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Financial Instruments - Derivative Instruments Fair Value and Measurement Inputs (Details) - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
Derivative [Line Items]    
Derivative fair value net asset (liability) $ 71 $ (13)
Currency exchange contracts    
Derivative [Line Items]    
Derivative fair value net asset (liability) 41 35
Commodity contracts    
Derivative [Line Items]    
Derivative fair value net asset (liability) (12) (19)
Interest rate contracts    
Derivative [Line Items]    
Derivative fair value net asset (liability) (277) (338)
Net investment hedge contracts    
Derivative [Line Items]    
Derivative fair value net asset (liability) 319 309
Quoted Prices in Active Markets for Identical Assets (Level 1)    
Derivative [Line Items]    
Derivative fair value net asset (liability) 4 (1)
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) 4 (1)
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 0
Significant Other Observable Inputs (Level 2)    
Derivative [Line Items]    
Derivative fair value net asset (liability) 67 (12)
Significant Other Observable Inputs (Level 2) | Currency exchange contracts    
Derivative [Line Items]    
Derivative fair value net asset (liability) 41 35
Significant Other Observable Inputs (Level 2) | Commodity contracts    
Derivative [Line Items]    
Derivative fair value net asset (liability) (16) (18)
Significant Other Observable Inputs (Level 2) | Interest rate contracts    
Derivative [Line Items]    
Derivative fair value net asset (liability) (277) (338)
Significant Other Observable Inputs (Level 2) | Net investment hedge contracts    
Derivative [Line Items]    
Derivative fair value net asset (liability) 319 309
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 $ 0