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PROPERTY AND EQUIPMENT, NET
 12 Months Ended
Dec. 31, 2018
Property, Plant and Equipment [Abstract]  
PROPERTY AND EQUIPMENT, NET
PROPERTY AND EQUIPMENT, NET
Property and equipment was comprised of the following at December 31, 2018 and 2017.
 
 
2018
 
2017
 
 
(in millions)
Land
 
$
20

 
$
20

Buildings and leasehold improvements
 
766

 
713

Equipment
 
890

 
824

Computer software
 
2,372

 
2,003

 
 
4,048

 
3,560

Accumulated depreciation
 
(2,313
)
 
(1,976
)
Property and equipment, net
 
$
1,735

 
$
1,584


Depreciation expense was $444 million in 2018, $410 million in 2017, and $388 million in 2016, including amortization expense for capitalized internally developed and purchased software of $298 million in 2018, $287 million in 2017, and $255 million in 2016.