
	As of December 31,
	2021			2022			2022
	RMB			RMB			US$
	(In millions)
Computer equipment		40,908			44,246			6,415
Office building		4,915			5,125			743
Office building related facility, machinery and equipment		3,834			4,195			608
Vehicles		291			676			98
Office equipment		1,223			1,237			179
Leasehold improvements		496			490			71
Construction in progress		688			291			43

		52,355			56,260			8,157
Accumulated depreciation and impairment		(29,328	)		(32,287	)		(4,681	)

		23,027			23,973			3,476

Depreciation expense for the years ended December 31, 2020, 2021 and 2022, was RMB5.7 billion, RMB5.7 billion and RMB6.2 billion (US$905 million),

respectively

. Impairment charges on fixed assets for the years ended December 31, 2020, 2021 and 2022 were not material.