Property and Equipment

12 Months Ended

Dec. 31, 2021

Property, Plant and Equipment [Abstract]

Property and equipment, net consists of the following (in millions):


	December 31,
	2021		2020
Land	$	1,688	$	1,326
Servers and network assets	25,584		20,544
Buildings	22,531		17,360
Leasehold improvements	5,795		4,321
Equipment and other	4,764		3,917
Finance lease right-of-use assets	2,840		2,295
Construction in progress	14,687		11,288
Property and equipment, gross	77,889		61,051
Less: Accumulated depreciation	(20,080)		(15,418)
Property and equipment, net	$	57,809	$	45,633

Construction in progress includes costs mostly related to construction of data centers, network infrastructure, and office buildings. Prior year balances of certain property and equipment categories have been reclassified to conform to the current year's presentation.

Depreciation expense on property and equipment was $7.56 billion, $6.39 billion, and $5.18 billion for the years ended December 31, 2021, 2020, and 2019, respectively. The majority of the property and equipment depreciation expense was from servers and network assets depreciation of $4.94 billion, $4.38 billion, and $3.69 billion for the years ended December 31, 2021, 2020, and 2019, respectively.