Acquisitions, Dispositions, Ventures and Plant Closures (Ventures Narrative) (Details) (Acetyl Intermediates [Member], Mitsui & Co. Ltd. [Member])	3 Months Ended
Jun. 30, 2013 T
Acetyl Intermediates [Member] \| Mitsui & Co. Ltd. [Member]
Acquisitions, Dispositions, Ventures and Plant Closures [Line Items]
Expected Production Capacity Per Year	1,300,000.0

Expected production capacity per year, upon completion of Methanol facility.

No definition available.

Name:	ce_ExpectedProductionCapacityPerYear
Namespace Prefix:	ce_
Data Type:	num:massItemType
Balance Type:	na
Period Type:	duration