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Economic Hedges (Detail) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Derivative Instruments, Gain (Loss) [Line Items]                  
Gain / (Loss) Recognized in Earnings $ 29 $ (144) $ 551 $ 215 $ 420 $ (7) $ 436 $ 628  
Derivatives Not Designated as Hedging Instruments | Economic Hedging                  
Derivative Instruments, Gain (Loss) [Line Items]                  
Gain / (Loss) Recognized in Earnings             443 503 $ 56
Derivatives Not Designated as Hedging Instruments | Economic Hedging | Commodity contracts | Cost of Sales                  
Derivative Instruments, Gain (Loss) [Line Items]                  
Gain / (Loss) Recognized in Earnings             (38) (136) (40)
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             29 4 18
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             435 610 9
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             29 29 65
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             $ (12) $ (4) $ 4