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Property, Plant and Equipment
12 Months Ended
Dec. 31, 2012
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,
 
 
2012
 
2011
Land
 
$
802

 
$
722

Crude oil processing facilities
 
24,865

 
23,322

Pipeline and terminal facilities
 
1,471

 
856

Grain processing equipment
 
694

 
673

Retail facilities
 
1,480

 
1,346

Administrative buildings
 
734

 
712

Other
 
1,457

 
1,290

Construction in progress
 
2,629

 
3,332

Property, plant and equipment, at cost
 
34,132

 
32,253

Accumulated depreciation
 
(7,832
)
 
(7,076
)
Property, plant and equipment, net
 
$
26,300

 
$
25,177

We have miscellaneous assets under capital leases that primarily support our refining operations totaling $83 million and $77 million as of December 31, 2012 and 2011, respectively. Accumulated amortization on assets under capital leases was $35 million and $26 million, respectively, as of December 31, 2012 and 2011.
Depreciation expense for the years ended December 31, 2012, 2011, and 2010 was $1.1 billion, $1.1 billion, and $985 million, respectively.