Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Tax loss carryforwards and credits	$ 1,415	$ 1,550
Capitalized research and development expenditures	655	622
Accrued expenses deductible as paid	501	583
Postretirement benefits and pensions	288	388
Investment and receivables related to Venezuelan deconsolidation	157	0
Alternative minimum tax credit carryforwards	78	85
Rationalizations and other provisions	22	49
Vacation and sick pay	37	36
Other	121	100
Total gross deferred tax assets	3,274	3,413
Valuation allowance	(621)	(632)
Total deferred tax assets	2,653	2,781
Property basis differences	(459)	(448)
Tax on undistributed earnings of subsidiaries	(144)	(170)
Total net deferred tax assets	$ 2,050	$ 2,163