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Economic Hedges (Detail) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Derivative Instruments, Gain (Loss) [Line Items]    
Gain / (Loss) Recognized in Earnings   $ 551
Derivatives Not Designated as Hedging Instruments | Economic Hedging    
Derivative Instruments, Gain (Loss) [Line Items]    
Gain / (Loss) Recognized in Earnings $ (58) 506
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
Derivatives Not Designated as Hedging Instruments | Economic Hedging | Commodity contracts | Cost of Sales    
Derivative Instruments, Gain (Loss) [Line Items]    
Gain / (Loss) Recognized in Earnings (44) (41)
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 5 7
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 8 553
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 (31) (3)
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 $ (11)