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Property, Plant, and Equipment
12 Months Ended
Dec. 31, 2015
Property, Plant and Equipment [Abstract]  
PROPERTY, PLANT, AND EQUIPMENT
7.
PROPERTY, PLANT, AND EQUIPMENT

Major classes of property, plant, and equipment, which include capital lease assets, consisted of the following (in millions):
 
 
December 31,
 
 
2015
 
2014
Land
 
$
400

 
$
396

Crude oil processing facilities
 
28,278

 
27,629

Pipeline and terminal facilities
 
2,456

 
2,380

Grain processing equipment
 
792

 
779

Administrative buildings
 
789

 
789

Other
 
3,019

 
2,607

Construction in progress
 
1,173

 
1,353

Property, plant, and equipment, at cost
 
36,907

 
35,933

Accumulated depreciation
 
(10,204
)
 
(9,198
)
Property, plant, and equipment, net
 
$
26,703

 
$
26,735


We have various assets under capital leases that primarily support our refining operations totaling $134 million and $72 million as of December 31, 2015 and 2014, respectively. Accumulated amortization on assets under capital leases was $50 million and $40 million as of December 31, 2015 and 2014, respectively.

Depreciation expense for the years ended December 31, 2015, 2014, and 2013 was $1.3 billion, $1.2 billion, and $1.2 billion, respectively.