Other (Charges) Gains, Net Other (Charges) Gains, Net (Narrative 2) (Details) $ in Millions	3 Months Ended
Jun. 30, 2015 USD ($)
Research and Development Expense [Member] \| Acetyl Intermediates [Member]
Schedule of Accelerated Depreciation [Line Items]
Accelerated Depreciation	$ 39

Amount of accelerated depreciation charged against earnings associated with the write-off of research and development related depreciable assets.

No definition available.

Name:	ce_AcceleratedDepreciation
Namespace Prefix:	ce_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration