Goodwill and Intangible Assets, net (Schedule of Goodwill) (Details) $ in Millions	9 Months Ended
	Sep. 30, 2020 USD ($)
Goodwill [Line Items]
As of December 31, 2019	$ 1,074
Acquisitions	26
Exchange rate changes	28
As of March 31, 2019	1,128
Engineered Materials
Goodwill [Line Items]
As of December 31, 2019	727
Acquisitions	0
Exchange rate changes	18
As of March 31, 2019	745
Acetate Tow
Goodwill [Line Items]
As of December 31, 2019	148
Acquisitions	0
Exchange rate changes	0
As of March 31, 2019	148
Acetyl Chain
Goodwill [Line Items]
As of December 31, 2019	199
Acquisitions	26	[1]
Exchange rate changes	10
As of March 31, 2019	$ 235

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