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Fair Value of Assets and Liabilities - Schedule of Valuation Changes Included in Net Income and OCI for Level 3 Assets and Liabilities Held (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Gains (losses) included in net income for Level 3 assets and liabilities: |  |  |
Total recurring Level 3 assets | $ 35 | $ 22 | $ 37
Total recurring Level 3 liabilities | $ (1) | $ 0 | $ 0
Fair Value Recurring Basis Unobservable Input Reconciliation Liability Gain Loss Statement Of Income Extensible List Not Disclosed Flag | Total included in net income | Total included in net income | Total included in net income
Total included in net income | $ 34 | $ 22 | $ 37
Total included in net income | 34 | 22 | 37
Changes in unrealized net capital gains and losses reported in OCI | 5 | (1) | 3
Other liabilities |  |  |
Gains (losses) included in net income for Level 3 assets and liabilities: |  |  |
Total recurring Level 3 liabilities | $ (1) | $ 0 | $ 0
Net investment income |  |  |
Gains (losses) included in net income for Level 3 assets and liabilities: |  |  |
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | Allstate Protection and Run-off Property-Liability net investment income | Allstate Protection and Run-off Property-Liability net investment income | Allstate Protection and Run-off Property-Liability net investment income
Total included in net income | $ 1 | $ (8) | $ (1)
Net gains (losses) on investments and derivatives |  |  |
Gains (losses) included in net income for Level 3 assets and liabilities: |  |  |
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | Net gains (losses) on investments and derivatives | Net gains (losses) on investments and derivatives | Net gains (losses) on investments and derivatives
Total included in net income | $ 20 | $ 14 | $ 23
Operating costs and expenses |  |  |
Gains (losses) included in net income for Level 3 assets and liabilities: |  |  |
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | Operating costs and expenses | Operating costs and expenses | Operating costs and expenses
Total included in net income | $ 13 | $ 16 | $ 15
Municipal |  |  |
Gains (losses) included in net income for Level 3 assets and liabilities: |  |  |
Total recurring Level 3 assets | 0 | (2) | 0
Corporate - public |  |  |
Gains (losses) included in net income for Level 3 assets and liabilities: |  |  |
Total recurring Level 3 assets | (1) | 1 | 0
Changes in unrealized net capital gains and losses reported in OCI | 1 | 0 | 1
Corporate - privately placed |  |  |
Gains (losses) included in net income for Level 3 assets and liabilities: |  |  |
Total recurring Level 3 assets | (3) | (6) | (12)
Changes in unrealized net capital gains and losses reported in OCI | 4 | (1) | 2
Fixed income securities |  |  |
Gains (losses) included in net income for Level 3 assets and liabilities: |  |  |
Total recurring Level 3 assets | (4) | (7) | (12)
Equity securities |  |  |
Gains (losses) included in net income for Level 3 assets and liabilities: |  |  |
Total recurring Level 3 assets | 26 | 13 | 35
Other investments |  |  |
Gains (losses) included in net income for Level 3 assets and liabilities: |  |  |
Total recurring Level 3 assets | 0 | 0 | (1)
Other assets |  |  |
Gains (losses) included in net income for Level 3 assets and liabilities: |  |  |
Total recurring Level 3 assets | $ 13 | $ 16 | $ 15

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