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Derivative Instruments Fair Value and Measurement Inputs (Detail) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Derivative [Line Items]    
Derivative fair value net asset (liability) $ 663 $ 311
Currency exchange contracts
    
Derivative [Line Items]    
Derivative fair value net asset (liability) 581 68
Commodity contracts
    
Derivative [Line Items]    
Derivative fair value net asset (liability) 5 8
Interest rate contracts
    
Derivative [Line Items]    
Derivative fair value net asset (liability) 77 235
Quoted Prices In Active Markets For Identical Assets (Level 1)
    
Derivative [Line Items]    
Derivative fair value net asset (liability) (10) (4)
Quoted Prices In Active Markets For Identical Assets (Level 1) | Commodity contracts
    
Derivative [Line Items]    
Derivative fair value net asset (liability) (10) (4)
Significant Other Observable Inputs (Level 2)
    
Derivative [Line Items]    
Derivative fair value net asset (liability) 673 315
Significant Other Observable Inputs (Level 2) | Currency exchange contracts
    
Derivative [Line Items]    
Derivative fair value net asset (liability) 581 68
Significant Other Observable Inputs (Level 2) | Commodity contracts
    
Derivative [Line Items]    
Derivative fair value net asset (liability) 15 12
Significant Other Observable Inputs (Level 2) | Interest rate contracts
    
Derivative [Line Items]    
Derivative fair value net asset (liability) $ 77 $ 235