Goodwill and Intangible Assets, net (Schedule of Goodwill) (Details) $ in Millions	6 Months Ended
	Jun. 30, 2018 USD ($)
Goodwill [Line Items]
As of December 31, 2017	$ 1,003
Acquisitions (Note 3)	84
Exchange rate changes	(18)
As of June 30, 2017	1,069	[1]
Goodwill, Impaired, Accumulated Impairment Loss	0
Engineered Materials [Member]
Goodwill [Line Items]
As of December 31, 2017	643
Acquisitions (Note 3)	84
Exchange rate changes	(13)
As of June 30, 2017	714	[1]
Consumer Specialties [Member]
Goodwill [Line Items]
As of December 31, 2017	149
Acquisitions (Note 3)	0
Exchange rate changes	0
As of June 30, 2017	149	[1]
Industrial Specialties [Member]
Goodwill [Line Items]
As of December 31, 2017	40
Acquisitions (Note 3)	0
Exchange rate changes	0
As of June 30, 2017	40	[1]
Acetyl Intermediates [Member]
Goodwill [Line Items]
As of December 31, 2017	171
Acquisitions (Note 3)	0
Exchange rate changes	(5)
As of June 30, 2017	$ 166	[1]

[1] There were $0 million of accumulated impairment losses as of June 30, 2018.