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Economic Hedges (Detail) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Derivative Instruments, Gain (Loss) [Line Items]        
Gain / (Loss) Recognized in Earnings     $ 607  
Derivatives Not Designated as Hedging Instruments | Economic Hedging        
Derivative Instruments, Gain (Loss) [Line Items]        
Gain / (Loss) Recognized in Earnings $ (176) $ (43) 330 $ (23)
Derivatives Not Designated as Hedging Instruments | Economic Hedging | Interest rate contracts | Interest and other expense, net        
Derivative Instruments, Gain (Loss) [Line Items]        
Gain / (Loss) Recognized in Earnings (1) 1   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 (18) (6) (59) 32
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 (7) (30) (10) (40)
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 (152) (9) 401 (14)
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) (2) (16) (3)
Derivatives Not Designated as Hedging Instruments | Economic Hedging | Forecasted Interest Payments | Intercompany loans | Currency exchange contracts | Interest and other expense, net        
Derivative Instruments, Gain (Loss) [Line Items]        
Gain / (Loss) Recognized in Earnings $ 7 $ 3 $ 14 $ 1