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Financial Instruments - Schedule of Derivative Instruments in Statement of Financial Position, Fair Value (Details) - USD ($)
$ in Millions
Sep. 30, 2020
Dec. 31, 2019
Derivative [Line Items]    
Notional Amounts $ 10,411 $ 12,112
Fair Value, Assets 148 167
Fair Value, Liabilities 131 99
Prepaid and other current assets    
Derivative [Line Items]    
Fair Value, Assets 47  
Other long-term assets    
Derivative [Line Items]    
Fair Value, Assets 101  
Other current liabilities    
Derivative [Line Items]    
Fair Value, Liabilities 119  
Other long-term liabilities    
Derivative [Line Items]    
Fair Value, Liabilities 12  
Derivatives Not Designated as Hedging Instruments:    
Derivative [Line Items]    
Notional Amounts 8,093 9,713
Fair Value, Assets 82 111
Fair Value, Liabilities 115 92
Derivatives Not Designated as Hedging Instruments: | Balance sheet items    
Derivative [Line Items]    
Notional Amounts 6,714 7,936
Fair Value, Assets 30 62
Fair Value, Liabilities 97 37
Derivatives Not Designated as Hedging Instruments: | Forecasted transactions    
Derivative [Line Items]    
Notional Amounts 952 748
Fair Value, Assets 6 14
Fair Value, Liabilities 12 15
Derivatives Not Designated as Hedging Instruments: | Cross-currency swaps    
Derivative [Line Items]    
Notional Amounts 427 1,029
Fair Value, Assets 45 35
Fair Value, Liabilities 6 40
Derivatives Not Designated as Hedging Instruments: | Commodity contracts    
Derivative [Line Items]    
Fair Value, Assets 1 0
Fair Value, Liabilities 0 0
Derivatives Designated as Hedging Instruments:    
Derivative [Line Items]    
Notional Amounts 2,318 2,399
Fair Value, Assets 66 56
Fair Value, Liabilities 16 7
Derivatives Designated as Hedging Instruments: | Balance sheet items    
Derivative [Line Items]    
Notional Amounts 0 27
Fair Value, Assets   2
Fair Value, Liabilities   3
Derivatives Designated as Hedging Instruments: | Forecasted transactions    
Derivative [Line Items]    
Notional Amounts 479 464
Fair Value, Assets 6 9
Fair Value, Liabilities 14 3
Derivatives Designated as Hedging Instruments: | Commodity contracts    
Derivative [Line Items]    
Fair Value, Assets 1 6
Fair Value, Liabilities 2 1
Derivatives Designated as Hedging Instruments: | Interest rate swaps    
Derivative [Line Items]    
Notional Amounts 1,839 1,908
Fair Value, Assets 59 $ 39
Fair Value, Liabilities $ 0