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Earnings per Common Share (Tables)
3 Months Ended
Mar. 31, 2024
Earnings Per Share [Abstract]  
Schedule of 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,
20242023
Numerator:
 
 
Net income (loss)$1,198 $(321)
Less: Net loss attributable to noncontrolling interest(20)(1)
Net income (loss) attributable to Allstate1,218 (320)
Less: Preferred stock dividends
29 26 
Net income (loss) applicable to common shareholders$1,189 $(346)
Denominator:
 
 
Weighted average common shares outstanding
263.5 263.5 
Effect of dilutive potential common shares (1):
  
Stock options
2.5 — 
Restricted stock units (non-participating) and performance stock awards
0.5 — 
Weighted average common and dilutive potential common shares outstanding
266.5 263.5 
Earnings per common share - Basic$4.51 $(1.31)
Earnings per common share - Diluted (1)
$4.46 $(1.31)
Anti-dilutive options excluded from diluted earnings per common share
0.7 1.1 
Weighted average dilutive potential common shares excluded due to net loss applicable to common shareholders (1)
— 2.6 
(1)As a result of the net loss reported for the three month period ended March 31, 2023, weighted average shares for basic earnings per share is also used for calculating diluted earnings per share because all dilutive potential common shares are anti-dilutive and are therefore excluded from the calculation.