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REVENUES - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
REVENUES - Narrative (Details) - USD ($) $ in Millions	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024	Dec. 31, 2024
Disaggregation of Revenue [Line Items]
Total contract liabilities	$ 2,243		$ 2,243		$ 1,840
Total revenues	1,303	$ 1,158	2,543	$ 2,362
Deferred revenues recognized from contract liability	97	6	311	72
Volkswagen Group
Disaggregation of Revenue [Line Items]
Total revenues	182	$ 0	349	$ 0
License \| Volkswagen Group
Disaggregation of Revenue [Line Items]
Total contract liabilities	1,295		1,295
Financial Milestone Payments \| Volkswagen Group
Disaggregation of Revenue [Line Items]
Total contract liabilities	250		250
Start of Production Milestone Payments \| Volkswagen Group
Disaggregation of Revenue [Line Items]
Total contract liabilities	210		210
Noncash Consideration \| Volkswagen Group
Disaggregation of Revenue [Line Items]
Total contract liabilities	$ 201		$ 201
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-07-01
Disaggregation of Revenue [Line Items]
Remaining performance obligation, expected timing of satisfaction, period (in years)	3 years		3 years
Chase Bank \| Revenue from Contract with Customer Benchmark \| Customer Concentration Risk
Disaggregation of Revenue [Line Items]
Concentration risk (as percent)	45.00%	54.00%	40.00%	38.00%