Consolidating Guarantor Financial Information (Narrative) (Details)	9 Months Ended
Sep. 30, 2019
Consolidating Guarantor Financial Information (Narrative) [Abstract]
Equity Method Investments Ownership Percentage of Subsidiary	100.00%

Consolidating Guarantor Financial Information (Narrative) [Abstract]

No definition available.

Name:	ce_ConsolidatingGuarantorFinancialInformationNarrativeAbstract
Namespace Prefix:	ce_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration