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PROPERTY AND EQUIPMENT, NET
 12 Months Ended
Dec. 31, 2017
Property, Plant and Equipment [Abstract]  
PROPERTY AND EQUIPMENT, NET
PROPERTY AND EQUIPMENT, NET
Property and equipment was comprised of the following at December 31, 2017 and 2016.
 
 
2017
 
2016
 
 
(in millions)
Land
 
$
20

 
$
20

Buildings and leasehold improvements
 
713

 
681

Equipment
 
824

 
750

Computer software
 
2,003

 
1,744

 
 
3,560

 
3,195

Accumulated depreciation
 
(1,976
)
 
(1,690
)
Property and equipment, net
 
$
1,584

 
$
1,505


Depreciation expense was $410 million in 2017, $388 million in 2016, and $354 million in 2015, including amortization expense for capitalized internally developed and purchased software of $287 million in 2017, $255 million in 2016, and $220 million in 2015.