Property, Plant, and Equipment

12 Months Ended

Dec. 31, 2017

Property, Plant and Equipment [Abstract]


5.	PROPERTY, PLANT, AND EQUIPMENT

Major classes of property, plant, and equipment, including assets held under capital leases, consisted of the following (in millions):



	December 31,
	2017			2016
Land	$	411		$	400
Crude oil processing facilities	30,109			29,754
Transportation and terminaling facilities	4,335			3,692
Grain processing equipment	903			855
Administrative buildings	910			838
Other	2,068			1,464
Construction in progress	1,274			730
Property, plant, and equipment, at cost	40,010			37,733
Accumulated depreciation	(12,530		)	(11,261		)
Property, plant, and equipment, net	$	27,480		$	26,472

We have various assets under capital leases that primarily support our refining operations totaling $635 million and $118 million as of December 31, 2017 and 2016, respectively. Accumulated amortization on assets under capital leases was $72 million and $45 million as of December 31, 2017 and 2016, respectively.

Depreciation expense was $1.3 billion for each of the years in the three-year period ended December 31, 2017.