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Financial Instruments - Derivative Instruments Fair Value and Measurement Inputs (Details) - USD ($)
$ in Millions
Mar. 31, 2020
Dec. 31, 2019
Derivative [Line Items]    
Total derivatives $ 561 $ 174
Currency exchange contracts    
Derivative [Line Items]    
Total derivatives 22 17
Commodity contracts    
Derivative [Line Items]    
Total derivatives (162) 81
Interest rate contracts    
Derivative [Line Items]    
Total derivatives 60 (171)
Net investment hedge contracts    
Derivative [Line Items]    
Total derivatives 641 247
Quoted Prices in Active Markets for Identical Assets (Level 1)    
Derivative [Line Items]    
Total derivatives (29) 27
Quoted Prices in Active Markets for Identical Assets (Level 1) | Currency exchange contracts    
Derivative [Line Items]    
Total derivatives 0 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Commodity contracts    
Derivative [Line Items]    
Total derivatives (29) 27
Quoted Prices in Active Markets for Identical Assets (Level 1) | Interest rate contracts    
Derivative [Line Items]    
Total derivatives 0 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Net investment hedge contracts    
Derivative [Line Items]    
Total derivatives 0 0
Significant Other Observable Inputs (Level 2)    
Derivative [Line Items]    
Total derivatives 590 147
Significant Other Observable Inputs (Level 2) | Currency exchange contracts    
Derivative [Line Items]    
Total derivatives 22 17
Significant Other Observable Inputs (Level 2) | Commodity contracts    
Derivative [Line Items]    
Total derivatives (133) 54
Significant Other Observable Inputs (Level 2) | Interest rate contracts    
Derivative [Line Items]    
Total derivatives 60 (171)
Significant Other Observable Inputs (Level 2) | Net investment hedge contracts    
Derivative [Line Items]    
Total derivatives 641 247
Significant Unobservable Inputs (Level 3)    
Derivative [Line Items]    
Total derivatives 0 0
Significant Unobservable Inputs (Level 3) | Currency exchange contracts    
Derivative [Line Items]    
Total derivatives 0 0
Significant Unobservable Inputs (Level 3) | Commodity contracts    
Derivative [Line Items]    
Total derivatives 0 0
Significant Unobservable Inputs (Level 3) | Interest rate contracts    
Derivative [Line Items]    
Total derivatives 0 0
Significant Unobservable Inputs (Level 3) | Net investment hedge contracts    
Derivative [Line Items]    
Total derivatives $ 0 $ 0