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Economic Hedges (Detail) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Derivative Instruments, Gain (Loss) [Line Items]        
Gain / (Loss) Recognized in Earnings     $ 436 $ 413
Derivatives Not Designated as Hedging Instruments | Economic Hedging        
Derivative Instruments, Gain (Loss) [Line Items]        
Gain / (Loss) Recognized in Earnings $ (7) $ 411 323 388
Derivatives Not Designated as Hedging Instruments | Economic Hedging | Interest rate contracts | Interest and other expense / (income)        
Derivative Instruments, Gain (Loss) [Line Items]        
Gain / (Loss) Recognized in Earnings   (1)    
Derivatives Not Designated as Hedging Instruments | Economic Hedging | Commodity contracts | Cost of Sales        
Derivative Instruments, Gain (Loss) [Line Items]        
Gain / (Loss) Recognized in Earnings (99) (36) (158) (4)
Derivatives Not Designated as Hedging Instruments | Economic Hedging | Intercompany loans and forecasted interest payments | Currency exchange contracts | Interest and other expense / (income)        
Derivative Instruments, Gain (Loss) [Line Items]        
Gain / (Loss) Recognized in Earnings 8 4 22 5
Derivatives Not Designated as Hedging Instruments | Economic Hedging | Forecasted transactions | Currency exchange contracts | Interest and other expense / (income)        
Derivative Instruments, Gain (Loss) [Line Items]        
Gain / (Loss) Recognized in Earnings 36 419 437 405
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 43 29 33 (11)
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 $ 5 $ (4) $ (11) $ (7)