three) |  | — |  |  | — |  |  | 62,602 |
Unconsolidated: |  |  |  |  |  |
Rental Properties (1) |  | 1 |  |  | 388 |  |  | 62,500 |
Total |  | 11 |  |  | 3,480 |  |  | $ | 592,070 |
(1) | The Company owned an 85% interest in this unconsolidated rental property. Sale price listed is the gross sale price.
Schedule Of Properties And Units [Table Text Block] | The ownership breakdown includes (table does not include various uncompleted development properties):
|  | Properties |  | Apartment Units
Wholly Owned Properties |  | 367 |  |  | 98,608 |
Master-Leased Properties – Consolidated |  | 3 |  |  | 853 |
Partially Owned Properties – Consolidated |  | 19 |  |  | 3,771 |
Partially Owned Properties – Unconsolidated |  | 3 |  |  | 1,281 |
Military Housing |  | 2 |  |  | 5,139 |
|  | 394 |  |  | 109,652 |
Schedule of Recognized Identified Assets Acquired and Liabilities Assumed [Table Text Block] | The following table summarizes the acquisition date fair values of the assets acquired and liabilities assumed, which the Company determined using Level 1, Level 2 and Level 3 inputs (amounts in thousands):
Land |  | $ | 2,239,000 |
Depreciable property: |  |
Buildings and improvements |  | 5,765,538 |
Furniture, fixtures and equipment |  | 61,470 |
In-Place lease intangibles |  | 304,830 |
Projects under development |  | 36,583 |
Land held for development |  | 244,097 |
Investments in unconsolidated entities |  | 230,608 |
Other assets |  | 195,260 |
Other liabilities |  | (108,997 | )
Net assets acquired |  | $ | 8,968,389 |
Schedule of Finite-Lived Intangible Assets Acquired as Part of Business Combination [Table Text Block] | The following table summarizes the acquisition date fair values of the above and below market ground and retail lease intangibles, which we determined using Level 2 and Level 3 inputs (amounts in thousands):
Description |  | Balance Sheet Location |  | Fair Value
Ground lease intangibles – below market |  | Other Assets |  | $ | 178,251 |
Retail lease intangibles – above market |  | Other Assets |  | 1,260 |
Ground lease intangibles – above market |  | Other Liabilities |  | 2,400 |
Retail lease intangibles – below market |  | Other Liabilities |  | 8,040 |
Business Acquisition, Pro Forma Information [Table Text Block] | The following table illustrates the effect on net income, earnings per share – basic and earnings per share – diluted as if the Company had consummated the Archstone Acquisition as of January 1, 2012 (amounts in thousands, except per share amounts):
|  | Year Ended December 31, 2013
Total revenues |  | $ | 2,485,438 |
Income from continuing operations |  | 203,286 |
Discontinued operations, net |  | 2,074,072 |
Net income |  | 2,277,358 |
Net income available to Common Shares |  | 2,183,756 |
Earnings per share - basic: |  |
Net income available to Common Shares |  | $ | 6.07 |
Weighted average Common Shares outstanding (1) |  | 359,688 |
Earnings per share - diluted: |  |
Net income available to Common Shares |  | $ | 6.05 |
Weighted average Common Shares outstanding (1) |  | 375,861 |
(1) | Includes an adjustment for Common Shares issued to the public in November/December 2012 and to an affiliate of Lehman Brothers Holdings Inc. in February 2013 as partial consideration for the Archstone Acquisition.
ERPOP [Member] |
Business Acquisition, Pro Forma Information [Table Text Block] | The following table illustrates the effect on net income, earnings per Unit – basic and earnings per Unit – diluted as if the Operating Partnership had consummated the Archstone Acquisition as of January 1, 2012 (amounts in thousands, except per Unit amounts):
|  | Year Ended December 31, 2013
Total revenues |  | $ | 2,485,438 |
Income from continuing operations |  | 203,286 |
Discontinued operations, net |  | 2,074,072 |
Net income |  | 2,277,358 |
Net income available to Units |  | 2,273,798 |
Earnings per Unit - basic: |  |
Net income available to Units |  | $ | 6.07 |
Weighted average Units outstanding (1) |  | 373,421 |
Earnings per Unit - diluted: |  |
Net income available to Units |  | $ | 6.05 |
Weighted average Units outstanding (1) |  | 375,861 |
(1) | Includes an adjustment for Common Shares issued to the public in November/December 2012 and to an affiliate of Lehman Brothers Holdings Inc. in February 2013 as partial consideration for the Archstone Acquisition. Concurrent with these transactions, ERPOP issued the same number of OP Units to EQR.
Starwood Portfolio [Member] |
Schedule Of Real Estate Investments And Accumulated Depreciation [Table Text Block] | In accordance with this classification, the Company ceased depreciation on all assets in the Starwood portfolio as of November 1, 2015 and the following assets are classified as held for sale in the accompanying consolidated balance sheets at December 31, 2015 (amounts in thousands):
|  | 2015
Land |  | $ | 602,737 |
Depreciable property: |  |
Buildings and improvements |  | 2,386,489 |
Furniture, fixtures and equipment |  | 335,565 |
In-Place lease intangibles |  | 35,554 |
Real estate held for sale before accumulated depreciation |  | 3,360,345 |
Accumulated depreciation |  | (1,179,210 | )
Real estate held for sale |  | $ | 2,181,135 |
Schedule Of Properties And Units [Table Text Block] | The following table provides the operating segments/locations of the properties and apartment units sold in the Starwood Transaction, which represents substantially all of the assets in the Company's non-core South Florida and Denver markets and certain non-core assets in the Washington D.C., Seattle and other (Inland Empire, CA) markets. The sale of these properties represents the continuation of the Company's long-term strategy of investing in high barrier to entry/core urban markets. See Notes 11 and 18 for further discussion.
Markets/Metro Areas |  | Properties |  | Apartment Units
Non-core – South Florida |  | 33 |  |  | 10,742 |
Non-core – Denver |  | 18 |  |  | 6,635 |
Washington D.C. |  | 10 |  |  | 3,020 |
Seattle |  | 8 |  |  | 1,721 |
Non-core – other (Inland Empire, CA) |  | 3 |  |  | 1,144 |
Total |  | 72 |  |  | 23,262 |

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