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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%