Other Financial Information - Schedule of Other (Income) Expenses, Net (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Other Income and Expenses [Abstract]
Equity loss	$ 70	$ 89	$ 94
Foreign currency losses (gains), net	8	(39)	(16)
Net gain from asset sales	(164)	(32)	(34)
Net loss on mark-to-market derivative contracts	9	26	13
Other, net	(12)	(2)	1
Other (income) expenses, net	$ (89)	$ 42	$ 58