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Fair Value of Derivative Instruments (Detail) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Derivatives, Fair Value [Line Items]    
Asset Derivatives $ 422 $ 240
Liability Derivatives 111 241
Derivatives Designated as Hedging Instruments
    
Derivatives, Fair Value [Line Items]    
Asset Derivatives 214 25
Liability Derivatives 14 44
Derivatives Designated as Hedging Instruments | Foreign exchange contracts
    
Derivatives, Fair Value [Line Items]    
Asset Derivatives 3 6
Liability Derivatives 11 10
Derivatives Designated as Hedging Instruments | Commodity contracts
    
Derivatives, Fair Value [Line Items]    
Asset Derivatives 2 3
Liability Derivatives 3 34
Derivatives Designated as Hedging Instruments | Interest rate contracts
    
Derivatives, Fair Value [Line Items]    
Asset Derivatives 209 16
Derivatives Not Designated as Hedging Instruments
    
Derivatives, Fair Value [Line Items]    
Asset Derivatives 208 215
Liability Derivatives 97 197
Derivatives Not Designated as Hedging Instruments | Foreign exchange contracts
    
Derivatives, Fair Value [Line Items]    
Asset Derivatives 84 16
Liability Derivatives 8 33
Derivatives Not Designated as Hedging Instruments | Commodity contracts
    
Derivatives, Fair Value [Line Items]    
Asset Derivatives 60 106
Liability Derivatives 51 103
Derivatives Not Designated as Hedging Instruments | Interest rate contracts
    
Derivatives, Fair Value [Line Items]    
Asset Derivatives 64 93
Liability Derivatives $ 38 $ 61