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Fair Value Measurements and Financial Instruments - Fair Value of Derivative Instruments and Other Financial Instruments (Details) - USD ($)
$ in Millions
Jun. 30, 2021
Dec. 31, 2020
Designated derivative instruments    
Derivative assets $ 24 $ 29
Derivative liabilities 60 93
Other financial instruments    
Total other financial instruments 70 37
Other assets | Interest rate swap contracts    
Designated derivative instruments    
Derivative assets 10 14
Other assets | Forward-starting interest rate swaps    
Designated derivative instruments    
Derivative assets 3 5
Other current assets    
Other financial instruments    
Marketable securities 70 37
Other current assets | Foreign currency contracts    
Designated derivative instruments    
Derivative assets 10 7
Other current assets | Commodity contracts    
Designated derivative instruments    
Derivative assets 1 3
Other liabilities | Interest rate swap contracts    
Designated derivative instruments    
Derivative liabilities 0 0
Other liabilities | Forward-starting interest rate swaps    
Designated derivative instruments    
Derivative liabilities 0 0
Other accruals | Foreign currency contracts    
Designated derivative instruments    
Derivative liabilities 60 93
Other accruals | Commodity contracts    
Designated derivative instruments    
Derivative liabilities $ 0 $ 0