HALLIBURTON CO | 2013 | FY | 3

Property, Plant, and Equipment
Property, plant, and equipment were composed of the following:
 
December 31
Millions of dollars
2013
2012
Land
$
213

$
145

Buildings and property improvements
2,685

1,861

Machinery, equipment, and other
17,904

16,307

Total
20,802

18,313

Less accumulated depreciation
9,480

8,056

Net property, plant, and equipment
$
11,322

$
10,257



Classes of assets, excluding oil and natural gas investments, are depreciated over the following useful lives:
 
Buildings and Property
Improvements
 
2013
2012
     1    -   10 years
13%
14%
   11    -   20 years
43%
46%
   21    -   30 years
20%
14%
   31    -   40 years
24%
26%

 
Machinery, Equipment,
and Other
 
2013
2012
     1    -    5 years
22%
20%
     6    -   10 years
72%
74%
   11    -   20 years
6%
6%

us-gaap:PropertyPlantAndEquipmentDisclosureTextBlock