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Property and Equipment
9 Months Ended
Sep. 30, 2014
Property, Plant and Equipment [Abstract]  
Property and Equipment
Property and Equipment
Property and equipment consisted of the following (in millions): 
 
September 30,
2014
 
December 31,
2013
Land
$
153

 
$
45

Buildings
1,347

 
1,071

Leasehold improvements
279

 
203

Network equipment
2,704

 
2,351

Computer software, office equipment and other
134

 
95

Construction in progress
702

 
377

Total
5,319

 
4,142

Less: Accumulated depreciation
(1,616
)
 
(1,260
)
Property and equipment, net
$
3,703

 
$
2,882


Construction in progress includes costs primarily related to the expansion of our corporate headquarters in Menlo Park, California, construction of data centers, and network equipment infrastructure to support our data centers around the world. No interest was capitalized during the three months ended September 30, 2014 and 2013, and the nine months ended September 30, 2014. Interest capitalized during the nine months ended September 30, 2013 was not material.