Our property, plant and equipment, net, consisted of the following (in millions):


	March 31, 2025		December 31, 2024
Machinery, equipment, vehicles and office furniture	$	18,789	$	18,339
Land and buildings	10,914		10,677
AI infrastructure	5,420		5,152
Tooling	4,427		3,883
Leasehold improvements	3,883		3,688
Computer equipment, hardware and software	3,010		2,902
Construction in progress	7,313		6,783
	53,756		51,424
Less: Accumulated depreciation	(16,668)		(15,588)
Total	$	37,088	$	35,836

Construction in progress is primarily comprised of ongoing construction and expansion of our facilities, equipment and tooling related to the manufacturing of our products as well as AI-related assets which have not yet been placed in service.

Depreciation expense during the three months ended March 31, 2025 and 2024 was $1.15 billion and $929 million, respectively.