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Summary of Significant Accounting Policies - Schedule of Unearned Premiums (Details) - USD ($) $ in Millions | Dec. 31, 2025 | Dec. 31, 2024
--- | --- | ---
Deferred Policy Acquisition and Sales Inducement Costs: |  |
Unearned premiums | $ 29,080 | $ 26,909
All other |  |
Deferred Policy Acquisition and Sales Inducement Costs: |  |
Unearned premiums | 11 | 14
Protection Services | Operating segments |  |
Deferred Policy Acquisition and Sales Inducement Costs: |  |
Unearned premiums | 5,605 | 5,385
Allstate Health and Benefits | Operating segments |  |
Deferred Policy Acquisition and Sales Inducement Costs: |  |
Unearned premiums | $ 0 | $ 2

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