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Pension and Other Postretirement Benefits (Details 3) - USD ($) $ in Millions |  | 12 Months Ended
--- | --- | ---
Jan. 01, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
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 |  | 6.30% | 6.30% |
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 |  | 6.80% | 7.00% |
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% |  |
United Kingdom | Subsequent Event |  |  |  |
Assumptions used in determining the benefit obligations and expense: |  |  |  |
Weighted average expected long-term rate of return on assets-expense (as a percent) | 3.40% |  |  |
United Kingdom | United Kingdom Terra |  |  |  |
Current target asset allocation |  |  |  |
Defined Benefit Plan, Target Plan Asset Allocations, Growth Portfolio |  | 55.00% |  |
Defined Benefit Plan, Target Plan Asset Allocations, Matching Portfolio |  | 45.00% |  |
United Kingdom | United Kingdom Kemira |  |  |  |
Current target asset allocation |  |  |  |
Defined Benefit Plan, Target Plan Asset Allocations, Growth Portfolio |  | 60.00% |  |
Defined Benefit Plan, Target Plan Asset Allocations, Matching Portfolio |  | 40.00% |  |
United Kingdom | Pension Plans |  |  |  |
Expected future pension and retiree medical benefit payments: |  |  |  |
2022 |  | $ 28 |  |
2023 |  | 28 |  |
2024 |  | 29 |  |
2025 |  | 30 |  |
2026 |  | 31 |  |
2027-2031 |  | $ 167 |  |
Assumptions used in determining the benefit obligations and expense: |  |  |  |
Weighted average discount rate - obligation (as a percent) |  | 2.00% | 1.50% | 2.00%
Weighted average discount rate - expense (as a percent) |  | 1.50% | 2.00% | 2.90%
Weighted average expected long-term rate of return on assets-expense (as a percent) |  | 3.30% | 3.40% | 4.40%
Weighted-average retail price index—obligation (as a percent) |  | 3.30% | 3.00% | 3.00%
Weighted-average retail price index—expense (as a percent) |  | 3.00% | 3.00% | 3.30%
North America |  |  |  |
Assumptions used in determining the benefit obligations and expense: |  |  |  |
Weighted-average cash balance interest crediting rate—obligation |  | 3.00% | 3.00% | 3.00%
Weighted-average cash balance interest crediting rate—expense |  | 3.00% | 3.00% | 3.00%
Cash balance interest crediting rate for the plan |  | 3.00% |  |
North America | Pension Plans |  |  |  |
Expected future pension and retiree medical benefit payments: |  |  |  |
2022 |  | $ 47 |  |
2023 |  | 48 |  |
2024 |  | 49 |  |
2025 |  | 49 |  |
2026 |  | 50 |  |
2027-2031 |  | $ 253 |  |
Assumptions used in determining the benefit obligations and expense: |  |  |  |
Weighted average discount rate - obligation (as a percent) |  | 2.80% | 2.40% | 3.10%
Weighted average discount rate - expense (as a percent) |  | 2.40% | 3.10% | 4.10%
Weighted average rate of increase in future compensation (as a percent) |  | 4.20% | 4.20% | 4.20%
Weighted average expected long-term rate of return on assets-expense (as a percent) |  | 3.20% | 4.10% | 4.60%
North America | Pension Plans | Subsequent Event |  |  |  |
Assumptions used in determining the benefit obligations and expense: |  |  |  |
Weighted average expected long-term rate of return on assets-expense (as a percent) | 3.60% |  |  |
North America | Retiree Medical |  |  |  |
Expected future pension and retiree medical benefit payments: |  |  |  |
2022 |  | $ 3 |  |
2023 |  | 2 |  |
2024 |  | 2 |  |
2025 |  | 2 |  |
2026 |  | 2 |  |
2027-2031 |  | $ 9 |  |
Assumptions used in determining the benefit obligations and expense: |  |  |  |
Weighted average discount rate - obligation (as a percent) |  | 2.70% | 2.20% | 3.00%
Weighted average discount rate - expense (as a percent) |  | 2.20% | 3.00% | 4.10%
Canada | Pension Plans | CF Canadian Plan |  |  |  |
Current target asset allocation |  |  |  |
Defined Benefit Plan Target Allocation Percentage of Assets Non Equity Securities |  | 70.00% |  |
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage |  | 30.00% |  |
Canada | Pension Plans | Terra Canadian Plan |  |  |  |
Current target asset allocation |  |  |  |
Defined Benefit Plan Target Allocation Percentage of Assets Non Equity Securities |  | 100.00% |  |

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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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