Income Taxes (Schedule of Consolidated Deferred Tax Assets and Liabilities) (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Defined Contribution Plan, Employer Discretionary Contribution Amount		$ 316
Deferred Tax Assets
Pension and postretirement obligations	[1]	143	$ 313
Accrued expenses		50	61
Inventory		10	11
Net operating loss		703	661
Tax credit carryforwards	[2]	478	136
Other		192	161
Subtotal		1,576	1,343
Valuation allowance	[3]	(618)	(386)
Total		958	957
Deferred Tax Liabilities
Depreciation and amortization		307	366
Investments in affiliates		427	475
Other		69	87
Total		803	928
Net deferred tax assets (liabilities)		$ 155	$ 29

[1] For the year ended December 31, 2017, the pension and postretirement obligations decreased primarily due to $316 million in employer contributions made to the US defined benefit plans (Note 15).

[2] For the year ended December 31, 2017, the tax credit carryforwards increased primarily due to internal reorganization transactions made in preparation for the proposed acetate tow joint venture with Blackstone discussed herein and Note 4.

[3] Includes deferred tax asset valuation allowances for the Company's deferred tax assets in the US, Luxembourg, Spain, China, Singapore, the United Kingdom, Canada and France. These valuation allowances relate primarily to net operating loss carryforward benefits and other net deferred tax assets, all of which may not be realizable. For the year ended December 31, 2017, the valuation allowance increased primarily due to the impact of the TCJA on excess foreign tax credits.