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Earnings per Common Share (Tables)
9 Months Ended
Sep. 30, 2023
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 September 30,Nine months ended September 30,
2023202220232022
Numerator:
 
 
 
 
Net loss$(4)$(674)$(1,700)$(1,046)
Less: Net income (loss) attributable to noncontrolling interest(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$(41)$(685)$(1,776)$(1,091)
Denominator:
 
 
 
 
Weighted average common shares outstanding
261.8 268.7 262.6 273.5 
Effect of dilutive potential common shares (1):
  
 
 
Stock options
— — — — 
Restricted stock units (non-participating) and performance stock awards
— — — — 
Weighted average common and dilutive potential common shares outstanding
261.8 268.7 262.6 273.5 
Earnings per common share - Basic$(0.16)$(2.55)$(6.76)$(3.99)
Earnings per common share - Diluted (1)
$(0.16)$(2.55)$(6.76)$(3.99)
Anti-dilutive options excluded from diluted earnings per common share
3.1 2.4 3.0 1.6 
Weighted average dilutive potential common shares excluded due to net loss applicable to common shareholders (1)
1.5 2.9 1.9 3.3 
(1)As a result of the net loss reported for the three and nine month periods ended September 30, 2023 and 2022, 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.