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Inventories (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Schedule of Inventories      
Refinery feedstocks $ 2,404 $ 2,269  
Refined products and blendstocks 3,774 3,926  
Ethanol feedstocks and products 242 195  
Materials and supplies 244 233  
Inventories, before lower of cost or market inventory valuation reserve 6,664 6,623  
Lower of cost or market inventory valuation reserve (766) 0  
Inventories 5,898 6,623  
Inventories (Textual)      
Lower of cost or market inventory valuation adjustment 790 0 $ 0
Excess of market value over carrying amount of LIFO inventories   857  
Effect of LIFO inventory liquidation on income, decrease     $ 17
Inventory not valued at LIFO $ 668 $ 906