PROPERTY AND EQUIPMENT, NET

12 Months Ended

Dec. 31, 2020

Property, Plant and Equipment [Abstract]

Property and equipment, net at December 31, 2020 and 2019 consist of the following (in millions):


	2020		2019		Estimated Useful Lives (years)
Computer equipment	$	746	$	736	2 to 6 years
Capitalized software	565		442		2 to 5 years
Leasehold improvements	278		265		1 to 15 years
Office equipment, furniture and fixtures	63		61		2 to 8 years

Building construction-in-progress	257		161
Total	1,909		1,665
Less: Accumulated depreciation	(1,153)		(927)
Property and equipment, net	$	756	$	738

Depreciation expense was $291 million, $294 million and $248 million for the years ended December 31, 2020, 2019 and 2018, respectively. Additions to capitalized software during the years ended December 31, 2020, 2019 and 2018 were $144 million, $109 million and $103 million, respectively.