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Earnings per Common Share (Tables) | 9 Months Ended
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Sep. 30, 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 |  |  |  |
(In millions, except per share data) |  | Three months ended September 30, |  | Nine months ended September 30,
| 2025 |  | 2024 |  | 2025 |  | 2024
Numerator: |  |  |  |  |  |  |  |
Net income |  | $ | 3,744 |  |  | $ | 1,164 |  |  | $ | 6,439 |  |  | $ | 2,709 |
Less: Net loss attributable to noncontrolling interest |  | (2) |  |  | (26) |  |  | (11) |  |  | (30) |
Net income attributable to Allstate |  | 3,746 |  |  | 1,190 |  |  | 6,450 |  |  | 2,739 |
Less: Preferred stock dividends |  | 29 |  |  | 29 |  |  | 88 |  |  | 88 |
Net income applicable to common shareholders |  | $ | 3,717 |  |  | $ | 1,161 |  |  | $ | 6,362 |  |  | $ | 2,651 |
Denominator: |  |  |  |  |  |  |  |
Weighted average common shares outstanding |  | 263.1 |  |  | 264.6 |  |  | 264.3 |  |  | 264.1 |
Effect of dilutive potential common shares: |  |  |  |  |  |  |  |
Stock options |  | 2.3 |  |  | 2.6 |  |  | 2.5 |  |  | 2.6 |
Restricted stock units (non-participating) and performance stock awards |  | 1.0 |  |  | 0.8 |  |  | 1.0 |  |  | 0.7 |
Weighted average common and dilutive potential common shares outstanding |  | 266.4 |  |  | 268.0 |  |  | 267.8 |  |  | 267.4 |
Earnings per common share - Basic |  | $ | 14.13 |  |  | $ | 4.39 |  |  | $ | 24.07 |  |  | $ | 10.04 |
Earnings per common share - Diluted |  | $ | 13.95 |  |  | $ | 4.33 |  |  | $ | 23.76 |  |  | $ | 9.91 |
Anti-dilutive share-based awards excluded from diluted earnings per common share |  | 0.5 |  |  | 0.6 |  |  | 0.4 |  |  | 0.5 |

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 260 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482662/260-10-50-1 + Details
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