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Statutory Financial Information and Dividend Limitations - Schedule of Statutory Net Income (Loss) and Capital and Surplus of Allstate’s Domestic Insurance Subsidiaries (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Amount per statutory accounting practices |  |  |
Net income (loss) | $ 8,792 | $ 4,219 | $ (426)
Capital and surplus | 22,946 | 18,635 |
Employer voluntary benefits | 98 |  |
Property and casualty insurance |  |  |
Amount per statutory accounting practices |  |  |
Net income (loss) | 8,690 | 4,158 | (487)
Capital and surplus | 22,845 | 18,243 |
Accident and health insurance |  |  |
Amount per statutory accounting practices |  |  |
Net income (loss) | 102 | 61 | $ 61
Capital and surplus | $ 101 | $ 392 |

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