Subsequent Events	6 Months Ended
Jun. 30, 2026
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events On July 31, 2026, the Company entered into a receivables purchase and financing agreement (the "European Receivables Purchase and Financing Agreement") and established an accounts receivable purchasing and financing facility among certain of the Company's European subsidiaries, a wholly-owned, "bankruptcy remote" special purpose subsidiary (the "EU SPE") and certain global financial institutions. The European Receivables Purchase and Financing Agreement permits the EU SPE to either sell or borrow against certain receivables until July 31, 2028. Under the European Receivables Purchase and Financing Agreement, sales of accounts receivable from the EU SPE are treated as sales and are accounted for as a reduction in accounts receivable because the agreement transfers effective control over and risk related to such accounts receivable to the EU SPE. Borrowings against the receivables are not treated as sales and, as a result, are retained on the Company's unaudited consolidated balance sheets. The Company and related subsidiaries have no continuing involvement in the accounts receivable sold, other than collection and administrative responsibilities and such accounts receivable are no longer available to satisfy creditors of the Company or the related subsidiaries. The sales are transacted at 100% of the face value of the relevant accounts receivable, resulting in derecognition of such accounts receivables from the Company's unaudited consolidated balance sheets. On July 31, 2026, the Company sold $88 million of receivables under the European Receivables Purchase and Financing Agreement. On August 5, 2026, Celanese U.S. repaid in full all of its outstanding 1.400% unsecured senior notes due on August 5, 2026 ("1.400% Notes") for a total principal payment of $400 million plus accrued interest of $3 million. Cash on hand was used to fund the repayment.

Subsequent Events

6 Months Ended

Jun. 30, 2026

On July 31, 2026, the Company entered into a receivables purchase and financing agreement (the "European Receivables Purchase and Financing Agreement") and established an accounts receivable purchasing and financing facility among certain of the Company's European subsidiaries, a wholly-owned, "bankruptcy remote" special purpose subsidiary (the "EU SPE") and certain global financial institutions. The European Receivables Purchase and Financing Agreement permits the EU SPE to either sell or borrow against certain receivables until July 31, 2028. Under the European Receivables Purchase and Financing Agreement, sales of accounts receivable from the EU SPE are treated as sales and are accounted for as a reduction in accounts receivable because the agreement transfers effective control over and risk related to such accounts receivable to the EU SPE. Borrowings against the receivables are not treated as sales and, as a result, are retained on the Company's unaudited consolidated balance sheets. The Company and related subsidiaries have no continuing involvement in the accounts receivable sold, other than collection and administrative responsibilities and such accounts receivable are no longer available to satisfy creditors of the Company or the related subsidiaries. The sales are transacted at 100% of the face value of the relevant accounts receivable, resulting in derecognition of such accounts receivables from the Company's unaudited consolidated balance sheets. On July 31, 2026, the Company sold $88 million of receivables under the European Receivables Purchase and Financing Agreement.

On August 5, 2026, Celanese U.S. repaid in full all of its outstanding 1.400% unsecured senior notes due on August 5, 2026 ("1.400% Notes") for a total principal payment of $400 million plus accrued interest of $3 million. Cash on hand was used to fund the repayment.