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Earnings Per Share | 12 Months Ended
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Dec. 31, 2016
Earnings Per Share [Abstract] |
Earnings Per Share And Earnings Per Unit [Text Block] | 10. Earnings Per Share and Earnings Per Unit Equity Residential The following tables set forth the computation of net income per share – basic and net income per share – diluted for the Company (amounts in thousands except per share amounts):
| Year Ended December 31,
| 2016 |  | 2015 |  | 2014
Numerator for net income per share – basic: |  |  |  |  |  |  |  |
Income from continuing operations | $ | 4,479,586 |  |  | $ | 907,621 |  |  | $ | 657,101 |
Allocation to Noncontrolling Interests – Operating Partnership, net | (171,491 | ) |  | (34,226 | ) |  | (24,771 | )
Net (income) attributable to Noncontrolling Interests – Partially Owned Properties | (16,430 | ) |  | (3,657 | ) |  | (2,544 | )
Preferred distributions | (3,091 | ) |  | (3,357 | ) |  | (4,145 | )
Premium on redemption of Preferred Shares | — |  |  | (3,486 | ) |  | — |
Income from continuing operations available to Common Shares, net of Noncontrolling Interests | 4,288,574 |  |  | 862,895 |  |  | 625,641 |
Discontinued operations, net of Noncontrolling Interests | 498 |  |  | 382 |  |  | 1,522 |
Numerator for net income per share – basic | $ | 4,289,072 |  |  | $ | 863,277 |  |  | $ | 627,163 |
Numerator for net income per share – diluted: |  |  |  |  |
Income from continuing operations | $ | 4,479,586 |  |  | $ | 907,621 |  |  | $ | 657,101 |
Net (income) attributable to Noncontrolling Interests – Partially Owned Properties | (16,430 | ) |  | (3,657 | ) |  | (2,544 | )
Preferred distributions | (3,091 | ) |  | (3,357 | ) |  | (4,145 | )
Premium on redemption of Preferred Shares | — |  |  | (3,486 | ) |  | — |
Income from continuing operations available to Common Shares | 4,460,065 |  |  | 897,121 |  |  | 650,412 |
Discontinued operations, net | 518 |  |  | 397 |  |  | 1,582 |
Numerator for net income per share – diluted | $ | 4,460,583 |  |  | $ | 897,518 |  |  | $ | 651,994 |
Denominator for net income per share – basic and diluted: |  |  |  |  |
Denominator for net income per share – basic | 365,002 |  |  | 363,498 |  |  | 361,181 |
Effect of dilutive securities: |  |  |  |  |
OP Units | 13,827 |  |  | 13,576 |  |  | 13,718 |
Long-term compensation shares/units | 3,163 |  |  | 3,546 |  |  | 2,836 |
Denominator for net income per share – diluted | 381,992 |  |  | 380,620 |  |  | 377,735 |
Net income per share – basic | $ | 11.75 |  |  | $ | 2.37 |  |  | $ | 1.74 |
Net income per share – diluted | $ | 11.68 |  |  | $ | 2.36 |  |  | $ | 1.73 |
Net income per share – basic: |  |  |  |  |  |  |  |
Income from continuing operations available to Common Shares, net of Noncontrolling Interests | $ | 11.75 |  |  | $ | 2.37 |  |  | $ | 1.73 |
Discontinued operations, net of Noncontrolling Interests | — |  |  | — |  |  | 0.01 |
Net income per share – basic | $ | 11.75 |  |  | $ | 2.37 |  |  | $ | 1.74 |
Net income per share – diluted: |  |  |  |  |  |  |  |
Income from continuing operations available to Common Shares | $ | 11.68 |  |  | $ | 2.36 |  |  | $ | 1.72 |
Discontinued operations, net | — |  |  | — |  |  | 0.01 |
Net income per share – diluted | $ | 11.68 |  |  | $ | 2.36 |  |  | $ | 1.73 |
Note: For additional disclosures regarding the employee share options and restricted shares, see Notes 2 and 12. ERP Operating Limited Partnership The following tables set forth the computation of net income per Unit – basic and net income per Unit – diluted for the Operating Partnership (amounts in thousands except per Unit amounts):
| Year Ended December 31,
| 2016 |  | 2015 |  | 2014
Numerator for net income per Unit – basic and diluted: |  |  |  |  |  |  |  |
Income from continuing operations | $ | 4,479,586 |  |  | $ | 907,621 |  |  | $ | 657,101 |
Net (income) attributable to Noncontrolling Interests – Partially Owned Properties | (16,430 | ) |  | (3,657 | ) |  | (2,544 | )
Allocation to Preference Units | (3,091 | ) |  | (3,357 | ) |  | (4,145 | )
Allocation to premium on redemption of Preference Units | — |  |  | (3,486 | ) |  | — |
Income from continuing operations available to Units | 4,460,065 |  |  | 897,121 |  |  | 650,412 |
Discontinued operations, net | 518 |  |  | 397 |  |  | 1,582 |
Numerator for net income per Unit – basic and diluted | $ | 4,460,583 |  |  | $ | 897,518 |  |  | $ | 651,994 |
Denominator for net income per Unit – basic and diluted: |  |  |  |  |
Denominator for net income per Unit – basic | 378,829 |  |  | 377,074 |  |  | 374,899 |
Effect of dilutive securities: |  |  |  |  |
Dilution for Units issuable upon assumed exercise/vesting of the Company's long-term compensation shares/units | 3,163 |  |  | 3,546 |  |  | 2,836 |
Denominator for net income per Unit – diluted | 381,992 |  |  | 380,620 |  |  | 377,735 |
Net income per Unit – basic | $ | 11.75 |  |  | $ | 2.37 |  |  | $ | 1.74 |
Net income per Unit – diluted | $ | 11.68 |  |  | $ | 2.36 |  |  | $ | 1.73 |
Net income per Unit – basic: |  |  |  |  |  |  |  |
Income from continuing operations available to Units | $ | 11.75 |  |  | $ | 2.37 |  |  | $ | 1.73 |
Discontinued operations, net | — |  |  | — |  |  | 0.01 |
Net income per Unit – basic | $ | 11.75 |  |  | $ | 2.37 |  |  | $ | 1.74 |
Net income per Unit – diluted: |  |  |  |  |  |  |  |
Income from continuing operations available to Units | $ | 11.68 |  |  | $ | 2.36 |  |  | $ | 1.72 |
Discontinued operations, net | — |  |  | — |  |  | 0.01 |
Net income per Unit – diluted | $ | 11.68 |  |  | $ | 2.36 |  |  | $ | 1.73 |
Note: For additional disclosures regarding the employee share options and restricted shares, see Notes 2 and 12.

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