Debt (Schedule of Net Deferred Financing Costs) (Details) - USD ($) $ in Millions	1 Months Ended	12 Months Ended
	Sep. 30, 2014	Dec. 31, 2015		Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Debt Instrument [Line Items]
Deferred Finance Costs, Net		$ 22	[1]	$ 27	[1]	$ 27		$ 30
Financing costs deferred		0		10	[2]	2	[3]
Accelerated amortization due to refinancing activity		0		(5)	[4]	0
Amortization		$ (5)		(5)		$ (5)
Senior Unsecured Notes Due 2018 [Member]
Debt Instrument [Line Items]
Interest Rate		6.625%
Accelerated amortization due to refinancing activity				(4)
Senior Unsecured Notes Due 2022 [Member]
Debt Instrument [Line Items]
Interest Rate		4.625%
Term C-3 Loan Facility [Member]
Debt Instrument [Line Items]
Financing costs deferred				4
Term C-2 Loan Facility [Member]
Debt Instrument [Line Items]
Credit facility, expiration date		Oct. 15, 2016
Accelerated amortization due to refinancing activity				(1)
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Credit facility, expiration date	Oct. 15, 2018
Repayments of Lines of Credit		$ 200
Senior Unsecured Notes Due 2019 [Member]
Debt Instrument [Line Items]
Interest Rate		3.25%
Financing costs deferred				6
Other Noncurrent Assets [Member] | Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Deferred Finance Costs, Net		$ 4		$ 5

[1] Includes $4 million and $5 million as of December 31, 2015 and 2014, respectively, related to the Company's revolving credit facility and accounts receivables securitization facility, which are included in Other noncurrent assets in the consolidated balance sheets.

[2] Includes $6 million related to the issuance of the 3.250% Notes and $4 million related to the September 2014 amendment to the Celanese US existing senior secured credit facilities.

[3] Relates to the September 2013 amendment to the Celanese US existing senior secured credit facilities to reduce the interest rates payable in connection with certain borrowings thereby creating the Term C-2 loan facility due 2016.

[4] Includes $4 million related to the 6.625% Notes redemption and $1 million related to the Term C-2 loan facility conversion.