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BALANCE SHEETS COMPONENTS - Schedule of Property, Plant and Equipment, Net (Details) $ in Thousands, ر.س in Millions	6 Months Ended	12 Months Ended
	Jun. 30, 2026 USD ($)	Dec. 31, 2025 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2023 SAR (ر.س)
Property, Plant, and Equipment [Line Items]
Total Property, plant and equipment	$ 5,656,580	$ 5,200,462
Less accumulated depreciation and amortization	(1,433,739)	(1,222,330)
Property, plant and equipment, net	4,222,841	3,978,132
MISA \| Government Grant \| Related Party
Property, Plant, and Equipment [Line Items]
Related party transaction, amount of transaction			$ 97,500	ر.س 366
Land and land improvements
Property, Plant, and Equipment [Line Items]
Property, plant, and equipment	70,967	70,967
Building and improvements
Property, Plant, and Equipment [Line Items]
Property, plant, and equipment	1,102,446	1,099,186
Machinery, tooling and vehicles
Property, Plant, and Equipment [Line Items]
Property, plant, and equipment	2,393,770	2,363,263
Service Loaner Vehicles
Property, Plant, and Equipment [Line Items]
Property, plant, and equipment	28,400	47,200
Operating Lease Vehicles
Property, Plant, and Equipment [Line Items]
Property, plant, and equipment	32,800	33,700
Computer equipment and software
Property, Plant, and Equipment [Line Items]
Property, plant, and equipment	159,288	140,419
Leasehold improvements
Property, Plant, and Equipment [Line Items]
Property, plant, and equipment	306,925	304,609
Furniture and fixtures
Property, Plant, and Equipment [Line Items]
Property, plant, and equipment	60,309	57,921
Finance leases
Property, Plant, and Equipment [Line Items]
Finance leases	113,647	193,137
Construction in progress
Property, Plant, and Equipment [Line Items]
Property, plant, and equipment	1,449,228	970,960
AMP-2 Building Balance \| MISA \| Government Grant \| Related Party
Property, Plant, and Equipment [Line Items]
Related party transaction, amount of transaction	$ 127,500	$ 127,500