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PROPERTY AND EQUIPMENT, NET
 12 Months Ended
Dec. 31, 2015
Property, Plant and Equipment [Abstract]  
Property and Equipment, Net
PROPERTY AND EQUIPMENT, NET
Property and equipment was comprised of the following at December 31, 2015 and 2014, excluding Concentra amounts classified as held-for-sale at December 31, 2014 for comparative purposes. Net property and equipment associated with Concentra and classified as held-for sale at December 31, 2014 was $191 million.
 
 
2015
 
2014
 
 
(in millions)
Land
 
$
20

 
$
18

Buildings and leasehold improvements
 
633

 
602

Equipment
 
645

 
631

Computer software
 
1,424

 
1,656

 
 
2,722

 
2,907

Accumulated depreciation
 
(1,338
)
 
(1,679
)
Property and equipment, net
 
$
1,384

 
$
1,228


Depreciation expense was $354 million in 2015, $328 million in 2014, and $309 million in 2013, including amortization expense for capitalized internally developed and purchased software of $220 million in 2015, $191 million in 2014, and $172 million in 2013.