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Pension and Other Postretirement Benefits (Details 3) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2026 | Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Current target asset allocation |  |  |  |
Defined Benefit Plan Target Allocation Percentage of Assets Non Equity Securities |  |  | 100.00% |
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 |  | 8.00% | 8.40% |
Defined benefit plan, pre-65 ultimate health care cost trend rate for 2035 and thereafter |  | 4.50% | 4.50% |
Defined benefit plan, post-65 health care cost trend rate assumed for next fiscal year |  | 9.30% | 9.80% |
Defined benefit plan, post-65 ultimate health care cost trend rate for 2035, 2034 and thereafter |  | 4.50% | 4.50% |
United States | Pension Plans |  |  |  |
Current target asset allocation |  |  |  |
Defined Benefit Plan Target Allocation Percentage of Assets Non Equity Securities |  | 100.00% |  |
North America |  |  |  |
Assumptions used in determining the benefit obligations and expense: |  |  |  |
Weighted-average cash balance interest crediting rate—obligation |  | 3.80% | 4.40% | 3.90%
Weighted-average cash balance interest crediting rate—expense |  | 4.40% | 3.90% | 3.90%
Cash balance interest crediting rate for the plan |  | 3.00% |  |
North America | Pension Plans |  |  |  |
Expected future pension and retiree medical benefit payments: |  |  |  |
2026 |  | $ 263 |  |
2027 |  | 0 |  |
2028 |  | 0 |  |
2029 |  | 0 |  |
2030 |  | 0 |  |
2031-2035 |  | $ 10 |  |
Assumptions used in determining the benefit obligations and expense: |  |  |  |
Weighted average discount rate - obligation (as a percent) |  | 4.20% | 5.20% | 4.80%
Weighted average discount rate - expense (as a percent) |  | 5.20% | 4.80% | 5.10%
Weighted average rate of increase in future compensation (as a percent) |  |  | 3.30% | 3.30%
Weighted average expected long-term rate of return on assets-expense (as a percent) |  | 5.10% | 5.00% | 4.80%
Current target asset allocation |  |  |  |
Defined Benefit Plan, Pension Plan with Projected Benefit Obligation in Excess of Plan Assets, Projected Benefit Obligation |  | $ 194 | $ 0 |
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) | 4.50% |  |  |
North America | Retiree Medical |  |  |  |
Expected future pension and retiree medical benefit payments: |  |  |  |
2026 |  | 2 |  |
2027 |  | 2 |  |
2028 |  | 2 |  |
2029 |  | 2 |  |
2030 |  | 2 |  |
2031-2035 |  | $ 6 |  |
Assumptions used in determining the benefit obligations and expense: |  |  |  |
Weighted average discount rate - obligation (as a percent) |  | 5.10% | 5.40% | 4.80%
Weighted average discount rate - expense (as a percent) |  | 5.40% | 4.80% | 5.00%
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) | 4.80% |  |  |
United Kingdom | United Kingdom Kemira |  |  |  |
Current target asset allocation |  |  |  |
Defined Benefit Plan, Target Plan Asset Allocations, Growth Portfolio |  | 30.00% |  |
Defined Benefit Plan, Target Plan Asset Allocations, Matching Portfolio |  | 70.00% |  |
United Kingdom | Pension Plans |  |  |  |
Expected future pension and retiree medical benefit payments: |  |  |  |
2026 |  | $ 26 |  |
2027 |  | 27 |  |
2028 |  | 27 |  |
2029 |  | 28 |  |
2030 |  | 28 |  |
2031-2035 |  | $ 153 |  |
Assumptions used in determining the benefit obligations and expense: |  |  |  |
Weighted average discount rate - obligation (as a percent) |  | 5.50% | 5.50% | 4.60%
Weighted average discount rate - expense (as a percent) |  | 5.50% | 4.60% | 4.80%
Weighted average expected long-term rate of return on assets-expense (as a percent) |  | 6.10% | 6.50% | 6.10%
Weighted-average retail price index—obligation (as a percent) |  | 2.80% | 3.10% | 3.00%
Weighted-average retail price index—expense (as a percent) |  | 3.10% | 3.00% | 3.20%
Current target asset allocation |  |  |  |
Defined Benefit Plan, Pension Plan with Projected Benefit Obligation in Excess of Plan Assets, Projected Benefit Obligation |  | $ 0 | $ 0 |
United Kingdom | United Kingdom Terra |  |  |  |
Current target asset allocation |  |  |  |
Defined Benefit Plan, Target Plan Asset Allocations, Growth Portfolio |  |  | 25.00% |
Defined Benefit Plan, Target Plan Asset Allocations, Matching Portfolio |  | 75.00% |  |

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