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Economic Hedges (Detail) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Derivative Instruments, Gain (Loss) [Line Items]        
Gain / (Loss) Recognized in Earnings       $ 436
Derivatives Not Designated as Hedging Instruments | Economic Hedging        
Derivative Instruments, Gain (Loss) [Line Items]        
Gain / (Loss) Recognized in Earnings $ (14) $ (7) $ (73) 323
Derivatives Not Designated as Hedging Instruments | Economic Hedging | Commodity contracts | Cost of Sales        
Derivative Instruments, Gain (Loss) [Line Items]        
Gain / (Loss) Recognized in Earnings (13) (99) (26) (158)
Derivatives Not Designated as Hedging Instruments | Economic Hedging | 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 7 8 18 22
Derivatives Not Designated as Hedging Instruments | Economic Hedging | Forecasted transactions | Currency exchange contracts | Interest and other expense, net        
Derivative Instruments, Gain (Loss) [Line Items]        
Gain / (Loss) Recognized in Earnings 2 36 10 437
Derivatives Not Designated as Hedging Instruments | Economic Hedging | Forecasted transactions | Currency exchange contracts | Cost of Sales        
Derivative Instruments, Gain (Loss) [Line Items]        
Gain / (Loss) Recognized in Earnings (14) 43 (91) 33
Derivatives Not Designated as Hedging Instruments | Economic Hedging | Forecasted transactions | Currency exchange contracts | Selling, general and administrative expenses        
Derivative Instruments, Gain (Loss) [Line Items]        
Gain / (Loss) Recognized in Earnings $ 4 $ 5 $ 16 $ (11)