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Revenue Recognition - Disaggregation of net sales (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |
Net sales |  | $ 2,419 |  | $ 2,648 |  | $ 7,340 |  | $ 7,910 |
Engineered Materials |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |
Net sales |  | 1,384 |  | 1,481 |  | 4,113 |  | 4,326 |
Acetyl Chain |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |
Net sales | [1] | 1,035 |  | 1,167 |  | 3,227 |  | 3,584 |
Intersegment Eliminations |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |
Net sales |  | (26) | [2] | (23) | [2] | (65) | [3] | (69) | [3]
Intersegment Eliminations | Acetyl Chain |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |
Net sales |  | 26 |  | 23 |  | 65 |  | 69 |
North America | Engineered Materials |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |
Net sales |  | 378 |  | 419 |  | 1,131 |  | 1,211 |
North America | Acetyl Chain |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |
Net sales |  | 363 |  | 374 |  | 1,113 |  | 1,152 |
Europe and Africa | Engineered Materials |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |
Net sales |  | 404 |  | 414 |  | 1,210 |  | 1,313 |
Europe and Africa | Acetyl Chain |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |
Net sales |  | 373 |  | 406 |  | 1,162 |  | 1,250 |
Asia-Pacific | Engineered Materials |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |
Net sales |  | 568 |  | 610 |  | 1,670 |  | 1,693 |
Asia-Pacific | Acetyl Chain |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |
Net sales |  | 275 |  | 355 |  | 876 |  | 1,095 |
South America | Engineered Materials |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |
Net sales |  | 34 |  | 38 |  | 102 |  | 109 |
South America | Acetyl Chain |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |
Net sales |  | $ 24 |  | $ 32 |  | $ 76 |  | $ 87 |
[1] | Excludes intersegment sales of $26 million and $23 million for the three months ended September 30, 2025 and 2024, respectively. Excludes intersegment sales of $65 million and $69 million for the nine months ended September 30, 2025 and 2024, respectively.
[2] | Includes intersegment sales primarily related to the Acetyl Chain.
[3] | Includes intersegment sales primarily related to the Acetyl Chain.

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