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PRESENTATION AND NATURE OF OPERATIONS (Details) $ / shares in Units, shares in Millions, $ in Millions		1 Months Ended		3 Months Ended
	Apr. 30, 2026 USD ($) $ / shares shares	Mar. 31, 2026 USD ($) milestone $ / shares shares	Nov. 30, 2024 USD ($)	Mar. 31, 2026 USD ($) segment milestone $ / shares
Debt Instrument [Line Items]
Number of reportable segments \| segment				2
Loan Agreements \| Term Loan
Debt Instrument [Line Items]
Aggregate principal amount			$ 1,000
Annual principal payment			100
Biannual installments			$ 50
Volkswagen Group \| Testing Milestone Payments \| Subsequent Event \| Related Party
Debt Instrument [Line Items]
Proceeds from stock-based compensation programs	$ 1,000
Volkswagen Group \| Testing Milestone Payments \| Common Class A \| Subsequent Event \| Related Party
Debt Instrument [Line Items]
Number of shares issued in transaction (in shares) \| shares	63
Price per share (in dollars per share) \| $ / shares	$ 15.90
Volkswagen Group \| Start of Production Milestone Payments
Debt Instrument [Line Items]
Receivable, contingent on milestone achievement		$ 460		$ 460
Volkswagen Group \| Start of Production Milestone Payments \| Common Class A
Debt Instrument [Line Items]
Capital shares reserved for future issuance				250
SMB Holding Corporation and Uber Technologies, Inc. \| Subscription and Circulation
Debt Instrument [Line Items]
Subscription agreement, amount, subject to satisfaction of closing conditions		$ 300		300
Shares issued upon satisfaction of closing conditions (in shares) \| shares		20
Maximum aggregate milestone payments		$ 950		$ 950
Remaining milestone payments, number \| milestone		4		4
Exercise price (in USD per share) \| $ / shares		$ 0.001		$ 0.001
SMB Holding Corporation and Uber Technologies, Inc. \| Subscription and Circulation \| Common Class A
Debt Instrument [Line Items]
Share price (in dollars per share) \| $ / shares		$ 15.34