Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Tax loss carryforwards and credits	$ 1,515	$ 1,503
Capitalized research and development expenditures	402	666
Accrued expenses deductible as paid	297	456
Postretirement benefits and pensions	223	294
Rationalizations and other provisions	36	36
Vacation and sick pay	24	37
Investment and receivables related to Venezuelan deconsolidation	80	134
Alternative minimum tax credit carryforwards	0	43
Other	85	106
Total gross deferred tax assets	2,662	3,275
Valuation allowance	(318)	(326)
Total deferred tax assets	2,344	2,949
Property basis differences	(414)	(482)
Tax on undistributed earnings of subsidiaries	(22)	(138)
Total net deferred tax assets	$ 1,908	$ 2,329