Schedule of Derivative Instruments not Designated as Hedges Losses (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Not Designated as Hedging Instrument
Derivative Instruments, Gain (Loss) [Line Items]
Amount of loss recognized in Nonoperating income (expense): Miscellaneous, net	$ (67)	$ (102)	$ (69)	$ (103)