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v3.25.4

Benefit Plans - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2025 | Dec. 31, 2024
Components of net periodic cost |  |
Percentage related to domestic plan | 89.00% |
Percentage related to domestic plan and former final average pay formula | 73.00% |
Maximum annual medical cost inflation after retirement for Company's share of retiree medical benefits cost for non Medicare-eligible retirees (as a percent) | 5.00% |
Components of net periodic cost |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Amortization of Prior Service Cost (Credit), Statement of Income or Comprehensive Income [Extensible Enumeration] | Allstate Protection and Run-off Property-Liability net investment income, Operating costs and expenses, Claims and claims expense, Restructuring and related charges |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Interest Cost, Statement of Income or Comprehensive Income [Extensible Enumeration] | Allstate Protection and Run-off Property-Liability net investment income, Operating costs and expenses, Claims and claims expense, Restructuring and related charges |
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Expected Return (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | Allstate Protection and Run-off Property-Liability net investment income, Operating costs and expenses, Claims and claims expense, Restructuring and related charges |
Pension benefits |  |
Components of net periodic cost |  |
Accumulated benefit obligation | $ 4,360 | $ 4,360
Defined benefit plans' accrued benefit costs related to certain unfunded and non-qualified plans | $ 72 | $ 74
Postretirement benefits |  |
Defined benefit plan, assumed health care cost trend rates |  |
Weighted average health care cost trend rate (as a percent) | 8.00% |
Ultimate health care cost trend rate in 2035 and thereafter (as a percent) | 4.50% |

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