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Other (Charges) Gains, Net (Narrative) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Other (Charges) Gains, Net [Line Items]      
Commercial disputes $ 6 $ (4) $ 0
Restructuring 20 23 4
Asset impairments 31 83 0
Plant Office Closures (7) 4 $ (13)
European Commission Competition Law Investigation [Member]      
Other (Charges) Gains, Net [Line Items]      
Loss Contingency, Estimate of Possible Loss   (89)  
Engineered Materials [Member]      
Other (Charges) Gains, Net [Line Items]      
Commercial disputes   15  
Other Activities [Member]      
Other (Charges) Gains, Net [Line Items]      
Commercial disputes   $ 19  
Acetyl Chain [Member]      
Other (Charges) Gains, Net [Line Items]      
Plant Office Closures (6)    
Europe [Member] | Engineered Materials [Member]      
Other (Charges) Gains, Net [Line Items]      
Restructuring [1] 6    
Asset impairments [1] 26    
Lebanon, Tennessee [Member] | Engineered Materials [Member]      
Other (Charges) Gains, Net [Line Items]      
Asset impairments $ 4    
[1] Included in Other (charges) gains, net in the consolidated statements of operations (Note 16).