Income Taxes - Components of Net Deferred Tax Assets (Liabilities) (Detail) - USD ($) $ in Millions	Sep. 30, 2016	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Postretirement benefits	$ 260	$ 266
Intangible assets	(3,171)	(1,418)
Investments in non-US subsidiaries	(149)	(152)
Fixed assets, net	(150)	(176)
Inventories	262	159
Other, net	717	454
Net deferred tax assets (liabilities)	$ (2,231)	$ (867)