Property and Equipment, Net

12 Months Ended

Dec. 31, 2017

Property and equipment, net was comprised of the following (amounts in millions):



	At December 31,
	2017			2016
Land	$	1		$	1
Buildings	4			4
Leasehold improvements	224			162
Computer equipment	658			560
Office furniture and other equipment	92			78
Total cost of property and equipment	979			805
Less accumulated depreciation	(685		)	(547		)
Property and equipment, net	$	294		$	258

Depreciation expense for the years ended December 31, 2017, 2016, and 2015 was $130 million, $121 million, and $82 million, respectively.

Rental expense was $71 million, $65 million and $39 million for the years ended December 31, 2017, 2016, and 2015, respectively.