Acquisitions and Divestitures - 2015 Divestiture - Additional Information (Detail) $ in Millions	1 Months Ended	3 Months Ended	12 Months Ended
	Mar. 31, 2015 USD ($) Employees	Dec. 31, 2014 USD ($)	Dec. 31, 2015 USD ($)
Business Acquisition [Line Items]
Loss from divestitures before income tax		$ 332
Net loss, after tax and noncontrolling interest		$ 163
Stupino Titanium Company [Member]
Business Acquisition [Line Items]
Sale generated in last annual period prior to divestiture	$ 130
Number of employees | Employees	1,870
Russia [Member]
Business Acquisition [Line Items]
Net cash received			$ 30
Loss from divestitures before income tax			161
Net loss, after tax and noncontrolling interest			$ 151