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Fair Value of Derivative Instruments (Detail) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Derivatives, Fair Value [Line Items]    
Asset Derivatives $ 385 $ 422
Liability Derivatives 152 111
Derivatives Designated as Hedging Instruments
    
Derivatives, Fair Value [Line Items]    
Asset Derivatives 177 214
Liability Derivatives 18 14
Derivatives Designated as Hedging Instruments | Foreign exchange contracts
    
Derivatives, Fair Value [Line Items]    
Asset Derivatives 3 3
Liability Derivatives 7 11
Derivatives Designated as Hedging Instruments | Commodity contracts
    
Derivatives, Fair Value [Line Items]    
Asset Derivatives 38 2
Liability Derivatives 11 3
Derivatives Designated as Hedging Instruments | Interest rate contracts
    
Derivatives, Fair Value [Line Items]    
Asset Derivatives 136 209
Derivatives Not Designated as Hedging Instruments
    
Derivatives, Fair Value [Line Items]    
Asset Derivatives 208 208
Liability Derivatives 134 97
Derivatives Not Designated as Hedging Instruments | Foreign exchange contracts
    
Derivatives, Fair Value [Line Items]    
Asset Derivatives 46 84
Liability Derivatives 22 8
Derivatives Not Designated as Hedging Instruments | Commodity contracts
    
Derivatives, Fair Value [Line Items]    
Asset Derivatives 103 60
Liability Derivatives 76 51
Derivatives Not Designated as Hedging Instruments | Interest rate contracts
    
Derivatives, Fair Value [Line Items]    
Asset Derivatives 59 64
Liability Derivatives $ 36 $ 38