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Fair Value of Derivative Instruments (Detail) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Derivatives, Fair Value [Line Items]    
Asset Derivatives $ 294 $ 422
Liability Derivatives 180 111
Derivatives Designated as Hedging Instruments
    
Derivatives, Fair Value [Line Items]    
Asset Derivatives 111 214
Liability Derivatives 21 14
Derivatives Designated as Hedging Instruments | Currency exchange contracts
    
Derivatives, Fair Value [Line Items]    
Asset Derivatives 5 3
Liability Derivatives 3 11
Derivatives Designated as Hedging Instruments | Commodity contracts
    
Derivatives, Fair Value [Line Items]    
Asset Derivatives 8 2
Liability Derivatives 18 3
Derivatives Designated as Hedging Instruments | Interest rate contracts
    
Derivatives, Fair Value [Line Items]    
Asset Derivatives 98 209
Derivatives Not Designated as Hedging Instruments
    
Derivatives, Fair Value [Line Items]    
Asset Derivatives 183 208
Liability Derivatives 159 97
Derivatives Not Designated as Hedging Instruments | Currency exchange contracts
    
Derivatives, Fair Value [Line Items]    
Asset Derivatives 29 84
Liability Derivatives 56 8
Derivatives Not Designated as Hedging Instruments | Commodity contracts
    
Derivatives, Fair Value [Line Items]    
Asset Derivatives 94 60
Liability Derivatives 68 51
Derivatives Not Designated as Hedging Instruments | Interest rate contracts
    
Derivatives, Fair Value [Line Items]    
Asset Derivatives 60 64
Liability Derivatives $ 35 $ 38