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Financial Instruments - Summary of Notional Amount and Gross Fair Value (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Derivative [Line Items]    
Notional Amounts $ 9,831 $ 12,112
Derivatives Assets 200 167
Derivative Liabilities 81 99
Prepaid Expenses and Other Current Assets    
Derivative [Line Items]    
Derivatives Assets 110  
Other Noncurrent Assets    
Derivative [Line Items]    
Derivatives Assets 90  
Other Current Liabilities    
Derivative [Line Items]    
Derivative Liabilities 70  
Other Noncurrent Liabilities    
Derivative [Line Items]    
Derivative Liabilities 11  
Derivatives Not Designated as Hedging Instruments:    
Derivative [Line Items]    
Notional Amounts 7,553 9,713
Derivatives Assets 113 111
Derivative Liabilities 67 92
Derivatives Not Designated as Hedging Instruments: | Balance sheet items    
Derivative [Line Items]    
Notional Amounts 6,470 7,936
Derivatives Assets 72 62
Derivative Liabilities 48 37
Derivatives Not Designated as Hedging Instruments: | Forecasted transactions    
Derivative [Line Items]    
Notional Amounts 823 748
Derivatives Assets 16 14
Derivative Liabilities 12 15
Derivatives Not Designated as Hedging Instruments: | Cross-currency swaps    
Derivative [Line Items]    
Notional Amounts 260 1,029
Derivatives Assets 24 35
Derivative Liabilities 7 40
Derivatives Not Designated as Hedging Instruments: | Commodity contracts    
Derivative [Line Items]    
Derivatives Assets 1 0
Derivative Liabilities 0 0
Derivatives Designated as Hedging Instruments:    
Derivative [Line Items]    
Notional Amounts 2,278 2,399
Derivatives Assets 87 56
Derivative Liabilities 14 7
Derivatives Designated as Hedging Instruments: | Balance sheet items    
Derivative [Line Items]    
Notional Amounts 0 27
Derivatives Assets 0 2
Derivative Liabilities 0 3
Derivatives Designated as Hedging Instruments: | Forecasted transactions    
Derivative [Line Items]    
Notional Amounts 355 464
Derivatives Assets 20 9
Derivative Liabilities 14 3
Derivatives Designated as Hedging Instruments: | Commodity contracts    
Derivative [Line Items]    
Derivatives Assets 3 6
Derivative Liabilities 0 1
Derivatives Designated as Hedging Instruments: | Interest rate swaps    
Derivative [Line Items]    
Notional Amounts 1,923 1,908
Derivatives Assets 64 39
Derivative Liabilities $ 0 $ 0