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Pension and Other Postretirement Benefits (Details 3) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Retiree Medical |  |  |  |
Assumptions used in determining the benefit obligations and expense: |  |  |  |
Defined benefit plan, pre-65 health care cost trend rate assumed for next fiscal year |  | 8.40% | 8.00% |
Defined benefit plan, pre-65 ultimate health care cost trend rate for 2026 |  | 4.50% | 4.50% |
Defined benefit plan, post-65 health care cost trend rate assumed for next fiscal year |  | 9.80% | 8.40% |
Defined benefit plan, post-65 ultimate health care cost trend rate for 2026 |  | 4.50% | 4.50% |
United States | Pension Plans |  |  |  |
Current target asset allocation |  |  |  |
Defined Benefit Plan Target Allocation Percentage of Assets Non Equity Securities |  | 80.00% |  |
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage |  | 20.00% |  |
North America |  |  |  |
Assumptions used in determining the benefit obligations and expense: |  |  |  |
Weighted-average cash balance interest crediting rate—obligation |  | 4.40% | 3.90% | 3.90%
Weighted-average cash balance interest crediting rate—expense |  | 3.90% | 3.90% | 3.00%
Cash balance interest crediting rate for the plan |  | 3.00% |  |
North America | Pension Plans |  |  |  |
Expected future pension and retiree medical benefit payments: |  |  |  |
2025 |  | $ 14 |  |
2026 |  | 15 |  |
2027 |  | 16 |  |
2028 |  | 16 |  |
2029 |  | 17 |  |
2030-2034 |  | $ 92 |  |
Assumptions used in determining the benefit obligations and expense: |  |  |  |
Weighted average discount rate - obligation (as a percent) |  | 5.20% | 4.80% | 5.10%
Weighted average discount rate - expense (as a percent) |  | 4.80% | 5.10% | 3.60%
Weighted average rate of increase in future compensation (as a percent) |  | 3.30% | 3.30% | 3.80%
Weighted average expected long-term rate of return on assets-expense (as a percent) |  | 5.00% | 4.80% | 3.90%
North America | Pension Plans | Forecast |  |  |  |
Assumptions used in determining the benefit obligations and expense: |  |  |  |
Weighted average expected long-term rate of return on assets-expense (as a percent) | 5.10% |  |  |
North America | Retiree Medical |  |  |  |
Expected future pension and retiree medical benefit payments: |  |  |  |
2025 |  | $ 2 |  |
2026 |  | 2 |  |
2027 |  | 2 |  |
2028 |  | 2 |  |
2029 |  | 2 |  |
2030-2034 |  | $ 7 |  |
Assumptions used in determining the benefit obligations and expense: |  |  |  |
Weighted average discount rate - obligation (as a percent) |  | 5.40% | 4.80% | 5.00%
Weighted average discount rate - expense (as a percent) |  | 4.80% | 5.00% | 2.70%
Canada | Pension Plans | Terra Canadian Plan |  |  |  |
Current target asset allocation |  |  |  |
Defined Benefit Plan Target Allocation Percentage of Assets Non Equity Securities |  | 100.00% |  |
United Kingdom | Forecast |  |  |  |
Assumptions used in determining the benefit obligations and expense: |  |  |  |
Weighted average expected long-term rate of return on assets-expense (as a percent) | 6.10% |  |  |
United Kingdom | United Kingdom Terra |  |  |  |
Current target asset allocation |  |  |  |
Defined Benefit Plan, Target Plan Asset Allocations, Growth Portfolio |  | 25.00% | 46.00% |
Defined Benefit Plan, Target Plan Asset Allocations, Matching Portfolio |  | 75.00% | 54.00% |
United Kingdom | United Kingdom Kemira |  |  |  |
Current target asset allocation |  |  |  |
Defined Benefit Plan, Target Plan Asset Allocations, Growth Portfolio |  | 30.00% | 57.00% |
Defined Benefit Plan, Target Plan Asset Allocations, Matching Portfolio |  | 70.00% | 43.00% |
United Kingdom | Pension Plans |  |  |  |
Expected future pension and retiree medical benefit payments: |  |  |  |
2025 |  | $ 25 |  |
2026 |  | 25 |  |
2027 |  | 26 |  |
2028 |  | 27 |  |
2029 |  | 27 |  |
2030-2034 |  | $ 148 |  |
Assumptions used in determining the benefit obligations and expense: |  |  |  |
Weighted average discount rate - obligation (as a percent) |  | 5.50% | 4.60% | 4.80%
Weighted average discount rate - expense (as a percent) |  | 4.60% | 4.80% | 2.00%
Weighted average expected long-term rate of return on assets-expense (as a percent) |  | 6.50% | 6.10% | 3.40%
Weighted-average retail price index—obligation (as a percent) |  | 3.10% | 3.00% | 3.20%
Weighted-average retail price index—expense (as a percent) |  | 3.00% | 3.20% | 3.30%

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- Definition Represents the target allocation percentage of investments in non-equity securities to total plan assets presented on a weighted-average basis as of the measurement date of the latest statement of financial position. Non-equity securities consist of debt, money market instruments and actively managed portfolios. + References No definition available. + Details
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