v3.26.1
Revenue Recognition - Disaggregation of net sales (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Disaggregation of Revenue [Line Items]        
Net sales $ 2,752 $ 2,532 $ 5,089 $ 4,921
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-07-01        
Disaggregation of Revenue [Line Items]        
Revenue, remaining performance obligation, expected timing of satisfaction, period 6 months   6 months  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2027-01-01        
Disaggregation of Revenue [Line Items]        
Revenue, remaining performance obligation, expected timing of satisfaction, period 1 year   1 year  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2028-01-01        
Disaggregation of Revenue [Line Items]        
Revenue, remaining performance obligation, expected timing of satisfaction, period 1 year   1 year  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2029-01-01        
Disaggregation of Revenue [Line Items]        
Revenue, remaining performance obligation, expected timing of satisfaction, period 1 year   1 year  
Engineered Materials        
Disaggregation of Revenue [Line Items]        
Net sales $ 1,446 1,442 $ 2,771 2,729
Acetyl Chain        
Disaggregation of Revenue [Line Items]        
Net sales [1] 1,306 1,090 2,318 2,192
Intersegment Eliminations        
Disaggregation of Revenue [Line Items]        
Net sales (23) [2] (25) [2] (47) [3] (39) [3]
Intersegment Eliminations | Acetyl Chain        
Disaggregation of Revenue [Line Items]        
Net sales 23 25 47 39
North America | Engineered Materials        
Disaggregation of Revenue [Line Items]        
Net sales 377 404 734 753
North America | Acetyl Chain        
Disaggregation of Revenue [Line Items]        
Net sales 431 364 779 750
Europe and Africa | Engineered Materials        
Disaggregation of Revenue [Line Items]        
Net sales 470 418 903 806
Europe and Africa | Acetyl Chain        
Disaggregation of Revenue [Line Items]        
Net sales 483 404 849 789
Asia-Pacific | Engineered Materials        
Disaggregation of Revenue [Line Items]        
Net sales 566 586 1,070 1,102
Asia-Pacific | Acetyl Chain        
Disaggregation of Revenue [Line Items]        
Net sales 355 294 627 601
South America | Engineered Materials        
Disaggregation of Revenue [Line Items]        
Net sales 33 34 64 68
South America | Acetyl Chain        
Disaggregation of Revenue [Line Items]        
Net sales $ 37 $ 28 $ 63 $ 52
[1] Excludes intersegment sales of $23 million and $25 million for the three months ended June 30, 2026 and 2025, respectively. Excludes intersegment sales of $47 million and $39 million for the six months ended June 30, 2026 and 2025, respectively.
[2] Includes intersegment sales primarily related to the Acetyl Chain.
[3] Includes intersegment sales primarily related to the Acetyl Chain.