v3.26.1
Earnings per Common Share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Numerator:        
Net income $ 3,271 $ 2,099 $ 5,729 $ 2,695
Less: Net income (loss) attributable to noncontrolling interest 0 (10) 1 (9)
Net income attributable to Allstate 3,271 2,109 5,728 2,704
Less: Preferred stock dividends 30 30 59 59
Net income applicable to common shareholders, basic 3,241 2,079 5,669 2,645
Net income applicable to common shareholders, diluted $ 3,241 $ 2,079 $ 5,669 $ 2,645
Denominator:        
Weighted average common shares outstanding (in shares) 256.0 264.6 257.7 264.9
Effect of dilutive potential common shares        
Stock options (in shares) 2.3 2.5 2.3 2.6
Restricted stock units (non-participating) and performance stock awards (in shares) 0.8 0.8 0.9 0.9
Weighted average common and dilutive potential common shares outstanding (in shares) 259.1 267.9 260.9 268.4
Earnings per common share:        
Earnings per common share - Basic (in dollars per share) $ 12.66 $ 7.86 $ 22.00 $ 9.98
Earnings per common share - Diluted (in dollars per share) $ 12.51 $ 7.76 $ 21.73 $ 9.85
Anti-dilutive share-based awards excluded from diluted earnings per common share (in shares) 0.7 0.5 0.6 0.4