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Restructuring and Other Charges - Schedule of Restructuring and Related Costs (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Restructuring Cost and Reserve [Line Items]      
Total cash charges $ 123    
Total non-cash charges 109    
Total restructuring and other charges 232 $ 0 $ 0
Botlek closure      
Restructuring Cost and Reserve [Line Items]      
Total cash charges 102    
Total non-cash charges 71    
Total restructuring and other charges 173    
Fuzhou closure      
Restructuring Cost and Reserve [Line Items]      
Total cash charges 21    
Total non-cash charges 38    
Total restructuring and other charges 59    
Severance and employee benefits      
Restructuring Cost and Reserve [Line Items]      
Total cash charges 37    
Severance and employee benefits | Botlek closure      
Restructuring Cost and Reserve [Line Items]      
Total cash charges 27    
Severance and employee benefits | Fuzhou closure      
Restructuring Cost and Reserve [Line Items]      
Total cash charges 10    
Idling Activities      
Restructuring Cost and Reserve [Line Items]      
Total cash charges 54    
Idling Activities | Botlek closure      
Restructuring Cost and Reserve [Line Items]      
Total cash charges 54    
Idling Activities | Fuzhou closure      
Restructuring Cost and Reserve [Line Items]      
Total cash charges 0    
Asset retirement obligation adjustments      
Restructuring Cost and Reserve [Line Items]      
Total cash charges 12    
Asset retirement obligation adjustments | Botlek closure      
Restructuring Cost and Reserve [Line Items]      
Total cash charges 11    
Asset retirement obligation adjustments | Fuzhou closure      
Restructuring Cost and Reserve [Line Items]      
Total cash charges 1    
Environmental liability      
Restructuring Cost and Reserve [Line Items]      
Total cash charges 8    
Environmental liability | Botlek closure      
Restructuring Cost and Reserve [Line Items]      
Total cash charges 0    
Environmental liability | Fuzhou closure      
Restructuring Cost and Reserve [Line Items]      
Total cash charges 8    
Contract abandonment and other changes      
Restructuring Cost and Reserve [Line Items]      
Total cash charges 12    
Contract abandonment and other changes | Botlek closure      
Restructuring Cost and Reserve [Line Items]      
Total cash charges 10    
Contract abandonment and other changes | Fuzhou closure      
Restructuring Cost and Reserve [Line Items]      
Total cash charges 2    
Asset disposal      
Restructuring Cost and Reserve [Line Items]      
Total non-cash charges 107    
Asset disposal | Botlek closure      
Restructuring Cost and Reserve [Line Items]      
Total non-cash charges 70    
Asset disposal | Fuzhou closure      
Restructuring Cost and Reserve [Line Items]      
Total non-cash charges 37    
Other non-cash charges      
Restructuring Cost and Reserve [Line Items]      
Total non-cash charges 2    
Other non-cash charges | Botlek closure      
Restructuring Cost and Reserve [Line Items]      
Total non-cash charges 1    
Other non-cash charges | Fuzhou closure      
Restructuring Cost and Reserve [Line Items]      
Total non-cash charges $ 1