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Schedule of Derivative Instruments not Designated as Hedges Losses (Detail) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2015
Not Designated as Hedging Instrument    
Derivative Instruments, Gain (Loss) [Line Items]    
Amount of gain/(loss) recognized in Nonoperating income (expense): Miscellaneous, net $ 41 $ (2)