Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Net operating loss carryforwards	$ 255	$ 319
Postretirement benefits, including pensions	98	119
Research and development costs	94	85
Expense accruals	75	78
Other tax credits recoverable	232	122
Capital loss carryforwards	40	43
Inventory reserves	13	16
Postemployment and other benefits	6	5
Total	813	787
Valuation allowances	(281)	(301)
Deferred tax assets	532	486
Unremitted earnings	(1)	(30)
Intangibles	(11)	(22)
Depreciation	(44)	(60)
Other	(59)	(13)
Deferred tax liabilities	(115)	(125)
Net deferred tax assets	$ 417	$ 361