Other (Charges) Gains, Net (Schedule of Restructuring Reserves) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Restructuring Reserve [Roll Forward]
Reserve as of the end of the period	$ 4
Total	4
Employee Termination Benefits [Member]
Restructuring Reserve [Roll Forward]
Reserve as of the beginning of the period	3	$ 16
Additions	4	4
Cash payments	(3)	(8)
Other changes	0	9
Exchange rate changes	0	0
Reserve as of the end of the period	4	3
Total	3	16
Plant/Office Closures [Member]
Restructuring Reserve [Roll Forward]
Reserve as of the beginning of the period	2	0
Additions	0	29
Cash payments	(2)	(24)
Other changes	0	(3)
Exchange rate changes	0	0
Reserve as of the end of the period	0	2
Total	2	0
Other [Member]
Restructuring Reserve [Roll Forward]
Reserve as of the end of the period	0
Total	0
Other [Member] | Employee Termination Benefits [Member]
Restructuring Reserve [Roll Forward]
Reserve as of the beginning of the period	1	3
Additions	0	1
Cash payments	(1)	(2)
Other changes	0	1
Exchange rate changes	0	0
Reserve as of the end of the period	0	1
Total	1	3
Other [Member] | Plant/Office Closures [Member]
Restructuring Reserve [Roll Forward]
Reserve as of the beginning of the period	0	0
Additions	0	0
Cash payments	0	0
Other changes	0	0
Exchange rate changes	0	0
Reserve as of the end of the period	0	0
Total	0	0
Engineered Materials [Member]
Restructuring Reserve [Roll Forward]
Reserve as of the end of the period	0
Total	0
Engineered Materials [Member] | Employee Termination Benefits [Member]
Restructuring Reserve [Roll Forward]
Reserve as of the beginning of the period	1	2
Additions	0	1
Cash payments	(1)	(2)
Other changes	0	0
Exchange rate changes	0	0
Reserve as of the end of the period	0	1
Total	1	2
Engineered Materials [Member] | Plant/Office Closures [Member]
Restructuring Reserve [Roll Forward]
Reserve as of the beginning of the period	0	0
Additions	0	0
Cash payments	0	0
Other changes	0	0
Exchange rate changes	0	0
Reserve as of the end of the period	0	0
Total	0	0
Acetate Tow [Member]
Restructuring Reserve [Roll Forward]
Reserve as of the end of the period	2
Total	2
Acetate Tow [Member] | Employee Termination Benefits [Member]
Restructuring Reserve [Roll Forward]
Reserve as of the beginning of the period	0	8
Additions	2	2
Cash payments	0	(2)
Other changes	0	8
Exchange rate changes	0	0
Reserve as of the end of the period	2	0
Total	0	8
Acetate Tow [Member] | Plant/Office Closures [Member]
Restructuring Reserve [Roll Forward]
Reserve as of the beginning of the period	0	0
Additions	0	0
Cash payments	0	0
Other changes	0	0
Exchange rate changes	0	0
Reserve as of the end of the period	0	0
Total	0	0
Acetyl Chain [Member]
Restructuring Reserve [Roll Forward]
Reserve as of the end of the period	2
Total	2
Acetyl Chain [Member] | Employee Termination Benefits [Member]
Restructuring Reserve [Roll Forward]
Reserve as of the beginning of the period	1	3
Additions	2	0
Cash payments	(1)	(2)
Other changes	0	0
Exchange rate changes	0	0
Reserve as of the end of the period	2	1
Total	1	3
Acetyl Chain [Member] | Plant/Office Closures [Member]
Restructuring Reserve [Roll Forward]
Reserve as of the beginning of the period	2	0
Additions	0	29
Cash payments	(2)	(24)
Other changes	0	(3)
Exchange rate changes	0	0
Reserve as of the end of the period	0	2
Total	$ 2	$ 0