Goodwill and Intangible Assets, Net (Schedule of Goodwill) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018		Dec. 31, 2017
Goodwill
Goodwill, beginning balance	$ 1,003		$ 796
Acquisitions (Note 4)	84		128
Exchange rate changes	(30)		79
Goodwill, ending balance	1,057	[1]	1,003
Accumulated impairment losses	0
Engineered Materials [Member]
Goodwill
Goodwill, beginning balance	643		462
Acquisitions (Note 4)	84		128
Exchange rate changes	(20)		53
Goodwill, ending balance	707	[1]	643
Acetate Tow [Member]
Goodwill
Goodwill, beginning balance	149		148
Acquisitions (Note 4)	0		0
Exchange rate changes	(1)		1
Goodwill, ending balance	148	[1]	149
Acetyl Chain [Member]
Goodwill
Goodwill, beginning balance	211		186
Acquisitions (Note 4)	0		0
Exchange rate changes	(9)		25
Goodwill, ending balance	$ 202	[1]	$ 211

[1] There were $0 million of accumulated impairment losses as of December 31, 2018.