Goodwill and Intangible Assets, net (Schedule of Goodwill) (Details) $ in Millions	6 Months Ended
	Jun. 30, 2019 USD ($)
Goodwill [Line Items]
As of December 31, 2018	$ 1,057
Acquisitions	29
Exchange rate changes	(3)
As of March 31, 2019	1,083	[1]
Goodwill, Impaired, Accumulated Impairment Loss	0
Engineered Materials [Member]
Goodwill [Line Items]
As of December 31, 2018	707
Acquisitions	29	[2]
Exchange rate changes	(2)
As of March 31, 2019	734	[1]
Acetate Tow [Member]
Goodwill [Line Items]
As of December 31, 2018	148
Acquisitions	0
Exchange rate changes	0
As of March 31, 2019	148	[1]
Acetyl Chain [Member]
Goodwill [Line Items]
As of December 31, 2018	202
Acquisitions	0
Exchange rate changes	(1)
As of March 31, 2019	$ 201	[1]

[1] There were $0 million of accumulated impairment losses as of June 30, 2019.

[2] Represents goodwill related to the acquisition of Next Polymers Ltd.