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PROPERTY AND EQUIPMENT, NET
 12 Months Ended
Dec. 31, 2016
Property, Plant and Equipment [Abstract]  
Property and Equipment, Net
PROPERTY AND EQUIPMENT, NET
Property and equipment was comprised of the following at December 31, 2016 and 2015.
 
 
2016
 
2015
 
 
(in millions)
Land
 
$
20

 
$
20

Buildings and leasehold improvements
 
681

 
633

Equipment
 
750

 
645

Computer software
 
1,744

 
1,424

 
 
3,195

 
2,722

Accumulated depreciation
 
(1,690
)
 
(1,338
)
Property and equipment, net
 
$
1,505

 
$
1,384


Depreciation expense was $388 million in 2016, $354 million in 2015, and $328 million in 2014, including amortization expense for capitalized internally developed and purchased software of $255 million in 2016, $220 million in 2015, and $191 million in 2014.