Goodwill and Intangible Assets, Net (Schedule of Goodwill) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020		Dec. 31, 2019
Goodwill
Goodwill, beginning balance	$ 1,074		$ 1,057
Acquisitions	30		29
Exchange rate changes	62		(12)
Goodwill, ending balance	1,166	[1]	1,074
Accumulated impairment losses	0
Engineered Materials [Member]
Goodwill
Goodwill, beginning balance	727		707
Acquisitions	0		29	[2]
Exchange rate changes	41		(9)
Goodwill, ending balance	768	[1]	727
Acetate Tow [Member]
Goodwill
Goodwill, beginning balance	148		148
Acquisitions	0		0
Exchange rate changes	1		0
Goodwill, ending balance	149	[1]	148
Acetyl Chain [Member]
Goodwill
Goodwill, beginning balance	199		202
Acquisitions	30	[3]	0
Exchange rate changes	20		(3)
Goodwill, ending balance	$ 249	[1]	$ 199

[1] There were no accumulated impairment losses as of December 31, 2020.

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

[3] Represents goodwill related to the acquisition of Nouryon's redispersible polymer powders business offered under the Elotex® brand ("Elotex").