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Property, Plant and Equipment
12 Months Ended
Dec. 31, 2011
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,
 
 
2011
 
2010
Land
 
$
722

 
$
624

Crude oil processing facilities
 
23,322

 
21,421

Pipeline and terminal facilities
 
856

 
709

Grain processing equipment
 
673

 
656

Retail facilities
 
1,346

 
1,277

Administrative buildings
 
712

 
705

Other
 
1,290

 
1,226

Construction in progress
 
3,332

 
2,303

Property, plant and equipment, at cost
 
32,253

 
28,921

Accumulated depreciation
 
(7,076
)
 
(6,252
)
Property, plant and equipment, net
 
$
25,177

 
$
22,669

We had crude oil processing facilities, pipeline and terminal facilities, and certain buildings and other equipment under capital leases totaling $77 million and $59 million as of December 31, 2011 and 2010, respectively. Accumulated amortization on assets under capital leases was $26 million and $22 million, respectively, as of December 31, 2011 and 2010.
Depreciation expense for the years ended December 31, 2011, 2010, and 2009 was $1.1 billion, $985 million, and $919 million, respectively.