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Period Type:

PRESENTATION AND NATURE OF OPERATIONS (Details)		1 Months Ended		12 Months Ended
PRESENTATION AND NATURE OF OPERATIONS (Details)	Jun. 30, 2025 USD ($) $ / shares shares	Nov. 30, 2024 USD ($)	Jun. 30, 2024 USD ($)	Dec. 31, 2025 USD ($) segment	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)	Jun. 25, 2024 USD ($)
Debt Instrument [Line Items]
Number of reportable segments \| segment				2
Funding of interest		$ 92,000,000
Total deferred revenues				$ 2,343,000,000	$ 1,840,000,000
Stock issued				745,000,000
Proceeds from issuance of convertible notes				0	1,000,000,000	$ 3,195,000,000
Volkswagen Group \| Principal Owner
Debt Instrument [Line Items]
Total deferred revenues				1,794,000,000	$ 1,526,000,000
Volkswagen Group \| License
Debt Instrument [Line Items]
Total deferred revenues		1,295,000,000		1,295,000,000
Volkswagen Group \| Financial Milestone Payments
Debt Instrument [Line Items]
Total deferred revenues	$ 250,000,000
Volkswagen Group \| Financial Milestone Payments \| Principal Owner
Debt Instrument [Line Items]
Total deferred revenues	250,000,000
Proceeds from milestone achievement	$ 1,000,000,000
Capital stock issued to Volkswagen Group (in shares) \| shares	51,502,854
Shares issued, price per share (in dollars per share) \| $ / shares	$ 14.56
Volkswagen Group \| Testing Milestone Payments
Debt Instrument [Line Items]
Receivable, contingent on milestone achievement				1,000,000,000
Volkswagen Group \| Start of Production Milestone Payments
Debt Instrument [Line Items]
Total deferred revenues				210,000,000
Receivable, contingent on milestone achievement				460,000,000
Common Class A \| Volkswagen Group \| Financial Milestone Payments \| Principal Owner
Debt Instrument [Line Items]
Stock issued	$ 750,000,000
Capital stock issued to Volkswagen Group (in shares) \| shares	52,000,000
Trading days	30 days
Common Class A \| Volkswagen Group \| Testing Milestone Payments
Debt Instrument [Line Items]
Capital shares reserved for future issuance				$ 1,000,000,000
Trading days				30 days
Common Class A \| Volkswagen Group \| Start of Production Milestone Payments
Debt Instrument [Line Items]
Capital shares reserved for future issuance				$ 250,000,000
Trading days				30 days
Loan Agreements \| Term Loan
Debt Instrument [Line Items]
Aggregate principal amount		$ 1,000,000,000
2026 Convertible Note \| Convertible Debt
Debt Instrument [Line Items]
Aggregate principal amount							$ 1,000,000,000
Proceeds from issuance of convertible notes			$ 1,000,000,000