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Fair Value of Derivative Instruments (Detail) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Derivatives, Fair Value [Line Items]    
Asset Derivatives $ 871 $ 422
Liability Derivatives 208 111
Derivatives Designated as Hedging Instruments
   
Derivatives, Fair Value [Line Items]    
Asset Derivatives 126 214
Liability Derivatives 26 14
Derivatives Designated as Hedging Instruments | Currency exchange contracts
   
Derivatives, Fair Value [Line Items]    
Asset Derivatives 58 3
Liability Derivatives   11
Derivatives Designated as Hedging Instruments | Commodity contracts
   
Derivatives, Fair Value [Line Items]    
Asset Derivatives 12 2
Liability Derivatives 26 3
Derivatives Designated as Hedging Instruments | Interest rate contracts
   
Derivatives, Fair Value [Line Items]    
Asset Derivatives 56 209
Derivatives Not Designated as Hedging Instruments
   
Derivatives, Fair Value [Line Items]    
Asset Derivatives 745 208
Liability Derivatives 182 97
Derivatives Not Designated as Hedging Instruments | Currency exchange contracts
   
Derivatives, Fair Value [Line Items]    
Asset Derivatives 535 84
Liability Derivatives 12 8
Derivatives Not Designated as Hedging Instruments | Commodity contracts
   
Derivatives, Fair Value [Line Items]    
Asset Derivatives 157 60
Liability Derivatives 138 51
Derivatives Not Designated as Hedging Instruments | Interest rate contracts
   
Derivatives, Fair Value [Line Items]    
Asset Derivatives 53 64
Liability Derivatives $ 32 $ 38