Income Taxes - Deferred Tax Assets (Liabilities) (Details) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Deferred tax liabilities:
Plant and equipment	$ (117)	$ (190)
Intangible assets	(181)	(221)
Other	(9)	(9)
Total deferred tax liabilities	(307)	(420)
Deferred tax assets:
Inventory	22	48
Postretirement benefits other than pensions	0	3
Reserves and accruals	199	160
Net operating losses and tax credits	149	259
Pensions	28	38
Other	26	27
Total deferred tax assets	424	535
Valuation allowance	(93)	(79)	$ (59)	$ (84)
Net deferred tax assets	$ 24	$ 36