Earnings per Common Share (Tables)

12 Months Ended

Dec. 31, 2025

Earnings Per Share [Abstract]

Schedule of Computation of Basic and Diluted Earnings Per Common Share

Computation of basic and diluted earnings per common share
	For the years ended December 31,
(In millions, except per share data)	2025		2024		2023
Numerator:
Net income (loss)	$	10,266	$	4,599	$	(213)
Less: Net loss attributable to noncontrolling interest	(16)		(68)		(25)
Net income (loss) attributable to Allstate	10,282		4,667		(188)
Less: Preferred stock dividends	117		117		128
Net income (loss) applicable to common shareholders	$	10,165	$	4,550	$	(316)
Denominator:
Weighted average common shares outstanding	263.6		264.3		262.5
Effect of dilutive potential common shares (1):
Stock options	2.4		2.6		—
Restricted stock units (non-participating) and performance stock awards	1.1		0.9		—
Weighted average common and dilutive potential common shares outstanding	267.1		267.8		262.5
Net income (loss) applicable to common shareholders per common share - Basic	$	38.56	$	17.22	$	(1.20)
Net income (loss) applicable to common shareholders per common share - Diluted (1)	$	38.06	$	16.99	$	(1.20)
Anti-dilutive options excluded from diluted earnings per common share	0.4		0.5		3.0
Weighted average dilutive potential common shares excluded due to net loss applicable to common shareholders (1)	—		—		2.2

(1)As a result of the net loss reported for the year ended December 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.