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Earnings per Common Share - Computation earnings per common share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Numerator: |  |  |  |
Net income from continuing operations | $ 1,435 | $ 1,106 | $ 3,841 | $ 1,943
Less: Net income attributable to noncontrolling interest | 6 | 0 | 0 | 0
Net income from continuing operations attributable to Allstate | 1,429 | 1,106 | 3,841 | 1,943
Less: Preferred stock dividends | 30 | 26 | 57 | 62
Net income from continuing operations applicable to common shareholders | 1,399 | 1,080 | 3,784 | 1,881
Income (loss) from discontinued operations, net of tax | 196 | 144 | (3,597) | (144)
Net income applicable to common shareholders | $ 1,595 | $ 1,224 | $ 187 | $ 1,737
Denominator: |  |  |  |
Weighted average common shares - Basic (in shares) | 298.8 | 313.7 | 300.6 | 315.6
Effect of dilutive potential common shares: |  |  |  |
Stock options (in shares) | 3.2 | 2.1 | 2.8 | 2.7
Restricted stock units (non-participating) and performance stock awards (in shares) | 1.3 | 1.2 | 1.5 | 1.5
Weighted average common and dilutive potential common shares outstanding (in shares) | 303.3 | 317.0 | 304.9 | 319.8
Basic |  |  |  |
Earnings per common share - Continuing operations basic (in dollars per share) | $ 4.68 | $ 3.44 | $ 12.59 | $ 5.96
Earnings per common share - Discontinued operations basic (in dollars per share) | 0.66 | 0.46 | (11.97) | (0.46)
Earnings per common share - Basic (in dollars per share) | 5.34 | 3.90 | 0.62 | 5.50
Diluted |  |  |  |
Earnings per common share - Continuing operations diluted (in dollars per share) | 4.61 | 3.41 | 12.41 | 5.88
Earnings per common share - Discontinued operations diluted (in dollars per share) | 0.65 | 0.45 | (11.80) | (0.45)
Earnings per common share - Diluted (in dollars per share) | $ 5.26 | $ 3.86 | $ 0.61 | $ 5.43
Anti-dilutive options excluded from diluted earnings per common share (in shares) | 0.8 | 3.2 | 2.0 | 1.4

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