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Property, Plant and Equipment
12 Months Ended
Dec. 31, 2013
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment
Property, Plant and Equipment
Property, plant and equipment consist of (table in millions):
 
December 31,
2013
 
December 31,
2012
Furniture and fixtures
$
229

 
$
197

Equipment and software
5,973

 
5,345

Buildings and improvements
2,089

 
1,873

Land
132

 
121

Building construction in progress
215

 
197

 
8,638

 
7,733

Accumulated depreciation
(5,160
)
 
(4,588
)
 
$
3,478

 
$
3,145


Depreciation expense was $867 million, $780 million and $728 million in 2013, 2012 and 2011, respectively. Building construction in progress at December 31, 2013 includes $74 million for facilities not yet placed in service that we are holding for future use.