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Inventories (Tables)
 12 Months Ended
Dec. 31, 2015
Inventory Disclosure [Abstract]  
Schedule of inventories
Inventories consisted of the following (in millions):
 
December 31,
 
2015
 
2014
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
)
 
—

Inventories
$
5,898

 
$
6,623