Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Tax loss carryforwards and credits	$ 1,473	$ 1,515
Capitalized research and development expenditures	404	402
Accrued expenses deductible as paid	261	297
Postretirement benefits and pensions	207	223
Rationalizations and other provisions	26	36
Deferred interest deductions	40	0
Vacation and sick pay	23	24
Investment and receivables related to Venezuelan deconsolidation	0	80
Other	111	85
Total gross deferred tax assets	2,545	2,662
Valuation allowance	(317)	(318)
Total deferred tax assets	2,228	2,344
Property basis differences	(475)	(414)
Tax on undistributed earnings of subsidiaries	(1)	(22)
Total net deferred tax assets	$ 1,752	$ 1,908