8. FIXED ASSETS


	As of December 31,
	2016			2017			2017
	RMB			RMB			US$
	(In millions)
Computer equipment		15,193			18,354			2,821
Office building		3,247			4,003			615
Office building related facility, machinery and equipment		1,772			1,956			301
Vehicles		45			80			12
Office equipment		546			690			106
Leasehold improvements		316			341			52
Construction in progress		755			680			105

		21,874			26,104			4,012
Accumulated depreciation and impairment		(10,580	)		(13,629	)		(2,095	)

		11,294			12,475			1,917

The Company obtained certain computer servers and equipment by entering into capital leases. The gross amount and the accumulated depreciation of these servers and equipment were RMB221 million and RMB210 million, respectively, as of December 31, 2016 and RMB198 million (US$30 million) and RMB198 million (US$30 million), respectively, as of December 31, 2017.

Depreciation expense of the fixed assets, including assets under capital leases, was RMB2.9 billion, RMB3.4 billion and RMB3.8 billion (US$580 million) for the years ended December 31, 2015, 2016 and 2017, respectively. The Company recognized impairment charges on fixed assets of nil, nil and RMB70 million (US$11 million) for the years ended December 31, 2015, 2016 and 2017, respectively.