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Derivative Instruments Fair Value and Measurement Inputs (Detail) - USD ($)
$ in Millions
Jun. 30, 2015
Dec. 31, 2014
Derivative [Line Items]    
Derivative fair value net asset (liability) $ (160) $ 629
Currency exchange contracts    
Derivative [Line Items]    
Derivative fair value net asset (liability) (182) 763
Commodity contracts    
Derivative [Line Items]    
Derivative fair value net asset (liability) (7) (125)
Interest rate contracts    
Derivative [Line Items]    
Derivative fair value net asset (liability) 29 (9)
Quoted Prices In Active Markets For Identical Assets (Level 1)    
Derivative [Line Items]    
Derivative fair value net asset (liability) (10) (49)
Quoted Prices In Active Markets For Identical Assets (Level 1) | Commodity contracts    
Derivative [Line Items]    
Derivative fair value net asset (liability) (10) (49)
Significant Other Observable Inputs (Level 2)    
Derivative [Line Items]    
Derivative fair value net asset (liability) (150) 678
Significant Other Observable Inputs (Level 2) | Currency exchange contracts    
Derivative [Line Items]    
Derivative fair value net asset (liability) (182) 763
Significant Other Observable Inputs (Level 2) | Commodity contracts    
Derivative [Line Items]    
Derivative fair value net asset (liability) 3 (76)
Significant Other Observable Inputs (Level 2) | Interest rate contracts    
Derivative [Line Items]    
Derivative fair value net asset (liability) $ 29 $ (9)