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Derivatives and Fair Value of Financial Instruments - Fair Value of Derivatives (Details)
$ in Millions
12 Months Ended
Dec. 31, 2019
USD ($)
item
Dec. 31, 2018
USD ($)
Commodities    
Fair value of each type of derivative and its location in the Consolidated Balance Sheets    
Margin account $ 13 $ 15
Commodities | Other current assets    
Fair value of each type of derivative and its location in the Consolidated Balance Sheets    
Asset Derivatives 6 6
Derivative assets and liabilities, net basis 15 17
Commodities | Other current liabilities    
Fair value of each type of derivative and its location in the Consolidated Balance Sheets    
Liability Derivatives $ 4 4
Foreign currencies    
Fair value of each type of derivative and its location in the Consolidated Balance Sheets    
Number of counterparties | item 3  
Foreign currencies | Maximum    
Fair value of each type of derivative and its location in the Consolidated Balance Sheets    
Credit risk associated with derivative contracts $ 1  
Foreign currencies | Other current assets    
Fair value of each type of derivative and its location in the Consolidated Balance Sheets    
Asset Derivatives   2
Foreign currencies | Other current liabilities    
Fair value of each type of derivative and its location in the Consolidated Balance Sheets    
Liability Derivatives $ 3  
Equity futures contract | Short term investments    
Fair value of each type of derivative and its location in the Consolidated Balance Sheets    
Liability Derivatives   $ 5