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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 | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Numerator: |  |  |  |
Net income from continuing operations | $ 206 | $ 1,216 | $ 4,047 | $ 3,159
Less: Net loss attributable to noncontrolling interest | (7) | 0 | (7) | 0
Net income from continuing operations attributable to Allstate | 213 | 1,216 | 4,054 | 3,159
Less: Preferred stock dividends | 30 | 27 | 87 | 89
Net income from continuing operations applicable to common shareholders | 183 | 1,189 | 3,967 | 3,070
Income (loss) from discontinued operations, net of tax | 325 | (63) | (3,272) | (207)
Net income applicable to common shareholders | $ 508 | $ 1,126 | $ 695 | $ 2,863
Denominator: |  |  |  |
Weighted average common shares - Basic (in shares) | 293.1 | 311.2 | 298.1 | 314.1
Effect of dilutive potential common shares: |  |  |  |
Stock options (in shares) | 3.1 | 1.6 | 2.9 | 2.3
Restricted stock units (non-participating) and performance stock awards (in shares) | 1.7 | 1.3 | 1.6 | 1.5
Weighted average common and dilutive potential common shares outstanding (in shares) | 297.9 | 314.1 | 302.6 | 317.9
Basic |  |  |  |
Earnings per common share - Continuing operations basic (in dollars per share) | $ 0.62 | $ 3.82 | $ 13.31 | $ 9.77
Earnings per common share - Discontinued operations basic (in dollars per share) | 1.11 | (0.20) | (10.98) | (0.66)
Earnings per common share - Basic (in dollars per share) | 1.73 | 3.62 | 2.33 | 9.11
Diluted |  |  |  |
Earnings per common share - Continuing operations diluted (in dollars per share) | 0.62 | 3.78 | 13.11 | 9.66
Earnings per common share - Discontinued operations diluted (in dollars per share) | 1.09 | (0.20) | (10.81) | (0.65)
Earnings per common share - Diluted (in dollars per share) | $ 1.71 | $ 3.58 | $ 2.30 | $ 9.01
Anti-dilutive options excluded from diluted earnings per common share (in shares) | 0.6 | 4.2 | 1.3 | 3.0

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