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Subsequent Events	12 Months Ended
Subsequent Events	Dec. 31, 2018
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events On January 7, 2019, Celanese, Celanese US and certain subsidiary borrowers entered into a new credit agreement with a group of lenders. The new agreement is substantially the same as the prior Credit Agreement, except that the facility was increased to $1.25 billion and the maturity date was extended to January 2024. On January 2, 2019, using cash on hand, the Company completed the acquisition of 100% of the ownership interests of Next Polymers Ltd., an India-based engineering thermoplastics ("ETP") compounder. The acquisition strengthens the Company's position in the Indian ETP market and further expands the Company's global manufacturing footprint. The acquisition will be accounted for as a business combination, and the acquired operations will be included in the Engineered Materials segment beginning in the first quarter of 2019. The Company has not presented a purchase price allocation related to the fair values of assets acquired and liabilities assumed because the initial accounting for the acquisition was incomplete as of the issuance date of the financial statements. The acquisition is not expected to be material to the Company's 2019 financial position or results of operations.