Income Taxes - Components of Net Deferred Tax Assets (Liabilities) (Detail) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Postretirement benefits	$ 266	$ 327
Intangible assets	(1,418)	(1,435)
Investments in non-US subsidiaries	(152)	(227)
Fixed assets, net	(176)	(331)
Inventories	159	112
Other, net	454	402
Net deferred tax assets (liabilities)	$ (867)	$ (1,152)