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Derivative Instruments Fair Value and Measurement Inputs (Detail) - USD ($)
$ in Millions
Jun. 30, 2016
Dec. 31, 2015
Derivative [Line Items]    
Derivative fair value net asset (liability) $ 18 $ 27
Currency exchange contracts    
Derivative [Line Items]    
Derivative fair value net asset (liability) (56) 41
Commodity contracts    
Derivative [Line Items]    
Derivative fair value net asset (liability) 51 16
Interest rate contracts    
Derivative [Line Items]    
Derivative fair value net asset (liability) 23 (30)
Quoted Prices In Active Markets For Identical Assets (Level 1)    
Derivative [Line Items]    
Derivative fair value net asset (liability) 29 29
Quoted Prices In Active Markets For Identical Assets (Level 1) | Commodity contracts    
Derivative [Line Items]    
Derivative fair value net asset (liability) 29 29
Significant Other Observable Inputs (Level 2)    
Derivative [Line Items]    
Derivative fair value net asset (liability) (11) (2)
Significant Other Observable Inputs (Level 2) | Currency exchange contracts    
Derivative [Line Items]    
Derivative fair value net asset (liability) (56) 41
Significant Other Observable Inputs (Level 2) | Commodity contracts    
Derivative [Line Items]    
Derivative fair value net asset (liability) 22 (13)
Significant Other Observable Inputs (Level 2) | Interest rate contracts    
Derivative [Line Items]    
Derivative fair value net asset (liability) $ 23 $ (30)