Income Taxes - Components of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Deferred tax assets:
Environmental and other reserves	$ 89	$ 150
Litigation reserves	14	149
Stock-based compensation and accrued employee benefits	26	35
Other assets and other accrued liabilities	8	27
Tax loss carryforwards	27	45
Foreign tax credit carryforwards	17	50
Total deferred tax assets	181	456
Less: Valuation allowance	(17)	(50)
Total deferred tax assets, net	164	406
Deferred tax liabilities:
Pension and other liabilities	(55)	(16)
Property, plant, and equipment	(274)	(441)
Inventories and other assets	(4)	(40)
Total deferred tax liabilities	(333)	(497)
Deferred tax liability, net	$ (169)	$ (91)