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Inventories (Tables)
6 Months Ended
Jun. 30, 2017
Inventory Disclosure [Abstract]  
Schedule of inventories
Inventories consisted of the following (in millions):
 
June 30,
2017

December 31,
2016
Refinery feedstocks
$
2,254

 
$
2,068

Refined petroleum products and blendstocks
2,941

 
3,153

Ethanol feedstocks and products
227

 
238

Materials and supplies
252

 
250

Inventories
$
5,674

 
$
5,709