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Derivative Instruments Fair Value and Measurement Inputs (Detail) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Derivative [Line Items]    
Derivative fair value net asset (liability) $ (646) $ 34
Currency exchange contracts    
Derivative [Line Items]    
Derivative fair value net asset (liability) (11) (3)
Commodity contracts    
Derivative [Line Items]    
Derivative fair value net asset (liability) (145) (60)
Interest rate contracts    
Derivative [Line Items]    
Derivative fair value net asset (liability) (490) 97
Quoted Prices In Active Markets For Identical Assets (Level 1)    
Derivative [Line Items]    
Derivative fair value net asset (liability) (138) (86)
Quoted Prices In Active Markets For Identical Assets (Level 1) | Currency exchange contracts    
Derivative [Line Items]    
Derivative fair value net asset (liability) 0 0
Quoted Prices In Active Markets For Identical Assets (Level 1) | Commodity contracts    
Derivative [Line Items]    
Derivative fair value net asset (liability) (138) (86)
Quoted Prices In Active Markets For Identical Assets (Level 1) | Interest rate contracts    
Derivative [Line Items]    
Derivative fair value net asset (liability) 0 0
Significant Other Observable Inputs (Level 2)    
Derivative [Line Items]    
Derivative fair value net asset (liability) (508) 120
Significant Other Observable Inputs (Level 2) | Currency exchange contracts    
Derivative [Line Items]    
Derivative fair value net asset (liability) (11) (3)
Significant Other Observable Inputs (Level 2) | Commodity contracts    
Derivative [Line Items]    
Derivative fair value net asset (liability) (7) 26
Significant Other Observable Inputs (Level 2) | Interest rate contracts    
Derivative [Line Items]    
Derivative fair value net asset (liability) (490) 97
Significant Unobservable Inputs (Level 3)    
Derivative [Line Items]    
Derivative fair value net asset (liability) 0 0
Significant Unobservable Inputs (Level 3) | Currency exchange contracts    
Derivative [Line Items]    
Derivative fair value net asset (liability) 0 0
Significant Unobservable Inputs (Level 3) | Commodity contracts    
Derivative [Line Items]    
Derivative fair value net asset (liability) 0 0
Significant Unobservable Inputs (Level 3) | Interest rate contracts    
Derivative [Line Items]    
Derivative fair value net asset (liability) $ 0 $ 0