Inventories (Tables)

12 Months Ended

Dec. 31, 2016

Inventory Disclosure [Abstract]

Schedule of inventories

Inventories consisted of the following (in millions):

	December 31,
	2016		2015
Refinery feedstocks	$	2,068	$	2,404
Refined petroleum products and blendstocks	3,153		3,774
Ethanol feedstocks and products	238		242
Materials and supplies	250		244
Inventories, before lower of cost or market inventory valuation reserve	5,709		6,664
Lower of cost or market inventory valuation reserve	—		(766		)
Inventories	$	5,709	$	5,898