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Economic Hedges (Detail) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Derivative Instruments, Gain (Loss) [Line Items]              
Gain / (Loss) Recognized in Earnings $ 0 $ 0 $ 0 $ 97 $ 0 $ 0 $ 436
Economic Hedging | Derivatives Not Designated as Hedging Instruments              
Derivative Instruments, Gain (Loss) [Line Items]              
Gain / (Loss) Recognized in Earnings         (241) (138) 443
Economic Hedging | Derivatives Not Designated as Hedging Instruments | Commodity contracts | Cost of Sales              
Derivative Instruments, Gain (Loss) [Line Items]              
Gain / (Loss) Recognized in Earnings         (218) (101) (38)
Economic Hedging | Derivatives Not Designated as Hedging Instruments | 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 21 29
Economic Hedging | Derivatives Not Designated as Hedging Instruments | Forecasted transactions | Currency exchange contracts | Interest and other expense, net              
Derivative Instruments, Gain (Loss) [Line Items]              
Gain / (Loss) Recognized in Earnings         (2) 11 435
Economic Hedging | Derivatives Not Designated as Hedging Instruments | Forecasted transactions | Currency exchange contracts | Cost of Sales              
Derivative Instruments, Gain (Loss) [Line Items]              
Gain / (Loss) Recognized in Earnings         (37) (76) 29
Economic Hedging | Derivatives Not Designated as Hedging Instruments | Forecasted transactions | Currency exchange contracts | Selling, general and administrative expenses              
Derivative Instruments, Gain (Loss) [Line Items]              
Gain / (Loss) Recognized in Earnings         $ 3 $ 7 $ (12)