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Financial Instruments - Derivative Instruments Fair Value and Measurement Inputs (Details) - USD ($)
$ in Millions
Jun. 30, 2018
Dec. 31, 2017
Derivative [Line Items]    
Derivative fair value net asset (liability) $ 157 $ (646)
Currency exchange contracts    
Derivative [Line Items]    
Derivative fair value net asset (liability) 58 (11)
Commodity contracts    
Derivative [Line Items]    
Derivative fair value net asset (liability) 95 (145)
Interest rate contracts    
Derivative [Line Items]    
Derivative fair value net asset (liability) (381) (490)
Net investment hedge contracts    
Derivative [Line Items]    
Derivative fair value net asset (liability) 385  
Quoted Prices in Active Markets for Identical Assets (Level 1)    
Derivative [Line Items]    
Derivative fair value net asset (liability) 65 (138)
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) 65 (138)
Quoted Prices in Active Markets for Identical Assets (Level 1) | Interest rate contracts    
Derivative [Line Items]    
Derivative fair value net asset (liability) 0 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Net investment hedge contracts    
Derivative [Line Items]    
Derivative fair value net asset (liability) 0  
Significant Other Observable Inputs (Level 2)    
Derivative [Line Items]    
Derivative fair value net asset (liability) 92 (508)
Significant Other Observable Inputs (Level 2) | Currency exchange contracts    
Derivative [Line Items]    
Derivative fair value net asset (liability) 58 (11)
Significant Other Observable Inputs (Level 2) | Commodity contracts    
Derivative [Line Items]    
Derivative fair value net asset (liability) 30 (7)
Significant Other Observable Inputs (Level 2) | Interest rate contracts    
Derivative [Line Items]    
Derivative fair value net asset (liability) (381) (490)
Significant Other Observable Inputs (Level 2) | Net investment hedge contracts    
Derivative [Line Items]    
Derivative fair value net asset (liability) 385  
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
Significant Unobservable Inputs (Level 3) | Net investment hedge contracts    
Derivative [Line Items]    
Derivative fair value net asset (liability) $ 0