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Derivatives and Fair Value of Financial Instruments - Fair Value of Derivatives (Details)
$ in Millions
12 Months Ended
Dec. 31, 2016
USD ($)
item
Dec. 31, 2015
USD ($)
Fair value of each type of derivative and its location in the Consolidated Balance Sheets    
Number of counterparties | item 2  
Commodities    
Fair value of each type of derivative and its location in the Consolidated Balance Sheets    
Margin account $ 10 $ 29
Commodities | Other current assets    
Fair value of each type of derivative and its location in the Consolidated Balance Sheets    
Asset Derivatives 3 4
Derivative assets and liabilities, net basis 12 15
Commodities | Other current liabilities    
Fair value of each type of derivative and its location in the Consolidated Balance Sheets    
Liability Derivatives 1 18
Foreign currencies    
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 1 8
Foreign currencies | Other current liabilities    
Fair value of each type of derivative and its location in the Consolidated Balance Sheets    
Liability Derivatives 4  
Interest rate swaps    
Fair value of each type of derivative and its location in the Consolidated Balance Sheets    
Credit risk associated with derivative contracts 0  
Interest rate swaps | Other current liabilities    
Fair value of each type of derivative and its location in the Consolidated Balance Sheets    
Liability Derivatives $ 4 $ 6