REVENUES - Narrative (Details) - USD ($)	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Dec. 31, 2024
Disaggregation of Revenue [Line Items]
Total contract liabilities	$ 1,899,000,000		$ 1,840,000,000
Total revenues (Note 3)	1,240,000,000	$ 1,204,000,000
Revenues recognized	214,000,000	66,000,000
Volkswagen Group
Disaggregation of Revenue [Line Items]
Total revenues (Note 3)	167,000,000	$ 0
License | Volkswagen Group
Disaggregation of Revenue [Line Items]
Total contract liabilities	1,295,000,000
Financial Milestone Payments | Volkswagen Group
Disaggregation of Revenue [Line Items]
Total contract liabilities	250,000,000
Start of Production Milestone Payments | Volkswagen Group
Disaggregation of Revenue [Line Items]
Total contract liabilities	210,000,000
Noncash Consideration | Volkswagen Group
Disaggregation of Revenue [Line Items]
Total contract liabilities	$ 201,000,000
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-04-01
Disaggregation of Revenue [Line Items]
Remaining performance obligation, expected timing of satisfaction, period (in years)	3 years
Chase Bank | Revenue from Contract with Customer Benchmark | Customer Concentration Risk
Disaggregation of Revenue [Line Items]
Concentration risk (as percent)	34.00%	23.00%