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Economic Hedges (Detail) - Economic Hedging - Derivatives Not Designated as Hedging Instruments - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Derivative Instruments, Gain (Loss) [Line Items]        
Gain / (Loss) Recognized in Earnings $ (30) $ (14) $ (183) $ (73)
Commodity contracts | Cost of Sales        
Derivative Instruments, Gain (Loss) [Line Items]        
Gain / (Loss) Recognized in Earnings (17) (13) (176) (26)
Intercompany loans and forecasted interest payments | Currency exchange contracts | Interest and other expense, net        
Derivative Instruments, Gain (Loss) [Line Items]        
Gain / (Loss) Recognized in Earnings (13) 7 (8) 18
Forecasted transactions | Currency exchange contracts | Interest and other expense, net        
Derivative Instruments, Gain (Loss) [Line Items]        
Gain / (Loss) Recognized in Earnings 1 2 (1) 10
Forecasted transactions | Currency exchange contracts | Cost of Sales        
Derivative Instruments, Gain (Loss) [Line Items]        
Gain / (Loss) Recognized in Earnings $ (1) (14)   (91)
Forecasted transactions | Currency exchange contracts | Selling, general and administrative expenses        
Derivative Instruments, Gain (Loss) [Line Items]        
Gain / (Loss) Recognized in Earnings   $ 4 $ 2 $ 16