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Derivatives and Fair Value of Financial Instruments - Fair Value of Derivatives (Details)
$ in Millions
12 Months Ended
Dec. 31, 2017
USD ($)
item
Dec. 31, 2016
USD ($)
Commodities    
Fair value of each type of derivative and its location in the Consolidated Balance Sheets    
Margin account $ 20 $ 10
Commodities | Other current assets    
Fair value of each type of derivative and its location in the Consolidated Balance Sheets    
Asset Derivatives 4 3
Derivative assets and liabilities, net basis 18 12
Commodities | Other current liabilities    
Fair value of each type of derivative and its location in the Consolidated Balance Sheets    
Liability Derivatives 6 1
Foreign currencies    
Fair value of each type of derivative and its location in the Consolidated Balance Sheets    
Credit risk associated with derivative contracts $ 3  
Number of counterparties | item 6  
Foreign currencies | Other current assets    
Fair value of each type of derivative and its location in the Consolidated Balance Sheets    
Asset Derivatives $ 3 1
Foreign currencies | Other current liabilities    
Fair value of each type of derivative and its location in the Consolidated Balance Sheets    
Liability Derivatives $ 6 4
Interest rate swaps | Other current liabilities    
Fair value of each type of derivative and its location in the Consolidated Balance Sheets    
Liability Derivatives   $ 4