Other Income, Net - Schedule of Other Expenses (Income), Net (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Other Income and Expenses [Abstract]
Equity income	$ 0	$ (7)	$ 0
Interest income	(19)	(16)	(16)
Foreign currency (gains) losses, net	(5)	(4)	51
Net (gain) loss from asset sales	(513)	11	(42)
Net loss (gain) on mark-to-market derivative contracts	0	1	(3)
Other, net	(103)	(79)	(18)
Other income, net	$ (640)	$ (94)	$ (28)