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RELATED PARTY TRANSACTIONS (Details) - USD ($) $ / shares in Units, $ in Millions		12 Months Ended
	Jun. 30, 2025	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Related Party Transaction [Line Items]
Stock issued		$ 745
Contract with customer, liability		2,343	$ 1,840
Revenues		5,387	4,970	$ 4,434
Accounts receivable, net		555	443
Volkswagen Group \| Financial Milestone Payments
Related Party Transaction [Line Items]
Contract with customer, liability	$ 250
Volkswagen Group \| Start of Production Milestone Payments
Related Party Transaction [Line Items]
Contract with customer, liability		$ 210
Volkswagen Group \| Start of Production Milestone Payments \| Common Class A
Related Party Transaction [Line Items]
Trading days		30 days
Principal Owner \| Volkswagen Group
Related Party Transaction [Line Items]
Contract with customer, liability		$ 1,794	1,526
Revenues		836	73
Accounts receivable, net		328	0
Principal Owner \| Volkswagen Group \| Financial Milestone Payments
Related Party Transaction [Line Items]
Proceeds from milestone achievement	$ 1,000
Shares issued (in shares)	51,502,854
Shares issued, price per share (in dollars per share)	$ 14.56
Contract with customer, liability	$ 250
Principal Owner \| Volkswagen Group \| Financial Milestone Payments \| Common Class A
Related Party Transaction [Line Items]
Stock issued	$ 750
Trading days	30 days
Shares issued (in shares)	52,000,000
Principal Owner \| Amazon
Related Party Transaction [Line Items]
Contract with customer, liability		365	135
Revenues		900	1,040	823
Accounts receivable, net		11	68
Principal Owner \| Amazon \| Hosting, Storage, and Compute Services Expense
Related Party Transaction [Line Items]
Expenses		$ 188	$ 94	$ 63