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Earnings per Common Share (Tables) | 3 Months Ended
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Mar. 31, 2021
Earnings Per Share [Abstract] |
Computation of basic and diluted earnings per common share |
Computation of basic and diluted earnings per common share |  |  |  |
(In millions, except per share data) |  |  |  | Three months ended March 31,
|  |  |  |  | 2021 |  | 2020
Numerator: |  |  |  |  |  |  |  |
Net income from continuing operations |  |  |  |  |  | $ | 2,406 |  |  | $ | 837 |
Less: Net loss attributable to noncontrolling interest |  |  |  |  |  | (6) |  |  | — |
Net income from continuing operations attributable to Allstate |  |  |  |  |  | 2,412 |  |  | 837 |
Less: Preferred stock dividends |  |  |  |  |  | 27 |  |  | 36 |
Net income from continuing operations applicable to common shareholders |  |  |  |  |  | 2,385 |  |  | 801 |
Loss from discontinued operations, net of tax |  |  |  |  |  | (3,793) |  |  | (288) |
Net (loss) income applicable to common shareholders |  |  |  |  |  | $ | (1,408) |  |  | $ | 513 |
Denominator: |  |  |  |  |  |  |  |
Weighted average common shares outstanding |  |  |  |  |  | 302.5 |  |  | 317.4 |
Effect of dilutive potential common shares: |  |  |  |  |  |  |  |
Stock options |  |  |  |  |  | 2.5 |  |  | 3.3 |
Restricted stock units (non-participating) and performance stock awards |  |  |  |  |  | 1.4 |  |  | 1.7 |
Weighted average common and dilutive potential common shares outstanding |  |  |  |  |  | 306.4 |  |  | 322.4 |
Earnings per common share applicable to common shareholders |  |  |  |  |  |  |  |
Basic |  |  |  |  |  |  |  |
Continuing operations |  |  |  |  |  | $ | 7.88 |  |  | $ | 2.52 |
Discontinued operations |  |  |  |  |  | (12.53) |  |  | (0.90) |
Total |  |  |  |  |  | $ | (4.65) |  |  | $ | 1.62 |
Diluted |  |  |  |  |  |  |  |
Continuing operations |  |  |  |  |  | $ | 7.78 |  |  | $ | 2.48 |
Discontinued operations |  |  |  |  |  | (12.38) |  |  | (0.89) |
Total |  |  |  |  |  | $ | (4.60) |  |  | $ | 1.59 |
Anti-dilutive options excluded from diluted earnings per common share |  |  |  |  |  | 2.2 |  |  | 0.8 |

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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