Goodwill and Intangible Assets, net (Schedule of Goodwill) (Details) $ in Millions	9 Months Ended
	Sep. 30, 2019 USD ($)
Goodwill [Line Items]
As of December 31, 2018	$ 1,057
Acquisitions	29
Exchange rate changes	(32)
As of March 31, 2019	1,054
Engineered Materials [Member]
Goodwill [Line Items]
As of December 31, 2018	707
Acquisitions	29	[1]
Exchange rate changes	(22)
As of March 31, 2019	714
Acetate Tow [Member]
Goodwill [Line Items]
As of December 31, 2018	148
Acquisitions	0
Exchange rate changes	(1)
As of March 31, 2019	147
Acetyl Chain [Member]
Goodwill [Line Items]
As of December 31, 2018	202
Acquisitions	0
Exchange rate changes	(9)
As of March 31, 2019	$ 193

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