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Derivative Instruments Fair Value and Measurement Inputs (Detail) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Derivative [Line Items]    
Derivative fair value net asset (liability) $ 233 $ 311
Foreign exchange contracts
    
Derivative [Line Items]    
Derivative fair value net asset (liability) 20 68
Commodity contracts
    
Derivative [Line Items]    
Derivative fair value net asset (liability) 54 8
Interest rate contracts
    
Derivative [Line Items]    
Derivative fair value net asset (liability) 159 235
Quoted Prices In Active Markets For Identical Assets (Level 1)
    
Derivative [Line Items]    
Derivative fair value net asset (liability) 30 (4)
Quoted Prices In Active Markets For Identical Assets (Level 1) | Commodity contracts
    
Derivative [Line Items]    
Derivative fair value net asset (liability) 30 (4)
Significant Other Observable Inputs (Level 2)
    
Derivative [Line Items]    
Derivative fair value net asset (liability) 203 315
Significant Other Observable Inputs (Level 2) | Foreign exchange contracts
    
Derivative [Line Items]    
Derivative fair value net asset (liability) 20 68
Significant Other Observable Inputs (Level 2) | Commodity contracts
    
Derivative [Line Items]    
Derivative fair value net asset (liability) 24 12
Significant Other Observable Inputs (Level 2) | Interest rate contracts
    
Derivative [Line Items]    
Derivative fair value net asset (liability) $ 159 $ 235