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REVENUES - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
REVENUES - Narrative (Details) - USD ($) $ in Millions	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025	Dec. 31, 2025	Nov. 30, 2024
Disaggregation of Revenue [Line Items]
Total deferred revenues	$ 1,981		$ 1,981		$ 2,343
Total revenues (Note 3)	1,658	$ 1,303	3,039	$ 2,543
Accounts receivable, net	370		370		555
Revenues recognized from contract liability balances	280	97	656	311
Volkswagen Group \| Principal Owner
Disaggregation of Revenue [Line Items]
Total deferred revenues	1,452		1,452		1,794
Total revenues (Note 3)	308	182	590	349
Accounts receivable, net					$ 328
Volkswagen Group \| License
Disaggregation of Revenue [Line Items]
Total deferred revenues						$ 1,295
Volkswagen Group \| Financial Milestone Payments
Disaggregation of Revenue [Line Items]
Total deferred revenues		$ 250		$ 250
Volkswagen Group \| Start of Production Milestone Payments
Disaggregation of Revenue [Line Items]
Total deferred revenues	$ 210		$ 210
Volkswagen Group \| Noncash Consideration
Disaggregation of Revenue [Line Items]
Total deferred revenues						$ 201
Chase Bank \| Revenue from Contract with Customer Benchmark \| Customer Concentration Risk
Disaggregation of Revenue [Line Items]
Concentration risk (as percent)	9.00%	45.00%	9.00%	40.00%