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Financial Instruments - Derivative Instruments Fair Value and Measurement Inputs (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Derivative [Line Items]    
Total derivatives $ (251) $ 174
Currency exchange contracts    
Derivative [Line Items]    
Total derivatives 15 17
Commodity contracts    
Derivative [Line Items]    
Total derivatives 77 81
Interest rate contracts    
Derivative [Line Items]    
Total derivatives (328) (171)
Net investment hedge contracts    
Derivative [Line Items]    
Total derivatives (15) 247
Quoted Prices in Active Markets for Identical Assets (Level 1)    
Derivative [Line Items]    
Total derivatives 46 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 46 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 (297) 147
Significant Other Observable Inputs (Level 2) | Currency exchange contracts    
Derivative [Line Items]    
Total derivatives 15 17
Significant Other Observable Inputs (Level 2) | Commodity contracts    
Derivative [Line Items]    
Total derivatives 31 54
Significant Other Observable Inputs (Level 2) | Interest rate contracts    
Derivative [Line Items]    
Total derivatives (328) (171)
Significant Other Observable Inputs (Level 2) | Net investment hedge contracts    
Derivative [Line Items]    
Total derivatives (15) 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