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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%