Income Tax - Components of Net Deferred Tax Assets (Detail) (USD $) In Millions, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Disclosure Income Tax Components Of Net Deferred Tax Assets Detail [Line Items]
Postretirement benefits	$ 240	$ 236
Intangible assets	(1,488)	(1,502)
Investments in non-US subsidiaries	(282)	(282)
Other, net	123	128
Net deferred tax assets	$ (1,407)	$ (1,420)