Income Taxes - Components of Net Deferred Tax Assets (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Disclosure Income Tax Components Of Net Deferred Tax Assets Detail [Line Items]
Postretirement benefits	$ 236	$ 543
Intangible assets	(1,502)	(1,490)
Investments in non-US subsidiaries	(282)	(317)
Other, net	128	114
Net deferred tax assets	$ (1,420)	$ (1,150)