Other Expenses (Income), Net - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2015	Dec. 31, 2014
Suriname Mining Interest [Member]
Component of Other Income, Nonoperating [Abstract]
Net gain from asset sales		$ 28
China Rolling Mill Equity Investment [Member]
Component of Other Income, Nonoperating [Abstract]
Net gain from asset sales	$ 19	$ 14
Lake Charles, LA Anode Facility and Sherwin, TX Refinery Site [Member]
Component of Other Income, Nonoperating [Abstract]
Net gain from asset sales	$ 49

The net realized gain (loss) on investments sold during the period, not including gains (losses) on securities separately or otherwise categorized as trading, available-for-sale, or held-to-maturity, which, for cash flow reporting, is a component of proceeds from investing activities.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585

Name:	us-gaap_GainLossOnSaleOfInvestments
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration