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Derivative Instruments Fair Value and Measurement Inputs (Detail) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Derivative [Line Items]    
Derivative fair value net asset (liability) $ 311 $ (1)
Foreign exchange contracts
    
Derivative [Line Items]    
Derivative fair value net asset (liability) 68 (21)
Commodity contracts
    
Derivative [Line Items]    
Derivative fair value net asset (liability) 8 (28)
Interest rate contracts
    
Derivative [Line Items]    
Derivative fair value net asset (liability) 235 48
Quoted Prices In Active Markets For Identical Assets (Level 1)
    
Derivative [Line Items]    
Derivative fair value net asset (liability) (4) (53)
Quoted Prices In Active Markets For Identical Assets (Level 1) | Commodity contracts
    
Derivative [Line Items]    
Derivative fair value net asset (liability) (4) (53)
Significant Other Observable Inputs (Level 2)
    
Derivative [Line Items]    
Derivative fair value net asset (liability) 315 52
Significant Other Observable Inputs (Level 2) | Foreign exchange contracts
    
Derivative [Line Items]    
Derivative fair value net asset (liability) 68 (21)
Significant Other Observable Inputs (Level 2) | Commodity contracts
    
Derivative [Line Items]    
Derivative fair value net asset (liability) 12 25
Significant Other Observable Inputs (Level 2) | Interest rate contracts
    
Derivative [Line Items]    
Derivative fair value net asset (liability) $ 235 $ 48