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Earnings per Common Share - Schedule of Computation of Basic and Diluted Earnings Per Common Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Numerator: |  |  |  |
Net loss | $ (4) | $ (674) | $ (1,700) | $ (1,046)
Less: Net income (loss) attributable to noncontrolling interest | 1 | (15) | (23) | (34)
Net loss attributable to Allstate | (5) | (659) | (1,677) | (1,012)
Less: Preferred stock dividends | 36 | 26 | 99 | 79
Net loss applicable to common shareholders, basic | (41) | (685) | (1,776) | (1,091)
Net loss applicable to common shareholders, diluted | $ (41) | $ (685) | $ (1,776) | $ (1,091)
Denominator: |  |  |  |
Weighted average common shares outstanding (in shares) | 261.8 | 268.7 | 262.6 | 273.5
Effect of dilutive potential common shares |  |  |  |
Stock options (in shares) | 0.0 | 0.0 | 0.0 | 0.0
Restricted stock units (non-participating) and performance stock awards (in shares) | 0.0 | 0.0 | 0.0 | 0.0
Weighted average common and dilutive potential common shares outstanding (in shares) | 261.8 | 268.7 | 262.6 | 273.5
Earnings per common share: |  |  |  |
Earnings per common share - Basic (in dollars per share) | $ (0.16) | $ (2.55) | $ (6.76) | $ (3.99)
Earnings per common share - Diluted (in dollars per share) | $ (0.16) | $ (2.55) | $ (6.76) | $ (3.99)
Anti-dilutive options excluded from diluted earnings per common share (in shares) | 3.1 | 2.4 | 3.0 | 1.6
Weighted average dilutive potential common shares excluded due to net loss applicable to common shareholders (in shares) | 1.5 | 2.9 | 1.9 | 3.3

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