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Property, Plant, and Equipment
12 Months Ended
Dec. 31, 2014
Property, Plant and Equipment [Abstract]  
PROPERTY, PLANT, AND EQUIPMENT
8.
PROPERTY, PLANT, AND EQUIPMENT

Major classes of property, plant, and equipment, which include capital lease assets, consisted of the following (in millions):
 
 
December 31,
 
 
2014
 
2013
Land
 
$
396

 
$
404

Crude oil processing facilities
 
28,054

 
27,260

Pipeline and terminal facilities
 
1,955

 
1,513

Grain processing equipment
 
779

 
719

Administrative buildings
 
800

 
800

Other
 
2,596

 
2,109

Construction in progress
 
1,353

 
1,128

Property, plant, and equipment, at cost
 
35,933

 
33,933

Accumulated depreciation
 
(9,198
)
 
(8,226
)
Property, plant, and equipment, net
 
$
26,735

 
$
25,707

We have various assets under capital leases that primarily support our refining operations totaling $72 million and $74 million as of December 31, 2014 and 2013, respectively. Accumulated amortization on assets under capital leases was $40 million and $35 million as of December 31, 2014 and 2013, respectively.
Depreciation expense for the years ended December 31, 2014, 2013, and 2012 was $1.2 billion, $1.2 billion, and $1.1 billion, respectively.